Culvert Design Report 10-31-2019.pdf

Yale-Kilgore Culvert Design Report

DJ&A, P.C.

3203 S. Russell St.

Missoula, MT 59801

December 30, 2019

Yale-Kilgore Culvert Design Project i

YALE-KILGORE CULVERT DESIGN REPORT

Yale-Kilgore Road Improvements Project Clark and Fremont County, Idaho

Prepared for:

Federal Highway Administration Western Federal Lands Highway Division 610 East Fifth Street Vancouver, WA 98661

Prepared by:

DJ&A, P.C.

3203 South Russell Street Missoula, Montana 59801

Project Number: 6839.002 Date: December 30, 2019 DRAFT ii

TABLE OF CONTENTS

1.0 Introduction

1.1 Project Background

1.2 Scope of Study and Objectives

1.3 Existing Culvert Data

2.0 Hydrologic Analysis

2.1 Drainage Basin Delineation

2.2 Design Flood Frequency

3.0 Hydraulics

3.1 HY-8 Analysis

4.0 Flood Plain Impacts

5.0 Recommendations

6.0 References

iii

List of Tables Table 1: Hydrologic Analysis Summary Table 2: Summary of HY-8 Inputs Parameters and HW/D Results Table 3: Live Stream Culvert Recommendations Table 4: Drainage and Irrigation Recommendations

List of Figures No table of figures entries found.

Appendices Attachment A Vicinity Map

Attachment B Existing Culvert Data Sheets

Attachment C StreamStats Reports

Attachment D HY-8 Results

Attachment E FEMA Floodplain Maps

Attachment F Culvert Summary Table iv

List of Acronyms ADT Average Daily Traffic

AOP Aquatic Organism Passage cfs cubic feet per second

CMP Corrugated Metal Pipe

FEMA Federal Emergency Management Agency

FIRM Flood Insurance Rating Map

FLH Federal Lands Highway

HDPE High Density Polyethylene

HW/D headwater to diameter

HY-8 HY-8 Culvert Hydraulic Analysis Program mph miles per hour

PDDM Project Development Design Manual

QA Quality Assurance

QC Quality Control

USGS United States Geological Survey

WFLHD Western Federal Lands Highway Division v

Document Version Control

Yale-Kilgore Culvert Design Report Yale-Kilgore Road Improvements Project Western Federal Lands Highway Division Fremont and Clark County, Idaho

Rev Date Author Checked Comments

A 9-30-2019 VJ MJ 30% Design Submittal B 12-30-2019 VJ MJ 30% Design Review Comments Incorporated

Author Signature: Vanessa Johnston, E.I.

QA/QC Reviewer Signature: Mike Jensen, P.E.

1.0 INTRODUCTION

This report presents the hydrologic and hydraulic analyses and culvert design recommendations for the Yale-Kilgore Road Improvements Project in Fremont and Clark County, Idaho (Attachment A) based on preliminary site visits. This study was prepared by DJ&A, P.C. (DJ&A) for Western Federal Lands Highway Division (WFLHD) as authorized by IDIQ Contract DTFH7015D00003L under Task Order 69056719F000067.

1.1 Project Background

The FHWA Design Scoping Report (November 2, 2018) recommended replacing three major culverts (greater than 48-inches in diameter) in conjunction with the Yale-Kilgore road widening and surface improvement project. In addition, the report noted many of the minor drainage structures were plugged or partially plugged, had some structural damage, or appeared to be non-functional based on change in drainage patterns.

1.2 Scope of Study and Objectives

The scope of study for this report includes the following:

• Conduct a field verification and inventory for all of the culverts.

• Identify road areas that potentially encroach into the river floodplain, require bank stabilization, or are inundated during the 50-year discharge.

• Determine stream crossings that require fish passage.

• Determine peak discharges and culvert capacity for major culverts.

• Determine if additional culverts are necessary for the new trail.

1.3 Existing Culvert Data

In May of 2019, DJ&A surveyors collected invert locations and elevations, and recorded culvert size and type for all major and minor culverts within the Yale-Kilgore Road project limits. In total 135 culvert road crossings were identified.

In July of 2019 a site visit was conducted by DJ&A engineers to visually observe and document the condition of all of the crossings, note deficiencies, and photograph each culvert. Deficiencies consisted of minor deformations or damage, flow restricted by debris, and corrosion of metal culverts.

The engineers also noted locations where the culverts appeared to be undersized. All of the data, photos, evaluations, and recommendations for each existing culvert are presented in Attachment B.

Of the 135 total culvert crossings, the engineers categorized 30 of them as major culvert crossings.

These were culverts that were greater than or equal to 48-inches in diameter, or single crossings with multiple culverts carrying perennial streams. The remaining pipes were classified as minor culverts, and predominately consisted of culverts conveying seasonal runoff from small draws through the road fill. Both the major and minor culvert categories included five culverts carrying irrigation ditch flow.

Hydrologic analyses were completed for all major culverts. Minor culverts that were identified for replacement will be replaced in-kind or upsized to the minimum 24-inch diameter.

1.4 New Trail Drainage Design

The design intent for the trail is to allow runoff to sheet flow over the trail surface and no ditches and relief culverts are planned for this work. The trail design will include a trail bridge across a wetland at trail station 13+30, and an AOP crossing over West Fork Creek at trail station 4+30. The AOP Crossing is the only active channel crossed by the trail and this design will be addressed with a separate document.

2.0 HYDROLOGIC ANALYSIS

2.1 Drainage Basin Delineation

Drainage basins were delineated using the United States Geological Survey (USGS) application StreamStats™ (Attachment C). No new culverts will be added in the process of the Yale-Kilgore Road improvements so all drainage basins are delineated from existing culverts. While a few culverts may be extended as part of the road improvements, the impact of the extensions on the hydrology and basin delineation is minor. No adjustments were made to the delineations based on culvert extensions or improvements.

