AOP_HYD_Report - OR_FS_ERFO_2020(1)-14(1) FSR 3200(2.54).pdf

Memorandum

Western Federal Lands Highway Division 610 E. Fifth Street

Vancouver, WA 98661-3801

UMATILLA NATIONAL FOREST

FSR 3200 MP 2.54 AOP HYDRAULICS REPORT

To: Matthew Miller, WFLHD Project Manager From: Matthew Dillin, P.E., WFLHD Hydraulics Engineer Date: December 7, 2021 Project: OR FS UMATILLA EFRO 2020(1)-14(1)

Background

Heavy rain in February 2020 caused flooding and damage to roads within the Umatilla National Forest in NE Oregon/SE Washington. ERFO funding to repair eligible sites was approved in February 2021. WFL will be delivering design and construction of 14 damaged sites. One of the sites is a failed culvert on forest service road (FSR) 3200 at mile post (MP) 2.54, Umatilla National Forest, Oregon (Fig. 1). It was determined that the replacement culvert will need to be an aquatic organism passage (AOP) structure.

Western Federal Lands Highway Division (WFLHD) is designing the replacement structure and the Forest Service will maintain the new structure. Recommendations for the proposed aquatic organism passage (AOP) structure design are presented.

AOP Design Criteria

Forest Service confirmed FSR 3200 MP 2.54 crossing requires an AOP structure (45°42’23.4”/- 118°12’10.4”). The crossing is located on an unnamed tributary where Middle Columbia River Steelhead and bull trout may be present. Constructing a passable structure at this location will allow their passage to critical habitat.

The proposed AOP structure has been designed per Stream Simulation: An Ecological Approach to Providing Passage for Aquatic Organisms at Road-Stream Crossings (USDA-Forest Service 2008). This method provides a simplified design methodology that is intended to mimic natural upstream and downstream processes within the culvert. Fish passage, sediment transport, and debris conveyance within the culvert are designed to function as they would in the adjacent natural channel. Determination of the high and low fish passage design flows, water velocity, and water depth is not required for this method since the stream hydraulic characteristics within the culvert are intended to mimic the stream conditions upstream and downstream of the crossing. The method utilizes streambed materials that are like the adjacent channel, providing similar channel complexity, flow depth, flow velocities, and resting areas.

The following requirements have been incorporated into the AOP design:

Flood Conveyance: Culvert capacity exceeds the 100-year recurrence flood (138 cfs) without roadway overtopping.

Culvert Width: Must accommodate the design channel bankfull width plus additional width for construction of stable bank rocks along both sides of the channel inside the culvert. The minimum culvert bed width is 1.3 times the bankfull channel width for non-entrenched streams. For entrenched streams (entrenchment ratio < 1.4) the minimum width is bankfull channel width plus room for natural channel banks.

Memo to: Matthew Miller, WFLHD Project Manager December 7, 2021

Channel Vertical Clearance: Clearance from bed to ceiling must be at least 6-feet to allow for ease of construction, maintenance, and debris removal.

Channel Slope: Reconstructed streambed within the culvert should approximate the average slope of the adjacent stream from approximately ten channel widths upstream and downstream of the culvert site, and should not deviate by more than 1%.

Embedment: Bottom of the culverts should be buried into the streambed between 30 and 50-percent of the culvert height, and a minimum of 3-feet.

Maximum Length of Road Crossing: Length should be less than 150-feet.

Fill Materials: Fill materials are comprised of material similar in size composition to natural bed materials that form the natural stream channels adjacent to the road crossing. Larger material is added for assisting stream gradient retention and providing resting areas for migrating fish.

Water Depth and Velocity: Water depth and velocity in the culvert must closely resemble those existing in the adjacent stream.

FSR 3200 MP 2.54 AOP Culvert

The stream currently crosses Forest Service Road (FSR) 3200 through an existing 48-inch CMP located approximately 100-feet upstream of its confluence with the South Fork Umatilla River (Figure 1). Heavy rains during the winter of 2018 mobilized sediment within the watershed causing the channel to aggrade near the crossing. The existing culvert inlet was near completely plugged by deposited material (Photo 2).

Flows overtopped the road and washed out some of the roadway material (Photos 1 & 4).

The existing channel is fairly steep with an average bed slope of roughly 7-percent within the immediate channel reach. In the upstream channel bankfull widths vary between 7-feet to 10-feet. In the downstream channel bankfull widths vary between 8-feet to 9-feet (Photo 6). Streambed is generally composed of gravel, cobble, and boulders. The maximum observed partical size in the upstream channel was 36-inches.

The maximum observed partical size in the downstream channel was 24-inches. Streambed gradation was measured by digital pebble count using FHWA Hydraulic Toolbox, version 4.2, and processing digital-scaled photographs at seven stream locations. Resulting gradation is D100 18.8 inches, D85 11.9 inches, D50 5.6 inches, and D15 2.3 inches (Photos 7 & 8). The steep watershed and coarse bed material are indicative of a step-pool or boulder-cascade dominant system.

Based on observed post flood conditions, the stream can likely carry a moderate amount of small to moderately sized woody debris. Stream flow when fish passage is needed will be low. Smaller flows could submerge within the natural channel where larger loose material has been deposited. To avoid creation of similar low flow subsurface conditions, material placed within the proposed culvert and outlet will need to avoid excessive amounts of oversized loose bed material or large stone. Continued cycles of aggradation should be expected as the stream erodes, reforms its natural bankfull channel, and transports material from upstream. Additional debris flows during large flood events can be expected due to geomorphic landscape and large amount of unvegetated loose deposited material remaining upstream from the site.

