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Boulder Reservoir


Boulder Reservoir Labyrinth spillway

The decision to build Boulder Reservoir was made 16 years after the formation of the Northern Colorado Water Conservancy District.

Initially, the city of Boulder opted to exclude itself from the District. However, post-World War II growth and a drought in the late 1940s convinced city officials of the need for additional water.

In January 1953, after a feasibility study by Boulder and extensive discussions with the District, the Board of Directors voted to include the city within the District. 

Under the agreement, Boulder consented to pay back taxes and finance construction of Boulder Reservoir. The District agreed to operate, maintain and repair the reservoir and retain a right to one-third of the operating capacity. Boulder chose to manage recreation at the site. 

The plan depended on a million dollar bond issue, which Boulder voters approved June 9, 1953. 

Boulder Reservoir was completed in April 1955. Without it, the city had a water supply sufficient for only 24,000 people.

Today, Boulder Reservoir provides water for agricultural as well as municipal use. An estimated 175,000 people visit the reservoir each year to fish, boat, swim and picnic. It is also home to the largest guarded swimming area in the state. 

Boulder Reservoir by the Numbers
Map of Boulder Reservoir