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
23 ft
Minor Flood
20 ft
Action Stage
16.5 ft
What Floods at Each Level
32 ft
Elizabeth immediately downstream of Lock 3 floods.
30.5 ft
Water Street, First Street and Second Street in West Elizabeth flood. Flood waters are 4 to 5 feet deep in homes along Water Street.
27 ft
Serious damage to homes and industries in West Elizabeth. Many roads flood.
25.6 ft
Water reaches the first floor of numerous homes from the intersection of First and Border Streets north to the intersection of Mill and First streets in West Elizabeth.
24.05 ft
Water levels reach the flood levels of the flood of July 30, 2017.
23 ft
Industrial Chemical Corporation plant floods.
22 ft
In West Elizabeth basements of numerous homes in the block bounded by First and Water streets begin to flood.
20 ft
Small communities around Lock 3 area begin minor flooding.
18.1 ft
Lock walls overtopped.
17.5 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 | 32.5 ft | — |
| Nov 5, 1985 | 31.6 ft | — |
| Jan 19, 1996 | 30.3 ft | — |
About This Gauge
USGS Site
NWS LID
ELZP1
River
Monongahela River
County
Allegheny, PA
Coordinates
40.2622°N, 79.9014°W
Get Flood Alerts for Monongahela 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 Monongahela River at Elizabeth Lock and Dam?
The Monongahela River at Elizabeth Lock and Dam gauge is maintained by USGS (site 03075070) 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 Monongahela River at Elizabeth Lock and Dam?
The NWS-defined flood stage for Monongahela River at Elizabeth Lock and Dam is 20 feet. Action stage begins at 16.5 feet. Moderate flooding starts at 23 feet, and major flooding at 26 feet.
How do I get alerts when Monongahela River rises?
Download StormCast free on Google Play, go to River Gauges, and add Monongahela River at Elizabeth 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 Monongahela River at Elizabeth Lock and Dam gauge located?
The gauge is located in Allegheny County, Pennsylvania at coordinates 40.2622°N, 79.9014°W. USGS site number: 03075070. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Monongahela River
On This River
Upstream: Monongahela River at Charleroi Lock and Dam
Downstream: Monongahela River at Braddock 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
- Gauge readings unavailable - awaiting repair.
- Daily forecasts have been temporarily suspended. Forecasts will be issued as needed in times of high water.
- 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.