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Hydrograph River at a Glance Download
Allegheny River at Natrona Lock and Dam Pool (ft)Flow (kcfs)Observed: 11.97 ft at 4:30PM May 22, 2022Observed: 11.96 ft at 4:45PM May 22, 2022Observed: 11.97 ft at 5:00PM May 22, 2022Observed: 11.95 ft at 5:15PM May 22, 2022Observed: 11.96 ft at 5:30PM May 22, 2022Observed: 11.96 ft at 5:45PM May 22, 2022Observed: 11.97 ft at 6:00PM May 22, 2022Observed: 11.97 ft at 6:15PM May 22, 2022Observed: 11.97 ft at 6:30PM May 22, 2022Observed: 11.96 ft at 6:45PM May 22, 2022Observed: 11.96 ft at 7:00PM May 22, 2022Observed: 11.96 ft at 7:15PM May 22, 2022Observed: 11.98 ft at 7:30PM May 22, 2022Observed: 11.97 ft at 7:45PM May 22, 2022Observed: 11.97 ft at 8:00PM May 22, 2022Observed: 11.97 ft at 8:15PM May 22, 2022Observed: 11.99 ft at 8:30PM May 22, 2022Observed: 11.99 ft at 8:45PM May 22, 2022Observed: 11.98 ft at 9:00PM May 22, 2022Observed: 11.98 ft at 9:15PM May 22, 2022Observed: 12 ft at 9:30PM May 22, 2022Observed: 12 ft at 9:45PM May 22, 2022Observed: 12 ft at 10:00PM May 22, 2022Observed: 11.99 ft at 10:15PM May 22, 2022Observed: 12.03 ft at 10:30PM May 22, 2022Observed: 12.02 ft at 10:45PM May 22, 2022Observed: 12.02 ft at 11:00PM May 22, 2022Observed: 12.01 ft at 11:15PM May 22, 2022Observed: 12.06 ft at 11:30PM May 22, 2022Observed: 12.05 ft at 11:45PM May 22, 2022Observed: 12.04 ft at 12:00AM May 23, 2022Observed: 12.03 ft at 12:15AM May 23, 2022Observed: 12.09 ft at 12:30AM May 23, 2022Observed: 12.08 ft at 12:45AM May 23, 2022Observed: 12.07 ft at 1:00AM May 23, 2022Observed: 12.06 ft at 1:15AM May 23, 2022Observed: 12.13 ft at 1:30AM May 23, 2022Observed: 12.13 ft at 1:45AM May 23, 2022Observed: 12.11 ft at 2:00AM May 23, 2022Observed: 12.1 ft at 2:15AM May 23, 2022Observed: 12.17 ft at 2:30AM May 23, 2022Observed: 12.16 ft at 2:45AM May 23, 2022Observed: 12.15 ft at 3:00AM May 23, 2022Observed: 12.14 ft at 3:15AM May 23, 2022Observed: 12.21 ft at 3:30AM May 23, 2022Observed: 12.2 ft at 3:45AM May 23, 2022Observed: 12.19 ft at 4:00AM May 23, 2022Observed: 12.18 ft at 4:15AM May 23, 2022Observed: 12.24 ft at 4:30AM May 23, 2022Observed: 12.23 ft at 4:45AM May 23, 2022Observed: 12.23 ft at 5:00AM May 23, 2022Observed: 12.22 ft at 5:15AM May 23, 2022Observed: 12.28 ft at 5:30AM May 23, 2022Observed: 12.27 ft at 5:45AM May 23, 2022Observed: 12.26 ft at 6:00AM May 23, 2022Observed: 12.25 ft at 6:15AM May 23, 2022Observed: 12.3 ft at 6:30AM May 23, 2022Observed: 12.3 ft at 6:45AM May 23, 2022Observed: 12.29 ft at 7:00AM May 23, 2022Observed: 12.28 ft at 7:15AM May 23, 2022Observed: 12.33 ft at 7:30AM May 23, 2022Observed: 12.32 ft at 7:45AM May 23, 2022Observed: 12.31 ft at 8:00AM May 23, 2022Observed: 12.3 ft at 8:15AM May 23, 2022Observed: 12.38 ft at 8:30AM May 23, 2022Observed: 12.36 ft at 8:45AM May 23, 2022Observed: 12.35 ft at 9:00AM May 23, 2022Observed: 12.33 ft at 9:15AM May 23, 2022Observed: 12.42 ft at 9:30AM May 23, 2022Observed: 