Chatfield State Park is a state park located in Douglas and Jefferson counties of Colorado, United States. The park centers on Chatfield Reservoir, a 1,423 acre surface area lake fed by the South Platte River and two other creeks, including Plum Creek.Reservoir Expansion ProjectThe Chatfield Reservoir Reallocation Project, slated to begin in fall, 2017, will create an additional 20,600 acre feet of water storage in the reservoir, raising its level by about 12 feet. The project will require that some of the park's facilities be moved back from the new, higher lake levels.WildlifeOver three hundred bird species both migrant and resident frequent Chatfield. Also a variety of mammals roam the park, including whitetail and mule deer, coyote, red fox, cottontail rabbit, prairie dogs and weasels.Audubon Center at Chatfield State ParkThe Audubon Society of Greater Denver operates the Audubon Center at Chatfield State Park, a nature education center that offers classes, workshops and lectures for all ages, with an emphasis on children and families.