Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
MEN 101 Roadway Stabilization Project
NOE - Notice of Exemption
Caltrans is proposing to repair storm drainage on US Route 101 near the unincorporated community of Ridge in Mendocino County. Stormwater runoff from multiple rain events between Jan 2017, and April 2017 saturated the roadway prism due to a pair of defective culverts and a roadside ditch. The saturated roadway caused a landslide that severely damaged pavement on the southbound shoulder and southbound first travel lane. Additional land movement following the Redwood Valley Fire that occurred in Oct 2017, exacerbated the damage. As a public safety measure, Caltrans subsequently closed the southbound shoulder and travel lane. Rain events from the approaching rain season will likely lead to additional slides or potentially cause a complete roadway failure that could shut down US 101 or compromise public safety.
This project involves restoring two existing culverts and an existing roadside drainage feature by adding scour protection and replacing, when necessary, to decrease future degradation with de minimus increase in fill. The project will not result in an expansion of the existing use.