Lakes / Idaho / Adams County / Ben Ross Reservoir
Ben Ross Reservoir, Idaho
340.02 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
44.52 degrees N, 116.44 degrees W - Adams 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 Ben Ross Reservoir Stacks Up
- Larger than 78% of the 316 lakes counted in Idaho.
- About 63 miles from Boise, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Crane Creek Reservoir | Washington | 13 mi | 2,920.79 acres |
| Little Crane Creek Reservoir | Washington | 15 mi | 35.58 acres |
| Lake Cascade | Valley | 18 mi | 25,043.4 acres |
| Sage Hen Reservoir | Gem | 18 mi | 237.6 acres |
| Soulen Reservoir | Washington | 20 mi | 91.43 acres |
| Paddock Valley Reservoir | Washington | 21 mi | 1,182.15 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Ben Ross Reservoir
How Big Is Ben Ross Reservoir?
Ben Ross Reservoir covers 340.02 acres in Adams County, Idaho.
What Is the Largest Lake in Adams County?
Lost Valley Reservoir is the largest lake in Adams County, at 726 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 38105112). Verified October 30, 2026.