Project Location: This crossing is located on Road 31N31, a maintenance level 3 road that is valuable to the Shasta-Trinity National Forest. Tule Creek is a tributary to Hayfork Creek, Trinity River Basin, Shasta-Trinity National Forest, in Northern California
Link to the location of the remediated barrier in the CDFW Map Viewer (BIOS): https://map.dfg.ca.gov/bios/?al=ds69&col=pad_id&val=707854.
Passage Assessment Database ID: 707854
Project Description: The purpose of this project was to rehabilitate the Tule Creek culvert crossing sufficient to provide unrestricted passage for all aquatic species. The Tule Creek crossing is a large earth fill with a 72-inch x 115 ft multi-plate steel culvert. The road provides the administrative access into the area for fire suppression, resource protection and private property.
Pre-project conditions/barriers/challenges/background: Rehabilitation of the crossing was necessary because of its age (50+ years), it was undersized, and it formed a barrier to fish and other aquatic species, such as amphibians. The restriction and gradient of the old culvert increased the water velocity to the point that fish and other aquatic species were unable to travel upstream.
Project actions/deliverables: The 72-inch diameter corregated steel culvert was excavated and replaced with a 64-ft SPAN concrete bridge. The crossing was originally designed to pass a 25-year storm event and upgraded to pass 100-year storm flows. About 2,000 cubic yards of fill were removed from the existing cossing and placed in a stable waste area. The outlet had scoured a deep hole that, during low flows, allows the water level to be about 3 feet below the bottom of the pipe. The structure was a barrier to fish migration in Tule Creek, a tributary to Hayfork Creek near Hayfork, CA.
Fish benefits/ecological value (i.e., species affected): The following fish species will now have unrestricted access through the crossing: steelhead, resident rainbow trout, speckled dace, Pacific lamprey, Pacific Giant salamanders, foothill yellow-legged frog.
Other benefits (flood control, utilities, wildlife connectivity, etc.):
Reduce risk of crossing failure and delivery of fine sediment to downstream critical habitat for coho salmon and steelhead trout
Amount of habitat made available as a result of project implementation: About 2 miles
Project partners: Shasta-Trinity National Forest and KLM Construction Ltd.
Project cost: Planning and permitting: $4,000; Construction/materials: $280,000; Inspection: $10,000. Total: $294,000
Funding sources: US Forest Service
Project end date: July 2005
Monitoring and evaluation:
Initial performance standards or goals: Remove an aging, undersized road crossing to improve access to spawning and rearing upstream fish habitat and connectivity for amphibians.
Did the project make a difference, and if so, how? Instream turbidity and suspended sediment data collected during implementation show that construction activities measurably increased instream fine sediment. Downstream measurements show that levels returned to background within ¼ mile of the site. No turbidity or suspended sediment increases were measured three miles below the site during project activities. Measurable incision of the stored sediment upstream of the road-stream crossing occurred, but was considered minor compared to the amount predicted to mobilize without grade control structures.