Publications & Reports

Ross Valley Flow Reduction Study Report
Publication Date
Document Type
Watershed Reference


The Ross Valley Flood Protection and Watershed Program (Program) was initiated after the devastating floods that occurred in Ross Valley during December 2005. The Program is a regional effort led by the Marin County Flood Control and Water Conservation District (District) Flood Control Zone 9; the Towns of Ross, San Anselmo, and Fairfax, California; and the City of Larkspur, California. The primary goal of the Program is to substantially reduce the frequency and severity of flooding. Secondary goals are to restore natural hydrological and ecological functions to creeks, and to enhance opportunities for public enjoyment within the watershed.

The Program ultimately will provide 100-year flood protection for the citizens of Ross Valley, and will be implemented in phases. The full Program, described in the Capital Improvement Plan Study for Flood Damage Reduction in Flood Zone 9/Ross Valley (CIP), includes five detention basins and more than 180 channel improvement measures, including bridge replacements, spread throughout the watershed that collectively, and in concert with improvements by the U.S. Army Corps of Engineers (USACE) to Unit 4 of its Corte Madera Creek flood control project, will provide an approximately 100-year level of flood protection.