Lakes / Colorado / Garfield County / Upper Stillwater Reservoir
Upper Stillwater Reservoir, Colorado
56 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.04 degrees N, 107.08 degrees W - Garfield County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Upper Stillwater Reservoir Stacks Up
- Larger than 48% of the 778 lakes counted in Colorado.
- About 60 miles from Aspen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Yamcolo Reservoir | Garfield | 1.5 mi | 184 acres |
| Stillwater Reservoir | Garfield | 3.0 mi | 129 acres |
| Gardner Park Reservoir | Routt | 3.2 mi | 50 acres |
| Keener Lake | Garfield | 4.3 mi | 29 acres |
| Heart Lake | Rio Blanco | 4.9 mi | 28 acres |
| Skinny Fish Lake | Garfield | 7.0 mi | 32 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Upper Stillwater Reservoir
How Big Is Upper Stillwater Reservoir?
Upper Stillwater Reservoir covers 56 acres in Garfield County, Colorado.
What Is the Largest Lake in Garfield County?
Trappers Lake is the largest lake in Garfield County, at 325 acres.
Largest Lakes in Colorado
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | John Martin Reservoir | Bent | 11,686 acres | - |
| 2 | Blue Mesa Reservoir | Gunnison | 8,944 acres | - |
| 3 | Lake Granby | Grand | 7,075 acres | - |
| 4 | Lake Meredith | Crowley | 5,539 acres | - |
| 5 | Adobe Creek Reservoir | Bent | 4,770 acres | - |
All 778 Colorado lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 90203169). Verified October 30, 2026.