Lakes / Idaho / Lemhi County / Williams Lake
Williams Lake, Idaho
181.38 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
45.02 degrees N, 113.98 degrees W - Lemhi 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 Williams Lake Stacks Up
- Larger than 70% of the 316 lakes counted in Idaho.
- The largest lake in Lemhi County among those counted.
- About 94 miles from Ketchum, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Bear Valley Lakes | Lemhi | 16 mi | 28.15 acres |
| Upper Miner Lakes | Lemhi | 22 mi | 30.14 acres |
| Mill Lake | Lemhi | 29 mi | 31.95 acres |
| Goat Lake | Lemhi | 31 mi | 25.45 acres |
| Ship Island Lake | Lemhi | 33 mi | 87.23 acres |
| Mosquito Flat Reservoir | Custer | 41 mi | 49.13 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Williams Lake
How Big Is Williams Lake?
Williams Lake covers 181.38 acres in Lemhi County, Idaho.
What Is the Largest Lake in Lemhi County?
Williams Lake is the largest lake in Lemhi County, at 181.38 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 50372488). Verified October 30, 2026.