2.2 Design Flood Frequency

According to the Federal Lands Highway (FLH) Project Development and Design Manual (PDDM), low standard roadways are classified as any road that has a design speed less than 45 miles per hour (mph), average daily traffic (ADT) less than 1,500, and is not designated as a critical access road. For this project, the design speed and design ADT for year 2035 are 45 mph and 1,000, respectively (WFL, 2019). Therefore, this roadway classifies as a high-standard road. Culverts crossing high-standard roads are designed using a 50-year return interval peak flow rate (Q50; FLH, 2018) while road-side culverts are designed using a 10-year return interval peak flow rate (Q10; FLH 2018).

None of the culverts being analyzed for flow capacity in this section are ditch relief or approach road crossing culverts so Q50 was used for design for all culverts. Table 1 below summarizes the drainage basin areas and Design flow for each major culvert.

Table 1: Hydrologic Analysis Summary

Culvert ID Stationing

Drainage Area (mi2)

Design Flow

(Q50, cfs) Name of Creek Notes 19602 31+43.0 0.20 14.6 Unnamed

18603 A&B 35+34.1 0.26 17.2 Unnamed 18614 88+03.5 0.90 40.9 Unnamed 18616 99+22.1 0.70 35.5 Unnamed 18623 119+45.6 0.37 22.2 Unnamed

18633 175+81.4 0.74 43.8 Unnamed Two StreamStats reports. Two drainage areas and two flows added together.

18640 A&B 239+16.2 Unknown Unknown Sheridan Creek Irrigation ditch on Sheridan Creek with control structure upgradient of

Yale-Kilgore road.

18692 257+52.3 0.8 38.2 Unnamed 18698 292+62.3 7.22 351.0 Taylor Creek

186108 A&B 399+91.0 4.61 283.0 Schneider Creek

Irrigation ditch with concrete headwalls; multiple diversion on flows on south side of crossing.

186110 430+12.6 2.55 137.0 Keg Springs Creek 186111 437+61.7 0.42 30.4 Unnamed 186112 448+46.6 1.21 62.9 Blind Creek 186114 486+16.7 3.77 196.0 Myers Creek 186115 A&B 499+29.3 9.30 480.0 Willow Creek

186123 554+38.5 0.72 56.7 Icehouse Creek Icehouse Creek splits into two main drainages. 168623 is one drainage. The second divides again. One is 186124 while the other is distributed between 2 culverts (186125 and 186126).

186124 559+80.1 0.30 28.7 Icehouse Creek 186125 565+03.7 0.05 7.7 Icehouse Creek

186126 565+57.9 0.25 24.3 Icehouse Creek

186129 599+23.6 0.09 12.6 Unnamed 186131 A&B 611+11.8 1.20 86.4 Kick Creek

186136 627+57.7 0.04 7.14 Unnamed 16141 718+84.3 5.0 283 Dry Creek

18678 A&B 800+34.1 4.01 307.0 Blue Creek 18669 885+26.8 9.18 461.0 Hotel Creek

18666 A&B 898+57.3 0.10 25.4 Unnamed Two StreamStats reports. Two drainage areas and two flows added together.

18661

A,B,&C 910+91.3 5.36 396.0 Yale Creek

18657 929+33.3 0.25 22.0 Unnamed 18656 940+51.2 0.66 43.4 West Fork Creek 18654 949+42.8 0.86 54.2 Mill Creek

Notes:

cfs – cubic feet per second Mi2 – square miles

From station 554+39 to 565+58, flow from Icehouse Creek is split into four distinct crossing locations as it intersects with the Yale-Kilgore Road. Initially, flow is divided into two different draws just above the road. One of these draws flows entirely into the culvert 186123 (station 554+39), the second draw splits again and is carried through the road fill through culverts 186124 (station 559+80), 86125 (station 565+04) and 186126 (station 565+58). For the purposes of this analysis one-half of the split flow was assumed to flow through the culvert 186124 (station 559+80) and the other half through culverts 186125 and 186126 at stations 565+04 and 565+58, respectively.

Culvert 18633, located at station 175+81, and culvert 18666, located at station 898+57, were delineated in StreamStats and additional satellite imagery was used to determine that two distinct draws appeared to drain through each culvert. For these culverts, two StreamStats flows (one for each draw) were added together in order to obtain the design flow for each culvert.

For culvert 18666, located at station 898+57, and 186112, located at station 448+47, the input precipitation values in StreamStats were not internally calculated by the program. For these culverts, precipitation values were estimated by averaging the precipitation values of neighboring drainage basins.

3.0 HYDRAULICS

HY-8 Culvert Hydraulic Analysis Program (HY-8) was used to analyze the flow conditions for each major culvert based on the design flow rate (Q50), culvert size, type, slope, and roadway information.

A summary of HY-8 inputs parameters are presented in Table 2. Results of the HY-8 hydraulics analysis are included in Attachment D. Although Yale-Kilgore Road improvements may require culvert elongation to extend past the new toe of fill, this analysis was completed based on existing lengths. For those culverts experiencing outlet control, a sensitivity analysis was performed to determine whether adding additional length decreased the outlet control depth. Results concluded that adding additional pipe length did not change the outlet control depth and only minor decreases in the headwater elevations, therefore, the existing pipe lengths were used in the hydraulic assessment.

Table 2: Summary of HY-8 Inputs Parameters and HW/D Results

Culvert ID No. Station Type

Diameter (in)3

Slope

Est.

