Lakes / Idaho / Valley County / Horsethief Reservoir
Horsethief Reservoir, Idaho
247.46 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
44.51 degrees N, 115.92 degrees W - Valley 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 Horsethief Reservoir Stacks Up
- Larger than 75% of the 316 lakes counted in Idaho.
- About 64 miles from Boise, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Corral Creek Reservoir | Valley | 3.4 mi | 31.41 acres |
| Davis Reservoir | Valley | 3.7 mi | 87.25 acres |
| Jemima K Reservoir | Valley | 6.6 mi | 84.85 acres |
| Herrick Reservoir | Valley | 10 mi | 44.11 acres |
| Lake Cascade | Valley | 11 mi | 25,043.4 acres |
| Warm Lake | Valley | 15 mi | 422.55 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Horsethief Reservoir
How Big Is Horsethief Reservoir?
Horsethief Reservoir covers 247.46 acres in Valley County, Idaho.
What Is the Largest Lake in Valley County?
Lake Cascade is the largest lake in Valley County, at 25,043.4 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 42401455). Verified October 30, 2026.