Lakes / Idaho / Elmore County / Cow Creek Reservoir
Cow Creek Reservoir, Idaho
44.23 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
43.34 degrees N, 115.10 degrees W - Elmore 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 Cow Creek Reservoir Stacks Up
- Larger than 31% of the 316 lakes counted in Idaho.
- About 43 miles from Ketchum, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Anderson Ranch Reservoir | Elmore | 14 mi | 4,515.55 acres |
| Little Camas Reservoir | Elmore | 14 mi | 1,048.34 acres |
| Mormon Reservoir | Camas | 15 mi | 1,440.32 acres |
| Blair Trail Reservoir | Elmore | 23 mi | 177.67 acres |
| McHan Reservoir | Camas | 23 mi | 32.87 acres |
| Spring Creek Reservoir | Camas | 23 mi | 44.73 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Cow Creek Reservoir
How Big Is Cow Creek Reservoir?
Cow Creek Reservoir covers 44.23 acres in Elmore County, Idaho.
What Is the Largest Lake in Elmore County?
Anderson Ranch Reservoir is the largest lake in Elmore County, at 4,515.55 acres.
Largest Lakes in Idaho
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Pend Oreille | Bonner | 92,764.44 acres | - |
| 2 | American Falls Reservoir | Power | 55,319.78 acres | - |
| 3 | Coeur d'Alene Lake | Kootenai | 26,891.64 acres | - |
| 4 | Lake Cascade | Valley | 25,043.4 acres | - |
| 5 | Priest Lake | Bonner | 23,425.59 acres | - |
All 316 Idaho lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 52578915). Verified October 30, 2026.