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Hydrograph River at a Glance Download
Allegheny River at Natrona Lock and Dam Pool (ft)Flow (kcfs)Observed: 10.24 ft at 11:15AM Sep 20, 2023Observed: 10.24 ft at 11:30AM Sep 20, 2023Observed: 10.25 ft at 11:45AM Sep 20, 2023Observed: 10.25 ft at 12:00PM Sep 20, 2023Observed: 10.26 ft at 12:15PM Sep 20, 2023Observed: 10.26 ft at 12:30PM Sep 20, 2023Observed: 10.26 ft at 12:45PM Sep 20, 2023Observed: 10.27 ft at 1:00PM Sep 20, 2023Observed: 10.27 ft at 1:15PM Sep 20, 2023Observed: 10.27 ft at 1:30PM Sep 20, 2023Observed: 10.28 ft at 1:45PM Sep 20, 2023Observed: 10.28 ft at 2:00PM Sep 20, 2023Observed: 10.28 ft at 2:15PM Sep 20, 2023Observed: 10.28 ft at 2:30PM Sep 20, 2023Observed: 10.28 ft at 2:45PM Sep 20, 2023Observed: 10.28 ft at 3:00PM Sep 20, 2023Observed: 10.28 ft at 3:15PM Sep 20, 2023Observed: 10.28 ft at 3:30PM Sep 20, 2023Observed: 10.28 ft at 3:45PM Sep 20, 2023Observed: 10.28 ft at 4:00PM Sep 20, 2023Observed: 10.28 ft at 4:15PM Sep 20, 2023Observed: 10.28 ft at 4:30PM Sep 20, 2023Observed: 10.28 ft at 4:45PM Sep 20, 2023Observed: 10.28 ft at 5:00PM Sep 20, 2023Observed: 10.28 ft at 5:15PM Sep 20, 2023Observed: 10.28 ft at 5:30PM Sep 20, 2023Observed: 10.28 ft at 5:45PM Sep 20, 2023Observed: 10.28 ft at 6:00PM Sep 20, 2023Observed: 10.28 ft at 6:15PM Sep 20, 2023Observed: 10.28 ft at 6:30PM Sep 20, 2023Observed: 10.28 ft at 6:45PM Sep 20, 2023Observed: 10.28 ft at 7:00PM Sep 20, 2023Observed: 10.28 ft at 7:15PM Sep 20, 2023Observed: 10.28 ft at 7:30PM Sep 20, 2023Observed: 10.28 ft at 7:45PM Sep 20, 2023Observed: 10.28 ft at 8:00PM Sep 20, 2023Observed: 10.28 ft at 8:15PM Sep 20, 2023Observed: 10.28 ft at 8:30PM Sep 20, 2023Observed: 10.28 ft at 8:45PM Sep 20, 2023Observed: 10.27 ft at 9:00PM Sep 20, 2023Observed: 10.27 ft at 9:15PM Sep 20, 2023Observed: 10.25 ft at 9:30PM Sep 20, 2023Observed: 10.24 ft at 9:45PM Sep 20, 2023Observed: 10.23 ft at 10:00PM Sep 20, 2023Observed: 10.22 ft at 10:15PM Sep 20, 2023Observed: 10.21 ft at 10:30PM Sep 20, 2023Observed: 10.2 ft at 10:45PM Sep 20, 2023Observed: 10.2 ft at 11:00PM Sep 20, 2023Observed: 10.19 ft at 11:15PM Sep 20, 2023Observed: 10.19 ft at 11:30PM Sep 20, 2023Observed: 10.18 ft at 11:45PM Sep 20, 2023Observed: 10.18 ft at 12:00AM Sep 21, 2023Observed: 10.18 ft at 12:15AM Sep 21, 2023Observed: 10.17 ft at 12:30AM Sep 21, 2023Observed: 10.16 ft at 12:45AM Sep 21, 2023Observed: 10.17 ft at 1:00AM Sep 21, 2023Observed: 10.16 ft at 1:15AM Sep 21, 2023Observed: 10.16 ft at 1:30AM Sep 21, 2023Observed: 10.16 ft at 1:45AM Sep 21, 2023Observed: 10.16 ft at 2:00AM Sep 21, 2023Observed: 10.16 ft at 2:15AM Sep 21, 2023Observed: 10.16 ft at 3:30AM Sep 21, 2023Observed: 10.16 ft at 3:45AM Sep 21, 2023Observed: 10.16 ft at 4:00AM