Marin City Pond Flood Reduction Project

active

The project team developed a new design with a pump station  and floodwall  at the edge of the pond that uses the existing pipe under US 101 to drain flood waters. These proposed improvements reduce flood risk under current conditions and expected sea level rise conditions. The initial plan was for a trenchless installation of the culvert. After further geotechnical analysis in August 2021, this approach was found to be technically infeasible. Issues around the subsurface soils make trenchless installation risky and prone to failure. The purpose of the Marin City Pond Flood Reduction Project is to make several improvements to the stormwater drainage and pond system . This includes a new pump station at the pond to improve drainage out of the pond to the bay.