Barr Lake State Park was established in 1975. Barr Lake is 1,835 acres and 30,057 acre-feet at fool pool with a maximum depth of 32 feet at the Dam. The lake has a water retention time of about 8 months. The water is used for agricultural irrigation, domestic water supply, aquatic life, and recreation. The park is known for birding. Over 350 bird species have been seen at Barr Lake. The water comes from the S. Platte River. The watershed includes most of the urban area around Denver. Approximately 2.5 million people live just upstream of Barr Lake. Water quality continues to improve, and we encourage everyone to do their part in keeping nutrients out of the water.