Brannan Island State Recreation Area, State recreation area in Sacramento County, US

Brannan Island State Recreation Area is a 329-acre recreation area within the Sacramento-San Joaquin River Delta featuring islands, waterways, and marshes that support diverse animal habitats. The park includes 140 campsites, a boat launch, and areas for swimming, fishing, and windsurfing.

Brannan Island State Recreation Area was established as a California state park unit in 1952, setting aside 329 acres of Delta waterways, islands and marsh. California State Parks closed the park on April 1, 2022, while seeking a new operator; it reopened partially from June to September 2022 and fully on December 1, 2022, run by Park Delta Bay, a nearby resort.

The visitor center, open weekends and by arrangement, holds displays on the cultural and natural history of the Delta, including a large interactive map of the San Francisco Bay Area and the Delta. Canoe tours of the meadows of Delta Meadows River Park, near the town of Locke, can be reserved on weekends in spring and fall through Brannan Island SRA.

The park sits between Rio Vista and Isleton in Sacramento County, northeast of San Francisco Bay. Seven Mile Slough has a swim beach with lifeguards from Memorial Day through Labor Day, plus picnic tables, barbecues and drinking water; restrooms there have flush toilets and cold outdoor showers. The Ramadas group picnic area and Seven Mile Slough day use area close at sunset, and Windy Cove closes at the hour posted on its entrance road.

Frank's Tract, reached by way of the San Joaquin River, is a protected wetland marsh where beaver, muskrat, river otter and mink live alongside 76 species of birds. Brannan Island's park rangers also manage Delta Meadows River Park near the town of Locke, and weekend canoe tours of those meadows can be reserved through Brannan Island in spring and fall.