Reservoir · South Dakota · United States · USACE CWMS
Oahe Dam & Reservoir
83.2% full
Capacity
23,806.2 hm³
Volume stored
19804 hm³
Coordinates
44.450°N, 100.405°W
Last updated
2026-06-11
Current fill
83.2%vs 7 days ago
0.0%stable
vs 1 year ago
-2.7%year-over-year
7-day trend
→stable
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: 2026-06-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.450, -100.405 · Open in Google Maps
About Oahe Dam & Reservoir
As of June 11, 2026, Oahe Dam & Reservoir is filled to 83.2% of its total capacity, holding roughly 19,804 hm³ of water out of a maximum 23,806 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 2.7 points below its level on the same date a year earlier.
Across the readings we hold for Oahe Dam & Reservoir — 1825 data points between June 13, 2021 and June 11, 2026 — the level has ranged from a low of 70.6% (December 8, 2022) to a high of 94.0% (June 13, 2021). 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 44.450°N, 100.405°W.
Key facts
- Current fill level
- 83.2%
- Water stored
- 19,804 hm³
- Total capacity
- 23,806 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 2.7 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- USACE
- Coordinates
- 44.450°N, 100.405°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 83.2% | 19,804 |
| 10 Jun 2026 | 83.2% | 19,808 |
| 9 Jun 2026 | 83.2% | 19,806 |
| 8 Jun 2026 | 83.2% | 19,801 |
| 7 Jun 2026 | 83.1% | 19,789 |
| 6 Jun 2026 | 83.1% | 19,794 |
| 5 Jun 2026 | 83.2% | 19,805 |
| 4 Jun 2026 | 83.1% | 19,788 |
| 3 Jun 2026 | 83.1% | 19,783 |
| 2 Jun 2026 | 83.1% | 19,785 |
| 1 Jun 2026 | 83.1% | 19,790 |
| 31 May 2026 | 83.1% | 19,792 |
Frequently asked questions
What is the current water level of Oahe Dam & Reservoir?
As of June 11, 2026, Oahe Dam & Reservoir is at 83.2% of its capacity, holding approximately 19,804 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Oahe Dam & Reservoir reservoir full?
No. As of June 11, 2026, Oahe Dam & Reservoir is high at 83.2% of its capacity, so it is not full.
Is the water level at Oahe Dam & Reservoir rising or falling?
The level at Oahe Dam & Reservoir has been broadly stable over the latest week on record (0.0 points).
How much water can Oahe Dam & Reservoir hold?
Oahe Dam & Reservoir has a total capacity of 23,806 hm³.
Where is Oahe Dam & Reservoir reservoir located?
Oahe Dam & Reservoir is located in South Dakota, United States, within the South Dakota basin (coordinates 44.450°N, 100.405°W).
What is Oahe Dam & Reservoir used for?
Oahe Dam & Reservoir is used primarily for multiple purposes, and is managed by USACE.