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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 2019. Construction is anticipated during spring and summer 2020.

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 include invasive species removal and improvements to the existing dirt trails in the Oak Grove Nature Reserve.

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. Subsequently, a new CEQA Initial Study/Mitigated Negative Declaration (IS/MND) document for this reduced project was issued for public review from December 17, 2018 to January 22, 2019. The Final CEQA IS/MND was accepted by the Zone 7 Board on February 20, 2019. Zone 7 is currently applying for environmental permits and finalizing the design. Construction is planned for spring and summer 2020.

View the December 5, 2018, public meeting presentation.

Arroyo Mocho Medeiros Reach Floodplain Reconnection Project: Final Initial Study/Mitigated Negative Declaration

Now Available