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Hydrograph River at a Glance Download
Allegheny River at Olean Stage (ft)Flow (kcfs)Observed: 5.13 ft at 4:30AM Mar 23, 2023Observed: 5.13 ft at 4:45AM Mar 23, 2023Observed: 5.13 ft at 5:00AM Mar 23, 2023Observed: 5.13 ft at 5:15AM Mar 23, 2023Observed: 5.13 ft at 5:30AM Mar 23, 2023Observed: 5.14 ft at 5:45AM Mar 23, 2023Observed: 5.13 ft at 6:00AM Mar 23, 2023Observed: 5.13 ft at 6:15AM Mar 23, 2023Observed: 5.14 ft at 6:30AM Mar 23, 2023Observed: 5.14 ft at 6:45AM Mar 23, 2023Observed: 5.14 ft at 7:00AM Mar 23, 2023Observed: 5.14 ft at 7:15AM Mar 23, 2023Observed: 5.14 ft at 7:30AM Mar 23, 2023Observed: 5.14 ft at 7:45AM Mar 23, 2023Observed: 5.15 ft at 8:00AM Mar 23, 2023Observed: 5.15 ft at 8:15AM Mar 23, 2023Observed: 5.15 ft at 8:30AM Mar 23, 2023Observed: 5.15 ft at 8:45AM Mar 23, 2023Observed: 5.15 ft at 9:00AM Mar 23, 2023Observed: 5.15 ft at 9:15AM Mar 23, 2023Observed: 5.15 ft at 9:30AM Mar 23, 2023Observed: 5.16 ft at 9:45AM Mar 23, 2023Observed: 5.16 ft at 10:00AM Mar 23, 2023Observed: 5.16 ft at 10:15AM Mar 23, 2023Observed: 5.17 ft at 10:30AM Mar 23, 2023Observed: 5.16 ft at 10:45AM Mar 23, 2023Observed: 5.17 ft at 11:00AM Mar 23, 2023Observed: 5.17 ft at 11:15AM Mar 23, 2023Observed: 5.18 ft at 11:30AM Mar 23, 2023Observed: 5.18 ft at 11:45AM Mar 23, 2023Observed: 5.18 ft at 12:00PM Mar 23, 2023Observed: 5.19 ft at 12:15PM Mar 23, 2023Observed: 5.2 ft at 12:30PM Mar 23, 2023Observed: 5.21 ft at 12:45PM Mar 23, 2023Observed: 5.2 ft at 1:00PM Mar 23, 2023Observed: 5.21 ft at 1:15PM Mar 23, 2023Observed: 5.21 ft at 1:30PM Mar 23, 2023Observed: 5.22 ft at 1:45PM Mar 23, 2023Observed: 5.23 ft at 2:00PM Mar 23, 2023Observed: 5.23 ft at 2:15PM Mar 23, 2023Observed: 5.24 ft at 2:30PM Mar 23, 2023Observed: 5.24 ft at 2:45PM Mar 23, 2023Observed: 5.25 ft at 3:00PM Mar 23, 2023Observed: 5.25 ft at 3:15PM Mar 23, 2023Observed: 5.26 ft at 3:30PM Mar 23, 2023Observed: 5.26 ft at 3:45PM Mar 23, 2023Observed: 5.28 ft at 4:00PM Mar 23, 2023Observed: 5.28 ft at 4:15PM Mar 23, 2023Observed: 5.3 ft at 4:30PM Mar 23, 2023Observed: 5.31 ft at 4:45PM Mar 23, 2023Observed: 5.32 ft at 5:00PM Mar 23, 2023Observed: 5.33 ft at 5:15PM Mar 23, 2023Observed: 5.34 ft at 5:30PM Mar 23, 2023Observed: 5.35 ft at 5:45PM Mar 23, 2023Observed: 5.36 ft at 6:00PM Mar 23, 2023Observed: 5.37 ft at 6:15PM Mar 23, 2023Observed: 5.39 ft at 6:30PM Mar 23, 2023Observed: 5.4 ft at 6:45PM Mar 23, 2023Observed: 5.42 ft at 7:00PM Mar 23, 