📋 Tender Overview
Project Limits: Mileposts 3.24 to 3.26
Federal Classification: Rural Minor Collector (08)
Project Description: Replace existing 18-inch concrete pipe
with a new culvert to allow for high flows and fish passage.
Basis for Project: Existing culvert is undersized for large
storm flows and fish passage. The culvert has a steep slope
blocking fish passage. In addition the culvert is prone to plugging
and is six feet below the roadway surface making maintenance
difficult.
Environmental/Safety Considerations: The existing culvert is listed on the WDFW Fish Passage website
as a fish passage barrier. This culvert conveys an unnamed tributary to Arkansas Creek, which is approximately
800 feet downstream of the culvert. WDFW’s SalmonScape website does not show any priority species in this
stream but shows a presence of Coho, Chum, and Steelhead and the potential presence of Chinook in Arkansas
Creek. Prior to construction potential fish and wetland impacts will be reviewed and any potential negative
impacts will be mitigated. In-stream work will need to be constructed during the approved fish window with
safe fish handling techniques employed.
Without this project the culvert could collapse causing extensive roadway damage or plug causing flooding.
Either of these situation is potentially danagerous to the travelling public and first responders.
Funding Sources: This project is funded with local road funds.