Recommendations:

• Install new AOP culvert on existing stream alignment.

• Install a 66-foot long, corrugated metal culvert with an 12-foot diameter (Sheet F.10).

• To maximize capacity for flow and debris conveyance and accommodate channel aggradation, raise the existing roadway profile 7-feet (elevation 2,573-feet, project datum) to accommodate new culvert design.

• Place culvert invert at elevation 2,560.9-feet upstream and at elevation 2,556.1-feet downstream (project datum).

• Maximizing clearance for debris passage and maintenance access while economizing culvert size by installing culvert at a 7.4% grade.

• Place conserved streambed material inside the culvert matching the gradation of the natural streambed material upstream.

• Slope the channel surface to match immediate channel gradient (7.4 percent).

• Construct a defined channel 8-feet wide at the bottom and 18-inches deep (Sheet F.11).

• Construct the flow channel banks from coarser gravel, cobble, and boulder material.

• Install 14 boulders, approximately 24-inches in diameter, as shown on Sheet F.11 for inducing channel migration and providing low velocity fish resting areas.

• Install Class 4 riprap (FHWA FP-14), minimum 3-feet thick, at the inlet and outlet for controlling road embankment erosion near the culvert (Sheet F.10).

• Install Class 1-C nonwoven geotextile (FHWA FP-14) under the riprap.

• Shape new channel approximately 20 lineal feet immediately upstream and 20 lineal feet immediately downstream for aligning the culvert channel with the natural channel.

• Seed and plant any disturbed areas with local native vegetation.

Construction

The instream work period is July 1st to August 15th. Temporary flow deflectors placed for isolating the work area and diverting the stream flow must have a minimum height of 3-feet above the stream bottom and be stable assuming 8-feet per second parallel flow and 2-feet maximum water depth. Use plastic-lined channels or pipes for temporally conveying stream flow through the construction area. Protect the outfalls from erosion. Fish passage downstream through the temporary flow diversions is required. Ensure fish can pass smoothly from the upstream diversion point to the downstream diversion point. Locate diversion points in the main stream channel. Fish passage upstream is not required. Temporary stream diversions in place must have minimum flow capacity equal to the 2-year discharge (23 cfs). Before installing the flow deflectors, remove fish from the work area to the level and methods specified in the environmental permits.

Vehicular traffic will not be maintained through the work site. Full construction area dewatering is expected up to the groundwater level for excavation and installing the culvert, streambed material, backfill, and riprap. Water pumped from work area must be discharged at an upland area near the site.

Access for culvert installation work can be accomplished within the existing road embankment footprint.

Temporary access route adjacent to the road embankment is needed for installing flow barriers, removing the channel debris, and completing culvert inlet, interior, and outlet work. Constructing the proposed culvert and in-stream work may require heavy track-mounted equipment operating on the stream bed, possibly in water up to 2-feet deep.

The regulatory agencies may require turbidity control and monitoring, and should be contacted for specific requirements and allowable discharge limits.

Stream Impacts

The proposed fish passage culvert is expected to dramatically improve stream flow conveyance, sediment transport, and woody debris transport. Both channel degradation and aggradation is expected upstream, inside, and downstream of the proposed fish passage culvert.

A moderate amount of turbidity and sediment is expected to be released when the flow barriers are removed and stream flow is introduced into the newly constructed culvert. The amount of turbidity and sediment will be reduced by removing the flow barriers gradually introducing the stream flow over an extended two to three-hour time.

Operation and Maintenance

Woody debris will tend to accumulate more frequently at the culvert inlet and inside the culvert barrel.

The FS should increase the frequency of culvert inspection and woody debris removal. Stream degradation is not expected to negatively impact culvert structure or performance. Stream aggradation could reduce the culvert hydraulic capacity. Remove sediment from the upstream channel, inside the culvert, the downstream channel when there is less than 6-feet of clearance between the stream invert and culvert crown at the inlet. Riprap placed at the culvert inlet and outlet should be inspected annually and after each extreme flood event. Replace or reposition dislodged stone.

Floodplain and Flood-rise Impacts

Flood limits and elevations have not been mapped by the National Flood Insurance Program for the site.

The proposed culverts will improve hydraulic conveyance and is not expected to negatively impact flooding at the site.

Hydrology

The USGS StreamStats (version 4.6.2) web-based application was used for delineating the watershed and calculating drainage area (0.87 sq. miles), mean January precipitation (4.68-inches), mean July precipitation (0.69-inches), and soil storage capacity (0.16-inches). Peak discharges were estimated using State of Oregon Water Resources Department regression equations from Estimation of Peak Discharges for Rural, Unregulated Streams in Eastern Oregon (Open File Report SW 06-001). Watershed is entirely within Region 2 for the regression equations. The watershed is mostly forested (Fig. 2). Fires and logging have occurred within the watershed and can occur in the future. No flow diversions or lakes occur. The drainage area is mountainous with moderately incised drainages. Elevations range from 2,490 to 4,370-feet (NAD83/WGS84). A summary of peak discharges and their corresponding water depths at the culvert inlet are presented in Table 1.

Dominant flooding is from snow melt. Larger floods typically occur in April, May, June, and July. Rain-on-snow flood events can occur in October, November, and December. Lowest flows occur in August and September.

