Lakes / Nebraska / Sheridan County / Isham Reservoir
Isham Reservoir, Nebraska
42 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Nebraska
42.91 degrees N, 102.78 degrees W - Sheridan 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 Isham Reservoir Stacks Up
- Larger than 29% of the 660 lakes counted in Nebraska.
- About 161 miles from North Platte, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Walgren Lake | Sheridan | 21 mi | 108 acres |
| Baldwin Reservoir | Dawes | 24 mi | 28 acres |
| Snus Lake | Dawes | 25 mi | 93 acres |
| Lone Tree Reservoir | Dawes | 27 mi | 58 acres |
| Pilster Reservoir | Dawes | 28 mi | 53 acres |
| Whitney Lake | Dawes | 28 mi | 962 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Isham Reservoir
How Big Is Isham Reservoir?
Isham Reservoir covers 42 acres in Sheridan County, Nebraska.
What Is the Largest Lake in Sheridan County?
Twin Lakes is the largest lake in Sheridan County, at 1,307 acres.
Largest Lakes in Nebraska
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake McConaughy | Keith | 24,885 acres | - |
| 2 | Harlan County Lake | Harlan | 12,822 acres | - |
| 3 | Calamus Reservoir | Loup | 5,032 acres | - |
| 4 | Swanson Lake | Hitchcock | 4,661 acres | - |
| 5 | Sutherland Reservoir | Lincoln | 2,956 acres | - |
All 660 Nebraska lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 126549693). Verified October 30, 2026.