2023Observed: 5.43 ft at 7:15PM Mar 23, 2023Observed: 5.45 ft at 7:30PM Mar 23, 2023Observed: 5.46 ft at 7:45PM Mar 23, 2023Observed: 5.47 ft at 8:00PM Mar 23, 2023Observed: 5.5 ft at 8:15PM Mar 23, 2023Observed: 5.52 ft at 8:30PM Mar 23, 2023Observed: 5.54 ft at 8:45PM Mar 23, 2023Observed: 5.56 ft at 9:00PM Mar 23, 2023Observed: 5.58 ft at 9:15PM Mar 23, 2023Observed: 5.61 ft at 9:30PM Mar 23, 2023Observed: 5.62 ft at 9:45PM Mar 23, 2023Observed: 5.65 ft at 10:00PM Mar 23, 2023Observed: 5.67 ft at 10:15PM Mar 23, 2023Observed: 5.71 ft at 10:30PM Mar 23, 2023Observed: 5.73 ft at 10:45PM Mar 23, 2023Observed: 5.75 ft at 11:00PM Mar 23, 2023Observed: 5.77 ft at 11:15PM Mar 23, 2023Observed: 5.8 ft at 11:30PM Mar 23, 2023Observed: 5.8 ft at 11:31PM Mar 23, 2023Observed: 5.82 ft at 11:45PM Mar 23, 2023Observed: 5.85 ft at 12:00AM Mar 24, 2023Observed: 5.87 ft at 12:15AM Mar 24, 2023Observed: 5.9 ft at 12:30AM Mar 24, 2023Observed: 5.93 ft at 12:45AM Mar 24, 2023Observed: 5.96 ft at 1:00AM Mar 24, 2023Observed: 5.98 ft at 1:15AM Mar 24, 2023Observed: 6 ft at 1:30AM Mar 24, 2023Observed: 6.02 ft at 1:45AM Mar 24, 2023Observed: 6.05 ft at 2:00AM Mar 24, 2023Observed: 6.06 ft at 2:15AM Mar 24, 2023Observed: 6.09 ft at 2:30AM Mar 24, 2023Observed: 6.11 ft at 2:45AM Mar 24, 2023Observed: 6.13 ft at 3:00AM Mar 24, 2023Observed: 6.15 ft at 3:15AM Mar 24, 2023Observed: 6.17 ft at 3:30AM Mar 24, 2023Observed: 6.19 ft at 3:45AM Mar 24, 2023Observed: 6.2 ft at 4:00AM Mar 24, 2023Observed: 6.21 ft at 4:15AM Mar 24, 2023Observed: 6.22 ft at 4:30AM Mar 24, 2023Observed: 6.23 ft at 4:45AM Mar 24, 2023Observed: 6.23 ft at 5:00AM Mar 24, 2023Observed: 6.25 ft at 5:15AM Mar 24, 2023Observed: 6.25 ft at 5:30AM Mar 24, 2023Observed: 6.26 ft at 5:45AM Mar 24, 2023Observed: 6.27 ft at 6:00AM Mar 24, 2023Observed: 6.27 ft at 6:15AM Mar 24, 2023Observed: 6.28 ft at 6:30AM Mar 24, 2023Observed: 6.28 ft at 6:45AM Mar 24, 2023Observed: 6.29 ft at 7:00AM Mar 24, 2023Observed: 6.29 ft at 7:15AM Mar 24, 2023Observed: 6.3 ft at 7:30AM Mar 24, 2023Observed: 6.31 ft at 7:45AM Mar 24, 2023Observed: 6.31 ft at 8:00AM Mar 24, 2023Observed: 6.31 ft at 8:15AM Mar 24, 2023Observed: 6.31 ft at 8:30AM Mar 24, 2023Observed: 6.31 ft at 8:45AM Mar 24, 2023Observed: 6.32 ft at 9:00AM Mar 24, 2023Observed: 6.32 ft at 9:15AM Mar 24, 2023Observed: 6.32 ft at 9:30AM Mar 24, 2023Observed: 6.32 ft at 9:45AM Mar 24, 2023Observed: 6.32 ft at 10:00AM Mar 24, 2023Observed: 6.32 ft at 10:15AM Mar 24, 2023Observed: 6.32 ft