Length (feet)

Inlet Configuration

HW/D

Ratio

18602 31+43.0 CMP 28x203 0.9 62 Thin Edge Projecting 1.46 18603 A&B1 35+34.1 CMP 24 1.1 62 Thin Edge Projecting 0.89

18614 88+03.5 CMP 49x333 3.2 55 Thin Edge Projecting 1.32 18616 99+22.1 CMP 49x333 1.3 56 Thin Edge Projecting 0.91 18623 119+45.6 CMP 49x333 0.1 65 Thin Edge Projecting 1.07 18633 175+81.4 CMP 24x183 2.7 47 Thin Edge Projecting 3.25

18640 A&B1 239+16.2 CMP 36 2.0 50 Thin Edge Projecting - 18692 257+52.3 CMP 36 1.8 61 Thin Edge Projecting 1.17 18698 292+62.3 CMP 36 2.6 72 Thin Edge Projecting 2.25

186108 A&B1 399+91.0 CMP 48 2.0 50 Thin Edge Projecting 1.60 186110 430+12.6 CMP 48 1.2 53 Thin Edge Projecting 1.95 186111 437+61.7 CMP 18 0.4 58 Thin Edge Projecting 4.31 186112 448+46.6 CMP 71x473 0.4 85 Thin Edge Projecting 0.79 186114 486+16.7 CMP 117x793 1.5 70 Thin Edge Projecting 0.66

186115 A&B1 499+29.3 CMP 72 8.4 63 Thin Edge Projecting 1.26 186123 554+38.5 CMP 60 1.8 56 Thin Edge Projecting 0.64 186124 559+80.1 CMP 36 1.5 64 Thin Edge Projecting 0.94 186125 565+03.7 CMP 18 2.8 53 Thin Edge Projecting 4.45 186126 565+57.9 CMP 24 2.4 69 Thin Edge Projecting 3.06 186129 599+23.6 CMP 36 4.1 71 Thin Edge Projecting 0.55

186131 A&B1 611+11.8 CMP 24 2.8 56 Thin Edge Projecting 2.94 186136 627+57.7 CMP 18 2.5 67 Thin Edge Projecting 1.23 186141 718+84.3 CMP 55X36 3.2 84 Thin Edge Projecting 2.01

18678 A&B1 800+34.1 CMP 57x383 7.7 65 Thin Edge Projecting 2.49 18669 885+26.8 CMP 96 0.4 73 Thin Edge Projecting 1.20

18666 A&B1 898+57.3 CMP 30 0.5 72 Thin Edge Projecting 0.74 18661

A,B,&C2 910+91.3 CMP 30 2.5 67 Thin Edge Projecting 2.85

18657 929+33.3 CMP 66 0.1 68 Thin Edge Projecting 0.39 18656 940+51.2 CMP 48 1.2 59 Thin Edge Projecting 0.76 18654 949+42.8 CMP 18 0.2 65 Thin Edge Projecting 11.6

Notes:

1 – Dual Culverts 2 – Triple Culverts 3 – Culvert size used for modeling analysis. Arched pipe sizes are noted as span x rise.

CMP – corrugated metal pipe in – inches HW/D – headwater to diameter Highlighted orange – indicates culverts in need of replacement by inspection during the site visit.

Highlighted grey – indicates inadequate hydraulic capacity above the required headwater to diameter ratio in need of replacement.

3.1 HY-8 Analysis

Culvert capacity was estimated for existing conditions and checked to ensure that each crossing had headwater to diameter (HW/D) ratios less than 1.5 for culverts with a diameter of 48-inches and smaller and 1.2 for those larger than 48-inches. All culverts that exceeded this limit were resized until the HW/D ratio was below the required ratio. Recommended culvert sizes are based on the minimum waterway area required to meet the HW/D limitations and are not necessarily sized for minimum cover requirements or related site-specific constraints. The culvert analysis confirms field observations that many of the existing crossings are undersized for seasonal flows, however, with the exception of the Sheridan Creek crossing at station 239+16.2, Taylor Creek crossing at station 292+62.3 and Schneider Creek crossing at station 399+91.0, there were no indications that these undersized crossings are a maintenance issue or have negatively impacted the road embankment.

The Sheridan Creek crossing (18640 A&B) was identified as an irrigation ditch. Approximately 550 feet upgradient of the crossing, flow is diverted from Sheridan Creek by a concrete irrigation structure. This diverted flow crosses Yale-Kilgore road (station 239+16.2) through two 36-inch culverts where it eventually discharges into Sheridan Reservoir south of the road. The remaining natural drainage flow from Sheridan Creek crosses beneath Yale-Kilgore road via a wood bridge approximately 220 feet east of the culverts. Without additional data on the diversion structure, a hydrologic/hydraulic analysis could not have performed on these culverts. Both culverts are in good condition with no evidence of erosion or overtopping; therefore, it is recommended that these culverts remain as is.

The Taylor Creek crossing was identified as a maintenance issue during a field review with the County Road Manager. The United States Forest Services (USFS) recommended culvert replacing this crossing with an Aquatics Organism Passage (AOP) due to fish passage. A separate AOP design document will be prepared for this crossing. There were no other crossings that were identified by either county as being a maintenance issue.

The Schneider Creek crossing (186108 A&B) was identified as an irrigation ditch located at station 399+91. The inlet consists of two 48-inch diameter culverts with thin edge projection consisting of a 4.6-acre drainage area and a 50-year flow event of 283 cfs. The outlet has a concrete headwall that diverts flow into three different concrete channel structures. Even though the HW/D ratio is above 1.5, it is recommended these culverts remain as is, due to the infrastructure in place at this location and cost of replacement. The existing cover is less than 6-inches in depth and insufficient. Along with additional cover, it is recommended that the inlet be cleaned out from debris.

A new AOP culvert will be designed for the trail crossing over West Fork Creek at trail station 4+30.

It is also recommended that the highway culvert just upstream from the trail location on West Fork Creek be replaced with an AOP as well (highway station 940+51). The existing culvert does not have the minimum required cover and is too short. The AOP Crossings will be addressed with a separate design document.

As a note, some of the culvert dimensions obtained from field measurements were modified to match standard arch culvert sizes available in the HY-8 program. Culvert sizes were rounded down (smaller) in order to model these crossings.

