Lakes / Colorado / Larimer County / Seaman Reservoir
Seaman Reservoir, Colorado
125 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.71 degrees N, 105.23 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 Seaman Reservoir Stacks Up
- Larger than 71% of the 778 lakes counted in Colorado.
- About 48 miles from Boulder, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Miners Lake | Larimer | 5.7 mi | 82 acres |
| Watson Lake | Larimer | 6.1 mi | 38 acres |
| Curtis Lake | Larimer | 6.3 mi | 137 acres |
| Dry Creek Reservoir | Larimer | 7.0 mi | 33 acres |
| North Poudre Reservoir Number 15 | Larimer | 7.8 mi | 293 acres |
| Claymore Lake | Larimer | 7.9 mi | 74 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Seaman Reservoir
How Big Is Seaman Reservoir?
Seaman Reservoir covers 125 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 128075626). Verified October 30, 2026.