Project Location: Little Browns Creek is a tributary to Weaver Creek, a major tributary to the Trinity River below Lewiston Dam. The project is located in Section 28 of T34N R9W MDBM and is accessible by taking Highway 3 north out of Weaverville from Highway 299 for approximately 6 miles and turning left at Roundy Road (Trinity County Road #232). The project site is located just before the intersection of Roundy Road and North Roundy Road.
Link to the location of the remediated barrier in the CDFW Map Viewer (BIOS):
Passage Assessment Database ID: 705975
Project Description: The purpose of this project was to provide for full passage of all life stages of coho salmon and steelhead to the natural limits of anadromy in Little Browns Creek by removing the three culverts at the Roundy Road Crossing of the creek that were a complete barrier. Additional objectives included eliminating the potential for 1,400 cubic yards of accumulated sediment to deliver to the downstream reaches of the creek and connected downstream watersheds, including the Trinity River; decreasing the potential for upstream headcutting; improving the flow capacity of crossing at Roundy Road; and, restoring natural stream function upstream of the crossing.
Pre-project conditions/barriers/challenges/background: The old culvert structures did not allow for the passage of bedload and debris
associated with the high flows in Little Browns Creek and flooding at the site, as well as upstream sediment accumulation, was a common occurrence during winter storm events.
Project actions/deliverables: The three culverts were removed and replaced with a 30-foot long concrete cast-in-place bridge, implementing a full stream simulation design through the road crossing.
Fish benefits/ecological value: Provide full passage for all life stages of coho salmon and steelhead.
Other benefits: The full stream simulation design complies with the NMFS Guidelines for Salmonid Passage at Stream Crossings (September 2001), allowing for the100-year flood flows and associated bedload and debris to pass safely through the replacement structures. This treatment has prevented future culvert failures, reduced maintenance costs associated with storm flows and culvert plugging, and eliminated the potential for delivery of approximately 2,000 cubic yards of sediment into the downstream reaches of Little Browns and Weaver Creeks as well as the Trinity River.
Amount of habitat made available as a result of project implementation: 3 miles.
Habitat quality and type characterization: Excellent quality spawning and rearing habitat for coho salmon and steelhead exists both below and above the project site.
Project partners: 5 Counties Salmonid Conservation Program, State Coastal Conservancy, California Department of Fish and Wildlife, Trinity County Department of Transportation, US Fish and Wildlife Service, NOAA, Trinity River Basin Fish and Wildlife Restoration Program
Project cost: $507,003
Project start date: 2004
Project end date: 2008
Monitoring and evaluation:
Did the project make a difference, and if so, how?
For more information on the project, read the final report.