Zone 7’s Arroyo Mocho Medeiros Reach Project (Medeiros Project) is an integral component of our regional flood protection strategy for Arroyo Mocho within Zone 7’s service area.
The project seeks to reduce flood risk by restoring flow to the natural floodplain in the Oak Grove Nature Reserve by lowering the trail. The lowered trail will allow high flows to overtop the trail and enter Oak Grove Nature Reserve. These types of storms are expected to occur in the 10-year to 25-year frequency range.
This project is designed to improve water quality, taste and odor at the aging Patterson Pass Water Treatment Plant (PPWTP). The project will also increase and stabilize the treatment plant’s production capacity from 12 to 24 million gallons per day, as well as add clearwell storage, new filters, renewal replacement and some additional plant rehabilitation. Decades in the planning, this project highlights the agency’s efforts in long-term planning, fiscal responsibility and commitment to water quality and public health.