Your WaterFlood and Stream ManagementWatershed and Environment

Zone 7’s Arroyo Mocho Medeiros Reach Project (Medeiros Project) is an integral component of the regional flood control strategy for Arroyo Mocho in Zone 7's service area. The project is located within an approximately 40-acre area along the 0.7-mile Medeiros Reach of Arroyo Mocho in the City of Livermore. The Medeiros Reach of Arroyo Mocho is located between Arroyo Road and Holmes Street, south of College Avenue. The project would occur on property owned by Zone 7.

Project Schedule: Project planning, design, and permitting will continue through spring 2019. Construction is anticipated during 2019.

Project Contact: Emily Moshier, Associate Engineer (925) 454-5035


Zone 7 reduced the scope of the Medeiros Parkway Project in response to public comments received during the initial CEQA public review in summer 2018. The smaller project now proposed 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 would allow high flows (during storms larger than once every 10-year to 25-year frequency) to overtop the trail and enter Oak Grove Nature Reserve, which is an existing basin-like topography due to excavation related to past gravel quarry operations. The current project doesn’t propose any extensive excavation in Oak Grove Nature Reserve. Additional project elements, contingent on grant funding, may include invasive species removal and improvements to the existing dirt trails in the Oak Grove Nature Reserve. Zone 7 is preparing a new CEQA document for this reduced project and anticipates releasing it for public review in December 2018 and January 2019. Construction is planned for summer 2019. A public meeting on the revised design was held December 5, 2018, 6:00 – 8:00 p.m. in Zone 7’s Board Room at 100 North Canyons Pkwy., Livermore.

View the December 5, 2018, public meeting presentation.