Eleven Mile Reservoir

Eleven Mile Reservoir is a significant water management and recreational site located in Douglas County, Colorado, along the South Platte River. Constructed in the mid-20th century, the reservoir plays a critical role in supplying water to the Denver metropolitan area while also serving as a hub for outdoor activities. Its strategic location between Denver and the Front Range makes it a key component of Colorado’s water infrastructure, balancing ecological preservation with human needs. The reservoir spans approximately 1,300 acres, with a maximum depth of 60 feet, and is managed by the Denver Water Department. Its dual purpose as a water source and recreational area has made it a focal point for both environmental conservation and community engagement in the region.

The reservoir’s history is intertwined with Colorado’s broader efforts to manage water resources in a semi-arid climate. As urbanization in the Denver area accelerated in the 1950s and 1960s, the need for reliable water sources became urgent. Eleven Mile Reservoir was completed in 1963 as part of a larger initiative to expand the South Platte River Basin’s capacity, ensuring water security for growing populations. The project involved significant engineering, including the construction of a dam and spillway, which were designed to withstand extreme weather events. Over the decades, the reservoir has undergone periodic maintenance and upgrades, reflecting evolving standards in water management and environmental protection.

History

The origins of Eleven Mile Reservoir trace back to the mid-20th century, a period of rapid expansion in Colorado’s Front Range. As Denver’s population surged, the demand for water outpaced existing infrastructure, prompting the Colorado State Legislature to authorize the construction of new reservoirs. Eleven Mile Reservoir was one of several projects aimed at augmenting the South Platte River’s capacity, with its primary goal being to provide a reliable water supply for agricultural and municipal use. The reservoir’s design incorporated innovative techniques for the time, including the use of concrete-lined channels to minimize seepage and ensure efficient water distribution.

The reservoir’s completion in 1963 marked a milestone in Colorado’s water management history. It was named “Eleven Mile” due to its location approximately 11 miles east of Denver, a reference that has since become a defining feature of its identity. Over the years, the reservoir has adapted to changing needs, including the integration of fish hatcheries to support local ecosystems and the implementation of flood control measures. In the 21st century, it has also become a focal point for discussions about climate resilience, as droughts and shifting precipitation patterns have underscored the importance of sustainable water management.

Geography

Eleven Mile Reservoir is situated in a region characterized by rolling plains and the foothills of the Rocky Mountains, offering a unique blend of open landscapes and natural beauty. Its location along the South Platte River, which flows through the heart of Colorado’s Front Range, places it at the intersection of urban development and rural conservation. The reservoir’s elevation ranges from approximately 5,200 to 5,400 feet above sea level, contributing to a temperate climate that supports a diverse array of flora and fauna. Surrounding the reservoir are grasslands, riparian zones, and pockets of forest, creating a habitat for species such as elk, mule deer, and various bird species.

The reservoir’s physical dimensions and topography have shaped its role as both a water storage facility and a recreational destination. Its elongated shape, stretching over 13 miles in length, allows for a variety of water-based activities, from boating to fishing. The surrounding area includes several access points, trails, and picnic areas, making it accessible to visitors. Geographically, Eleven Mile Reservoir is part of the larger South Platte River Basin, which is a critical water source for millions of Coloradans. The reservoir’s proximity to Denver, combined with its relatively undeveloped surroundings, has made it a popular spot for both residents and tourists seeking outdoor recreation.

Attractions

Eleven Mile Reservoir is a premier destination for outdoor enthusiasts, offering a wide range of recreational opportunities that cater to different interests and skill levels. The reservoir’s calm waters are ideal for activities such as kayaking, canoeing, and fishing, with several designated fishing areas that attract anglers seeking to catch species like walleye, bass, and catfish. The Denver Water Department maintains the reservoir’s fish populations through stocking programs, ensuring a sustainable resource for recreational use. In addition to water-based activities, the surrounding area features hiking and biking trails that wind through grasslands and along the reservoir’s shoreline, providing opportunities for wildlife observation and photography.

Beyond its natural attractions, Eleven Mile Reservoir hosts various events and programs throughout the year, enhancing its appeal to visitors. Seasonal festivals, such as the annual “Eleven Mile Reservoir Open House,” offer guided tours of the reservoir’s infrastructure, including the dam and spillway, providing insight into its engineering and historical significance. The area also supports educational initiatives, with programs focused on water conservation, ecology, and the importance of the South Platte River Basin. These efforts have made the reservoir not only a recreational hub but also a center for environmental education and community engagement.

Getting There

Eleven Mile Reservoir is easily accessible from Denver and surrounding areas, making it a convenient destination for both day trips and extended stays. The reservoir is located approximately 25 miles east of Denver, along the Colorado State Highway 128, which connects to major thoroughfares such as Interstate 25 and U.S. Highway 85. Visitors can reach the reservoir by car, with several parking areas and access points available near the shoreline. Public transportation options include regional bus services operated by the Regional Transportation District (RTD), which provide connections to nearby cities such as Aurora and Parker.

For those traveling by foot or bicycle, the reservoir is part of a larger network of trails that link to other recreational areas in Douglas County. The South Platte River Trail, a multi-use path that runs parallel to the reservoir, offers a scenic route for hikers and cyclists, extending for miles in both directions. Additionally, the reservoir’s proximity to major highways and its inclusion in local tourism guides make it a popular stop for road trippers exploring Colorado’s Front Range. Visitors are encouraged to check local maps and transportation schedules for the most up-to-date information on access routes and services.