Reservoir · South Dakota · United States · USACE CWMS
Fort Randall Dam & Reservoir
89.1% full
Capacity
4,687.23 hm³
Volume stored
4177 hm³
Coordinates
43.067°N, 98.553°W
Last updated
2026-09-10
Current fill
89.1%vs 7 days ago
-2.1%losing
vs 1 year ago
-0.3%year-over-year
7-day trend
↓falling
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.067, -98.553 · Open in Google Maps
About Fort Randall Dam & Reservoir
As of September 10, 2026, Fort Randall Dam & Reservoir is filled to 89.1% of its total capacity, holding roughly 4,177 hm³ of water out of a maximum 4,687 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 2.1 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Fort Randall Dam & Reservoir — 1821 data points between September 12, 2021 and September 10, 2026 — the level has ranged from a low of 55.6% (November 22, 2022) to a high of 104.1% (July 6, 2024). On average the reservoir is fullest around July and at its lowest around December.
It is operated by USACE primarily for multiple purposes. It lies within the South Dakota basin at 43.067°N, 98.553°W.
Key facts
- Current fill level
- 89.1%
- Water stored
- 4,177 hm³
- Total capacity
- 4,687 hm³
- 7-day change
- ▼ 2.1 pts
- Year-on-year
- ▼ 0.3 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- USACE
- Coordinates
- 43.067°N, 98.553°W
- Last updated
- September 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Sep 2026 | 89.1% | 4,177 |
| 9 Sep 2026 | 89.0% | 4,172 |
| 8 Sep 2026 | 88.7% | 4,159 |
| 7 Sep 2026 | 89.3% | 4,188 |
| 6 Sep 2026 | 90.5% | 4,243 |
| 5 Sep 2026 | 91.2% | 4,276 |
| 4 Sep 2026 | 91.3% | 4,281 |
| 3 Sep 2026 | 91.2% | 4,276 |
| 2 Sep 2026 | 91.1% | 4,269 |
| 1 Sep 2026 | 91.0% | 4,264 |
| 31 Aug 2026 | 91.5% | 4,289 |
| 30 Aug 2026 | 92.1% | 4,315 |