Lakes / Idaho / Elmore County / Anderson Ranch Reservoir
Anderson Ranch Reservoir, Idaho
4,515.55 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
43.41 degrees N, 115.35 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 Anderson Ranch Reservoir Stacks Up
- Larger than 94% of the 316 lakes counted in Idaho.
- The largest lake in Elmore County among those counted.
- About 45 miles from Boise, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Little Camas Reservoir | Elmore | 5.5 mi | 1,048.34 acres |
| Cow Creek Reservoir | Elmore | 14 mi | 44.23 acres |
| Long Tom Reservoir | Elmore | 14 mi | 100.89 acres |
| Big Trinity Lake | Elmore | 15 mi | 25.95 acres |
| Blair Trail Reservoir | Elmore | 25 mi | 177.67 acres |
| Upper Teapot Reservoir | Elmore | 27 mi | 46.54 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Anderson Ranch Reservoir
How Big Is Anderson Ranch Reservoir?
Anderson Ranch Reservoir covers 4,515.55 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 55022067). Verified October 30, 2026.