at 10:30AM Mar 24, 2023Observed: 6.33 ft at 10:45AM Mar 24, 2023Observed: 6.33 ft at 11:00AM Mar 24, 2023Observed: 6.33 ft at 11:15AM Mar 24, 2023Observed: 6.33 ft at 11:30AM Mar 24, 2023Observed: 6.33 ft at 11:45AM Mar 24, 2023Observed: 6.33 ft at 12:00PM Mar 24, 2023Observed: 6.34 ft at 12:15PM Mar 24, 2023Observed: 6.33 ft at 12:30PM Mar 24, 2023Observed: 6.34 ft at 12:45PM Mar 24, 2023Observed: 6.34 ft at 1:00PM Mar 24, 2023Observed: 6.34 ft at 1:15PM Mar 24, 2023Observed: 6.34 ft at 1:30PM Mar 24, 2023Observed: 6.34 ft at 1:45PM Mar 24, 2023Observed: 6.34 ft at 2:00PM Mar 24, 2023Observed: 6.34 ft at 2:15PM Mar 24, 2023Observed: 6.35 ft at 2:30PM Mar 24, 2023Observed: 6.34 ft at 2:45PM Mar 24, 2023Observed: 6.34 ft at 3:00PM Mar 24, 2023Observed: 6.34 ft at 3:15PM Mar 24, 2023Observed: 6.34 ft at 3:30PM Mar 24, 2023Observed: 6.34 ft at 3:45PM Mar 24, 2023Observed: 6.34 ft at 4:00PM Mar 24, 2023Observed: 6.34 ft at 4:15PM Mar 24, 2023Observed: 6.33 ft at 4:30PM Mar 24, 2023Observed: 6.34 ft at 4:45PM Mar 24, 2023Observed: 6.33 ft at 5:00PM Mar 24, 2023Observed: 6.33 ft at 5:15PM Mar 24, 2023Observed: 6.33 ft at 5:30PM Mar 24, 2023Observed: 6.33 ft at 5:45PM Mar 24, 2023Observed: 6.32 ft at 6:00PM Mar 24, 2023Observed: 6.32 ft at 6:15PM Mar 24, 2023Observed: 6.32 ft at 6:30PM Mar 24, 2023Observed: 6.32 ft at 6:45PM Mar 24, 2023Observed: 6.32 ft at 7:00PM Mar 24, 2023Observed: 6.31 ft at 7:15PM Mar 24, 2023Observed: 6.31 ft at 7:30PM Mar 24, 2023Observed: 6.3 ft at 7:45PM Mar 24, 2023Observed: 6.3 ft at 8:00PM Mar 24, 2023Observed: 6.3 ft at 8:15PM Mar 24, 2023Observed: 6.29 ft at 8:30PM Mar 24, 2023Observed: 6.29 ft at 8:45PM Mar 24, 2023Observed: 6.28 ft at 9:00PM Mar 24, 2023Observed: 6.28 ft at 9:15PM Mar 24, 2023Observed: 6.28 ft at 9:30PM Mar 24, 2023Observed: 6.27 ft at 9:45PM Mar 24, 2023Observed: 6.27 ft at 10:00PM Mar 24, 2023Observed: 6.26 ft at 10:15PM Mar 24, 2023Observed: 6.26 ft at 10:30PM Mar 24, 2023Observed: 6.25 ft at 10:45PM Mar 24, 2023Observed: 6.24 ft at 11:00PM Mar 24, 2023Observed: 6.24 ft at 11:15PM Mar 24, 2023Observed: 6.23 ft at 11:30PM Mar 24, 2023Observed: 6.23 ft at 11:31PM Mar 24, 2023Observed: 6.23 ft at 11:45PM Mar 24, 2023Observed: 6.22 ft at 12:00AM Mar 25, 2023Observed: 6.22 ft at 12:15AM Mar 25, 2023Observed: 6.21 ft at 12:30AM Mar 25, 2023Observed: 6.21 ft at 12:45AM Mar 25, 2023Observed: 6.2 ft at 1:00AM Mar 25, 2023Observed: 6.2 ft at 1:15AM Mar 25, 2023Observed: 6.19 ft at 1:30AM Mar 25, 2023Observed: 6.19 ft at 1:45AM