Culvert Hydraulics

Water surface profiles and culvert capacities were estimated using the FHWA Culvert Hydraulics Analysis Program, HY-8, version 7.5 (results attached). Floods larger than the 2-year were analyzed assuming culvert slope of 7.4-percent and Manning’s Roughness coefficient of 0.065 for the channel bottom and 0.024 for the culvert sides and top. Headwater depths are shown on Table 1.

Flow depths and average channel velocities inside the proposed culverts for up to the 2-year peak discharge were estimated with the FHWA Hydraulic Toolbox, version 4.4, open-channel flow calculator.

The calculations assumed 7-feet channel bottom width, 1:1 sides, and 7-percent channel slope. The Manning’s Roughness coefficient was iterated until the Froude Number equals 1, for the 2-year discharge.

A Manning’s Roughness coefficient of 0.065 was calculated. Average channel flow velocities inside the culverts are presented in Figure 4.

Attachments: Table 1 – Peak Discharges and Water Depths Figures 1, 2, 3, and 4 Photographs 1 to 9 Drawings F.10, F.11, and F.12 StreamStats Analysis Peak Discharge Regression Analysis HY-8 Calculations Hydraulic Toolbox Calculations

Cc: Sven Leon, Hydraulics Team Lead

Drainage

Site Area (mi²) 2 5 10 25 50 100 500

Culvert Peak Q (cfs) 0.87 23 NA 63 90 113 138 NA

Water Elev. at Inlet (ft) 2,567.9 NA 2,568.0 2,568.4 2,568.7 2,569.0 NA

Clearance at Inlet (ft) 5.0 NA 4.9 4.5 4.2 3.9 NA

Water Depth at Inlet (ft) 1.0 NA 1.1 1.5 1.8 2.1 NA

Notes:

1. State of Oregon Water Resources Department - Magnitude and Freq. Floods in Eastern Oregon

NA = Not analyzed.

Table 1. Peak Discharges (ft3/sec) and Water Depths at Inlet

Recurrence Intervals (years)

Image date: 6/13/2019

Project AOP Culvert Site Location

Project Area Location

USGS Topographic Maps on Google Earth

N

FIGURE 1

FSR 3200 MP 2.54

AOP CULVERT

SITE LOCATION

MP 2.54

1000 feet0

Map printed from Google Earth, Image date 6/13/2019.

N

DA = 0.9 sq. mi.

FIGURE 2

FSR 3200 MP 2.54

AOP CULVERT

DRAINAGE AREA

0 3000 feet

FIGURE 3

FSR 3200 MP 2.54

AOP CULVERT

STREAMBED GRADATION

FIGURE 4

FSR 3200 MP 2.54

AOP CULVERT

2-YEAR FLOW VELOCITY

Photos

PHOTO 1

PHOTO 2

PHOTO 3

8/5/2021

FSR 3200 - MP 2.54

The channel upstream of the existing crossing.

Inlet almost completely burried with sediment deposits.

Looking upstream from culvert inlet.

Culvert Inlet.

Roadway washout exposed top of existing 48" CMP.

Culvert Inlet.

PHOTO 4

PHOTO 5

PHOTO 6

8/5/2021

FSR 3200 - MP 2.54

In the upstream channel bankfull widths vary between 7-feet to 10-feet. In the downstream channel bankfull widths vary between 8-feet to 9-feet.

Culvert Outfall.

Roadway washout exposed top of existing 48" CMP.

Looking downstream from culvert outfall.

The channel downstream of the existing crossing.

Bankfull channel measurement depicting a 9-foot bankfull width.

PHOTO 7

PHOTO 8

PHOTO 9

8/5/2021

FSR 3200 - MP 2.54

Downsream confluence.

Streambed is generally composed of gravel, cobble, and boulders. The maximum observed partical size in the upstream channel was 36-inches. The maximum observed partical size in the downstream channel was 24-inches.

The unnamed tributary flows into the South Fork Umatilla River.

Streambed Sediment.

Streambed Sediment.

N

5 1002.55

SCALE IN FEET

elev. 2556.1'

DS invert elev. 2560.9'

US invert

Existing ground elev. 2566.9'

Prop channel elev. 2562.1'

Prop channel

Slope 7.4%

Slope 7.4% see sheet X.XX for details

(riprap end treatment) method A, class 4 placed riprap see sheet X.XX for details

(riprap end treatment) method A, class 4 placed riprap

LC

100yr WSE boulders, per detail Sheet X.xx material and fish passage

Backfill with streambed see sheet X.XX for details

(riprap end treatment) method A, class 4 placed riprap see sheet X.XX for details

(riprap end treatment) method A, class 4 placed riprap

(L=66.0') metal pipe culvert

144-inch

50 50

FISH SPECIES:

HYDRAULIC INFORMATION

INSTREAM WORK WINDOW: FLOWLINE SLOPE:

OUTLETINLETPIPE

INV N/E/EL:

BURIAL DEPTH:

LOWER BEVEL HEIGHT:

BEVEL:

HEADWALL:

INV N/E/EL:

BURIAL DEPTH:

LOWER BEVEL HEIGHT:

BEVEL:

HEADWALL:

RISE:

WALL THICKNESS:

TYPE:

LENGTH:

SPAN:

PIPE SLOPE:

OHW:

HW :

Q :

Q :

ACTIVE CHANNEL WIDTH: INFILL TYPE: TYPE:

Metal Round Pipe 12'-0" 12'-0"