12.41 ft at 9:45AM May 23, 2022Observed: 12.39 ft at 10:00AM May 23, 2022Observed: 12.39 ft at 10:15AM May 23, 2022Observed: 12.45 ft at 10:30AM May 23, 2022Observed: 12.44 ft at 10:45AM May 23, 2022Observed: 12.43 ft at 11:00AM May 23, 2022Observed: 12.43 ft at 11:15AM May 23, 2022Observed: 12.49 ft at 11:30AM May 23, 2022Observed: 12.48 ft at 11:45AM May 23, 2022Observed: 12.47 ft at 12:00PM May 23, 2022Observed: 12.46 ft at 12:15PM May 23, 2022Observed: 12.52 ft at 12:30PM May 23, 2022Observed: 12.51 ft at 12:45PM May 23, 2022Observed: 12.51 ft at 1:00PM May 23, 2022Observed: 12.5 ft at 1:15PM May 23, 2022Observed: 12.55 ft at 1:30PM May 23, 2022Observed: 12.54 ft at 1:45PM May 23, 2022Observed: 12.52 ft at 2:00PM May 23, 2022Observed: 12.53 ft at 2:15PM May 23, 2022Observed: 12.54 ft at 2:30PM May 23, 2022Observed: 12.55 ft at 2:45PM May 23, 2022Observed: 12.54 ft at 3:00PM May 23, 2022Observed: 12.53 ft at 3:15PM May 23, 2022Observed: 12.58 ft at 3:30PM May 23, 2022Observed: 12.57 ft at 3:45PM May 23, 2022Observed: 12.56 ft at 4:00PM May 23, 2022Observed: 12.55 ft at 4:15PM May 23, 2022Observed: 12.62 ft at 4:30PM May 23, 2022Observed: 12.61 ft at 4:45PM May 23, 2022Observed: 12.6 ft at 5:00PM May 23, 2022Observed: 12.59 ft at 5:15PM May 23, 2022Observed: 12.66 ft at 5:30PM May 23, 2022Observed: 12.65 ft at 5:45PM May 23, 2022Observed: 12.64 ft at 6:00PM May 23, 2022Observed: 12.63 ft at 6:15PM May 23, 2022Observed: 12.7 ft at 6:30PM May 23, 2022Observed: 12.69 ft at 6:45PM May 23, 2022Observed: 12.68 ft at 7:00PM May 23, 2022Observed: 12.67 ft at 7:15PM May 23, 2022Observed: 12.75 ft at 7:30PM May 23, 2022Observed: 12.74 ft at 7:45PM May 23, 2022Observed: 12.73 ft at 8:00PM May 23, 2022Observed: 12.71 ft at 8:15PM May 23, 2022Observed: 12.79 ft at 8:30PM May 23, 2022Observed: 12.78 ft at 8:45PM May 23, 2022Observed: 12.77 ft at 9:00PM May 23, 2022Observed: 12.76 ft at 9:15PM May 23, 2022Observed: 12.82 ft at 9:30PM May 23, 2022Observed: 12.81 ft at 9:45PM May 23, 2022Observed: 12.8 ft at 10:00PM May 23, 2022Observed: 12.79 ft at 10:15PM May 23, 2022Observed: 12.85 ft at 10:30PM May 23, 2022Observed: 12.84 ft at 10:45PM May 23, 2022Observed: 12.83 ft at 11:00PM May 23, 2022Observed: 12.83 ft at 11:15PM May 23, 2022Observed: 12.87 ft at 11:30PM May 23, 2022Observed: 12.86 ft at 11:45PM May 23, 2022Observed: 12.86 ft at 12:00AM May 24, 2022Observed: 12.85 ft at 12:15AM May 24, 2022Observed: 12.88 ft at 12:30AM May 24, 2022Observed: 12.88 ft at 12:45AM May 24, 2022Observed: 12.88 ft at 1:00AM May 24, 2022Observed: 12.88 ft at 1:15AM May 24, 2022Highest Observation: 12.89 ft at 1:30AM May 24, 2022Highest Observation: 12.89 ft at 1:45AM May 24, 2022Observed: 12.88 ft at 2:00AM May 24, 2022Observed: 12.88 ft at 2:15AM May 24, 2022Highest Observation: 12.89 ft at 2:30AM May 24, 2022Highest Observation: 12.89 ft at 2:45AM May 24, 2022Highest Observation: 12.89 ft at 3:00AM May 24, 2022Highest Observation: 12.89 ft at 3:15AM