Section 401 Water Quality Certification Public Notice

Big Rock Trail Stream Crossing Replacement Project


The San Francisco Regional Water Quality Control Board is currently reviewing an application for the following project for water quality certification under Section 401 of the Clean Water Act. We encourage public comments on the proposed work, which will be considered in the decision on certification. You may submit comments on this project to the staff member below.


Project Name:

Big Rock Trail Stream Crossing Replacement Project
City/County:

Unincorporated, Marin County
Comment Period:

5/8/2025 - 5/28/2025
Project Description:

Project implementation will improve trail sustainability and visitor safety by removing the threat of a potential stream crossing failure and damage to downstream habitats, maintaining public access with the least environmental impact, and restoring habitat lost by the original placement of culvert and fill within the ephemeral stream channel. The project will result in beneficial effects to the ephemeral stream and Miller Creek by reducing existing and future sediment delivery and restoring continuity of the channel within the project area.
Project Files:

Contact Staff for files
Staff Contact:

Kelsey Kruger
(510) 622-2357
Water Quality Control Board
1515 Clay Street, Ste 1400
Oakland, CA 94612