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Hydrograph River at a Glance Download
Allegheny River at Olean Stage (ft)Flow (kcfs)Highest Observation: 0.63 ft at 1:30PM Jul 19, 2014Highest Observation: 0.63 ft at 1:45PM Jul 19, 2014Highest Observation: 0.63 ft at 2:00PM Jul 19, 2014Highest Observation: 0.63 ft at 2:15PM Jul 19, 2014Highest Observation: 0.63 ft at 2:30PM Jul 19, 2014Highest Observation: 0.63 ft at 2:45PM Jul 19, 2014Highest Observation: 0.63 ft at 3:00PM Jul 19, 2014Observed: 0.62 ft at 3:15PM Jul 19, 2014Observed: 0.62 ft at 3:30PM Jul 19, 2014Observed: 0.62 ft at 3:45PM Jul 19, 2014Observed: 0.62 ft at 4:00PM Jul 19, 2014Observed: 0.62 ft at 4:15PM Jul 19, 2014Observed: 0.62 ft at 4:30PM Jul 19, 2014Observed: 0.61 ft at 4:45PM Jul 19, 2014Observed: 0.61 ft at 5:00PM Jul 19, 2014Observed: 0.61 ft at 5:15PM Jul 19, 2014Observed: 0.61 ft at 5:30PM Jul 19, 2014Observed: 0.61 ft at 5:45PM Jul 19, 2014Observed: 0.61 ft at 6:00PM Jul 19, 2014Observed: 0.61 ft at 6:15PM Jul 19, 2014Observed: 0.61 ft at 6:30PM Jul 19, 2014Observed: 0.61 ft at 6:45PM Jul 19, 2014Observed: 0.61 ft at 7:00PM Jul 19, 2014Observed: 0.61 ft at 7:15PM Jul 19, 2014Observed: 0.61 ft at 7:30PM Jul 19, 2014Observed: 0.61 ft at 7:45PM Jul 19, 2014Observed: 0.6 ft at 8:00PM Jul 19, 2014Observed: 0.6 ft at 8:15PM Jul 19, 2014Observed: 0.6 ft at 8:30PM Jul 19, 2014Observed: 0.6 ft at 8:45PM Jul 19, 2014Observed: 0.6 ft at 9:00PM Jul 19, 2014Observed: 0.59 ft at 9:15PM Jul 19, 2014Observed: 0.59 ft at 9:30PM Jul 19, 2014Observed: 0.58 ft at 10:45PM Jul 19, 2014Observed: 0.58 ft at 11:00PM Jul 19, 2014Observed: 0.58 ft at 11:15PM Jul 19, 2014Observed: 0.58 ft at 11:30PM Jul 19, 2014Observed: 0.57 ft at 11:45PM Jul 19, 2014Observed: 0.57 ft at 12:00AM Jul 20, 2014Observed: 0.57 ft at 12:15AM Jul 20, 2014Observed: 0.57 ft at 12:30AM Jul 20, 2014Observed: 0.57 ft at 12:45AM Jul 20, 2014Observed: 0.57 ft at 1:00AM Jul 20, 2014Observed: 0.57 ft at 1:15AM Jul 20, 2014Observed: 0.57 ft at 1:30AM Jul 20, 2014Observed: 0.57 ft at 1:45AM Jul 20, 2014Observed: 0.56 ft at 2:00AM Jul 20, 2014Observed: 0.56 ft at 2:15AM Jul 20, 2014Observed: 0.56 ft at 2:30AM Jul 20, 2014Observed: 0.56 ft at 2:45AM Jul 20, 2014Observed: 0.56 ft at 3:00AM Jul 20, 2014Observed: 0.56 ft at 3:15AM Jul 20, 2014Observed: 0.56 ft at 3:30AM Jul 20, 2014Observed: 0.56 ft at 3:45AM Jul 20, 2014Observed: 0.56 ft at 4:00AM Jul 20, 2014Observed: 0.56 ft at 4:15AM Jul 20, 2014Observed: 0.56 ft at 4:30AM Jul 20, 2014Observed: 0.56 ft at 4:45AM Jul 20, 2014Observed: 0.56 ft at 5:00AM Jul 20, 2014Observed: 0.56 ft at 5:15AM Jul 20, 2014Observed: 0.56 ft at 5:30AM Jul 20, 2014Observed: 0.56 ft at 5:45AM Jul 20, 2014Observed: 0.56 ft at 6:00AM Jul 20, 2014Observed: 0.56 ft at 6:15AM Jul 20, 2014Observed: 0.56 ft at 6:30AM Jul 20, 2014Observed: 0.56 ft at 6:45AM Jul 20, 2014Observed: 0.56 ft at 7:00AM Jul 20, 2014Observed: 0.56 ft at 7:15AM Jul 20, 2014Observed: 0.56 ft at 7:30AM Jul 20, 2014Observed: 0.56 ft at 7:45AM Jul 20, 2014Observed: 0.56 ft at 8:00AM Jul 20, 2014Observed: 0.56 ft at 