California /

Contra Loma Reservoir

Reservoir in California · 66 acres · near Antioch

Contra Loma Reservoir has 1 boat ramp listed as public.

Golden mussels

California Department of Fish and Wildlife has detected golden mussels (latest detection 2025) in this water. Clean, drain and dry your boat, trailer and gear before you leave, and do not move water, plants or live bait to another water.

California Department of Fish and Wildlife · checked October 18, 2026

Past algal blooms

Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2020 to 2022, 2025 and 2026.

state reports compiled by U.S. EPA · checked October 18, 2026

Launches