Major Flood
26 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.
Moderate Flood
24 ft
Minor Flood
21 ft
Action Stage
17.2 ft
What Floods at Each Level
29.4 ft
Pennsylvania Railroad main line and sidings affected at Tarentum PA, 3 miles downstream floods.
21.5 ft
The Natrona Water Company is affected.
21.3 ft
Water begins to back up into the sewers at Braeburn Steel Co.
21 ft
Lock walls overtopped.
18 ft
Navigation suspended, lock out of service.
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 |
|---|---|---|
| Mar 17, 1936 | 32.1 ft | 365,000 cfs |
| Dec 29, 1942 | 28.4 ft | — |
| Jan 21, 1959 | 27.6 ft | — |
About This Gauge
USGS Site
NWS LID
NATP1
River
Allegheny River
County
Allegheny, PA
Coordinates
40.6153°N, 79.7186°W
Get Flood Alerts for Allegheny River
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 Allegheny River at Natrona Lock and Dam?
The Allegheny River at Natrona Lock and Dam gauge is maintained by USGS (site 03049500) 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 Allegheny River at Natrona Lock and Dam?
The NWS-defined flood stage for Allegheny River at Natrona Lock and Dam is 21 feet. Action stage begins at 17.2 feet. Moderate flooding starts at 24 feet, and major flooding at 26 feet.
How do I get alerts when Allegheny River rises?
Download StormCast free on Google Play, go to River Gauges, and add Allegheny River at Natrona Lock and Dam 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 Allegheny River at Natrona Lock and Dam gauge located?
The gauge is located in Allegheny County, Pennsylvania at coordinates 40.6153°N, 79.7186°W. USGS site number: 03049500. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Allegheny River
On This River
Upstream: Allegheny River at Freeport Lock and Dam
Downstream: Allegheny River at C.W. Bill Young Lock and Dam
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey, Observations courtesy of U.S. Army Corps of Engineers
- The above river forecast includes future rainfall/snowmelt. Forecast stages may be different if the actual rainfall/snowmelt is different than the forecast rainfall/snowmelt.
- Stage may be affected by ice.