Lakes / Colorado / Alamosa County / San Luis Lake
San Luis Lake, Colorado
798 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
37.68 degrees N, 105.72 degrees W - Alamosa 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 San Luis Lake Stacks Up
- Larger than 94% of the 778 lakes counted in Colorado.
- The largest lake in Alamosa County among those counted.
- About 94 miles from Colorado Springs, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Head Lake | Alamosa | 2.6 mi | 212 acres |
| Weisman Lake | Saguache | 16 mi | 62 acres |
| Adams Lake | Alamosa | 20 mi | 44 acres |
| Upper Sand Creek Lake | Saguache | 21 mi | 25 acres |
| Mishak Lakes | Saguache | 21 mi | 52 acres |
| Sherman Lake | Rio Grande | 21 mi | 61 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About San Luis Lake
How Big Is San Luis Lake?
San Luis Lake covers 798 acres in Alamosa County, Colorado.
What Is the Largest Lake in Alamosa County?
San Luis Lake is the largest lake in Alamosa County, at 798 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 125212799). Verified October 30, 2026.