Road B at Salt Hollow Creek Culvert RSP Bank Reinforcement

The Road B at Salt Hollow Creek Culvert RSP Bank Reinforcement project, managed by the Mendocino County Department of Transportation, focuses on stabilizing the outlet of an existing culvert crossing at Road B, CR 231A, Milepost 0.69 in Redwood Valley, California. The project addresses roadway embankment instability and localized settlement caused by the failure of previous outlet wingwalls and concreted rock slope protection. The scope of work involves removing failed wingwalls, concreted rock slope protection, and a temporary emergency sandbag wall to make way for the construction of engineered rock slope protection walls. Specifically, a 20-foot by 15-foot wall will be installed on the left bank and a 25-foot by 15-foot wall on the right bank, both of which will be keyed into the embankments and underlain by a granular filter layer. The project is designed to provide interim stabilization and maintain safe public access until a full culvert replacement can be implemented. Construction is scheduled to occur during the dry season to minimize environmental impact, with heavy equipment operating primarily from the roadway. The project includes the implementation of biological resource, water quality, and erosion control measures. This effort is classified as a categorical exemption under California Code of Regulations Section 15301, as it constitutes repair and maintenance of existing infrastructure without expanding its use. The project is overseen by the Director of Transportation and supported by environmental compliance specialists.