Lake Tulloch, Recreational reservoir in Copperopolis, United States.

Lake Tulloch is a reservoir on the Middle Fork of the Stanislaus River in Tuolumne County, California, formed by Tulloch Dam, part of the Tri-Dam Project. The dam's downstream face is clad in light tan concrete panels, with a flat-roofed powerhouse with rows of small square windows at its base where water exits. The lake covers 1,260 acres at about 504 feet elevation.

The lake began in the 1880s when a settler acquired water rights and transformed an old mining channel into an irrigation source. This change supported farming across the region for generations.

Lake Tulloch is one of the few California lakes with private shoreline houses, and access is limited to residents and guests registered at the South Lake Tulloch RV Campground and Marina. That campground has a restaurant, general store, gas dock and boat rentals. Anglers catch rainbow trout, brown trout, largemouth and smallmouth bass, catfish, crappie and bluegill.

Public access to Lake Tulloch is limited to private shoreline residents and guests registered at the South Lake Tulloch RV Campground and Marina. That campground has a restaurant, general store, gas dock and boat rentals. The lake sits at about 504 feet (154 m) in elevation near Copperopolis.

Lake Tulloch is one of the few lakes in California with privately owned shoreline houses, and since it stopped offering public recreation, only residents and guests registered at the South Lake Tulloch RV Campground and Marina can reach the water. That campground also has a restaurant, general store, gas dock and boat rentals.