into Flatiron via a pump-generating unit. Water flows south from Carter Lake into the St. Vrain Supply Canal, which provides water to the Little Thompson River and Saint Vrain Creek. From the end of the St. Vrain Canal the Boulder Creek Supply Canal extends southward to Boulder Creek, and the South Platte Supply Canal extends northeast from there to the South Platte River. See also The Grand Ditch, an 1890s diversion project List of largest reservoirs of Colorado References Note: the "Request rejected" archive links aren't working as of 6/15/2022 External links The Colorado–Big Thompson Project, US Bureau of Reclamation A River Routed Under the Mountains. June 9, 2022, NASA Earth Observatory, features satellite photos of many features of the project. The Great Plains Region, US Bureau of Reclamation The Eastern Colorado Area Office, US Bureau of Reclamation Horsetooth and Carter Lake reservoirs, US Bureau of Reclamation "Man-made River Pierces The Rockies" , September 1947, Popular Science U.S. Department of the Interior: Water and Power Resources Service, Project Data, pps 251-292. United States Government Printing Office, 1981. Buildings and structures in Colorado Colorado River Energy infrastructure in Colorado Interbasin transfer United States Bureau of Reclamation Water supply and sanitation in the United States Hydroelectric power plants in Colorado