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| Lake Granby | |
|---|---|
| Name | Lake Granby |
| Location | Grand County, Colorado, United States |
| Type | reservoir |
| Inflow | Colorado River, Grand Lake, Willow Creek |
| Outflow | Colorado River |
| Basin countries | United States |
| Area | 7,250 acres |
| Max-depth | 232 ft |
| Elevation | 8,284 ft |
Lake Granby is a large reservoir in Grand County, Colorado created by the construction of Granby Dam on the Colorado River near Granby, Colorado. It serves as a major component of the Colorado-Big Thompson Project and is situated in the vicinity of Rocky Mountain National Park, Arapaho National Forest, and the Continental Divide. The reservoir supports regional water diversion, recreation, and aquatic habitat within the headwaters of the Gunnison River and South Platte River basins.
Lake Granby lies west of Granby, Colorado and north of Grand Lake, Colorado, occupying a valley near the Continental Divide and adjacent to features such as Willow Creek Pass and Shadow Mountain Lake. The reservoir covers about 7,250 acres at an elevation near 8,284 feet and attains depths approaching 232 feet, with shorelines bordering lands administered by the United States Forest Service, Bureau of Reclamation, and private entities including Granby Ranch. The surrounding topography includes peaks like Mount Neva, Mount Craig, and Fairview Mountain and is drained by tributaries from watersheds encompassing Byers Peak, Thornton Creek, and Willow Creek.
The lake was formed following construction of Granby Dam by the United States Bureau of Reclamation as part of the Colorado-Big Thompson Project during the 1940s and 1950s, a federal initiative linked with contemporaneous projects such as Hoover Dam, Glen Canyon Dam, and Boulder Canyon Project. The project involved contractors and engineers associated with firms that worked on Morrow Point Dam and Gunnison Tunnel projects and reflects policy debates from the era involving agencies like the United States Congress and federal programs influenced by the New Deal and postwar infrastructure expansion. Local communities including Grand County, Colorado and municipalities such as Loveland, Colorado, Greeley, Colorado, and Fort Collins, Colorado were stakeholders in water allocation agreements mediated among entities like the Northern Colorado Water Conservancy District and agencies administering the Bureau of Land Management lands.
Lake Granby functions as a storage reservoir within the transmountain diversion system transferring water from the West Slope to the East Slope via the Alva B. Adams Tunnel, connecting to Big Thompson River tributaries and supplying water to users in the South Platte River basin including cities such as Denver, Colorado, Boulder, Colorado, and Loveland, Colorado. Water operations are coordinated among the Bureau of Reclamation, Northern Colorado Water Conservancy District, and regional entities like the Grand County Water Information Network. The hydrologic regime interacts with reservoirs like Shadow Mountain Lake, Grand Lake, Colorado, and Windy Gap Reservoir and is affected by snowmelt from ranges such as the Front Range (Colorado) and Never Summer Mountains. Management considerations include instream flows under laws influenced by the Colorado Water Conservation Board and interstate compacts like the Colorado River Compact and Upper Colorado River Basin Compact.
The reservoir and adjacent riparian zones provide habitat for species found in Rocky Mountain National Park and Arapaho National Forest environs, including populations of brown trout, rainbow trout, and kokanee salmon, as well as avifauna such as bald eagles, osprey, and trumpeter swans. Terrestrial wildlife utilizing the shoreline and nearby forests include elk, mule deer, black bear, and mountain lion. Aquatic ecology is influenced by introductions and management practices similar to those in lakes like Shadow Mountain Lake and river reaches managed under restoration efforts linked to organizations such as the Trout Unlimited chapters in Colorado and agencies like the Colorado Parks and Wildlife.
Lake Granby is a hub for recreational activities paralleling offerings at nearby destinations including Rocky Mountain National Park, Grand Lake, Colorado, and Winter Park, Colorado. Visitors engage in boating, fishing, camping, and skiing at nearby resorts like Granby Ranch and recreational areas administered by the National Park Service and United States Forest Service. Annual events and tourism patterns connect to regional attractions such as the Trail Ridge Road, Mount Evans Scenic Byway, and cultural venues in Steamboat Springs, Colorado and Estes Park, Colorado, supporting local businesses in Grand County, Colorado and hospitality services in towns like Fraser, Colorado.
Access to the lake is provided by roadways including U.S. Route 34 (Colorado), U.S. Route 40, and county roads linking to Granby, Colorado and Grand Lake, Colorado, with facilities maintained by the United States Bureau of Reclamation and recreational amenities managed by the United States Forest Service and local concessions. Energy and water infrastructure in the area connects to powerhouses and canals associated with the Colorado-Big Thompson Project, and transportation links tie into broader networks serving Denver International Airport, Glenwood Springs, Colorado, and Gunnison, Colorado. Emergency services and search-and-rescue operations coordinate with agencies such as the Grand County Sheriff's Office, Colorado State Patrol, and volunteer organizations active across Grand County, Colorado.
Category:Lakes of Colorado Category:Reservoirs in the United States