4.0 FLOOD PLAIN IMPACTS

There are numerous locations throughout the length of the project where the Yale-Kilgore Road crosses and divides wetland areas. These locations are identified in the Wetland Delineation Report prepared by Turnstone Environmental, August 15, 2019. During Spring runoff isolated shallow pools and some minor ponding was observed on the upstream side of the road embankment at many of these locations. However, these areas are heavily vegetated and there were no signs that this seasonal ponding has had any negative impacts on the road embankment. There are no areas along the project route that have been identified as requiring embankment protection or other permanent erosion control features.

Yale-Kilgore Road Improvements are taking place within Zone X and Zone A of the Federal Emergency Management Agency (FEMA) flood insurance rating map (FIRM). Attachment E presents the FIRM for the Yale-Kilgore Road improvements project, showing which parts of the project are in each zone. The majority of the project is determined to be an area of minimal flood concern (Zone X) while a few stretches of road are within the 100-year flood plain (Zone A). Although parts of the project are within the floodplain, road improvements will not alter the floodplain.

5.0 RECOMMENDATIONS

Based on the hydrologic and hydraulic analysis, Tables 3 and 4 summarizes the information and recommended actions for each culvert along Yale-Kilgore Road. Table 3 summarizes the culverts designated as major culverts. Culverts recommended to be removed and replaced are experiencing either erosion or corrosion, or do not have sufficient capacity to carry flow from a 50-year storm event. A handful of culverts are in adequate condition and of sufficient size but need minor repair or cleaning to either remove debris from the inlet or outlet, or to slightly re-shape one of the openings that have been bent or deformed.

Table 3: Major Culvert Recommendations

Culvert ID No.

Name of Creek Station

Existing Size (in.)

Recommended Design Size Comment

18602 Unnamed 31+43.0 30x18 Leave 18603 A&B Unnamed 35+34.1 24 Repair1

18614 Unnamed 88+03.5 48x36 Leave 18616 Unnamed 99+22.1 48x36 Repair1 18623 Unnamed 119+45.6 48x36 Leave 18633 Unnamed 175+81.4 18 48” x 33” Remove & Replace

18640 A&B Sheridan Creek 239+16.2 2 - 36 Leave 18692 Unnamed 257+52.3 36 Leave 18698 Taylor Creek 292+62.3 36 AOP Remove & Replace

186108 A&B Schneider Creek 399+91.0 2 - 48 Leave

186110 Keg Springs Creek 430+12.6 48 60” Remove & Replace

186111 Unnamed 437+61.7 18 36” Remove & Replace 186112 Blind Creek 448+46.6 72x42 Leave 186114 Myers Creek 486+16.7 120x84 Leave

186115 A&B Willow Creek 499+29.3 72 87” x 63” Remove & Replace 186123 Icehouse Creek 554+38.5 60 Leave 186124 Icehouse Creek 559+80.1 36 Repair1 186125 Icehouse Creek 565+03.7 18 Leave 186126 Icehouse Creek 565+57.9 24 36” Remove & Replace 186129 Unnamed 599+23.6 36 Repair1

186131 A&B Kick Creek 611+11.8 24 48” Remove & Replace 186136 Unnamed 627+57.7 18 24” Remove & Replace 186141 Dry Creek 718+84.3 55X36 77” x 52” Remove & Replace

18678 A&B Blue Creek 800+34.1 60x40 87” x 63” Remove & Replace2 18669 Hotel Creek 885+26.8 96 Leave

18666 A&B Unnamed 898+57.3 30 36” Remove & Replace 18661

A,B,&C Yale Creek 910+91.3 30 Leave

18657 Unnamed 929+33.3 66 Leave 18656 West Fork Creek 940+51.2 48 AOP Remove & Replace

- West Fork Creek Trail 4+30 NA AOP Install New

18654 Mill Creek 949+42.8 18 42” Remove & Replace Notes:

1. Repairs necessary are cleanout and debris removal at inlets.

2. Finished grade elevation will need to be raised an additional 2 feet for storage.

3. Highlighted orange – see recommendation note

A field review of the existing culverts were conducted in October of 2019 with Western Federal Lands Project Manager, DJ&A Engineers and both Fremont and Clark Counties. The culverts highlighted orange in Table 3 above, were determined to be in sufficient condition and use therefore not to be replaced during construction to save on project costs.

Table 4 summaries the recommendations for the remaining culverts categorized as drainage or irrigation.

Table 4: Minor Culverts Recommendations

Culvert ID No.

Station (feet)

Size (in.) Material

Design Size (in) Recommendations

18601 17+59.0 30X18 CMP 30X18 Remove & Replace; deterioration 18605 41+27.2 24 CMP Leave 18606 46+15.8 24 CMP Leave 18607 47+68.1 18 CMP 24 Remove & Replace; minimum size 18608 52+98.1 18 CMP 24 Remove & Replace; minimum size 18609 59+06.6 18 CMP 24 Remove & Replace; minimum size 18610 62+96.5 18 CMP 24 Remove & Replace; deformed inlet 18611 71+11.3 24 CMP 24 Remove & Replace; deterioration 18612 74+00.5 48X30 CMP Leave 18613 81+91.5 18 CMP 24 Remove & Replace; minimum size 18615 90+33.1 24 CMP 24 Remove & Replace; deterioration 18617 104+89.3 24 CMP Leave 18618 107+56.5 24 CMP 24 Remove & Replace; deformed inlet 18619 109+97.7 18 CMP 24 Remove & Replace; minimum size 18620 111+88.9 18 CMP 24 Remove & Replace; deterioration 18621 112+39.1 18 CMP 24 Remove & Replace; minimum size 18622 113+72.1 18 CMP 24 Remove & Replace; minimum size 18624 121+60.5 18 CMP 24 Remove & Replace; minimum size 18625 130+53.5 18 CMP 24 Remove & Replace; minimum size 18626 134+10.5 18 CMP 24 Remove & Replace; minimum size 18627 139+48.0 18 CMP 24 Remove & Replace; minimum size 18628 151+83.4 18 CMP 24 Remove & Replace; minimum size 18629 148+78.8 18 CMP 24 Remove & Replace; poor condition 18630 153+34.5 18 CMP 24 Remove & Replace; minimum size 18631 155+86.6 18 CMP 24 Remove & Replace; minimum size 18637 160+84.5 18 CMP 24 Remove & Replace; minimum size 18632 169+86.3 18 CMP 24 Remove & Replace; minimum size 18634 179+15.0 N/A - 24 Remove & Replace 18635 182+85.5 24 CMP 24 Remove & Replace; deformed outlet 18636 196+79.3 24 CMP Leave 18638 218+73.0 18 CMP 24 Remove & Replace; minimum size 18686 222+78.7 18 CMP 24 Remove & Replace; inlet/outlet bent closed 18639 232+78.0 24 CMP 24 Remove & Replace; inlet bent closed 18687 244+43.6 30 CMP Leave 18688 245+45.6 18 CMP 24 Remove & Replace; minimum size 18689 248+98.3 30 CMP Leave 18690 250+90.8 24 CMP Leave 18691 256+38.5 36 CMP Leave 18693 259+16.8 24 CMP Leave 18694 264+56.9 18 CMP 24 Remove & Replace; crush inlet

