Repair Trail Abutments Compartment 57 Statement of Work.pdf

USDA-FS Repair Trail Abutments Compartment 57

Statement of Work

The National Forest and Grasslands in Texas, Sam Houston National Forest, Huntsville Texas, Walker County, is seeking proposals for the following:

Project: Compartment 57 Bike Trail Bridge Abutment Repair

Location: Approximately 500 yards southeast of the 900 block of Cherry Hills Drive, Elkins Lake, on the Sam Houston National Forest, Huntsville, Texas, Walker County.

The Objective: Repair bridge abutments in accordance with attached proposal and drawings. Reconstruct and stabilize both abutments in accordance with attached design report and drawings using acceptable means approved by the forest service representative. See Attachment III

Scope of Work: Install helical piles and anchors, or other means of support, in accordance with manufacturer's instructions and guidelines. Place Class II rip rap IAW section 705, Table 705-1 of FP-14 (Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects), under the bridge on both sides of the stream for erosion control and to prevent further scouring. Clearing and grubbing is required in order to access the bridge approaches with equipment.

Also, stream banks need to be laid back and roots removed for rip rap placement and erosion control. Alternative options for erosion control will be considered.

Access from the west side is via utility easement and the east side by using NFSR286 to the bike trail. Level, seed, and mulch all disturbed areas when complete. Barricades, construction signage, and caution tape for safety is required during construction.

Attachment I – Location Maps Attachment II – Photos Attachment III – Design Report for Huntsville C-57 Mt. Bike Trail

Bridge Site (July 2014, used for original bridge and abutments construction)

Attachment IV – C-57 Bike Trail Drawings (July 2014, used for original bridge and abutments construction)

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Compartment 57 Mountain Bike Trail Bridge Abutment Replacement

Sam Houston National Forest National Forests & Grasslands in Texas

Walker County, Texas Figure 1: Vicinity Map

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Compartment 57 Mountain Bike Trail Bridge Abutment Replacement

Sam Houston National Forest National Forests & Grasslands in Texas

Huntville 7.5' Quadrangle Walker County, Texas

Figure 2: Project Location

Map by wkingsborough March 29, 2021 NAD 1983 Texas Statewide Mapping System

Legend Trail Contour Stream Roads Compartment ³

0 0.5 10.25 Miles

0 0.45 0.90.225 Kilometers

1:24,000

Bridge

1 Bike Trail Bridge in Compartment 57 Sam Houston National Forest

2 Sunken Bridge Approach from the East

ATTACHMENT II BRIDGE APPROACH FROM THE EAST SIDE

3 Scouring under bridge on the East side

4 Erosion under the East side of the Trail Bridge

5 Position of Bridge below trail level on the East side

6 Current Bridge position from the West side

7 Failing Abutment from the East side

8 Bent and leaning support on the East side

I. General Information:

• Proposed Huntsville C-57 trail bridge site located approximately 4 miles southwest of Huntsville, Texas in Walker County on the Sam Houston Ranger District of the National Forest of Texas. Interstate 45 borders on the east boundary of the proposed bicycle trail system. The USFS Trails Unlimited Enterprise Team will schedule to install the new bridge in fall of 2014.

• 7.5 minute Series USGS Topographic Map – Huntsville, TX – Walker County.

• New proposed bridge crossing: LAT 30*39’23.90” N and LONG 95*31’20.55” W. It is approximately 150 ft. downstream of the private property boundary that corners at the steam channel.

• Bridge site topographic Licensed Surveyors: Randy Schrank, R10 – Chugach NF, Alaska, and William Nielson, R10, Alaska. Site survey performed in February, 2013.

• Others Forest Service personnel that visited the site to select and layout the bridge site and collect site information: USFS Trails Unlimited Enterprise Team – Cam Lockwood – Enterprise Team Leader, Jerry Barrow, Civil Engineer, Rick Pinson – Trails Technician, Marcia O’Loughlin – TU Civil Engineering Technician, and Jason Morton, Trail Coordinator on S.H.R.D.,TX. District Ranger Warren Ojai was also present on one field review.

• The designed trail users for the Huntsville C-57 trail bridge will be mountain bikers. The bridge will be on a new trail system to be constructed by a private trail contractor. The Forest Service Trails Accessibility Guidelines (FSTAG) do not apply. The trail is to be on rolling terrain on fine sandy – sandy clay loam soils. The bridge structure itself will meet the ADA requirements once constructed.

• The proposed bridge for the Huntsville C-57 bike trail crossing over an unspecified drainage is designed to be 6 ft. wide x 55 ft. long span sloped end Fiber Reinforced Polymer (FRP) bridge with a pressure treated 3 x 12 wood deck. The FRP Bridges are lightweight, portable, corrosive resistant, and durable, can be assembled on site and are cost effective for the longer spans.

• Steel, aluminum and timber trail bridges were considered, but due their cost, heavy weight to erect in the wooded area makes it difficult to move a large and heavy pre-fabricated structure to the site. The FRP Bridge is the recommended option.