66.0' 0.168"

0.074 ft/ft 0.074 ft/ft

Streambed Material Conserved

2560.9' 2556.1'

6' - 0" 6' - 0"

2(H):1(V) 2(H):1(V)

Riprap Riprap

3'-0" 3'-0"

23 CFS

138 CFS

1.0 Ft.

2.1 Ft.

Steelhead, Native Trout

8.0 Ft.

July 1 - Aug. 15

E:8788944.7512

N:752311.7439

E:8788897.8700

N:752265.5410

Proposed Road Centerline

New culvert centerline

FLOW

FL

O

W

0+50 0+60 0+70 0+80 0+90 1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+700+50 0+60 0+70 0+80 0+90 1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70

2,545 2,545

2,550 2,550

2,555 2,555

2,560 2,560

2,565 2,565

2,570 2,570

2,575 2,575

1+80

2,580 2,580

' m in m in

Traveled Way

9.

4°

32.7' 33.1'

:2

A

M

D e c e m b e r

U n n a m e d

P la n

P la n P r o f il e

S h e e t] c p w w o r k

\d

\o r e f f s

.5

H Y

D A

O P

.d g n

PLAN & PROFILE

AOP CULVERT

FSR 3200 MP 2.54

PROFILE

PLAN

STATE PROJECT

NUMBER

SHEET

OR FS ERFO 2020(1)-14(1) F.10

NPS Drwg No. XXX/XXXX NPS PMIS No. 000000

NO SCALE

SECTION A-A

Flow

SECTION B-B

PLAN

LC

F lo w

A A

B

B

NOTE:

FOOTNOTE:

D

D ty p

(typ.)

(typ.)

36" min.

3.

2.

1.

or Length on plan sheet

Streambed sediment

Streambed cobble

Pipe arch culvert wall

Box culvert wall boulder

Fish passage boulder

Fish passage

Stagger in-channel fish passage boulder within the culvert span.

streambed cobble, and bank stone gradations.

See special contract requirements for streambed sediment, Mix streambed cobbles evenly throughout streambed sediment.

[3]Fish passage boulder

[2]Bank stone

[2]Bank stones

[1] d e p th b u r ia l b u r ia l d e p th

Round pipe culvert wall top

Streambed

Culvert outlet

Culvert wall

TREATMENT

CULVERT INTERIOR

SIMULATED STREAM

sediment

Streambed

Culvert inlet

Streambed cobble

Streambed sediment

Channel flowline depressed low-flow

Channel flowline with

18-inches or as specified on plan sheet.[4] dimension.

smallest4 3 Embed fish passage boulders within active channel [3] streambed sediment.

Construct well defined banks with bank stone and[2] parabolic shape. Include meandering depressed low-flow.

Slope streambed aggregate towards flowline to ensure[1] low-flow through culvert

Meander depressed

F.11

STATE PROJECT

NUMBER

SHEET

U

S In t2 D c p w w o r k \d

\w a e f e l.

d g n

OR FS ERFO 2020(1)-14(1)

:4

A M

N o v e m b e r

C h e c k e d b y

D e s ig n e d b y

W

D2

D ty p

Channel Elev. = 2566.9' banks inside culvert

Construct well-defined cobble

ELEVATIONS

AOP CULVERT

FSR 3200 MP 2.54

F.12

STATE PROJECT

NUMBER

SHEET

OR FS ERFO 2020(1)-14(1)

/1

/2 o r e f f s

.5 H

Y D

A O

P X

S .d g n

D

D e s ig n I n tl

F t-

D

C h e c k e d b y

D e s ig n e d b y

CULVERT OUTLET

CULVERT INLET

existing grade, min. new stream channel depth 18-inches.

streambed material to create smooth transition to

1. Construct bank area, excavate or place conserved

NOTE:

bank areas.

2. Place conserved streambed material over constructed upstream

Existing ground, centerline proposed grade road centerline

Existing grade road

Invert elev. = 2560.9'

144-inch metal pipe culvert

Conserved streambed material

Channel Elev. = 2562.1' banks inside culvert

Construct well-defined cobble downstream

Existing ground, centerline proposed grade road centerline

Existing grade road

Invert elev. = 2556.1'

144-inch metal pipe culvert

Conserved streambed material

3200 - 2.54

Basin Characteristics

Parameter Code Parameter Description Value Unit

DRNAREA Area that drains to a point on a stream 0.87 square miles

DRNDENSITY Basin drainage density defined as total stream length divided by drainage area. 0.97 dimensionless

ELEV Mean Basin Elevation 3450 feet

PRECIP Mean Annual Precipitation 35.4 inches

ELEVMAX Maximum basin elevation 4370 feet

MINTEMP Mean annual minimum air temperature over basin surface area as defined in SIR 2008-5126 34.1 degrees F

IMPERV Percentage of impervious area 0 percent

BSLOPD Mean basin slope measured in degrees 27.7 degrees

JANMAXTMP Mean Maximum January Temperature 35.2 degrees F

MINBELEV Minimum basin elevation 2490 feet

SOILPERM Average Soil Permeability 1.13 inches per hour

ASPECT basin average of topographic slope compass directions from elevation grid 139 degrees

FOREST Percentage of area covered by forest 49.5 percent

I24H2Y Maximum 24-hour precipitation that occurs on average once in 2 years - Equivalent to precipitation intensity index