Mar 25, 2023Observed: 6.18 ft at 2:00AM Mar 25, 2023Observed: 6.17 ft at 2:15AM Mar 25, 2023Observed: 6.17 ft at 2:30AM Mar 25, 2023Observed: 6.17 ft at 2:45AM Mar 25, 2023Observed: 6.16 ft at 3:00AM Mar 25, 2023Observed: 6.15 ft at 3:15AM Mar 25, 2023Observed: 6.15 ft at 3:30AM Mar 25, 2023Observed: 6.14 ft at 3:45AM Mar 25, 2023Observed: 6.14 ft at 4:00AM Mar 25, 2023Observed: 6.14 ft at 4:15AM Mar 25, 2023Observed: 6.13 ft at 4:30AM Mar 25, 2023Observed: 6.12 ft at 4:45AM Mar 25, 2023Observed: 6.12 ft at 5:00AM Mar 25, 2023Observed: 6.12 ft at 5:15AM Mar 25, 2023Observed: 6.12 ft at 5:30AM Mar 25, 2023Observed: 6.12 ft at 5:45AM Mar 25, 2023Observed: 6.12 ft at 6:00AM Mar 25, 2023Observed: 6.12 ft at 6:15AM Mar 25, 2023Observed: 6.12 ft at 6:30AM Mar 25, 2023Observed: 6.12 ft at 6:45AM Mar 25, 2023Observed: 6.12 ft at 7:00AM Mar 25, 2023Observed: 6.12 ft at 7:15AM Mar 25, 2023Observed: 6.15 ft at 7:30AM Mar 25, 2023Observed: 6.17 ft at 7:45AM Mar 25, 2023Observed: 6.25 ft at 8:00AM Mar 25, 2023Observed: 6.2 ft at 8:15AM Mar 25, 2023Observed: 6.23 ft at 8:30AM Mar 25, 2023Observed: 6.22 ft at 8:45AM Mar 25, 2023Observed: 6.21 ft at 9:00AM Mar 25, 2023Observed: 6.27 ft at 9:15AM Mar 25, 2023Observed: 6.25 ft at 9:30AM Mar 25, 2023Observed: 6.28 ft at 9:45AM Mar 25, 2023Observed: 6.29 ft at 10:00AM Mar 25, 2023Observed: 6.33 ft at 10:15AM Mar 25, 2023Observed: 6.36 ft at 10:30AM Mar 25, 2023Observed: 6.38 ft at 10:45AM Mar 25, 2023Observed: 6.45 ft at 11:00AM Mar 25, 2023Observed: 6.52 ft at 11:15AM Mar 25, 2023Observed: 6.61 ft at 11:30AM Mar 25, 2023Observed: 6.52 ft at 11:45AM Mar 25, 2023Observed: 6.57 ft at 12:00PM Mar 25, 2023Observed: 6.65 ft at 12:15PM Mar 25, 2023Observed: 6.6 ft at 12:30PM Mar 25, 2023Observed: 6.7 ft at 12:45PM Mar 25, 2023Observed: 6.68 ft at 1:00PM Mar 25, 2023Observed: 6.74 ft at 1:15PM Mar 25, 2023Observed: 6.74 ft at 1:30PM Mar 25, 2023Observed: 6.82 ft at 1:45PM Mar 25, 2023Observed: 6.85 ft at 2:00PM Mar 25, 2023Observed: 6.83 ft at 2:15PM Mar 25, 2023Observed: 6.89 ft at 2:30PM Mar 25, 2023Observed: 6.91 ft at 2:45PM Mar 25, 2023Observed: 7 ft at 3:00PM Mar 25, 2023Observed: 7 ft at 3:15PM Mar 25, 2023Observed: 7.09 ft at 3:30PM Mar 25, 2023Observed: 7.11 ft at 3:45PM Mar 25, 2023Observed: 7.13 ft at 4:00PM Mar 25, 2023Observed: 7.15 ft at 4:15PM Mar 25, 2023Observed: 7.2 ft at 4:30PM Mar 25, 2023Observed: 7.22 ft at 4:45PM Mar 25, 2023Observed: 7.22 ft at 5:00PM Mar 25, 2023Observed: 7.26 ft at 5:15PM Mar 25, 2023Observed: 