Lakes / Colorado / Larimer County / Mountain Supply Reservoir Number 9
Mountain Supply Reservoir Number 9, Colorado
28 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.68 degrees N, 105.07 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 Mountain Supply Reservoir Number 9 Stacks Up
- Larger than 8% of the 778 lakes counted in Colorado.
- About 47 miles from Boulder, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Rocky Ridge Lake Reservoir Number 1 | Larimer | 0.8 mi | 215 acres |
| Water Supply and Storage Reservoir Number 3 | Larimer | 1.3 mi | 202 acres |
| North Poudre Reservoir Number 10 | Larimer | 1.4 mi | 39 acres |
| Douglass Lake | Larimer | 1.7 mi | 525 acres |
| Dixon Reservoir | Larimer | 1.8 mi | 40 acres |
| Windsor Reservoir | Larimer | 1.8 mi | 386 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mountain Supply Reservoir Number 9
How Big Is Mountain Supply Reservoir Number 9?
Mountain Supply Reservoir Number 9 covers 28 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 128075759). Verified October 30, 2026.