1.59 inches

JANAVPRE2K Mean January Precipitation 4.68 inches

JANMAXT2K Mean Maximum January Temperature from 2K resolution PRISM 1961-1990 data 35.1 degrees F

JANMINT2K Mean Minimum January Temperature from 2K resolution PRISM PRISM 1961-1990 data 24.2 degrees F

JANMINTMP Mean Minimum January Temperature 20.8 degrees F

JULAVPRE2K Mean July Average Precipitation 0.69 inches

LC11BARE Percentage of barren from NLCD 2011 class 31 0 percent

LC11CRPHAY Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2011 0 percent

LC11DEVHI Percentage of area developed, high intensity, NLCD 2011 class 24 0 percent

LC11DVLO Percentage of developed area, low intensity, from NLCD 2011 class 22 0 percent

LC11DVMD Percentage of area developed, medium intensity, NLCD 2011 class 23 0 percent

Region ID: OR Workspace ID: OR20211123003908325000 Clicked Point (Latitude, Longitude): 45.70700, -118.20317 Time: 2021-11-22 16:39:30 -0800

Page 2 of 15StreamStats

11/22/2021https://streamstats.usgs.gov/ss/

Parameter Code Parameter Description Value Unit

LC11DVOPN Percentage of developed open area from NLCD 2011 class 21 0 percent

LC11FORSHB Percentage of forests and shrub lands, classes 41 to 52, from NLCD 2011 71 percent

LC11HERB Percentage of herbaceous from NLCD 2011 classes 71-74 29 percent

LC11IMP Average percentage of impervious area determined from NLCD 2011 impervious dataset 0.00795 percent

LC11WATER Percent of open water, class 11, from NLCD 2011 0 percent

LC11WETLND Percentage of wetlands, classes 90 and 95, from NLCD 2011 0 percent

MAJ_ROADS Length of non-state major roads in basin 0 miles

MAXBSLOPD Maximum basin slope, in degrees, using ArcInfo Grid with NHDPlus 30-m resolution elevation data. 41.2 degrees

MAXTEMP Mean annual maximum air temperature over basin area from PRISM 1971-2000 800-m grid 56.7 degrees F

MINBSLOPD Minimum basin slope, in degrees, using ArcInfo Grid with NHDPlus 30-m resolution elevation data. 1 degrees

MIN_ROADS Length of non-state minor roads in basin 0.0189 miles

ORREG2 Oregon Region Number 363 dimensionless

OR_HIPERMA Percent basin surface area containing high permeability aquifer units as defined in SIR 2008-5126 0 percent

OR_HIPERMG Percent basin surface area containing high permeability geologic units as defined in SIR 2008-5126 0 percent

RELIEF Maximum - minimum elevation 1880 feet

STATE_HWY Length of state highways in basin 0 miles

STATSGODEP Area-weighted average soil depth from NRCS STATSGO database 40.8 inches

STRMTOT total length of all mapped streams (1:24,000-scale) in the basin 1.36 miles

WATCAPORC Available water capacity from STATSGO data using methods from SIR 2005-5116 0.16 inches

WATCAPORR Available water capacity from STATSGO data using methods from SIR 2008-5126 0.16 inch per inch

Low-Flow Statistics Parameters [LowFlow Ann Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

DRNDENSITY Basin Drainage Density 0.97 dimensionless 0.535 1.047

ELEV Mean Basin Elevation 3450 feet 2776.328 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

Low-Flow Statistics Disclaimers [LowFlow Ann Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Low-Flow Statistics Flow Report [LowFlow Ann Region06 2008 5126]

Statistic Value Unit

7 Day 2 Year Low Flow 0 ft^3/s

7 Day 10 Year Low Flow 0 ft^3/s

Low-Flow Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

Flow-Duration Statistics Parameters [LowFlow Ann Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

ELEVMAX Maximum Basin Elevation 4370 feet 4347.2594 12644.1866

Page 3 of 15StreamStats

Flow-Duration Statistics Disclaimers [LowFlow Ann Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Flow-Duration Statistics Flow Report [LowFlow Ann Region06 2008 5126]

Statistic Value Unit

5 Percent Duration 3.74 ft^3/s

10 Percent Duration 2.3 ft^3/s

25 Percent Duration 0.861 ft^3/s

50 Percent Duration 0.257 ft^3/s

95 Percent Duration 0 ft^3/s

Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

Monthly Flow Statistics Parameters [LowFlow Apr Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

MINTEMP Mean Annual Min Temperature 34.1 degrees F 22.667 37.608

IMPERV Percent Impervious 0 percent 0 10.539

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

Monthly Flow Statistics Parameters [LowFlow Aug Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7516.826

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

Monthly Flow Statistics Parameters [LowFlow Dec Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

BSLOPD Mean Basin Slope degrees 27.7 degrees 6.999 28.849

Monthly Flow Statistics Parameters [LowFlow Feb Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

JANMAXTMP Mean Maximum January Temperature 35.2 degrees F 26.58 36.801

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

BSLOPD Mean Basin Slope degrees 27.7 degrees 5.681 28.849

Monthly Flow Statistics Parameters [LowFlow Jan Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

BSLOPD Mean Basin Slope degrees 27.7 degrees 5.681 28.849

Monthly Flow Statistics Parameters [LowFlow Jul Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

Page 4 of 15StreamStats

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.17 12239.38

PRECIP Mean Annual Precipitation 35.4 inches 22.2 57.9

ELEVMAX Maximum Basin Elevation 4370 feet 4347 12644

Monthly Flow Statistics Parameters [LowFlow Jun Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7516.826

