Lakes / Colorado / Larimer County / Nelson Reservoir
Nelson Reservoir, Larimer County, Colorado
40 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.47 degrees N, 105.02 degrees W - Larimer 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 Nelson Reservoir Stacks Up
- Larger than 32% of the 778 lakes counted in Colorado.
- About 34 miles from Boulder, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Duck Lake | Larimer | 1.1 mi | 35 acres |
| Fossil Creek Reservoir | Larimer | 1.6 mi | 669 acres |
| Donath Lake | Larimer | 2.1 mi | 85 acres |
| Boyd Lake | Larimer | 2.6 mi | 1,623 acres |
| Horseshoe Lake | Larimer | 2.9 mi | 608 acres |
| Houts Reservoir | Larimer | 3.1 mi | 66 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Nelson Reservoir
How Big Is Nelson Reservoir?
Nelson Reservoir covers 40 acres in Larimer County, Colorado.
What Is the Largest Lake in Larimer County?
Horsetooth Reservoir is the largest lake in Larimer County, at 1,817 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 128076511). Verified October 30, 2026.