ATTACHMENT III

Design Report for Huntsville C-57 Mt. Bike Trail Bridge Site Sam Houston Ranger District

National Forest in Texas USFS Trail Unlimited Enterprise Team

PLAN VIEW

PROFILE VIEW

Figure 1: The Sam Houston Ranger District proposed bridge crossing for hikers and mountain bicycles. The proposed sloped end FRP bridge structure is to be 6 ft. wide x 55 ft. long on Sutter Wall abutments as shown in the Profile View.

Figure 2: Vicinity Map

II. Hydrology and Hydraulics

• It was determined a formal hydrology study would not be performed for the site as it would not be cost effective for the benefit since it is a small forested watershed, the bridge designed height of 12 ft. above the stream bed for the proposed structure, and the drainage side slope evidence of high water flows at 6 ft. above the streambed.

• The watershed above the proposed Huntsville C-57 Trail Bridge crossing of the unspecified drainage is approximately 250 acres of gently rolling forestlands.

• The drainage is a perennial 8-9 ft. deep channel that is classified as a G5 – entrenched stream type per “Applied River Morphology” by Dave Rosgen.

• Jules Riley, Hydrologist with USFS Vegetation Management Solutions Enterprise Unit, was consulted via telephone conversation about the site. She did not make a field visit or perform stream calculations for this specific site. She has performed field reviews for numerous other trail bridge sites on the Sam Houston Ranger District. However, reviewing the surveyed plan and profile of the site and the existing vegetation evidence along the banks, she and the designers knew they were well above the estimated Q100 of 6 ft. above the streambed at the proposed bridge site crossing. The proposed bridge design elevation will have a 6 ft. freeboard above the field estimated Q100.

• The channel is incised and has average slope of 0.5%.

Figure 3: The proposed Huntsville C-57 trail bridge crossing a drainage on one of the most northern land tracts of the Sam Houston Ranger District. The bridge design shall extend the east bridge end 18 ft. beyond the top bank to set on the Sutter abutments. The abutments shall be approximately beyond the location of the large log that is viewed in the foreground on the hillside.

Figure 4: Flagging the proposed bridge centerline across the drainage.

Propose 6 ft. wide x 55 ft. long sloped end FRP Bridge with 54 inch handrails.

Figure 5: Picture taken in center of drainage channel at the proposed C-57 bridge crossing – viewing downstream, one day after a hard rain shower.

Figure 6: Photo from the west bank of proposed C-57 bridge crossing, viewing upstream.

Note GPS unit hanging on tree with flagging that is along the proposed bridge centerline.

III. Geotechnical Investigation

• Site investigation was performed by Cam Lockwood, Jerry Barrow, Rick Pinson, Marcia O’Loughlin of USFS Trails Unlimited Enterprise Team, and Jason Morton and Warren Ojai ( Sam Houston District Ranger) of the USFS. Two field trips were made in different seasons.

• The private trail contractor and bike club members had selected a bridge crossing and estimated a 65 ft. long bridge. The Forest Service team examined the soil type, erosion factors, vegetation, and the channel stability and determined to relocate the crossing approximately 100 ft. upstream. During the field review, the team pulled a measuring tape to determine that a 45 ft. long bridge could fit the site. Once the topographic survey was completed with elevations, it was decided to design for a 55 ft. bridge to pull the bridge ends and abutments further back from the weak channel banks.

• The soil type at the proposed site is determined to be Kanebreak – a fine sandy loam to sandy clay loam. Information from Soil Survey of Walker County, Texas 1979: USDA Soil Conservation Service and Forest Service and the Texas Agricultural Experiment Station.

Classifying Soils for Engineering – 1. Unified Soil Classification and 2. American Association of State Highways and Transportation Officials.

• Soil at the new proposed bridge site may flood frequently for short durations at the lower flat terrain elevation. It has slow percolation rates, has an unstable soil structure and therefore erodes easily as noted along the drainage banks. It is mildly alkaline and can corrode uncoated steel, and has a fairly high shrink and swell factor. It was noted that the adjacent sub-development streets and driveways have settlement issues.

• The proposed Sutter wall abutment system can handle the soil conditions very well.

• The proposed H-piles will be powder coated to make them resistant to corrosion.

• Vegetation is thick at the site. Loblolly pine, water oak, hackberry, sweet gum and white oak are common species. The soils are good for timber production, but not large scale engineering projects or productive crop lands because of the wetness.

• Minimum soil disturbance shall occur at the proposed bridge crossing for construction.

Soldier pile bin walls lined with geotextile fabric with P.T. timber lagging, will be backfilled with clean compacted TDOT stone. The bin abutment shall raise the bridge 1

ft. to 2 ft. above the existing ground. The front abutment walls will be set back 9 to 13.5

ft. from the top of the creek banks. The bridge proposed is 55 ft. long.

• Assume minimum allowable soil pressure to be 1500 psf for the proposed bridge site.

Figure 7: Proposed flagged and measured bridge alignment and approach grades at the crossing. The bank channel is well vegetated.

IV. Superstructure Design

• Recommend 6 ft. wide x 55 ft. Fiber Reinforced Polymer Bridge sloped end bridge

• Reviewed timber, aluminum, and steel bridges. Considered higher cost of aluminum, the long span for a timber structure, the difficulty of getting a heavy steel structure to the site and erected, the FRP Bridge the recommended option.

