Action Stage
3187.2 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
3199 ft
Dam crest elevation.
3198.1 ft
Maximum Water Surface or Top of Surcharge Capacity.
3195 ft
Discharge from the reservoir is about 120,000 cfs with automatic control; higher with high inflows and manual control.
3187.2 ft
Top of active conservation elevation.
3163 ft
Elevation at top of inactive storage.
3062 ft
Streambed elevation at dam axis.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| May 19, 1978 | 3189.37 ft | -9,999 cfs |
| Jun 17, 1962 | 3189 ft | — |
| May 24, 1971 | 3188.42 ft | — |
About This Gauge
Get Flood Alerts for Angostura Reservoir
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Angostura Reservoir?
The Angostura Reservoir gauge is maintained by USGS (site 06401000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Angostura Reservoir?
This gauge has NWS-defined flood categories. Check the flood stages section above for current thresholds.
How do I get alerts when this river rises?
Download StormCast free on Google Play, go to River Gauges, and add Angostura Reservoir to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Angostura Reservoir gauge located?
The gauge is located in Fall River County, South Dakota at coordinates 43.3430°N, 103.4383°W. USGS site number: 06401000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
More Resources
Source & Notes
Data provided by: Observations courtesy of the USBR, Observations courtesy of the USGS, Observations courtesy of the USACE
- Stage may be affected by ice.
- Gauge reading may be affected by ice.