Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit https://www.weather.gov/owp/operations for more information.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Pittsburgh, PA

Ohio River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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Printable Image About this graph Tabular Data (UTC) Tabular Data (EST) Datum: NAVD88 Metadata

NOTE: 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. NOTE: Forecasts for the Allegheny River at Clinton Lock and Dam are issued routinely year-round.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 24 Moderate Flood Stage: 22 Flood Stage: 21 Action Stage: 17 Low Stage (in feet): -9999 Historic Crests (1) 26.40 ft on 03/18/1936 (2) 22.00 ft on 06/23/1972 (3) 20.30 ft on 09/18/2004 (4) 19.80 ft on 03/16/2007 (5) 19.20 ft on 12/31/1990 (6) 17.90 ft on 02/08/2019 (7) 16.20 ft on 03/23/2007 (P): Preliminary values subject to further review. Recent Crests (1) 17.90 ft on 02/08/2019 (2) 16.20 ft on 03/23/2007 (3) 19.80 ft on 03/16/2007 (4) 20.30 ft on 09/18/2004 (5) 19.20 ft on 12/31/1990 (6) 22.00 ft on 06/23/1972 (7) 26.40 ft on 03/18/1936 (P): Preliminary values subject to further review. Low Water Records Currently none available.

Zoom Level:16 Legend FEMA Layer Gauge Location Disclaimer Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

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26.4	Water reaches the bottom of the first floor window of the powerhouse at Lock 6.
23	Top of rail of the Pennsylvania Railroad across the river from the lock floods.
19	Lock walls overtopped.
17	Navigation suspended, lock out of service.

About This Location

Latitude: 40.716667° N, Longitude: 79.581111° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 21 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Vertical Datum Elevation (gauge height = 0) Elevation (gauge height = flood stage) Elevation information source NAVD88 759.8 780.8 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 760.4 781.4 Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: Corps of Engineers (COE) Info for Clinton Lock and Dam U.S. Geological Survey (USGS) Data and Site Info for Clinton Lock and Dam

Additional Information

Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels 10 Day (HEFS) 10 Day (NAEFS) 10 Day (GEFS) Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Ohio Basin Water Resources Outlook Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Hourly Precipitation Drought Statement Snow Information Ensemble River Forecasts

Collaborative Agencies The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here. NWS Information National Weather Service Pittsburgh Weather Forecast Office 192 Shafer Road Moon Township, PA 15108 (412) 262-1591 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:30 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities