Reservoir · South Dakota · United States · BOR RISE
Angostura Reservoir and Dam
69.3% full
Capacity
106.28 hm³
Volume stored
74 hm³
Coordinates
43.343°N, 103.438°W
Last updated
2026-07-28
Current fill
69.3%vs 7 days ago
-0.4%losing
vs 1 year ago
-14.1%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: 2026-07-28.
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 July 28, 2026, Angostura Reservoir and Dam is filled to 69.3% of its total capacity, holding roughly 74 hm³ of water out of a maximum 106 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it is 14.1 points below its level on the same date a year earlier.
Across the readings we hold for Angostura Reservoir and Dam — 1823 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 69.3% (July 28, 2026) to a high of 105.0% (March 24, 2022). On average the reservoir is fullest around May 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
- 69.3%
- Water stored
- 74 hm³
- Total capacity
- 106 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 14.1 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- BOR
- Coordinates
- 43.343°N, 103.438°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 69.3% | 74 |
| 27 Jul 2026 | 69.7% | 74 |
| 26 Jul 2026 | 69.9% | 74 |
| 25 Jul 2026 | 70.3% | 75 |
| 24 Jul 2026 | 70.7% | 75 |
| 23 Jul 2026 | 71.1% | 76 |
| 22 Jul 2026 | 71.3% | 76 |
| 21 Jul 2026 | 71.8% | 76 |
| 20 Jul 2026 | 72.3% | 77 |
| 19 Jul 2026 | 72.8% | 77 |
| 18 Jul 2026 | 73.2% | 78 |
| 17 Jul 2026 | 73.6% | 78 |
Frequently asked questions
What is the current water level of Angostura Reservoir and Dam?
As of July 28, 2026, Angostura Reservoir and Dam is at 69.3% of its capacity, holding approximately 74 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Angostura Reservoir and Dam reservoir full?
No. As of July 28, 2026, Angostura Reservoir and Dam is within its normal operating range at 69.3% 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 (-0.4 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.