Monarch Lake
The lake in October 2022
Monarch Lake The lake's location in Colorado
Location	Grand County, Colorado
Coordinates	40°6′20.62″N 105°44′30.57″W / 40.1057278°N 105.7418250°W / 40.1057278; -105.7418250[1]
Type	Reservoir
Primary inflows	Arapaho Creek
Primary outflows	Arapaho Creek
Basin countries	United States
Managing agency	United States Forest Service
Built	1929 (1929)
Water volume	2,000 acre-feet (2,500,000 cubic meters)[2]
Surface elevation	2,542 meters (8,340 feet)[1]
Frozen	Freezes in winter.
Website	www.fs.usda.gov/recarea/arp/recarea/?recid=81813

Monarch Lake is a reservoir in Grand County, Colorado located within the Arapaho National Recreation Area. The reservoir is adjacent to the Indian Peaks Wilderness on its north and east sides. The Continental Divide National Scenic Trail passes along its south side,^[3] and the trailhead at the west end of the lake also marks the beginnings or ends of several other popular hiking trails.^[4]

Dam

The dam (NID ID #CO00714) is an earthen dam that was completed in 1929. The United States Forest Service owns the dam, which is used for recreation and fishing.^[2] The primary inflow and outflow is Arapaho Creek.