B08_Attachment_04_Photos_NOCA_SVR_MP8_SOW_Attachment_A-F.pdf
PDF 4 MB Posted
- Attached to
- NOCA - 8 MILE RIPRAP Federal contract opportunity
- Solicitation number
- 140P8326Q0019
About this file
This document is an attachment set containing existing conditions analysis and proposed work designs for a streambank protection project at Stehekin Valley Road (SVR) Mile Post 8, located along the Stehekin River in Washington State.
The existing conditions show significant erosion at the site, with a 45-foot eroded bank section and a larger 115-foot eroded bank section documented as of January 21, 2026. The cross-sectional survey indicates an ordinary high water (OHW) elevation of approximately 1,360 feet at an 8,000 cubic feet per second flow rate. Multiple existing bank barbs are present in the area, with one damaged structure noted, though no remediation work is planned for the damaged element. The proposed work involves installation of 160 linear feet of riprap along the eroded bank to stabilize the streambank and protect the adjacent roadway. The riprap installation will be paired with filter fabric placement and includes rebuilding 3 feet of road elevation at the SVR edge. The riprap sizing specifications require Class 6 material below the ordinary high water mark and Class 5 material above, with detailed gradation requirements provided in the attached specifications table. Design standards reference the Integrated Streambank Protection Guidelines from the Washington State Aquatic Habitat Guidelines Program (2002). A critical note specifies verification of riprap start and end locations with the park point of contact prior to construction commencement.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| B08_Attachment_02_Solicitation_Terms_Provisions_Clauses.pdf | ||
| B08_Attachment_05_Drawing_NOCA_SVR_MP8_SOW_Attachment_G.pdf | ||
| B08_Attachment_07_Price_Schedule_and_Forms_to_Submit_with_Quote.pdf | ||
| Sol_140P8326Q0019.pdf | ||
| B08_Attachment_03_Statement_of_Work_NOCA_352127_SVR_MP8_SOW_rev1.pdf | ||
| B08_Attachment_08_Technical_Info_Form-Past_Performance_Form.docx | DOCX document | |
| B08_Attachment_01_READ_ME_FIRST_-_FAQs.pdf | ||
| B08_Attachment_06_Wage_Determination_SAM.pdf |
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Text version
Existing bank barb locations
45 feet eroded bank
Base layer 2015 lidar
Damaged bank barb
A
A’
Reference ceder tree
Stehekin Valley Road (SVR) Mile Post 8 Existing Conditions 1/21/2026
Attachment A
115 feet eroded bank
Stehekin Valley Road (SVR) – Mile Post 8 Existing Conditions Cross Section
0+0
353020105 40 50 55 6045 65
SVR
OHW (~8,000 cfs) – Stehekin River Channel
Horizontal Distance (feet)
Elevation (feet)
Eroded bank
Hillslope
A A’
Attachment B
Proposed rip-rap 160’
Base layer 2015 lidar
A
A’
Notes:
1) Verify rip rap start and end locations with park point of contact.
Existing bank barb locations
Damaged bank barb (No work)
Reference ceder tree
Stehekin Valley Road (SVR) Mile Post 8 Proposed Work
Attachment C
Stehekin Valley Road (SVR) – Mile Post 8 Proposed Work Cross Section
0+0
353020105 40 50 55 6045 65
SVR – road built back out 3 feet
OHW (~8,000 cfs) – Stehekin River Channel
Horizontal Distance (feet)
Elevation (feet)
Filter Fabric
Hillslope
A A’
1:1 slope
Attachment D
INTEGRATED
STREAMBANK
PROTECTION
GUIDELINES
Washington State Aquatic Habitat Guidelines Program (2002)
Stehekin Valley Road (SVR) Mile Post 8
Attachment E
Sizing of Riprap and filler material to be Class 6 below OHW, Class 5 above.
Stehekin Valley Road (SVR) Mile Post 8
Attachment F
File details come from the government source that posted it. Updated .