18695 273+20.8 36 CMP Repair; Little deformation; inlet eroded; need inlet treatment

18696 277+43.7 18 CMP 24 Remove & Replace; deformed inlet 18697 288+43.8 36 CMP Leave 18699 301+93.0 18 CMP 24 Remove & Replace; minimum size 186100 307+93.9 24 CMP 24 Remove & Replace; deterioration 186101 317+84.7 18 CMP 24 Remove & Replace; minimum size 186102 332+85.6 18 CMP 24 Remove & Replace; minimum size

Culvert ID No.

Station (feet)

Size (in.) Material

Design Size (in) Recommendations

186103 339+90.0 18 CMP 24 Remove & Replace; minimum size 186104 344+85.2 18 CMP 24 Remove & Replace; minimum size 186105 373+67.5 24 CMP 24 Remove & Replace; culvert is buried 186106 373+96.3 30 CMP Leave 186107 378+75.6 18 CMP 24 Remove & Replace; poor condition 186109 406+83.8 18 CMP 24 Remove, Replace, & Relocate; poor condition 186113 471+26.8 18 CMP 24 Remove & Replace; minimum size

186117 509+42.8 24 CMP Repair; Clean, debris removal, outlet deformed, tree removal blocking pipe inlet

186118 518+82.9 18 CMP Repair; Tree removal blocking pipe inlet 186119 518+78.5 18 CMP Repair; Clean, debris removal 186120 522+00.9 18 CMP 18 Replace 8 feet at inlet

186121 531+86.0 18 CMP Utility line through pipe; Utility company to replace culvert

186122 548+48.9 30 CMP Utility line through pipe; Utility company to replace culvert

186127 581+87.6 18 CMP Repair; Clean, debris removal 186128 587+66.8 18 CMP Repair; Clean, debris removal 186130 600+87.7 12 CMP 24 Remove & Replace; minimum size

186133 616+69.2 18 CMP Utility line through pipe; Utility company to replace culvert

186134 618+53.5 24 CMP Repair; Clean / debris removal 186135 620+82.1 18 CMP Repair; Clean / debris removal 186137 629+37.0 18 CMP Leave 186138 639+24.2 18 CMP Leave 186139 660+37.1 14 CMP Leave 186140 672+47.5 18 CMP 24 Remove & Replace; poor condition 186142 726+71.1 18 CMP Repair; Clean / debris removal 186143 740+53.6 18 CMP Leave 18683 748+48.0 19X11 CMP Leave 18682 756+50.6 18 CMP Leave 18681 A&B 768+16.0 24 CMP Repair main pipe

18680 780+93.4 24 CMP Repair segment at outlet 18679 793+44.7 24 CMP Leave 18677 811+96.5 16 CMP 24 Remove & Replace; minimum size 18674 821+54.3 24 CMP Leave 18675 817+87.1 24 CMP Leave 18676 816+63.8 16 CMP Leave 18673 834+85.4 16 CMP Leave 18672 841+90.8 18 CMP Leave

18671 844+03.9 18 CMP Utility line through pipe; Utility company to replace culvert

18670 859+17.7 14 CMP Repair; Clean / debris removal 186201 881+80.0 18 CMP Leave 18668 888+72.5 18 HDPE 24 Remove & Replace with CMP 18665 903+86.9 18 CMP Repair; Clean / debris removal; culvert is buried 18664 909+93.8 18 CMP Leave 18660 914+44.8 24 CMP Leave 18658 926+13.7 12 CMP 24 Remove & Replace; minimum size

Culvert ID No.

Station (feet)

Size (in.) Material

Design Size (in) Recommendations

18659 925+00.0 18 CMP Repair; Clean / debris removal; culvert is buried 18655 950+41.3 24 CMP 24 Remove & Replace 18653 970+53.7 18 CMP Leave 18652 984+65.7 18 CMP Leave 18647 1013+52.7 18 CMP 24 Remove & Replace; poor condition 18648 1014+06.7 18 CMP 24 Remove & Replace; poor condition

18650 1010+80.8 18 HDPE 24 Remove & Replace with CMP; add additional cover

18651 1010+79.6 18 CMP 24 Remove & Replace; poor condition 18646 1019+44.5 18 CMP Repair; Clean, debris removal, outlet deformed 18649 1015+94.4 18 HDPE 24 Remove & Replace with CMP 18645 1075+39.2 30 CMP Leave 18643 1085+52.7 18 CMP Repair; Clean / debris removal 18644 1086+93.9 18 CMP 24 Remove & Replace; poor condition 18642 1128+71.8 18 CMP Repair; Clean, debris removal 18684 12 CMP Culvert is located outside project scope 18685 18 CMP Culvert is located outside project scope

6.0 REFERENCES

Department of Water Resources, Idaho. Floodplain Management, Idaho Flood Hazard Map.

