Crystal Lake is a lake in Southern California, United States. It is snow and spring fed and has no other artificial means of being replenished. Geographically it sits in a bed of decomposed granite and a fissure at its bottom depletes its water during and after the rain and snow season. Because of this its depths vary dramatically from a mean low of 35 feet (10.7 m) to a probable high of 150 feet (45.7 m), depending on seasonal precipitation.
The Lake is settled neatly in a bowl below the granite crags surrounding Mount Hawkins. In its past it had amenities for picnickers, anglers, and swimmers. But in 1969 a severe rainy season flooded the privies on the shore line and the water became contaminated to the point that the swimming facilities were closed. Subsequent rainy seasons flooded the small cabin that served as a summer residence for concessionaires who operated a snack stand from the lower level and patio. By 1990 the facility was demolished.