| Monarch Lake | |
| Location: | Grand County, Colorado |
| Coordinates: | 40.1057°N -105.7418°W |
| Type: | Reservoir |
| Inflow: | Arapaho Creek |
| Outflow: | Arapaho Creek |
| Basin Countries: | United States |
| Agency: | United States Forest Service |
| Volume: | 2000acre.ft |
| Elevation: | 2542abbr=offNaNabbr=off |
| Frozen: | Freezes in winter. |
| Pushpin Map: | Colorado |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | The lake's location in Colorado |
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,[1] and the trailhead at the west end of the lake also marks the beginnings or ends of several other popular hiking trails.[2]
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.[3] The primary inflow and outflow is Arapaho Creek.