Brannan Island has 102 family campsites in two loops; the Cottonwood loop and the Willow loop. Each campsite has a fire ring, picnic table and ample room for several tents on the surrounding lawn areas. There are 13 recreational vehicle sites near the boat berthing basin. These thirteen sites come with a boat berth for the same fee as a regular campsite. Near the berthing area and included in the price of a boat berth are several walk-in campsites. The campgrounds all have restroom facilities with pay showers nearby. All the family and recreational vehicle sites accommodate up to eight people and three vehicles. Six group campsites are located in the north section of the park, near the park's day use area. The group sites can accommodate 30 people and 10 vehicles per site. Near the park entrance is the Rally Site which can accommodate large groups of recreational vehicles or groups desiring a large area for their group camp-outs.