7.28 ft at 5:30PM Mar 25, 2023Observed: 7.29 ft at 5:45PM Mar 25, 2023Observed: 7.3 ft at 6:00PM Mar 25, 2023Observed: 7.34 ft at 6:15PM Mar 25, 2023Observed: 7.36 ft at 6:30PM Mar 25, 2023Observed: 7.35 ft at 6:45PM Mar 25, 2023Observed: 7.37 ft at 7:00PM Mar 25, 2023Observed: 7.37 ft at 7:15PM Mar 25, 2023Observed: 7.37 ft at 7:30PM Mar 25, 2023Observed: 7.38 ft at 7:45PM Mar 25, 2023Observed: 7.43 ft at 8:00PM Mar 25, 2023Observed: 7.41 ft at 8:15PM Mar 25, 2023Observed: 7.45 ft at 8:30PM Mar 25, 2023Observed: 7.45 ft at 8:45PM Mar 25, 2023Observed: 7.46 ft at 9:00PM Mar 25, 2023Observed: 7.47 ft at 9:15PM Mar 25, 2023Observed: 7.48 ft at 9:30PM Mar 25, 2023Observed: 7.5 ft at 9:45PM Mar 25, 2023Observed: 7.51 ft at 10:00PM Mar 25, 2023Observed: 7.55 ft at 10:15PM Mar 25, 2023Observed: 7.54 ft at 10:30PM Mar 25, 2023Observed: 7.56 ft at 10:45PM Mar 25, 2023Observed: 7.57 ft at 11:00PM Mar 25, 2023Observed: 7.57 ft at 11:15PM Mar 25, 2023Observed: 7.59 ft at 11:30PM Mar 25, 2023Observed: 7.62 ft at 11:45PM Mar 25, 2023Observed: 7.63 ft at 12:00AM Mar 26, 2023Observed: 7.6 ft at 12:15AM Mar 26, 2023Observed: 7.67 ft at 12:30AM Mar 26, 2023Observed: 7.67 ft at 12:45AM Mar 26, 2023Observed: 7.69 ft at 1:00AM Mar 26, 2023Observed: 7.69 ft at 1:15AM Mar 26, 2023Observed: 7.74 ft at 1:30AM Mar 26, 2023Observed: 7.7 ft at 1:45AM Mar 26, 2023Observed: 7.73 ft at 2:00AM Mar 26, 2023Highest Observation: 7.76 ft at 2:15AM Mar 26, 2023Observed: 7.72 ft at 2:30AM Mar 26, 2023Observed: 7.73 ft at 2:45AM Mar 26, 2023Highest Observation: 7.76 ft at 3:00AM Mar 26, 2023Observed: 7.71 ft at 3:15AM Mar 26, 2023Observed: 7.73 ft at 3:30AM Mar 26, 2023Highest Forecast: 7.3 ft 8:00AM Mar 26, 2023Highest Forecast: 7.3 ft 2:00PM Mar 26, 2023Highest Forecast: 7.3 ft 8:00PM Mar 26, 2023Highest Forecast: 7.3 ft 2:00AM Mar 27, 2023Highest Forecast: 7.3 ft 8:00AM Mar 27, 2023Forecast: 7.2 ft 2:00PM Mar 27, 2023Forecast: 7 ft 8:00PM Mar 27, 2023Forecast: 6.8 ft 2:00AM Mar 28, 2023Forecast: 6.6 ft 8:00AM Mar 28, 2023Forecast: 6.3 ft 2:00PM Mar 28, 2023Forecast: 6 ft 8:00PM Mar 28, 2023Forecast: 5.7 ft 2:00AM Mar 29, 2023Forecast: 5.5 ft 8:00AM Mar 29, 2023Forecast: 5.2 ft 2:00PM Mar 29, 2023Forecast: 5 ft 8:00PM Mar 29, 2023Forecast: 4.8 ft 2:00AM Mar 30, 2023Forecast: 4.6 ft 8:00AM Mar 30, 2023OLNN6(plotting HGIRG) Graph Created (4:16AM Mar 26, 2023)ObservedForecast (issued 9:52AM Mar 25)Latest observed value: 7.73 ft at 3:30 AM EDT 26-Mar-2023. Flood Stage is 12 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Stage may be affected by ice during winter months.

