Lakes / Idaho / Camas County / Mormon Reservoir
Mormon Reservoir, Idaho
1,440.32 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
43.26 degrees N, 114.82 degrees W - Camas 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 Mormon Reservoir Stacks Up
- Larger than 90% of the 316 lakes counted in Idaho.
- The largest lake in Camas County among those counted.
- About 37 miles from Ketchum, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| McHan Reservoir | Camas | 8.0 mi | 32.87 acres |
| Spring Creek Reservoir | Camas | 8.6 mi | 44.73 acres |
| Kelly Reservoir | Camas | 11 mi | 85.44 acres |
| Thorn Creek Reservoir | Camas | 12 mi | 116.96 acres |
| Macon Lake | Camas | 15 mi | 26.23 acres |
| Cow Creek Reservoir | Elmore | 15 mi | 44.23 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mormon Reservoir
How Big Is Mormon Reservoir?
Mormon Reservoir covers 1,440.32 acres in Camas County, Idaho.
What Is the Largest Lake in Camas County?
Mormon Reservoir is the largest lake in Camas County, at 1,440.32 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 52579627). Verified October 30, 2026.