Reservoir · South Dakota · United States · USACE CWMS
Gavins Point Dam & Reservoir
94.4% full
Capacity
462.56 hm³
Volume stored
437 hm³
Coordinates
42.850°N, 97.483°W
Last updated
2026-09-13
Current fill
94.4%vs 7 days ago
+4.0%gaining
vs 1 year ago
+2.1%year-over-year
7-day trend
↑rising
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: 2026-09-13.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.850, -97.483 · Open in Google Maps
About Gavins Point Dam & Reservoir
As of September 13, 2026, Gavins Point Dam & Reservoir is filled to 94.4% of its total capacity, holding roughly 437 hm³ of water out of a maximum 463 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has risen by 4.0 percentage points, and it is 2.1 points above its level on the same date a year earlier.
Across the readings we hold for Gavins Point Dam & Reservoir — 1821 data points between September 15, 2021 and September 13, 2026 — the level has ranged from a low of 80.0% (February 26, 2022) to a high of 105.0% (February 9, 2024). On average the reservoir is fullest around December and at its lowest around April.
It is operated by USACE primarily for multiple purposes. It lies within the South Dakota basin at 42.850°N, 97.483°W.
Key facts
- Current fill level
- 94.4%
- Water stored
- 437 hm³
- Total capacity
- 463 hm³
- 7-day change
- ▲ 4.0 pts
- Year-on-year
- ▲ 2.1 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- USACE
- Coordinates
- 42.850°N, 97.483°W
- Last updated
- September 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Sep 2026 | 94.4% | 437 |
| 12 Sep 2026 | 94.7% | 438 |
| 11 Sep 2026 | 94.7% | 438 |
| 10 Sep 2026 | 95.5% | 442 |
| 9 Sep 2026 | 94.1% | 435 |
| 8 Sep 2026 | 92.5% | 428 |
| 7 Sep 2026 | 91.5% | 423 |
| 6 Sep 2026 | 90.4% | 418 |
| 5 Sep 2026 | 89.9% | 416 |
| 4 Sep 2026 | 90.4% | 418 |
| 3 Sep 2026 | 89.9% | 416 |
| 2 Sep 2026 | 89.9% | 416 |