• Design Guidelines of 90 lbs./sq. ft. and horse point loads.

• AASHTO LRFD Bridge Design Specifications, 5th Edition 2010

• AASHTO LRFD Guide Specifications for the Design of Pedestrian Bridges, Dec. 2009.

• Design guidelines established by Missoula Technology and Development Center in publication 0623-2824 “A Guide to Fiber-Reinforced Polymer Trails Bridges”.

• The bridge structure will be a prefabricated structure to be stamped by a professional engineer of the company. Plans and calculations will be added to the design folder after approval.

Figure 8: Example: 6 x 55 LF FRP Bridge erected on steel H-Pile and PT timber lagging abutments across Cottonwood Creek for Yellow Trail Bridge, Texas – LBJ Grasslands.

Figure 9: Completed FRP Bridge and timber decking at Yellow Trail Creek Bridge crossing with 54 inch high handrails. The Yellow Trail was for horses and required additional surface decking.

The Huntsville C-57 FRP Bridge will have a 3 inch x 12 inch PT decking only for bicycles and also the 54 inch high handrails.

V. Substructure Design

• Proposed bridge abutments to be constructed of powder coated steel soldier piles (H-piles) and steel cap rails with PT 2” x 12” x 4 ft. timber lagging bin walls. There shall be two bin compartments connected together per each bridge abutment and lined with geotextile fabric and backfilled and compacted with ¾-1” minus clean drainage rock.

• Design the west bridge end front face bin wall abutment to be 10 inches higher than the existing ground, Elevation 98.4 ft. The front face of the west abutment shall be set back 9 ft. from the top bank edge at the proposed bridge crossing site. The channel banks are composed of highly erodible soils, and the additional bridge length will ensure the safety and longevity of the abutments and bridge structure.

• Design the east bridge end front face bin wall abutment to be 2 ft. high. This front wall face shall set back approximately 13.5 ft. from the top of the stream bank.

• Backfill the geotextile fabric lined abutment bin walls with compacted ¾ to 1 inch minus TDOT clean stone.

Figure 10: Series of Illustrations of Sutter Wall abutment system and the 120 lb. bumpers that are earth anchored into the ground to install the fiber glass plate for a 40 ft. long FRP sloped end bridge on a bicycle trail at Land Between The Lakes, KY.

Figure 11: Example of a 55 ft. long FRP sloped end bridge being set on Sutter abutments on the Yellow Creek Trail of the LBJ Grasslands in Texas.

VI. Permits

• The Huntsville C-57 FRP trail bridge will be constructed outside the flood plain and is not over navigable waters. No permits are required for this structure.

VII. Special Requirements

• Potential use for large excavator to assist construction team to lift and move the constructed FRP bridge frame across the drainage to set on the elevated abutments.

VIII. Attachments

• Preliminary Bridge Site Plan and Profile View of Proposed Bridge

• Soil Series – Information Sheet – Proposed Mtn. Bike Trail Cmpt. 57/Sam Houston NF

• Huntsville C-57 Trail Bridge Crossing vicinity map

Contact for Additional Information:

Jerry D. Barrow Civil Engineer USDA FS Trails Unlimited Enterprise Team—(Retired on Contract) Jbarrow1314@gmail.com 423-479-6492 Office 423-650-9742 Cell mailto:Jbarrow1314@gmail.com

ATTACHMENT IV

C-57 BIKE TRAIL DRAWINGS

SUBMITTED

REVIEWED

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UNITED STATES DEPARTMENT OF AGRICULTURE

FOREST SERVICE

SOUTHERN REGION 8

NATIONAL FORESTS & GRASSLANDS IN TEXAS

SAM HOUSTON RANGER DISTRICT

TRAIL BRIDGE CONSTRUCTION PLANS FOR

HUNTSVILLE C-57 BIKE TRAIL BRIDGE

PROJECT SITES

I/' PROJECT NAME

DESIGN: JERRY BARROW 10 JULY 2014

DATE

INDEX

VICINITY MAP - HUNTSVILLE C-57 BIKE TRAIL BRIDGE ________ 2

PLAN & PROFILE HUNTSVILLE C-57 BIKE TRAIL BRIDGE_ _ _ _ _ _ _ _ 3

55 FT SLOPED END FRP TRAIL BRIDGE PLANVIEW _ _ _ _ _ _ _ _ _ _ 4

55 FT SLOPED END FRP TRAIL BRIDGE TYPICAL SENTIONS_ _ _ _ _ _ _ 5

TURF BLOCK & ABUTMENT DETAILS ______________ 6

SUTTER RETAINING INSTALLATION DETAILS 7-8

OBJECT MARKER DETAILS _________________ g

PROJECT LOCATION

� REVISION DATE �

10 JULY 2014

DRAWING NO.

DRAWN: MARCIA O'LOUGHLIN 10 JULY 2014 HUNTSVILLE C-57 BIKE TRAIL BRIDGE

DATE SHEET

CHECKED: JAMES S. GROENIER 9 JULY 2014

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