Lakes / Idaho / Gem County / Sage Hen Reservoir
Sage Hen Reservoir, Gem County, Idaho
237.6 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
44.33 degrees N, 116.18 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 Sage Hen Reservoir Stacks Up
- Larger than 75% of the 316 lakes counted in Idaho.
- About 49 miles from Boise, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Herrick Reservoir | Valley | 10 mi | 44.11 acres |
| Corral Creek Reservoir | Valley | 16 mi | 31.41 acres |
| Davis Reservoir | Valley | 16 mi | 87.25 acres |
| Ben Ross Reservoir | Adams | 18 mi | 340.02 acres |
| Horsethief Reservoir | Valley | 18 mi | 247.46 acres |
| Lake Cascade | Valley | 19 mi | 25,043.4 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 52261962). Verified October 30, 2026.