May 24, 2022Highest Observation: 12.89 ft at 3:30AM May 24, 2022Highest Observation: 12.89 ft at 3:45AM May 24, 2022Highest Observation: 12.89 ft at 4:00AM May 24, 2022Highest Observation: 12.89 ft at 4:15AM May 24, 2022Observed: 12.88 ft at 4:30AM May 24, 2022Highest Observation: 12.89 ft at 4:45AM May 24, 2022Highest Observation: 12.89 ft at 5:00AM May 24, 2022Highest Observation: 12.89 ft at 5:15AM May 24, 2022Observed: 12.88 ft at 5:30AM May 24, 2022Observed: 12.88 ft at 5:45AM May 24, 2022Observed: 12.88 ft at 6:00AM May 24, 2022Observed: 12.88 ft at 6:15AM May 24, 2022Observed: 12.88 ft at 6:30AM May 24, 2022Observed: 12.88 ft at 6:45AM May 24, 2022Observed: 12.88 ft at 7:00AM May 24, 2022Observed: 12.88 ft at 7:15AM May 24, 2022Observed: 12.88 ft at 7:30AM May 24, 2022Observed: 12.88 ft at 7:45AM May 24, 2022Observed: 12.88 ft at 8:00AM May 24, 2022Observed: 12.88 ft at 8:15AM May 24, 2022Observed: 12.86 ft at 9:30AM May 24, 2022Observed: 12.86 ft at 9:45AM May 24, 2022Observed: 12.86 ft at 10:00AM May 24, 2022Observed: 12.86 ft at 10:15AM May 24, 2022Observed: 12.87 ft at 10:30AM May 24, 2022Observed: 12.86 ft at 10:45AM May 24, 2022Observed: 12.87 ft at 11:00AM May 24, 2022Observed: 12.86 ft at 11:15AM May 24, 2022Observed: 12.86 ft at 11:30AM May 24, 2022Observed: 12.87 ft at 11:45AM May 24, 2022Observed: 12.87 ft at 12:00PM May 24, 2022Observed: 12.88 ft at 12:15PM May 24, 2022Observed: 12.87 ft at 12:30PM May 24, 2022Observed: 12.87 ft at 12:45PM May 24, 2022Observed: 12.87 ft at 1:00PM May 24, 2022Observed: 12.87 ft at 1:15PM May 24, 2022Observed: 12.87 ft at 1:30PM May 24, 2022Observed: 12.88 ft at 1:45PM May 24, 2022Observed: 12.88 ft at 2:00PM May 24, 2022Observed: 12.88 ft at 2:15PM May 24, 2022Observed: 12.87 ft at 2:30PM May 24, 2022Observed: 12.87 ft at 2:45PM May 24, 2022Observed: 12.87 ft at 3:00PM May 24, 2022Observed: 12.88 ft at 3:15PM May 24, 2022Observed: 12.86 ft at 3:30PM May 24, 2022Observed: 12.86 ft at 3:45PM May 24, 2022Observed: 12.86 ft at 4:00PM May 24, 2022Observed: 12.87 ft at 4:15PM May 24, 2022Observed: 12.85 ft at 4:30PM May 24, 2022Observed: 12.85 ft at 4:45PM May 24, 2022Observed: 12.86 ft at 5:00PM May 24, 2022Observed: 12.86 ft at 5:15PM May 24, 2022Observed: 12.85 ft at 5:30PM May 24, 2022Observed: 12.85 ft at 5:45PM May 24, 2022Observed: 12.85 ft at 6:00PM May 24, 2022Observed: 12.85 ft at 6:15PM May 24, 2022Observed: 12.85 ft at 6:30PM May 24, 2022Observed: 12.85 ft at 6:45PM May 24, 2022Observed: 12.85 ft at 7:00PM May 24, 2022Observed: 12.85 ft at 7:15PM May 24, 2022Observed: 12.84 ft at 7:30PM May 24, 2022Observed: 12.84 ft at 7:45PM May 24, 2022Observed: 12.84 ft at 8:00PM May 24, 2022Observed: 12.85 ft at 8:15PM May 24, 2022Observed: 12.82 ft at 8:30PM May 24, 2022Observed: 12.83 ft at 8:45PM May 24, 2022Observed: 12.83 ft at 9:00PM May 24, 2022Observed: 12.83 ft at 9:15PM May 24, 2022Observed: 12.81 ft at 9:30PM May 24, 2022Observed: 12.81 ft at 9:45PM May 24, 2022Observed: 12.82 