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

ELEVMAX Maximum Basin Elevation 4370 feet 4347.2594 12644.1866

Monthly Flow Statistics Parameters [LowFlow Mar Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

JANMAXTMP Mean Maximum January Temperature 35.2 degrees F 26.58 36.801

PRECIP Mean Annual Precipitation 35.4 inches 23.1183 57.8959

Monthly Flow Statistics Parameters [LowFlow May Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7516.826

PRECIP Mean Annual Precipitation 35.4 inches 22.246 56.4334

Monthly Flow Statistics Parameters [LowFlow Nov Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

PRECIP Mean Annual Precipitation 35.4 inches 23.1183 57.8959

ELEVMAX Maximum Basin Elevation 4370 feet 4347.2594 12644.1866

Monthly Flow Statistics Parameters [LowFlow Oct Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 23.1183 57.8959

Monthly Flow Statistics Parameters [LowFlow Sep Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2842.254 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

Monthly Flow Statistics Disclaimers [LowFlow Apr Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Apr Region06 2008 5126]

Statistic Value Unit

Apr 7 Day 2 Year Low Flow 1.15 ft^3/s

Apr 7 Day 10 Year Low Flow 0.484 ft^3/s

Page 5 of 15StreamStats

Monthly Flow Statistics Disclaimers [LowFlow Aug Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Aug Region06 2008 5126]

Statistic Value Unit

Aug 7 Day 2 Year Low Flow 0.0767 ft^3/s

Aug 7 Day 10 Year Low Flow 0.0542 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Dec Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Dec Region06 2008 5126]

Statistic Value Unit

Dec 7 Day 2 Year Low Flow 0.407 ft^3/s

Dec 7 Day 10 Year Low Flow 0 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Feb Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Feb Region06 2008 5126]

Statistic Value Unit

Feb 7 Day 2 Year Low Flow 0.63 ft^3/s

Feb 7 Day 10 Year Low Flow 0.347 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Jan Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Jan Region06 2008 5126]

Statistic Value Unit

Jan 7 Day 2 Year Low Flow 0.404 ft^3/s

Jan 7 Day 10 Year Low Flow 0.262 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Jul Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Jul Region06 2008 5126]

Statistic Value Unit

Jul 7 Day 2 Year Low Flow 0.0889 ft^3/s

Jul 7 Day 10 Year Low Flow 0.0664 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Jun Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Jun Region06 2008 5126]

Statistic Value Unit

Jun 7 Day 2 Year Low Flow 0.19 ft^3/s

Jun 7 Day 10 Year Low Flow 0.102 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Mar Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Page 6 of 15StreamStats

Monthly Flow Statistics Flow Report [LowFlow Mar Region06 2008 5126]

Statistic Value Unit

Mar 7 Day 2 Year Low Flow 0.634 ft^3/s

Mar 7 Day 10 Year Low Flow 0.246 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow May Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow May Region06 2008 5126]

Statistic Value Unit

May 7 Day 2 Year Low Flow 0.541 ft^3/s

May 7 Day 10 Year Low Flow 0.184 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Nov Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Nov Region06 2008 5126]

Statistic Value Unit

Nov 7 Day 2 Year Low Flow 0.108 ft^3/s

Nov 7 Day 10 Year Low Flow 0 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Oct Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Oct Region06 2008 5126]

Statistic Value Unit

Oct 7 Day 2 Year Low Flow 0.0428 ft^3/s

Oct 7 Day 10 Year Low Flow 0 ft^3/s

Monthly Flow Statistics Disclaimers [LowFlow Sep Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report [LowFlow Sep Region06 2008 5126]

Statistic Value Unit

Sep 7 Day 2 Year Low Flow 0 ft^3/s

Sep 7 Day 10 Year Low Flow 0 ft^3/s

Monthly Flow Statistics Flow Report [Area-Averaged]

Statistic Value Unit

Apr 7 Day 2 Year Low Flow 1.15 ft^3/s

Apr 7 Day 10 Year Low Flow 0.484 ft^3/s

Aug 7 Day 2 Year Low Flow 0.0767 ft^3/s

Aug 7 Day 10 Year Low Flow 0.0542 ft^3/s

Dec 7 Day 2 Year Low Flow 0.407 ft^3/s

Dec 7 Day 10 Year Low Flow 0 ft^3/s

Feb 7 Day 2 Year Low Flow 0.63 ft^3/s

Feb 7 Day 10 Year Low Flow 0.347 ft^3/s

Jan 7 Day 2 Year Low Flow 0.404 ft^3/s

Jan 7 Day 10 Year Low Flow 0.262 ft^3/s

Page 7 of 15StreamStats

Jul 7 Day 2 Year Low Flow 0.0889 ft^3/s

Jul 7 Day 10 Year Low Flow 0.0664 ft^3/s

Jun 7 Day 2 Year Low Flow 0.19 ft^3/s

Jun 7 Day 10 Year Low Flow 0.102 ft^3/s

Mar 7 Day 2 Year Low Flow 0.634 ft^3/s

Mar 7 Day 10 Year Low Flow 0.246 ft^3/s

May 7 Day 2 Year Low Flow 0.541 ft^3/s

May 7 Day 10 Year Low Flow 0.184 ft^3/s

Nov 7 Day 2 Year Low Flow 0.108 ft^3/s

Nov 7 Day 10 Year Low Flow 0 ft^3/s

Oct 7 Day 2 Year Low Flow 0.0428 ft^3/s

Oct 7 Day 10 Year Low Flow 0 ft^3/s

Sep 7 Day 2 Year Low Flow 0 ft^3/s

Sep 7 Day 10 Year Low Flow 0 ft^3/s

Monthly Flow Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

January Flow-Duration Statistics Parameters [LowFlow Jan Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

