Lake Anza is a recreational swimming reservoir in Tilden Regional Park, which is located in the Berkeley Hills above Berkeley, California. The lake was created by the construction of the C L Tilden Park Dam in 1938. It was named by the East Bay Regional Park Board in honor of Spanish explorer Juan Bautista de Anza. The lake area includes amenities such as changing rooms, bathrooms (toilets), and large parking areas. There are areas around the lake reserved for waterfowl, and other areas for dogs.