Emeryville Crescent State Marine Reserve is a marine reserve of California, United States, preserving marshland on the east shore of San Francisco Bay.

[1] The 103.5-acre (41.9 ha) marsh[2] stretches from the eastern approach of the San Francisco–Oakland Bay Bridge in Oakland to the foot of Powell Street in Emeryville.

[3] Temescal Creek drains into the marshes near the Emeryville–Oakland border on the eastern midpoint of the marshlands.

[2] The park is often used as a recreational area by local fishers and dog-walkers.

[2] The reserve is also noted for various problem areas such as unauthorized camping, petty littering, and dumping large articles of garbage such as TVs and refrigerators.