Available online at <https://idwr.idaho.gov/floods/map.html>. Accessed September 2019.

Federal Highway Administration, 2016. HY-8 Culvert Analysis Program. Version 7.50, August 2019.

Scoping Report, 2018. Federal Highway Administration - Western Federal Lands Highway Division, DJ&A P.C.. July, 2018.

USGS, 2019. U.S. Geological Survey, StreamStats. Available online at <https://water.usgs.gov/osw/streamstats/index.html >. Accessed July 2019.

ATTACHMENTS

ATTACHMENT A: Vicinity Map

£¤20

1140+87.8110+00

± 0 1 2 3 4 5 Miles

Vicinity Map Yale-Kilgore Road Improvements

Clark/Fremont Counties, Idaho Project Alignment

Projection: NAD 1983 2011 State Plane Idaho East FIPS 1101 Ft US Basemap: ESRI and their providers

I D A H O

Area of Interest

CLARK COUNTY

FREMONT COUNTY

CL

AR

K

CO

UN

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FR

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ON

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CO

UN

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ATTACHMENT B: Existing Culvert Data Sheets

T 406.721.4320 F 406.549.6371 djanda.com

Vanessa Johnston

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z 763489 763496 1017120 6500.72

18x30 inches

CMP

1.87% 16 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Okay Remove & Replace

Treatment Riprap/Vegetation

Condition:

Recommendation:

Approximate Soil Cover:

Inspected by:

Date of inspection:

Approximate mileage:

Culvert ID:

Station No.:

(from furthest west culvert)

18601 17+59.0

Size:

Material:

Slope:

Use: Drainage

7/15/2019

Treatment Riprap

0.0

Y 1017175

Z 6501.75

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Some erosion of side bank. Lots of vegetation. Pipe bottom is covered in mud. Some corrosion and erosion on outlet. Culvert is located by road 033.

T 406.721.4320 F 406.549.6371 djanda.com

18601 Vanessa Johnston 17+59.0 7/15/2019

0.0 (from furthest west culvert)

Explanation & Comments:

Culvert ID:

Station No.:

Approx mileage:

Inspected by:

Date of Inspection:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Photo of culvert outlet. Corrosion of pipe at water level.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

764357.5 764370.1 1018188 6510.21

18x30 inches

CMP

0.90% 21 inches

Evaluation

(Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Culvert ID:

7/15/2019

0.2

Y Z Treatment Treatment

Vanessa Johnston Station No.:

Inspected by:

Size:

Material:

Slope:

18602 31+43.0

Approximate mileage:

Date of inspection:

Use:

Condition:

1018248 6510.76 Riprap

Perennial Stream

Approximate Soil Cover:

Good LeaveRecommendation:

Riprap

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

There are extra pieces of cmp pipe laying around. Slight corrosion at outlet (not pictured).

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z 764696 764734 1018356 6506.57

24 inches (diameter) 1.13% CMP 60 inches

X X Y Z

764698.2 764736 1018358 6506.33

24 inches (diameter) 1.69% CMP 60 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

18603 A & B

Size:

Material

Slope:

Slope:

Approximate Soil Cover:

Approximate Soil Cover:

Station No.:

Approximate mileage: 0.4

Y Z A

B

1018405 6507.27 Riprap

Treatment Riprap

Good

Material:

Z Treatment

Repair

7/15/2019 Culvert ID:

35+34.1

6507.36

Size:

Treatment Riprap

Vanessa Johnston

Riprap

Use:

Condition:

Recommendation:

1018406

Inspected by:

Date of inspection:

Treatment

Perennial Stream

Y

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Two 24-inch culverts here. Both are in good condition. There is some corrosion where water has sat. The east culvert (picture left) outlet has minor deformations, but still functioning.

T 406.721.4320 F 406.549.6371 djanda.com

18603 A & B Vanessa Johnston 35+34.1 7/15/2019

0.4 (from furthest west culvert)

Explanation & Comments:

Inspected by:

Date of Inspection:

Culvert ID:

Station No.:

Approximate mileage:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

Photo of culvert outlet. East pipe (picture right) is crushed.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

765298.2 765295.8 1018509 6508.49

24 inches (diameter)

CMP

0.02% 24 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Z Treatment Treatment 1018462 6508.5

Condition:

Size:

Material:

Slope:

Approximate Soil Cover:

Recommendation:

Riprap Riprap

0.4Approximate mileage:

Station No.:

Inspected by:

Date of inspection:

18605 41+27.2

Vanessa Johnston

Leave Good

Use:

7/15/2019 Culvert ID:

Y

Drainage

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Inlet (pictured) ends are bent in\dinged up. The culvert has been used for drainage, probably not recently. Reminants of wider flow than streambed can be seen. Cuvlert located by the only tree in field.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

765763.4 765793.9 1018550 6503.41

24 inches (diameter)

CMP

1.14% 41 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Condition:

Recommendation: Leave

Drainage Good

Culvert ID:

Station No.:

18606

Approximate mileage:

Treatment 1018596 6504.04 Riprap

Treatment

Size:

Material:

Slope:

Approximate Soil Cover:

Use:

Riprap

Inspected by:

Date of inspection:46+15.8

Vanessa Johnston 7/15/2019

0.5

Y Z

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

There is no water present but there is a ponding area at inlet. Purposeful drop in at outlet.

Place for ponding at outlet.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

765905.2 765945 1018585 6504.21

18 inches (diameter)

CMP

1.09% 23 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Recommendation:

Z Riprap

18607 47+68.1

Vanessa Johnston

1018623 6504.81 Soil/Some Riprap

Slope:

Approximate Soil Cover:

Treatment

Condition:

7/15/2019Station No.:

Inspected by:

Date of inspection:

Treatment

Drainage Good

Use:

Size:

Culvert ID:

Approximate mileage:

Remove & Replace

0.5

Y

Material:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Debris and sediment and tree limbs need cleaned out of inlet. Lots of soil, not much riprap.

