Mile Square Park Lake is located at 6801Euclid Ave. Fountain Valley, CA 92708. The California Department of Fish and Game stocks this lake with Rainbow trout from late fall to the early spring and Channel Catfish from the late spring to the early fall. There are also Bluegill, Carp, and a few Largemouth Bass in this lake. The smaller of the two ponds receives the majority of fish stocked by the California Department of Fish and game. Remeber only take the fish if you are going to eat them, otherwise please practice catch and release and don’t litter!!!