Wilson Creek Restoration and SPGA Wall Project

The Wilson Creek Restoration and SPGA Wall Project is a Caltrans District 1 initiative to stabilize a 0.26-mile segment of U.S. Highway 101 in Del Norte County, California, between postmiles 12.69 and 12.95, near Klamath. The project centers on constructing two engineered retaining walls to address slope instability: a 695-foot-long, 55-foot-high soldier pile ground anchor wall along the western shoulder and a 595-foot-long, 19-foot-high soil nail wall on the eastern shoulder, both extending from the northern end of the Wilson Creek Bridge. Construction is scheduled to begin in 2029 and is expected to span approximately three years, with work including hazardous material handling such as lead-based paint and treated wood waste, stormwater management under California’s General Permit, and full revegetation of disturbed areas to restore ecological function. Environmental compliance is central to the project, requiring adherence to Caltrans Standard Specifications including SSP 36-4 for lead residue, SSP 84-9.03B for traffic striping, and SSP 14-11.14 for treated wood waste, as well as mitigation for endangered and sensitive species identified in consultations with USFWS, NMFS, and CDFW. All activities must comply with the Stormwater Pollution Prevention Plan, Transportation Management Plan, and Best Management Practices for dust, track-out, and erosion control, while ensuring continuous access for pedestrians and bicycles. Inspection and acceptance occur on-site under Caltrans oversight, governed by state environmental and safety regulations including CARB emissions standards and Cal/OSHA requirements. The project is classified under NAICS code 237310 for heavy and civil engineering construction, and the planning phase is tied to a federally declared winter storm event from 2019, with environmental documentation finalized through the California Environmental Quality Act process. Key contacts for environmental coordination include Terra McAuliffe and Emiliano Pro, with no formal contract value, invoicing method, or payment office details provided in the available documentation.