Sep 21, 2023Observed: 10.15 ft at 4:15AM Sep 21, 2023Observed: 10.15 ft at 4:30AM Sep 21, 2023Observed: 10.15 ft at 4:45AM Sep 21, 2023Observed: 10.15 ft at 5:00AM Sep 21, 2023Observed: 10.14 ft at 5:15AM Sep 21, 2023Observed: 10.14 ft at 6:30AM Sep 21, 2023Observed: 10.14 ft at 6:45AM Sep 21, 2023Observed: 10.14 ft at 7:00AM Sep 21, 2023Observed: 10.14 ft at 7:15AM Sep 21, 2023Observed: 10.14 ft at 7:30AM Sep 21, 2023Observed: 10.15 ft at 7:45AM Sep 21, 2023Observed: 10.17 ft at 8:00AM Sep 21, 2023Observed: 10.16 ft at 8:15AM Sep 21, 2023Observed: 10.18 ft at 8:30AM Sep 21, 2023Observed: 10.18 ft at 8:45AM Sep 21, 2023Observed: 10.19 ft at 9:00AM Sep 21, 2023Observed: 10.2 ft at 9:15AM Sep 21, 2023Observed: 10.2 ft at 9:30AM Sep 21, 2023Observed: 10.21 ft at 9:45AM Sep 21, 2023Observed: 10.21 ft at 10:00AM Sep 21, 2023Observed: 10.21 ft at 10:15AM Sep 21, 2023Observed: 10.22 ft at 11:30AM Sep 21, 2023Observed: 10.22 ft at 11:45AM Sep 21, 2023Observed: 10.22 ft at 12:00PM Sep 21, 2023Observed: 10.22 ft at 12:15PM Sep 21, 2023Observed: 10.21 ft at 2:30PM Sep 21, 2023Observed: 10.24 ft at 2:45PM Sep 21, 2023Observed: 10.22 ft at 3:00PM Sep 21, 2023Observed: 10.21 ft at 3:15PM Sep 21, 2023Observed: 10.23 ft at 3:30PM Sep 21, 2023Observed: 10.22 ft at 3:45PM Sep 21, 2023Observed: 10.23 ft at 4:00PM Sep 21, 2023Observed: 10.24 ft at 4:15PM Sep 21, 2023Observed: 10.22 ft at 4:30PM Sep 21, 2023Observed: 10.23 ft at 4:45PM Sep 21, 2023Observed: 10.23 ft at 5:00PM Sep 21, 2023Observed: 10.23 ft at 5:15PM Sep 21, 2023Observed: 10.23 ft at 5:30PM Sep 21, 2023Observed: 10.23 ft at 5:45PM Sep 21, 2023Observed: 10.23 ft at 6:00PM Sep 21, 2023Observed: 10.23 ft at 6:15PM Sep 21, 2023Observed: 10.23 ft at 6:30PM Sep 21, 2023Observed: 10.23 ft at 6:45PM Sep 21, 2023Observed: 10.23 ft at 7:00PM Sep 21, 2023Observed: 10.23 ft at 7:15PM Sep 21, 2023Observed: 10.23 ft at 7:30PM Sep 21, 2023Observed: 10.23 ft at 7:45PM Sep 21, 2023Observed: 10.23 ft at 8:00PM Sep 21, 2023Observed: 10.23 ft at 8:15PM Sep 21, 2023Observed: 10.23 ft at 8:30PM Sep 21, 2023Observed: 10.23 ft at 8:45PM Sep 21, 2023Observed: 10.23 ft at 9:00PM Sep 21, 2023Observed: 10.23 ft at 9:15PM Sep 21, 2023Observed: 10.22 ft at 9:30PM Sep 21, 2023Observed: 10.22 ft at 9:45PM Sep 21, 2023Observed: 10.23 ft at 10:00PM Sep 21, 2023Observed: 10.22 ft at 10:15PM Sep 21, 2023Observed: 10.23 ft at 10:30PM Sep 21, 2023Observed: 10.22 ft at 10:45PM Sep 21, 2023Observed: 10.22 ft at 11:00PM Sep 21, 2023Observed: 10.22 ft at 11:15PM Sep 21, 2023Observed: 10.22 ft at 11:30PM Sep 21, 2023Observed: 10.22 ft at 11:45PM Sep 21, 2023Observed: 10.22 ft at 12:00AM Sep 22, 2023Observed: 10.22 ft at 12:15AM Sep 22, 2023Observed: 10.22 ft at 12:30AM Sep 22, 2023Observed: 10.22 ft at 12:45AM Sep 22, 