Lakes / Idaho / Twin Falls County / Williams Reservoir
Williams Reservoir, Idaho
45.22 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
42.27 degrees N, 114.42 degrees W - Twin Falls 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 Reservoir Stacks Up
- Larger than 32% of the 316 lakes counted in Idaho.
- About 20 miles from Twin Falls, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Deep Creek Reservoir | Twin Falls | 9.6 mi | 94.15 acres |
| Murtaugh Lake | Twin Falls | 19 mi | 819.4 acres |
| Salmon Falls Creek Reservoir | Twin Falls | 19 mi | 2,886.56 acres |
| Dierkes Lake | Twin Falls | 23 mi | 25.2 acres |
| Cedar Creek Reservoir | Twin Falls | 24 mi | 957.53 acres |
| Lower Goose Creek Reservoir | Cassia | 26 mi | 852.2 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Williams Reservoir
How Big Is Williams Reservoir?
Williams Reservoir covers 45.22 acres in Twin Falls County, Idaho.
What Is the Largest Lake in Twin Falls County?
Salmon Falls Creek Reservoir is the largest lake in Twin Falls County, at 2,886.56 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 89301324). Verified October 30, 2026.