Lakes / Colorado / Larimer County / Halligan Reservoir
Halligan Reservoir, Colorado
256 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.88 degrees N, 105.35 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 Halligan Reservoir Stacks Up
- Larger than 83% of the 778 lakes counted in Colorado.
- About 60 miles from Boulder, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Park Creek Reservoir | Larimer | 10 mi | 240 acres |
| Dowdy Lake | Larimer | 12 mi | 104 acres |
| Parvin Lake | Larimer | 13 mi | 67 acres |
| Seaman Reservoir | Larimer | 13 mi | 125 acres |
| North Poudre Reservoir Number 15 | Larimer | 14 mi | 293 acres |
| Hiawatha Lake | Larimer | 14 mi | 29 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Halligan Reservoir
How Big Is Halligan Reservoir?
Halligan Reservoir covers 256 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 128075226). Verified October 30, 2026.