Lakes / Idaho / Lemhi County / Mill Lake
Mill Lake, Idaho
31.95 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
44.66 degrees N, 113.66 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 Mill Lake Stacks Up
- Larger than 15% of the 316 lakes counted in Idaho.
- About 76 miles from Ketchum, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Bear Valley Lakes | Lemhi | 15 mi | 28.15 acres |
| Williams Lake | Lemhi | 29 mi | 181.38 acres |
| Mosquito Flat Reservoir | Custer | 39 mi | 49.13 acres |
| Upper Miner Lakes | Lemhi | 42 mi | 30.14 acres |
| Mackay Reservoir | Custer | 48 mi | 1,177.96 acres |
| Sullivan Lake | Custer | 49 mi | 40.53 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mill Lake
How Big Is Mill Lake?
Mill Lake covers 31.95 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 44191838). Verified October 30, 2026.