Donahue Street Portable Pump Station

active

The functional benefit will be a reduction in the depth and duration of flooding on Donahue Street and the Highway 101 ramps (which are owned and maintained by California Department of Transportation). The improvements will allow vehicle access following storms to return faster than before. However, the portable pump station’s system will not be large enough to fully prevent roadway flooding at the location after storms and high tides. This is a first step in a series of projects in Marin City, and more improvements are planned to further reduce the flooding on Donohue. This project includes constructing two temporary, underground sumps with two trailer-mounted portable pumps, and connecting the existing storm drainage system along Donahue Street to the sumps via new drainage structures and pipes. The portable pumps are intended to be deployed prior to significant storms and pump stormwater through two pipes approximately 1,400 feet to the Marin City Pond. The stormwater will then be discharged from the pond, located northeast of the Gateway Shopping Center, into Richardson Bay. The portable pump station project is designed to reduce the severity of localized flooding along Donahue Street, a key thoroughfare in the unincorporated neighborhood that has been chronically impacted by roadway flooding during storms and high tides. Marin City, which is adjacent to Richardson Bay, often becomes flooded during heavy storms, especially when those storms coincide with high tides. The localized flooding impacts Donahue Street and impedes access to the Highway 101 ramps, restricting mobility for Marin City residents and visitors who must wait until the stormwater slowly drains out to Richardson Bay after a storm.