Water Sources

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All of Louisville’s water supplies are from surface water that are diverted from two watershed basins: South Boulder Creek and the Colorado River.  The majority of supply is from South Boulder Creek that can be stored in several locations: (Marshall Lake, Harper Lake and Louisville Reservoir) or delivered directly to the two water treatment plants. 

To provide a more reliable system, Louisville is also a participant in Northern Water Conservancy District’s Colorado-Big Thompson (C-BT) project and the Windy Gap project.  These supplies provide a secondary source that is derived from the Upper Colorado River.  Supplies are conveyed under the Continental Divide to Carter Lake and the soon to be constructed Chimney Hallow Reservoir.  When needed, water from these locations is delivered to Louisville by means of the Southern Water Supply Pipeline (SWSP).

These supplies and water rights provide about 5,000 acre-feet of water.  An acre-foot is a measurement of volume that equates to approximately 326,000 gallons.  A typical Louisville home uses about 0.4 acre-feet per year.

As a limited resource, the City offers several Water Conservation programs to promote efficient and effective use of our water supplies.

If you would like more information about the water supply, please contact Cory Peterson at 303.335.4610.