Folsom Lake

Is Folsom Lake good for swimming?

The reservoir covers about 46 square kilometres when full and sits at roughly 142 metres above sea level. California State Parks manages recreation on the shoreline while the reservoir itself is operated for water supply and flood control, which is why the level follows an annual curve rather than staying put.

Granite Bay, on the western shore, is the largest developed day-use area, with a sand beach, a paved boat launch and parking that fills early on summer weekends. Smaller unmarked beaches such as Pit Stop Beach and Laurel Beach sit along the shoreline trails and have no facilities at all.

Level is the thing to check before driving out. The California Data Exchange Center reported 409.86 feet and 448,778 acre-feet of storage on September 9, 2026. As the reservoir draws down through late summer, the beach at Granite Bay widens and the boat ramps get progressively longer, and in deep drought years some ramps close entirely.

The park charges a vehicle day-use fee, and dogs are allowed in parts of the recreation area but not on the developed swim beaches. Because the reservoir is a drinking-water source and the shoreline is granite and dirt rather than groomed sand, footwear helps at the smaller access points.