Lakes / Idaho / Gem County / Black Canyon Reservoir
Black Canyon Reservoir, Idaho
876.47 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
43.93 degrees N, 116.39 degrees W - Gem 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 Black Canyon Reservoir Stacks Up
- Larger than 87% of the 316 lakes counted in Idaho.
- The largest lake in Gem County among those counted.
- About 24 miles from Boise, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Paddock Valley Reservoir | Washington | 23 mi | 1,182.15 acres |
| Soulen Reservoir | Washington | 24 mi | 91.43 acres |
| Sage Hen Reservoir | Gem | 29 mi | 237.6 acres |
| Lake Lowell | Canyon | 30 mi | 7,083.31 acres |
| Buttermilk Slough | Washington | 31 mi | 59.8 acres |
| Crane Creek Reservoir | Washington | 32 mi | 2,920.79 acres |
Straight-line distance between lake centers.
Facts and Figures
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 52263070). Verified October 30, 2026.