Lakes / Colorado / Bent County / John Martin Reservoir
John Martin Reservoir, Colorado
11,686 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
38.07 degrees N, 103.03 degrees W - Bent 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 John Martin Reservoir Stacks Up
- The largest lake counted in Colorado by surface area - 11,686 acres.
- The largest lake in Bent County among those counted.
- About 110 miles from Colorado Springs, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Hasty | Bent | 5.2 mi | 37 acres |
| Lake Hasty | Bent | 5.3 mi | 25 acres |
| G W Verhoeff Reservoir | Bent | 7.2 mi | 69 acres |
| Long Lake | Bent | 11 mi | 45 acres |
| Denny Lake | Bent | 13 mi | 38 acres |
| Heinan Lake | Bent | 17 mi | 40 acres |
Straight-line distance between lake centers.
Facts and Figures
Waterbody ID544cba07-5d51-4ac9-b924-000729720150
CountyBent
Lake TypeLake
Coordinates38.0731, -103.0281
Questions About John Martin Reservoir
How Big Is John Martin Reservoir?
John Martin Reservoir covers 11,686 acres in Bent County, Colorado.
What Is the Largest Lake in Bent County?
John Martin Reservoir is the largest lake in Bent County, at 11,686 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 544cba07-5d51-4ac9-b924-000729720150). Verified October 30, 2026.