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Water Supply

Where does the water come from?

Broomfield's water supply originates on the western slope of Colorado and is transported through the Colorado-Big Thompson (CBT)/ Windy Gap system under the management of the Northern Colorado Water Conservancy District, and is stored on the eastern slope in Carter Lake in Larimer County.

 Carter Lake  View Presentation to City Council (02.27.07) by Mike Bartleson, former Public Works Deputy Director, on the history and future of water.

The Windy Gap Project consists of a diversion dam, a pumping facility, and a pipeline to Lake Granby. The CBT system includes a total of ten reservoirs, thirteen dams, six power plants, three pumping plants, and associated canals and waterways. The Alva B. Adams tunnel is a means of conveying this collected water 13.1 miles through the Continental Divide to the eastern slope. After leaving the tunnel, the water falls through six power plants and eventually into Carter Lake. A 32-mile water conveyance pipeline from Carter Lake to the Matthew D. Glasser Reservoir supplies the water used by the City’s treatment facility.


 Glasser Reservoir Inflow  Glasser Reservoir


Broomfield also purchases potable drinking water from the Denver Water Board.

For additional questions, please call 303.464.5600 or email