Brannan Island State Recreation Area in California, USA - map and visitor information

Research checked: 2026-10-30. Check linked official notices before travel.

Brannan Island State Recreation Area gives you land access to California’s Sacramento–San Joaquin Delta near Rio Vista. A shoreline picnic or birdwatching visit works without a boat. Swimming and launching require more planning because the park has tides, wind and specific vessel exclusions.

See the Delta from the shore

Start with Seven Mile Slough for picnic facilities beside the water. For a boating trip, mark the powerboat exclusion zones before launching. The sheltered-looking shore is part of a tidal waterway, so choose activities for your group’s experience rather than appearance alone.

Know before you go

Fees, hours, and seasonal access

Allow for tides, wind and unguarded water

Lifeguards do not supervise the swimming area. Keep clear of unstable sandy cliffs. Wind and changing tides can complicate a return to shore. Review the vessel restrictions: powerboats cannot enter the designated Seven Mile Slough stretch or go within 50 feet of the Three Mile Slough Sand Spit.

Follow day-use and pet restrictions

Alcohol is prohibited in day-use areas. Keep dogs under control on a leash no longer than six feet. Ordinary pet access is limited to paved roads, campsites and designated areas, including the picnic area north of the Seven Mile Slough restrooms. Beaches and trails are otherwise off limits to dogs, with the service-dog exception. Leave natural features undisturbed.

Arrange a group visit before traveling

Use the booking and service links on the official park page for reservation arrangements. The state park’s concessionaire is Park Delta Bay; distinguish its services from other Delta businesses.

Find the Highway 160 entrance near Rio Vista

Navigate to 17645 CA-160, Rio Vista, CA 94571. The park lies south of town in Sacramento County. Consult the official park map and brochure to distinguish picnic areas and water boundaries.

Nearby parks reached by road

Big Break Regional Shoreline in Oakley has road access at 69 Big Break Road and Delta exhibits. Its water has a blue-green algae danger advisory; choose the land-based visit. Bethany Reservoir State Recreation Area is another road option at 13638 Christensen Road near Byron. Check each destination’s gate hours before adding it to the day. Franks Tract requires water access, so it is not a road-stop alternative.

Choose a shore visit or a planned water outing

• Bring a picnic to Seven Mile Slough and finish before sunset.
• Watch backwaters for herons and sandpipers without approaching them.
• Use the designated swimming area only with your own water-safety plan.
• Check the vessel order before planning powerboat access.

Picnic facilities beside Seven Mile Slough

The day-use area has tables, barbecues, drinking water, flush toilets and cold outdoor showers. Confirm the facility you need before relying on it, especially for a group visit.

About this state recreation area

California State Parks includes Brannan Island within its Diablo Range District. Park Delta Bay operates it as a concessionaire. This management arrangement matters when arranging a service or group booking.

From a Delta island to a public park

The state acquired the recreation-area land in 1954, and it became a park in 1965. Its name recalls Sam Brannan, a supplier to gold seekers. Those dates refer to the park’s development, rather than the formation of the surrounding waterways.

Look across channels and backwaters

Gulls, terns and cormorants use open channels. Herons, rails and bitterns occupy quieter backwaters. A patient shore stop gives you a way to observe these habitats without entering them.

Contact

Call 916-777-4004 for access and facility questions. Ask about the specific day-use area you plan to use.