Reservoir · South Dakota · United States · USACE CWMS
Gavins Point Dam & Reservoir
99.7% full
Capacity
462.56 hm³
Volume stored
461 hm³
Vs month average
102% of normal
Coordinates
42.850°N, 97.483°W
Last updated
2026-10-28
Current fill
99.7%vs 7 days ago
+0.2 ppgaining
vs 1 year ago
+1.8 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
102%of normal
99.7% full on 2026-10-28, against an average of 97.8% for October across 6 years of readings (+1.9 points).
Drought Monitor at this site · 27 October 2026
D0abnormally dry
The ground at Gavins Point Dam & Reservoir's coordinates falls inside the D0 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. South Dakota drought figures →
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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.850°N, 97.483°W · Open in Google Maps
About Gavins Point Dam & Reservoir
As of October 28, 2026, Gavins Point Dam & Reservoir is filled to 99.7% of its total capacity, holding 461.32 hm³ of water out of a maximum 462.56 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.2 pp), and it is 1.8 points above its level on the same date a year earlier.
Across the readings we hold for Gavins Point Dam & Reservoir — 1814 data points between October 30, 2021 and October 28, 2026 — the level has ranged from a low of 80.0% (February 26, 2022) to a high of 104.5% (February 12, 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 is at 42.850°N, 97.483°W.
Key facts
- Current fill level
- 99.7% of total capacity
- Water stored
- 461.32 hm³
- Total capacity
- 462.56 hm³
- 7-day change
- ▲ 0.2 pp
- Year-on-year
- ▲ 1.8 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 42.850°N, 97.483°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 99.7% | 461.32 |
| 27 Oct 2026 | 98.9% | 457.62 |
| 26 Oct 2026 | 98.7% | 456.39 |
| 25 Oct 2026 | 98.9% | 457.62 |
| 24 Oct 2026 | 99.2% | 458.86 |
| 23 Oct 2026 | 98.9% | 457.62 |
| 22 Oct 2026 | 99.2% | 458.86 |
| 21 Oct 2026 | 99.5% | 460.09 |
| 20 Oct 2026 | 99.7% | 461.32 |
| 19 Oct 2026 | 99.5% | 460.09 |
| 18 Oct 2026 | 98.7% | 456.39 |
| 17 Oct 2026 | 99.2% | 458.86 |