ft at 10:00PM May 24, 2022Observed: 12.82 ft at 10:15PM May 24, 2022Observed: 12.8 ft at 10:30PM May 24, 2022Observed: 12.8 ft at 10:45PM May 24, 2022Observed: 12.81 ft at 11:00PM May 24, 2022Observed: 12.81 ft at 11:15PM May 24, 2022Observed: 12.78 ft at 11:30PM May 24, 2022Observed: 12.79 ft at 11:45PM May 24, 2022Observed: 12.79 ft at 12:00AM May 25, 2022Observed: 12.79 ft at 12:15AM May 25, 2022Observed: 12.77 ft at 12:30AM May 25, 2022Observed: 12.77 ft at 12:45AM May 25, 2022Observed: 12.78 ft at 1:00AM May 25, 2022Observed: 12.78 ft at 1:15AM May 25, 2022Observed: 12.74 ft at 1:30AM May 25, 2022Observed: 12.75 ft at 1:45AM May 25, 2022Observed: 12.76 ft at 2:00AM May 25, 2022Observed: 12.76 ft at 2:15AM May 25, 2022Observed: 12.73 ft at 2:30AM May 25, 2022Observed: 12.73 ft at 2:45AM May 25, 2022Observed: 12.73 ft at 3:00AM May 25, 2022Observed: 12.74 ft at 3:15AM May 25, 2022Observed: 12.7 ft at 3:30AM May 25, 2022Observed: 12.71 ft at 3:45AM May 25, 2022Observed: 12.71 ft at 4:00AM May 25, 2022Observed: 12.72 ft at 4:15AM May 25, 2022Observed: 12.68 ft at 4:30AM May 25, 2022Observed: 12.68 ft at 4:45AM May 25, 2022Observed: 12.69 ft at 5:00AM May 25, 2022Observed: 12.69 ft at 5:15AM May 25, 2022Observed: 12.66 ft at 5:30AM May 25, 2022Observed: 12.66 ft at 5:45AM May 25, 2022Observed: 12.67 ft at 6:00AM May 25, 2022Observed: 12.67 ft at 6:15AM May 25, 2022Observed: 12.63 ft at 6:30AM May 25, 2022Observed: 12.64 ft at 6:45AM May 25, 2022Observed: 12.64 ft at 7:00AM May 25, 2022Observed: 12.65 ft at 7:15AM May 25, 2022Observed: 12.63 ft at 7:30AM May 25, 2022Observed: 12.63 ft at 7:45AM May 25, 2022Observed: 12.63 ft at 8:00AM May 25, 2022Observed: 12.63 ft at 8:15AM May 25, 2022Observed: 12.59 ft at 8:30AM May 25, 2022Observed: 12.61 ft at 8:45AM May 25, 2022Observed: 12.62 ft at 9:00AM May 25, 2022Observed: 12.63 ft at 9:15AM May 25, 2022Observed: 12.55 ft at 9:30AM May 25, 2022Observed: 12.57 ft at 9:45AM May 25, 2022Observed: 12.58 ft at 10:00AM May 25, 2022Observed: 12.58 ft at 10:15AM May 25, 2022Observed: 12.52 ft at 10:30AM May 25, 2022Observed: 12.53 ft at 10:45AM May 25, 2022Observed: 12.54 ft at 11:00AM May 25, 2022Observed: 12.55 ft at 11:15AM May 25, 2022Observed: 12.48 ft at 11:30AM May 25, 2022Observed: 12.49 ft at 11:45AM May 25, 2022Observed: 12.5 ft at 12:00PM May 25, 2022Observed: 12.51 ft at 12:15PM May 25, 2022Observed: 12.2 ft at 12:30PM May 25, 2022Observed: 12.38 ft at 12:45PM May 25, 2022Observed: 12.41 ft at 1:00PM May 25, 2022Observed: 12.43 ft at 1:15PM May 25, 2022Observed: 12.27 ft at 1:30PM May 25, 2022Observed: 12.21 ft at 1:45PM May 25, 2022Observed: 12.03 ft at 2:00PM May 25, 2022Observed: 12.09 ft at 2:15PM May 25, 2022Observed: 12.39 ft at 2:30PM May 25, 2022Observed: 12.38 ft at 2:45PM May 25, 2022Observed: 12.35 ft at 3:00PM May 25, 2022Observed: 12.33 ft at 3:15PM May 25, 2022Highest Forecast: 12.4 ft 8:00PM May 25, 2022Forecast: 12.1 ft 2:00AM May 26, 2022Forecast: 12.1 ft 8:00AM