2023Observed: 10.22 ft at 1:00AM Sep 22, 2023Observed: 10.22 ft at 1:15AM Sep 22, 2023Observed: 10.22 ft at 1:30AM Sep 22, 2023Observed: 10.22 ft at 1:45AM Sep 22, 2023Observed: 10.21 ft at 2:00AM Sep 22, 2023Observed: 10.22 ft at 2:15AM Sep 22, 2023Observed: 10.2 ft at 3:30AM Sep 22, 2023Observed: 10.2 ft at 3:45AM Sep 22, 2023Observed: 10.2 ft at 4:00AM Sep 22, 2023Observed: 10.2 ft at 4:15AM Sep 22, 2023Observed: 10.2 ft at 4:30AM Sep 22, 2023Observed: 10.2 ft at 4:45AM Sep 22, 2023Observed: 10.2 ft at 5:00AM Sep 22, 2023Observed: 10.2 ft at 5:15AM Sep 22, 2023Observed: 10.2 ft at 5:30AM Sep 22, 2023Observed: 10.2 ft at 5:45AM Sep 22, 2023Observed: 10.2 ft at 6:00AM Sep 22, 2023Observed: 10.2 ft at 6:15AM Sep 22, 2023Observed: 10.2 ft at 6:30AM Sep 22, 2023Observed: 10.2 ft at 6:45AM Sep 22, 2023Observed: 10.19 ft at 7:00AM Sep 22, 2023Observed: 10.19 ft at 7:15AM Sep 22, 2023Observed: 10.18 ft at 8:30AM Sep 22, 2023Observed: 10.18 ft at 8:45AM Sep 22, 2023Observed: 10.16 ft at 9:00AM Sep 22, 2023Observed: 10.17 ft at 9:15AM Sep 22, 2023Observed: 10.16 ft at 10:30AM Sep 22, 2023Observed: 10.16 ft at 10:45AM Sep 22, 2023Observed: 10.16 ft at 11:00AM Sep 22, 2023Observed: 10.16 ft at 11:15AM Sep 22, 2023Observed: 10.16 ft at 11:30AM Sep 22, 2023Observed: 10.16 ft at 11:45AM Sep 22, 2023Observed: 10.16 ft at 12:00PM Sep 22, 2023Observed: 10.15 ft at 12:15PM Sep 22, 2023Observed: 10.15 ft at 12:30PM Sep 22, 2023Observed: 10.16 ft at 12:45PM Sep 22, 2023Observed: 10.15 ft at 1:00PM Sep 22, 2023Observed: 10.19 ft at 1:15PM Sep 22, 2023Observed: 10.16 ft at 1:30PM Sep 22, 2023Observed: 10.18 ft at 1:45PM Sep 22, 2023Observed: 10.18 ft at 2:00PM Sep 22, 2023Observed: 10.17 ft at 2:15PM Sep 22, 2023Observed: 10.18 ft at 2:30PM Sep 22, 2023Observed: 10.17 ft at 2:45PM Sep 22, 2023Observed: 10.22 ft at 3:00PM Sep 22, 2023Observed: 10.18 ft at 3:15PM Sep 22, 2023Observed: 10.2 ft at 4:30PM Sep 22, 2023Observed: 10.2 ft at 4:45PM Sep 22, 2023Observed: 10.2 ft at 5:00PM Sep 22, 2023Observed: 10.2 ft at 5:15PM Sep 22, 2023Observed: 10.2 ft at 5:30PM Sep 22, 2023Observed: 10.2 ft at 5:45PM Sep 22, 2023Observed: 10.2 ft at 6:00PM Sep 22, 2023Observed: 10.2 ft at 6:15PM Sep 22, 2023Observed: 10.2 ft at 6:30PM Sep 22, 2023Observed: 10.2 ft at 6:45PM Sep 22, 2023Observed: 10.21 ft at 7:00PM Sep 22, 2023Observed: 10.21 ft at 7:15PM Sep 22, 2023Observed: 10.21 ft at 7:30PM Sep 22, 2023Observed: 10.22 ft at 7:45PM Sep 22, 2023Observed: 10.22 ft at 8:00PM Sep 22, 2023Observed: 10.22 ft at 8:15PM Sep 22, 2023Observed: 10.22 ft at 8:30PM Sep 22, 2023Observed: 10.22 ft at 8:45PM Sep 22, 2023Observed: 10.23 ft at 9:00PM Sep 22, 2023Observed: 10.24 ft at 9:15PM Sep 22, 2023Observed: 10.24 ft at 9:30PM Sep 22, 2023Observed: 10.25 ft at 9:45PM Sep 22, 