MINBELEV Minimum Basin Elevation 2490 feet 961.2018 5123.8393

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

January Flow-Duration Statistics Disclaimers [LowFlow Jan Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

January Flow-Duration Statistics Flow Report [LowFlow Jan Region06 2008 5126]

Statistic Value Unit

January 5 Percent Duration 6.26 ft^3/s

January 10 Percent Duration 3.49 ft^3/s

January 25 Percent Duration 1.47 ft^3/s

January 50 Percent Duration 0.621 ft^3/s

January 95 Percent Duration 0.0737 ft^3/s

January Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

February Flow-Duration Statistics Parameters [LowFlow Feb Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2652.995 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

DRNDENSITY Basin Drainage Density 0.97 dimensionless 0.535 1.047

BSLOPD Mean Basin Slope degrees 27.7 degrees 5.681 28.849

Page 8 of 15StreamStats

February Flow-Duration Statistics Disclaimers [LowFlow Feb Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

February Flow-Duration Statistics Flow Report [LowFlow Feb Region06 2008 5126]

Statistic Value Unit

February 5 Percent Duration 4.68 ft^3/s

February 10 Percent Duration 2.79 ft^3/s

February 25 Percent Duration 1.49 ft^3/s

February 50 Percent Duration 0.567 ft^3/s

February 95 Percent Duration 0.242 ft^3/s

February Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

March Flow-Duration Statistics Parameters [LowFlow Mar Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

PRECIP Mean Annual Precipitation 35.4 inches 23.1183 57.8959

SOILPERM Average Soil Permeability 1.13 inches per hour 0.57 10.188

ELEVMAX Maximum Basin Elevation 4370 feet 3778.0715 12644.1866

March Flow-Duration Statistics Disclaimers [LowFlow Mar Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

March Flow-Duration Statistics Flow Report [LowFlow Mar Region06 2008 5126]

Statistic Value Unit

March 5 Percent Duration 3.89 ft^3/s

March 10 Percent Duration 2.71 ft^3/s

March 25 Percent Duration 1.49 ft^3/s

March 50 Percent Duration 0.788 ft^3/s

March 95 Percent Duration 0.19 ft^3/s

March Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

April Flow-Duration Statistics Parameters [LowFlow Apr Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

IMPERV Percent Impervious 0 percent 0 10.539

MINBELEV Minimum Basin Elevation 2490 feet 961.2018 5123.8393

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

April Flow-Duration Statistics Disclaimers [LowFlow Apr Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

April Flow-Duration Statistics Flow Report [LowFlow Apr Region06 2008 5126]

Statistic Value Unit

Page 9 of 15StreamStats

April 5 Percent Duration 5.49 ft^3/s

April 10 Percent Duration 4.42 ft^3/s

April 25 Percent Duration 3.2 ft^3/s

April 50 Percent Duration 2.21 ft^3/s

April 95 Percent Duration 0.595 ft^3/s

April Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

May Flow-Duration Statistics Parameters [LowFlow May Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7516.826

IMPERV Percent Impervious 0 percent 0 10.539

PRECIP Mean Annual Precipitation 35.4 inches 22.246 56.4334

ELEVMAX Maximum Basin Elevation 4370 feet 4347.2594 12644.1866

May Flow-Duration Statistics Disclaimers [LowFlow May Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

May Flow-Duration Statistics Flow Report [LowFlow May Region06 2008 5126]

Statistic Value Unit

May 5 Percent Duration 4.32 ft^3/s

May 10 Percent Duration 3.3 ft^3/s

May 25 Percent Duration 2.02 ft^3/s

May 50 Percent Duration 1.08 ft^3/s

May 95 Percent Duration 0.192 ft^3/s

May Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

June Flow-Duration Statistics Parameters [LowFlow Jun Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7516.826

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

DRNDENSITY Basin Drainage Density 0.97 dimensionless 0.506 1.051

June Flow-Duration Statistics Disclaimers [LowFlow Jun Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

June Flow-Duration Statistics Flow Report [LowFlow Jun Region06 2008 5126]

Statistic Value Unit

June 5 Percent Duration 1.14 ft^3/s

June 10 Percent Duration 0.764 ft^3/s

June 25 Percent Duration 0.398 ft^3/s

Page 10 of 15StreamStats

June 50 Percent Duration 0.225 ft^3/s

June 95 Percent Duration 0.0573 ft^3/s

June Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

July Flow-Duration Statistics Parameters [LowFlow Jul Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.17 12239.38

PRECIP Mean Annual Precipitation 35.4 inches 22.2 57.9

ELEVMAX Maximum Basin Elevation 4370 feet 4347 12644

July Flow-Duration Statistics Disclaimers [LowFlow Jul Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

July Flow-Duration Statistics Flow Report [LowFlow Jul Region06 2008 5126]

Statistic Value Unit

July 5 Percent Duration 0.265 ft^3/s

July 10 Percent Duration 0.214 ft^3/s

July 25 Percent Duration 0.146 ft^3/s

July 50 Percent Duration 0.105 ft^3/s

July 95 Percent Duration 0.14 ft^3/s

July Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

August Flow-Duration Statistics Parameters [LowFlow Aug Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7516.826