Riprap oulet. Some undercutting is taking place at outlet. This stream bed was et this year.

May need more rip rap to keepfrom undercutting. Pipe is clear all the way through. Located just west of Road 327(East Dry Creek)

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

766452.5 766446.2 1018715 6500.69

18 inches (diameter)

CMP

0.32% 20 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Drainage Poor

1018675 6500.82

Size:

Material:

Date of inspection:

Slope:

Approximate Soil Cover:

Treatment Treatment Vegetation Vegetation

7/15/2019 0.6

Use:

Condition:

Recommendation:

Culvert ID:

Station No.:

Approximate mileage:

Vanessa Johnston

Remove & Replace

Inspected by:

Z

18608 52+98.1

Y

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Culvert is buried in dirt. Ends have been dug out for surveying purposes. Remove or abandon this culvert.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

767033.5 767052 1018827 6495.64

18 inches (diameter)

CMP

0.63% 10 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Y Z Treatment

59+06.6 Date of inspection:

Drainage

Treatment 1018823 6495.76 Soil/Vegetation Soil/Vegetation

Vanessa Johnston

Material:

Slope:

Size:

7/15/2019

Approximate Soil Cover:

Inspected by:Culvert ID:

Station No.:

Approximate mileage:

18609

Recommendation:

PoorCondition:

0.7

Remove & Replace

Use:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

Culvert runs parallel to Yale Kilgore Road. Culvert is buried. Remove or abandon.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

767405.2 767459.5 1018853 6488.25

18 inches (diameter)

CMP

1.57% 12 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Vegetation

18610 62+96.5

Vanessa JohnstonInspected by:

Date of inspection:

Remove & Replace

1018891 Vegetation

Drainage Good

7/15/2019 0.8

Y Z Treatment Treatment 6489.29

Size:

Material:

Slope:

Approximate Soil Cover:

Recommendation:

Use:

Culvert ID:

Station No.:

Condition:

Approximate mileage:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Inlet edges (pictured) are bent. Culvert is located in a wetland flat spot, but appears that it is not being used. Outlet is in good conition.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

768201.5 768262.2 1018994 6482.65

24 inches (diameter)

CMP

0.74% 48 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Z Treatment Treatment 1019043 6483.23 Vegetation Vegetation

Date of inspection:

Drainage Okay

Vanessa JohnstonInspected by:18611 7/15/2019

1.0

Y

71+11.3

Remove & Replace

Size:

Use:

Condition:

Material:

Slope:

Approximate Soil Cover:

Culvert ID:

Station No.:

Approximate mileage:

Recommendation:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

Erosion is present as little holes. Culvert is clear all the way through pipe.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

768491.4 768545.6 1019039 6480.58

30x48 inches

CMP

1.08% 72 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

7/15/2019 1.0

Approximate Soil Cover:

Y Z Treatment Treatment 1019097 6481.44 Vegetation Vegetation

LeaveRecommendation:

Slope:

Size:

Material:

Inspected by:

Date of inspection:

Vanessa Johnston

Use:

Condition:

18612 74+00.5

Approximate mileage:

Culvert ID:

Station No.:

Drainage Good

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

Culvert is in excellent condition.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

769298.4 769293.5 1019164 6481.01

18 inches (diameter)

CMP

14.02% 40 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Condition:

Recommendation:

7/15/2019

1019232 6490.57 Vegetation Vegetation

Drainage Good

Treatment

18613 81+91.5

Vanessa JohnstonInspected by:

Date of inspection:

1.2

Treatment

Culvert ID:

Station No.:

Approximate mileage:

Remove & Replace

Approximate Soil Cover:

Size:

Material:

Slope:

Y Z

Use:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

There is sediment build up at inlet. Culvert outlet is on a hillside. Culvert is set at a very steep grade. Some damage has occured at outlet. Woody debris buildup above outlet. Can not see light through culvert. Possible that there is an elbow or bend in pipe.

T 406.721.4320 F 406.549.6371 djanda.com

18613 Vanessa Johnston 81+91.5 7/15/2019

1.2 (from furthest west culvert)

Explanation & Comments:

Inspected by:

Date of inspection:

Culvert ID:

Station No.:

Approximate mileage:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Sluffing on south side of road, just west of the culvert. Erosion cut up to two feet deep.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z 769881 769902.4 1019326 6484.38

36x48 inches

CMP

3.20% 60 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

1019376 6486.12 Vegetation Vegetation

1.3

Condition:

Vanessa Johnston 7/15/2019

Leave

Material:

Slope:

Approximate Soil Cover:

Treatment

Perennial Stream Good

18614 88+03.5Station No.:

Approximate mileage:

Culvert ID:

Z TreatmentY

Recommendation:

Use:

Size:

Inspected by:

Date of inspection:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Culvert is located by an abandoned cabin/homestead. There is some sluffing erosion on downhill (south) side (not pictured). At time of site visit, there is 0.5 inches of water flowing through culvert. There is some undercutting on outlet side.

