Lakes / Idaho / Franklin County / Twin Lakes Reservoir
Twin Lakes Reservoir, Franklin County, Idaho
439.35 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
42.19 degrees N, 111.97 degrees W - Franklin 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 Twin Lakes Reservoir Stacks Up
- Larger than 82% of the 316 lakes counted in Idaho.
- The largest lake in Franklin County among those counted.
- About 90 miles from Idaho Falls, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Winder Reservoir | Franklin | 4.9 mi | 76.94 acres |
| Condie Reservoir | Franklin | 5.5 mi | 86.24 acres |
| Strongarm Reservoir Number One | Franklin | 6.8 mi | 150.98 acres |
| Swan Lake | Bannock | 7.1 mi | 60.29 acres |
| Foster Reservoir | Franklin | 8.2 mi | 66.22 acres |
| Upper Deep Creek Reservoir | Oneida | 8.9 mi | 26.19 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Twin Lakes Reservoir
How Big Is Twin Lakes Reservoir?
Twin Lakes Reservoir covers 439.35 acres in Franklin County, Idaho.
What Is the Largest Lake in Franklin County?
Twin Lakes Reservoir is the largest lake in Franklin County, at 439.35 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 40837147). Verified October 30, 2026.