South Dakota lake levels today
11 lakes and reservoirs · 146 river gauges · updated Oct 21, 2026, 5:00 PM CDT
Of 9 South Dakota lakes with enough history to compare, 4 are below normal for the date and 2 are above normal.
Cottonwood Springs Lake is furthest below full pool, at ▼ 26.7 ft.
Lakes and reservoirs
| Lake | Level (ft) | vs full pool | % full | 7-day change | Vs normal |
|---|---|---|---|---|---|
| Belle Fourche Reservoir | 57.04 | – | – | ▲ 0.08 ft | |
| Big Bend Reservoir | 1,420.42 | ▲ 0.42 ft | – | ▼ 0.14 ft | Below normal for the date |
| Cold Brook Reservoir | 3,585.19 | ▲ 0.19 ft | – | ▲ 0.02 ft | Above normal for the date |
| Cottonwood Springs Lake | 3,848.31 | ▼ 26.69 ft | – | ▼ 0.10 ft | Much below normal for the date |
| Deerfield Reservoir | 1.95 | – | – | ▼ 0.74 ft | |
| Fort Randall Reservoir | 1,344.57 | ▼ 5.43 ft | – | ▼ 3.39 ft | Normal for the date |
| Gavins Point Reservoir | 1,207.89 | ▲ 3.39 ft | – | ▲ 0.32 ft | Above normal for the date |
| Mud Lake | 969.90 | ▼ 2.10 ft | – | ▼ 0.08 ft | Much below normal for the date |
| Oahe Reservoir | 1,592.11 | ▼ 15.39 ft | – | ▲ 0.06 ft | Normal for the date |
| Pactola Reservoir | 4,558.82 | ▼ 21.38 ft | – | ▲ 0.33 ft | Below normal for the date |
| Shadehill Reservoir | 2,265.14 | ▼ 6.86 ft | – | ▼ 0.17 ft | Normal for the date |
Tap a column heading to sort. "vs full pool" is shown only where the operator publishes a full-pool level on the same datum.