Angostura Reservoir water level
▼ 5 points from 71.9% a year ago
Source: data.usbr.gov/rise/api/catalog-item/106, accessed October 1, 2026. Updated every 6 hours.
Angostura Reservoir is at 64.9% of full pool (3168.31 ft) as of September 23, 2026. Angostura Reservoir was last full on July 20, 2025 (95.2% of normal storage). Angostura Reservoir is near Hot Springs, South Dakota.
Angostura Reservoir level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: Bureau of Reclamation daily data.
Storage, % of full pool, since 1951
Angostura Reservoir is rising: 62.7% full, up 2.6 percentage points since September 20, 2026.
On this same date last year (September 21, 2025), Angostura Reservoir was 71.9% full, 9.2 percentage points higher than today's 62.7%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Angostura Reservoir map
Angostura Reservoir is at 43.3434, -103.4382. Open in OpenStreetMap.
The dam
- Irrigation
- Recreation
Sources: nid.sec.usace.army.mil, accessed September 29, 2026 , recreation.gov/camping/gateways/1161, accessed September 29, 2026
Data source: Recreation.gov
On the water
No campgrounds, boat ramps, or swim spots linked to Angostura Reservoir yet.
Common questions
- Angostura Reservoir is at 64.9% of full pool (3168.31 ft) as of September 23, 2026.
- Angostura Reservoir was last full on July 20, 2025, when it held 95.2% of its normal storage (elevation 3,176.92 ft). This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on Bureau of Reclamation daily data since October 1, 1951.
- In Bureau of Reclamation daily data since October 1, 1951, Angostura Reservoir's highest elevation was 3,189.37 ft on May 20, 1978. Its lowest after it first filled (April 1, 1952) was 3,163.22 ft on November 8, 1960. These are the highest and lowest daily readings in the published data, not official records.
- Angostura Reservoir is near Hot Springs, South Dakota (43.3434, -103.4382).
- Bureau of Reclamation operates the dam at Angostura Reservoir.
- Angostura Reservoir's dam is used for Irrigation, Recreation.