Barr Lake State Park is a Colorado state park established in 1977 in Adams County near Brighton, Colorado, USA. The 2,715-acre (10.99 km2) park has 12 miles (19 km) of trails, including an 8.8-mile (14.2 km) trail that circles Barr Lake. Fishing and boating are allowed in the northern half of the park. The southern half is a wildlife refuge, with several wildlife viewing stations and a nature center. Numerous bald eagles spend the winter at Barr Lake and one pair nests every year. The park is popular with birders; over 350 species have been observed.