T 406.721.4320 F 406.549.6371 djanda.com

18614 Vanessa Johnston 88+03.5 7/15/2019

1.3 (from furthest west culvert)

Explanation & Comments:

Inspected by:

Date of inspection:

Culvert ID:

Station No.:

Approximate mileage:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

The 3-inch pipe running through culvert is dry.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z 770137 770093.3 1019439 6480.25

24 inches (diameter)

CMP

0.95% 72+ inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Remove & ReplaceRecommendation:

18615 90+33.1

Vanessa Johnston

1019381 6480.94 Riprap Riprap

7/15/2019 1.3

Y Z Treatment Treatment

Culvert ID:

Use:

Condition:

Material:

Size:

Poor

Approximate mileage:

Slope:

Drainage

Approximate Soil Cover:

Station No.:

Inspected by:

Date of inspection:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

There is a cabin access road east of culvert with a tree on north side of road. Groud is wet and soggy upstream. Culvert is not draining. Sitting water, ground is wet. There is significant erosion. The exposed parts of the pipe are in poor condition at inlet (pictured). Culvert is at least halfway filled withsediment. Culvert needs to be cleaned, if not removed and replaced.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

770969.2 770967.4 1019685 6478.58

36x48 inches

CMP

1.34% 60+ inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

18616

Y Z Treatment Treatment 1019630 6479.32 Vegetation Vegetation

Culvert ID:

7/15/2019

1.5 99+22.1

Repair

Perennial Stream Good

Station No.:

Approximate mileage:

Approximate Soil Cover:

Use:

Condition:

Recommendation:

Size:

Material:

Slope:

Inspected by:

Date of inspection:

Vanessa Johnston

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

There is an additional culvert section laying around on the north side of road here. Culvert is full of moss and sediment with almost stationary water. The north side (pictured) contains 1 ft of sediment, while the south side contains 6 inches of sediment. Culvert needs cleaned and maintained.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

771503.4 771526.2 1019783 6471.54

24 inches (diameter)

CMP

2.76% 36 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Drainage Good

Slope:

Approximate Soil Cover:

Use:

Condition:

Recommendation: Leave

Z Treatment

Culvert ID:

Treatment 1019828 6472.93 Vegetation Vegetation

Size:

Material:

Station No.:

Approximate mileage:

Y

1.6

18617 Date of inspection: 7/15/2019104+89.3

Inspected by: Vanessa Johnston

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

There is undercutting on north side (pictured). The north end of the culvert is bent.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

771773.2 771770.8 1019903 6472.52

24 inches (diameter)

CMP

0.40% 24 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

7/15/2019 1.7

Y Z Treatment 1019853 6472.72 Vegetation Vegetation

Drainage Poor

Slope:

Approximate Soil Cover:

Station No.:

Treatment

107+56.5 Inspected by:

Date of inspection:

Approximate mileage:

Culvert ID: 18618 Vanessa Johnston

Use:

Size:

Material:

Condition:

Recommendation: Remove & Replace

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

The inlet (pictured) is deformed and needs replaced. There is very heavy vegetation at outlet.

Culvert does not appear to be active.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

772008.3 772000.1 1019963 6470.63

18 inches (diameter)

CMP

0.49% 18 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Use:

Condition:

Recommendation:

Material:

Slope:

Approximate Soil Cover:

Poor Remove & Replace

7/15/2019 Approximate mileage:

Culvert ID:

Station No.:

1019923 6470.83 Vegetation/Soil Vegetation/Soil

Vanessa JohnstonInspected by:

Date of inspection:

Y Z Treatment Treatment

Size:

1.7

18619 109+97.7

Drainage

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

Culvert is completely filled with sediment and buried. Ends were dug out for assessment.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

772194.9 772182.3 1020018 6468.6

18 inches (diameter)

CMP

0.06% 36 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Size:

Material:

Slope:

Approximate Soil Cover:

18620 111+88.9

Vanessa JohnstonInspected by:

Date of inspection:

Drainage Poor

Remove & Replace

1.8

Y Z Treatment Treatment

Culvert ID:

Station No.:

Vegetation Vegetation

7/15/2019

1019969 6468.63

Approximate mileage:

Use:

Condition:

Recommendation:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Culvert is deteriorating,. There are 6 inches of sediment in south end of culvert. Vegetation has engulfed inlet and outlet.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

772215.9 772259.7 1019987 6467.72

18 inches (diameter)

CMP

1.28% 48 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

1020027 6468.48 Vegetation Vegetation Treatment Treatment

112+39.1 Vanessa JohnstonInspected by:

Drainage Good

Remove & Replace

Date of inspection:

Approximate Soil Cover:

7/15/2019 1.8

18621

Approximate mileage:

Culvert ID:

Station No.:

Slope:

Y Z

Size:

Material:

Use:

Condition:

Recommendation:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Culvert is super heavily vegetated at inlet and outlet. There is no standing water. There are some deformed edges on northside (pictured).

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

772338.7 772390.7 1020025 6469.07

18 inches (diameter)

CMP

0.33% 36 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Drainage Good

1020063 6469.28 Vegetation Vegetation

18622 113+72.1

Vanessa JohnstonInspected by:

Date of inspection:

Size:

Material:

7/15/2019 1.8

Y Z Treatment Treatment

Culvert ID:

Condition:

Recommendation:

Slope:

Approximate Soil Cover:

Remove & Replace

Station No.:

Approximate mileage:

Use:

WFLHD

Yale Kilgore Road Improvements

ID CLARK 6805(1) Yale Kilgore Road MP 9 to 16.9 ID FREEMONT 6805(1) Yale Kilgore Road MP 16.9 to 30.8

Contract No. DTFH7015D00003. Task Order No.

69056719F000067

Lots of vegetation surrounding culvert. There is standing water with in a defined channel.

South end of culvert has 4 inches of sediment. Surrouding area is a wetland-type area. Culvert needs cleaned and cleared.

T 406.721.4320 F 406.549.6371 djanda.com

(from furthest west culvert)

Existing Culvert Data Inlet Invert Outlet Invert

X X Y Z

772947.3 772894 1020214 6475.89

36x48 inches

CMP

0.05% 24 inches

Evaluation (Drainage, Irrigation, Perennial Stream) (Poor, Fair, Good) (Leave, Abandon, Repair, Remove & Replace)

Explanation & Comments:

Inspected by:

Date of inspection:

6475.92 Riprap Riprap

Perennial Stream Good

Size:

Culvert ID:

Station No.:

Vanessa Johnston

Leave

7/15/2019 1.