Reservoir · South Dakota · United States · BOR RISE
Angostura Reservoir and Dam
83.0% full
Capacity
106.28 hm³
Volume stored
88 hm³
Coordinates
43.343°N, 103.438°W
Last updated
2026-06-10
Current fill
83.0%vs 7 days ago
-0.1%losing
vs 1 year ago
-5.4%year-over-year
7-day trend
→stable
Data source: BOR RISE — US Bureau of Reclamation — 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: 2026-06-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.343, -103.438 · Open in Google Maps
About Angostura Reservoir and Dam
As of June 10, 2026, Angostura Reservoir and Dam is filled to 83.0% of its total capacity, holding roughly 88 hm³ of water out of a maximum 106 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it is 5.4 points below its level on the same date a year earlier.
Across the readings we hold for Angostura Reservoir and Dam — 1824 data points between June 13, 2021 and June 10, 2026 — the level has ranged from a low of 71.1% (September 26, 2025) to a high of 105.0% (June 13, 2021). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the South Dakota basin at 43.343°N, 103.438°W.
Key facts
- Current fill level
- 83.0%
- Water stored
- 88 hm³
- Total capacity
- 106 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 5.4 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- BOR
- Coordinates
- 43.343°N, 103.438°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 83.0% | 88 |
| 9 Jun 2026 | 83.1% | 88 |
| 8 Jun 2026 | 83.1% | 88 |
| 7 Jun 2026 | 83.1% | 88 |
| 6 Jun 2026 | 83.4% | 89 |
| 5 Jun 2026 | 83.1% | 88 |
| 4 Jun 2026 | 83.1% | 88 |
| 3 Jun 2026 | 83.0% | 88 |
| 2 Jun 2026 | 82.9% | 88 |
| 1 Jun 2026 | 82.8% | 88 |
| 31 May 2026 | 83.1% | 88 |
| 30 May 2026 | 83.3% | 89 |
Frequently asked questions
What is the current water level of Angostura Reservoir and Dam?
As of June 10, 2026, Angostura Reservoir and Dam is at 83.0% of its capacity, holding approximately 88 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Angostura Reservoir and Dam reservoir full?
No. As of June 10, 2026, Angostura Reservoir and Dam is high at 83.0% of its capacity, so it is not full.
Is the water level at Angostura Reservoir and Dam rising or falling?
The level at Angostura Reservoir and Dam has been broadly stable over the latest week on record (-0.1 points).
How much water can Angostura Reservoir and Dam hold?
Angostura Reservoir and Dam has a total capacity of 106 hm³.
Where is Angostura Reservoir and Dam reservoir located?
Angostura Reservoir and Dam is located in South Dakota, United States, within the South Dakota basin (coordinates 43.343°N, 103.438°W).
What is Angostura Reservoir and Dam used for?
Angostura Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.