May 26, 2022Forecast: 12 ft 2:00PM May 26, 2022Forecast: 11.9 ft 8:00PM May 26, 2022Forecast: 11.8 ft 2:00AM May 27, 2022Forecast: 11.8 ft 8:00AM May 27, 2022Forecast: 11.7 ft 2:00PM May 27, 2022Forecast: 11.6 ft 8:00PM May 27, 2022Forecast: 11.6 ft 2:00AM May 28, 2022Forecast: 11.6 ft 8:00AM May 28, 2022Forecast: 11.6 ft 2:00PM May 28, 2022Forecast: 11.6 ft 8:00PM May 28, 2022Forecast: 11.6 ft 2:00AM May 29, 2022Forecast: 11.5 ft 8:00AM May 29, 2022Forecast: 11.5 ft 2:00PM May 29, 2022Forecast: 11.5 ft 8:00PM May 29, 2022Forecast: 11.4 ft 2:00AM May 30, 2022Forecast: 11.4 ft 8:00AM May 30, 2022USGS--Water Resources of the United StatesNATP1(plotting HPIRG) Graph Created (4:18PM May 25, 2022)ObservedForecast (issued 10:51AM May 25)Latest observed value: 12.33 ft at 3:15 PM EDT 25-May-2022. Flood Stage is 21 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
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 Natrona Lock and Dam are issued routinely year-round.

Return to Area Map
Upstream Gauge - at Freeport Lock and Dam Upstream Gauge Downstream Gauge Downstream Gauge - at C.W. Bill Young Lock and Dam
Flood Categories (in feet)
Major Flood Stage: 26
Moderate Flood Stage: 24
Flood Stage: 21
Action Stage: 17.2
Low Stage (in feet): -9999

Historic Crests
(1) 32.10 ft on 03/18/1936
(2) 28.40 ft on 12/30/1942
(3) 27.60 ft on 01/22/1959
(4) 27.50 ft on 06/23/1972
(5) 26.40 ft on 03/10/1964
(6) 24.20 ft on 09/18/2004
(7) 23.10 ft on 01/20/1996
(8) 22.10 ft on 02/14/1966
(9) 21.80 ft on 02/17/1976
(10) 21.40 ft on 03/16/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 18.52 ft on 02/19/2022
(2) 18.63 ft on 02/09/2019
(3) 17.84 ft on 03/24/2007
(4) 21.40 ft on 03/16/2007
(5) 20.00 ft on 01/07/2005
(6) 24.20 ft on 09/18/2004
(7) 23.10 ft on 01/20/1996
(8) 20.70 ft on 12/31/1990
(9) 21.80 ft on 02/17/1976
(10) 27.50 ft on 06/23/1972
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.00 ft on 01/01/1980

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:15
KML Image
Gauge LocationGauge Map Marker
 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 Collapse
If you notice any errors in the below information, please contact our Webmaster
29.4 Pennsylvania Railroad main line and sidings affected at Tarentum PA, 3 miles downstream floods.
21.5 The Natrona Water Company is affected.
21.3 Water begins to back up into the sewers at Braeburn Steel Co.
21 Lock walls overtopped.
18 Navigation suspended, lock out of service.
About This Location Collapse

Latitude: 40.615278° N, Longitude: 79.718611° 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 736.04 ft 757.04 ft 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:
Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

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Hydrologic Resources Additional Resources
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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
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