Lakes / Colorado / Washington County / Prewitt Reservoir
Prewitt Reservoir, Colorado
1,888 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.42 degrees N, 103.36 degrees W - Washington 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 Prewitt Reservoir Stacks Up
- Larger than 97% of the 778 lakes counted in Colorado.
- The largest lake in Washington County among those counted.
- About 98 miles from Denver, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| A-27 Reservoir | Washington | 7.6 mi | 31 acres |
| Pawnee Raw Water Reservoir | Morgan | 21 mi | 137 acres |
| North Sterling Reservoir | Logan | 25 mi | 2,650 acres |
| Deering Lake | Washington | 32 mi | 78 acres |
| Bijou Number 2 Reservoir | Morgan | 34 mi | 414 acres |
| Rosener Reservoir | Morgan | 37 mi | 36 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Prewitt Reservoir
How Big Is Prewitt Reservoir?
Prewitt Reservoir covers 1,888 acres in Washington County, Colorado.
What Is the Largest Lake in Washington County?
Prewitt Reservoir is the largest lake in Washington County, at 1,888 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 126891781). Verified October 30, 2026.