NOTE: Forecasts for the Allegheny River at Olean are issued routinely year-round.

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Upstream Locations Upstream Gauge Downstream Gauge Downstream Gauge - at Salamanca
Flood Categories (in feet)
Major Flood Stage: 23
Moderate Flood Stage: 17
Flood Stage: 12
Action Stage: 10
Low Stage (in feet): -9999

Historic Crests
(1) 26.20 ft on 06/23/1972
(2) 23.30 ft on 07/19/1942
(3) 19.50 ft on 03/08/1956
(4) 19.30 ft on 05/29/1946
(5) 18.60 ft on 01/20/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.33 ft on 02/19/2022
(2) 13.91 ft on 01/14/2018
(3) 14.17 ft on 01/13/2017
(4) 17.74 ft on 12/03/2010
(5) 12.34 ft on 03/11/2009
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.50 ft on 08/03/1999
(2) 1.00 ft on 09/01/1998
(3) 1.15 ft on 08/10/2016
Zoom Level:16
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
25 Extreme flood, extensive residential flooding begins, especially upstream from Union Street bridge. Some evacuations necessary. Serious flooding upstream through Portville. Dikes overwhelmed.
23 Major flood, protective dikes begin to be topped. Some roadway flooding in residential areas of city begins, especially upstream. Serious flooding in areas unprotected by dikes including portions of Portville.
17 Moderate flood, water affects Riverview School of Aviation, 1.5 miles upstream of Union Street bridge. Local flooding occurs in areas unprotected by dikes including portions of Portville upstream.
12 Flood stage, flooding possible on Union Street in Allegany and East Riverside Drive 1 to 3 miles upstream of Olean. Some farm lands along the river are also impacted.
10 Action stage, high flows. No flooding.
About This Location Collapse

Latitude: 42.072222° N, Longitude: 78.451944° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 12 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 1399.50 ft 1411.50 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 1399.98 ft 1411.98 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 48 hours.

See the Product Description Document link for more details on the interpretation of the 3,7 day graphics.

Click individual graphics to enlarge.

Observations courtesy of the town of Olean.
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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Buffalo, NY 14225-1405
(716) 565-0204
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