2023Observed: 10.26 ft at 10:00PM Sep 22, 2023Observed: 10.27 ft at 10:15PM Sep 22, 2023Observed: 10.28 ft at 10:30PM Sep 22, 2023Observed: 10.28 ft at 10:45PM Sep 22, 2023Observed: 10.3 ft at 11:00PM Sep 22, 2023Observed: 10.31 ft at 11:15PM Sep 22, 2023Observed: 10.32 ft at 11:30PM Sep 22, 2023Observed: 10.34 ft at 11:45PM Sep 22, 2023Observed: 10.35 ft at 12:00AM Sep 23, 2023Observed: 10.36 ft at 12:15AM Sep 23, 2023Observed: 10.38 ft at 12:30AM Sep 23, 2023Observed: 10.39 ft at 12:45AM Sep 23, 2023Observed: 10.4 ft at 1:00AM Sep 23, 2023Observed: 10.41 ft at 1:15AM Sep 23, 2023Observed: 10.48 ft at 2:30AM Sep 23, 2023Observed: 10.49 ft at 2:45AM Sep 23, 2023Observed: 10.5 ft at 3:00AM Sep 23, 2023Observed: 10.51 ft at 3:15AM Sep 23, 2023Observed: 10.52 ft at 3:30AM Sep 23, 2023Observed: 10.53 ft at 3:45AM Sep 23, 2023Observed: 10.54 ft at 4:00AM Sep 23, 2023Observed: 10.55 ft at 4:15AM Sep 23, 2023Observed: 10.56 ft at 4:30AM Sep 23, 2023Observed: 10.57 ft at 4:45AM Sep 23, 2023Observed: 10.57 ft at 5:00AM Sep 23, 2023Observed: 10.58 ft at 5:15AM Sep 23, 2023Observed: 10.6 ft at 6:30AM Sep 23, 2023Observed: 10.6 ft at 6:45AM Sep 23, 2023Observed: 10.6 ft at 7:00AM Sep 23, 2023Highest Observation: 10.61 ft at 7:15AM Sep 23, 2023Highest Forecast: 10.6 ft 2:00PM Sep 23, 2023Highest Forecast: 10.6 ft 8:00PM Sep 23, 2023Forecast: 10.5 ft 2:00AM Sep 24, 2023Forecast: 10.5 ft 8:00AM Sep 24, 2023Forecast: 10.5 ft 2:00PM Sep 24, 2023Forecast: 10.5 ft 8:00PM Sep 24, 2023Forecast: 10.5 ft 2:00AM Sep 25, 2023Forecast: 10.5 ft 8:00AM Sep 25, 2023Highest Forecast: 10.6 ft 2:00PM Sep 25, 2023Highest Forecast: 10.6 ft 8:00PM Sep 25, 2023Highest Forecast: 10.6 ft 2:00AM Sep 26, 2023Highest Forecast: 10.6 ft 8:00AM Sep 26, 2023Highest Forecast: 10.6 ft 2:00PM Sep 26, 2023Highest Forecast: 10.6 ft 8:00PM Sep 26, 2023Highest Forecast: 10.6 ft 2:00AM Sep 27, 2023Highest Forecast: 10.6 ft 8:00AM Sep 27, 2023Highest Forecast: 10.6 ft 2:00PM Sep 27, 2023Highest Forecast: 10.6 ft 8:00PM Sep 27, 2023Highest Forecast: 10.6 ft 2:00AM Sep 28, 2023Forecast: 10.5 ft 8:00AM Sep 28, 2023USGS--Water Resources of the United StatesNATP1(plotting HPIRG) Graph Created (11:03AM Sep 23, 2023)ObservedForecast (issued 9:15AM Sep 23)Latest observed value: 10.61 ft at 7:15 AM EDT 23-Sep-2023. 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.

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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) 10 Day (NAEFS) 10 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.

Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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
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Moon Township, PA 15108
(412) 262-1591
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