Necedah Wildlife Refuge 31 Reservoir
| Reservoir Name | Necedah Wildlife Refuge 31 |
| Dam Name | Sprague Mather |
| River | Branch of Yellow River |
| Administration City | Wisconsin |
| Country | United States |
| Year | 1940 |
| Dam Height | 5 |
| Dam Length | 10461 |
| Area(Sqkm) | 4.3 |
| Area(Polygonal) | 4.3 |
| Capital Expenditure | 19.7 |
| Depth(M) | 4.6 |
| Avg Displacement Of Water | 1195 |
| Catchment Area In Sqkm | 155 |
| Main Usage | Flood control |
| Status | 2: Good |
| Longitude | -90.187083 |
| Latitude | 44.145417 |
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