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Kapowsin Tributary Culvert Replacements Land Owner: IP Pacific Timberlands Location: Tributary to Lake Kapowsin, Pierce County, Washington Sponsor: Pierce County Conservation District Contractor: CeCon Corporation, Tacoma, WA Project Cost: $44,000 (Both culverts)
Project Summary: Chinook Engineering provided design assistance and construction management for this project involving the replacement of two undersized culverts on a tributary to Lake Kapowsin. The first culvert was replaced with a new 7 foot diameter pipe at a zero percent slope beneath the IP Pacific mainline logging road. The second culvert, further downstream on an adjacent service road, was replaced by a 9 foot diameter pipe installed on a 3 percent slope using the WDFW stream simulation design approach. The original culvert at this location was perched and therefore a complete barrier to upstream fish migration. With larger pipes in both locations and a resultant reduction in water velocities, fish access to upstream habitat is now possible.
First section of the 7 foot diameter pipe be lowered into the trench on the mainline crossing.
Upstream photo of completed mainline crossing.
First section of the 9 foot diameter pipe be lowered into the trench on the spur road crossing.
Downstream photo of completed spur road crossing
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Copyright, 2008. Chinook Engineering For question or comments regarding this page please contact: jay@chinook-engineering.com Last modified: March 21, 2008
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