Lakes / Colorado / Summit County / Dillon Reservoir
Dillon Reservoir, Colorado
3,219 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
39.60 degrees N, 106.06 degrees W - Summit 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 Dillon Reservoir Stacks Up
- Ranks #8 for surface area among the Colorado lakes counted so far - 3,219 acres.
- The largest lake in Summit County among those counted.
- About 49 miles from Aspen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Uneva Lake | Summit | 5.3 mi | 26 acres |
| Goose Pasture Tarn | Summit | 10 mi | 64 acres |
| Mayflower Tailings Pond | Summit | 13 mi | 275 acres |
| Clinton Gulch Dam Reservoir | Summit | 14 mi | 93 acres |
| Jefferson Lake | Park | 15 mi | 89 acres |
| Upper Slate Lake | Summit | 15 mi | 27 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Dillon Reservoir
How Big Is Dillon Reservoir?
Dillon Reservoir covers 3,219 acres in Summit County, Colorado.
What Is the Largest Lake in Summit County?
Dillon Reservoir is the largest lake in Summit County, at 3,219 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 79947680). Verified October 30, 2026.