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

ELEVMAX Maximum Basin Elevation 4370 feet 4453.695 12644.1866

DRNDENSITY Basin Drainage Density 0.97 dimensionless 0.506 1.051

MINBELEV Minimum Basin Elevation 2490 feet 961.2018 5123.8393

August Flow-Duration Statistics Disclaimers [LowFlow Aug Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

August Flow-Duration Statistics Flow Report [LowFlow Aug Region06 2008 5126]

Statistic Value Unit

August 5 Percent Duration 0.178 ft^3/s

August 10 Percent Duration 0.159 ft^3/s

August 25 Percent Duration 0.133 ft^3/s

August 50 Percent Duration 0.102 ft^3/s

August 95 Percent Duration 0.02 ft^3/s

Page 11 of 15StreamStats

August Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

September Flow-Duration Statistics Parameters [LowFlow Sep Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2842.254 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

ELEVMAX Maximum Basin Elevation 4370 feet 4347.2594 12644.1866

September Flow-Duration Statistics Disclaimers [LowFlow Sep Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

September Flow-Duration Statistics Flow Report [LowFlow Sep Region06 2008 5126]

Statistic Value Unit

September 5 Percent Duration 0.202 ft^3/s

September 10 Percent Duration 0.155 ft^3/s

September 25 Percent Duration 0.104 ft^3/s

September 50 Percent Duration 0.0647 ft^3/s

September 95 Percent Duration 0.0322 ft^3/s

September Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

October Flow-Duration Statistics Parameters [LowFlow Oct Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

ELEV Mean Basin Elevation 3450 feet 2776.328 7455.974

PRECIP Mean Annual Precipitation 35.4 inches 23.1183 57.8959

ELEVMAX Maximum Basin Elevation 4370 feet 4347.2594 12644.1866

MINBELEV Minimum Basin Elevation 2490 feet 961.2018 5123.8393

BSLOPD Mean Basin Slope degrees 27.7 degrees 6.999 28.849

October Flow-Duration Statistics Disclaimers [LowFlow Oct Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

October Flow-Duration Statistics Flow Report [LowFlow Oct Region06 2008 5126]

Statistic Value Unit

October 5 Percent Duration 0.247 ft^3/s

October 10 Percent Duration 0.185 ft^3/s

October 25 Percent Duration 0.108 ft^3/s

October 50 Percent Duration 0.0706 ft^3/s

October 95 Percent Duration 0 ft^3/s

October Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

Page 12 of 15StreamStats

November Flow-Duration Statistics Parameters [LowFlow Nov Region06 2008 5126]

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

DRNDENSITY Basin Drainage Density 0.97 dimensionless 0.488 1.051

MINBELEV Minimum Basin Elevation 2490 feet 961.2018 5123.8393

PRECIP Mean Annual Precipitation 35.4 inches 23.1183 57.8959

BSLOPD Mean Basin Slope degrees 27.7 degrees 6.999 29.271

November Flow-Duration Statistics Disclaimers [LowFlow Nov Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

November Flow-Duration Statistics Flow Report [LowFlow Nov Region06 2008 5126]

Statistic Value Unit

November 5 Percent Duration 1.01 ft^3/s

November 10 Percent Duration 0.571 ft^3/s

November 25 Percent Duration 0.449 ft^3/s

November 50 Percent Duration 0.417 ft^3/s

November 95 Percent Duration 0 ft^3/s

November Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

December Flow-Duration Statistics Parameters [LowFlow Dec Region06 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.165 12239.38

DRNDENSITY Basin Drainage Density 0.97 dimensionless 0.535 1.051

MINBELEV Minimum Basin Elevation 2490 feet 961.2018 5123.8393

PRECIP Mean Annual Precipitation 35.4 inches 22.246 57.8959

December Flow-Duration Statistics Disclaimers [LowFlow Dec Region06 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

December Flow-Duration Statistics Flow Report [LowFlow Dec Region06 2008 5126]

Statistic Value Unit

December 5 Percent Duration 2.36 ft^3/s

December 10 Percent Duration 1.35 ft^3/s

December 25 Percent Duration 0.636 ft^3/s

December 50 Percent Duration 0.302 ft^3/s

December 95 Percent Duration 0 ft^3/s

December Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

Bankfull Statistics Parameters [Intermontane Plateau D Bieger 2015]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 3.62934 7579.9152

Page 13 of 15StreamStats

Bankfull Statistics Parameters [Columbia Plateau P Bieger 2015]

DRNAREA Drainage Area 0.87 square miles 17.698824 7579.957671

Bankfull Statistics Parameters [USA Bieger 2015]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 0.07722 59927.7393

Bankfull Statistics Parameters [Western Cordillera CastroJackson 2001]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 0.87 square miles 19.6 5090

Bankfull Statistics Disclaimers [Intermontane Plateau D Bieger 2015]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Bankfull Statistics Flow Report [Intermontane Plateau D Bieger 2015]

Statistic Value Unit

Bieger_D_channel_width 5.1 ft

Bieger_D_channel_depth 0.3 ft

Bieger_D_channel_cross_sectional_area 1.39 ft^2

Bankfull Statistics Disclaimers [Columbia Plateau P Bieger 2015]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Bankfull Statistics Flow Report [Columbia Plateau P Bieger 2015]

Statistic Value Unit

Bieger_P_channel_width 2.78 ft

Bieger_P_channel_depth 0.895 ft

Bieger_P_channel_cross_sectional_area 1.05 ft^2

Ba…