Reservoir · South Dakota · United States · USACE CWMS
Angostura Reservoir, SD
83.0% full
Capacity
106.28 hm³
Volume stored
88 hm³
Coordinates
43.307°N, 103.531°W
Last updated
2026-06-11
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: 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. 43.307, -103.531 · Open in Google Maps
About Angostura Reservoir, SD
As of June 11, 2026, Angostura Reservoir, SD 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, SD — 1825 data points between June 13, 2021 and June 11, 2026 — the level has ranged from a low of 71.1% (September 27, 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 USACE primarily for multiple purposes. It lies within the South Dakota basin at 43.307°N, 103.531°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
- USACE
- Coordinates
- 43.307°N, 103.531°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 83.0% | 88 |
| 10 Jun 2026 | 83.1% | 88 |
| 9 Jun 2026 | 83.1% | 88 |
| 8 Jun 2026 | 83.1% | 88 |
| 7 Jun 2026 | 83.4% | 89 |
| 6 Jun 2026 | 83.1% | 88 |
| 5 Jun 2026 | 83.1% | 88 |
| 4 Jun 2026 | 83.0% | 88 |
| 3 Jun 2026 | 82.9% | 88 |
| 2 Jun 2026 | 82.8% | 88 |
| 1 Jun 2026 | 83.1% | 88 |
| 31 May 2026 | 83.3% | 89 |
Frequently asked questions
What is the current water level of Angostura Reservoir, SD?
As of June 11, 2026, Angostura Reservoir, SD is at 83.0% of its capacity, holding approximately 88 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Angostura Reservoir, SD reservoir full?
No. As of June 11, 2026, Angostura Reservoir, SD is high at 83.0% of its capacity, so it is not full.
Is the water level at Angostura Reservoir, SD rising or falling?
The level at Angostura Reservoir, SD has been broadly stable over the latest week on record (-0.1 points).
How much water can Angostura Reservoir, SD hold?
Angostura Reservoir, SD has a total capacity of 106 hm³.
Where is Angostura Reservoir, SD reservoir located?
Angostura Reservoir, SD is located in South Dakota, United States, within the South Dakota basin (coordinates 43.307°N, 103.531°W).
What is Angostura Reservoir, SD used for?
Angostura Reservoir, SD is used primarily for multiple purposes, and is managed by USACE.