DESCRIPTION
The problem is a 33% passable fish barrier under Kirkpatrick Road at road mile 2.05 at the mouth of Damon Creek on the Humptulips River at river mile 10.3. The degraded watershed process this project addresses is fish migration access to upstream spawning and rearing habitat. The solution is to remove the barrier and replace it with a structure that is passable to all species and life stages of salmonids and other aquatic species to access 5.82 miles in Damon Creek. This grant application is for design and permitting of the barrier correction. These materials will be used to apply for subsequent grants to fund project construction.
A barrier correction was designed and permitted to correct the 33% passable fish barrier under Kirkpatrick Road at road mile 2.05 at the mouth of Damon Creek on the Humptulips River at river mile 10.3. Geotechnical analysis was completed and the design was developed to address soil conditions at the site. The designed correction for this fish barrier culvert is a structural plate arch culvert 35' 6" wide with a 21'9" rise, 80’ long. The culvert will be a bottomless arch, made of 5 gauge, galvanized, deep-corrugated steel structural plate, and assembled in place on the poured footings in the road excavation based on the following design considerations and analyses. A final design report was completed. All necessary permits were obtained, including an HPA from WDFW and a Nationwide 27 from the Corps of Engineers (COE). This project is ready to construct once funds are obtained through future grants.