8:15AM Jul 20, 2014Observed: 0.56 ft at 8:30AM Jul 20, 2014Observed: 0.56 ft at 8:45AM Jul 20, 2014Observed: 0.56 ft at 9:00AM Jul 20, 2014Observed: 0.56 ft at 9:15AM Jul 20, 2014Observed: 0.56 ft at 9:30AM Jul 20, 2014Observed: 0.56 ft at 9:45AM Jul 20, 2014Observed: 0.56 ft at 10:00AM Jul 20, 2014Observed: 0.56 ft at 10:15AM Jul 20, 2014Observed: 0.56 ft at 10:30AM Jul 20, 2014Observed: 0.56 ft at 10:45AM Jul 20, 2014Observed: 0.56 ft at 11:00AM Jul 20, 2014Observed: 0.56 ft at 11:15AM Jul 20, 2014Observed: 0.56 ft at 11:30AM Jul 20, 2014Observed: 0.56 ft at 11:45AM Jul 20, 2014Observed: 0.56 ft at 12:00PM Jul 20, 2014Observed: 0.56 ft at 12:15PM Jul 20, 2014Observed: 0.56 ft at 12:30PM Jul 20, 2014Observed: 0.56 ft at 12:45PM Jul 20, 2014Observed: 0.56 ft at 1:00PM Jul 20, 2014Observed: 0.56 ft at 1:15PM Jul 20, 2014Observed: 0.56 ft at 1:30PM Jul 20, 2014Observed: 0.56 ft at 1:45PM Jul 20, 2014Observed: 0.56 ft at 2:00PM Jul 20, 2014Observed: 0.56 ft at 2:15PM Jul 20, 2014Observed: 0.56 ft at 2:30PM Jul 20, 2014Observed: 0.55 ft at 2:45PM Jul 20, 2014Observed: 0.55 ft at 3:00PM Jul 20, 2014Observed: 0.55 ft at 3:15PM Jul 20, 2014Observed: 0.55 ft at 3:30PM Jul 20, 2014Observed: 0.55 ft at 3:45PM Jul 20, 2014Observed: 0.55 ft at 4:00PM Jul 20, 2014Observed: 0.55 ft at 4:15PM Jul 20, 2014Observed: 0.55 ft at 4:30PM Jul 20, 2014Observed: 0.55 ft at 4:45PM Jul 20, 2014Observed: 0.54 ft at 5:00PM Jul 20, 2014Observed: 0.54 ft at 5:15PM Jul 20, 2014Observed: 0.54 ft at 5:30PM Jul 20, 2014Observed: 0.54 ft at 5:45PM Jul 20, 2014Observed: 0.54 ft at 6:00PM Jul 20, 2014Observed: 0.54 ft at 6:15PM Jul 20, 2014Observed: 0.53 ft at 6:30PM Jul 20, 2014Observed: 0.53 ft at 6:45PM Jul 20, 2014Observed: 0.53 ft at 7:00PM Jul 20, 2014Observed: 0.53 ft at 7:15PM Jul 20, 2014Observed: 0.53 ft at 7:30PM Jul 20, 2014Observed: 0.53 ft at 7:45PM Jul 20, 2014Observed: 0.52 ft at 8:00PM Jul 20, 2014Observed: 0.52 ft at 8:15PM Jul 20, 2014Observed: 0.52 ft at 8:30PM Jul 20, 2014Observed: 0.52 ft at 8:45PM Jul 20, 2014Observed: 0.51 ft at 9:00PM Jul 20, 2014Observed: 0.51 ft at 9:15PM Jul 20, 2014Observed: 0.51 ft at 9:30PM Jul 20, 2014Observed: 0.51 ft at 9:45PM Jul 20, 2014Observed: 0.51 ft at 10:00PM Jul 20, 2014Observed: 0.5 ft at 10:15PM Jul 20, 2014Observed: 0.5 ft at 10:30PM Jul 20, 2014Observed: 0.5 ft at 10:45PM Jul 20, 2014Observed: 0.5 ft at 11:00PM Jul 20, 2014Observed: 0.5 ft at 11:15PM Jul 20, 2014Observed: 0.49 ft at 11:30PM Jul 20, 2014Observed: 0.49 ft at 11:45PM Jul 20, 2014Observed: 0.49 ft at 12:00AM Jul 21, 2014Observed: 0.49 ft at 12:15AM Jul 21, 2014Observed: 0.49 ft at 12:30AM Jul 21, 2014Observed: 0.48 ft at 12:45AM Jul 21, 2014Observed: 0.48 ft at 1:00AM Jul 21, 2014Observed: 0.48 ft at 1:15AM Jul 21, 2014Observed: 0.48 ft at 1:30AM Jul 21, 2014Observed: 0.48 ft at 1:45AM Jul 21, 2014Observed: 0.47 ft at 2:00AM Jul 21, 2014Observed: 0.47 ft at 2:15AM Jul 21, 2014Observed: 0.47 ft at 2:30AM Jul 21, 2014Observed: 0.46 ft at 2:45AM Jul 21, 2014Observed: 0.46 ft at 3:00AM Jul 21, 2014Observed: 0.46 ft at 3:15AM Jul 21, 2014Observed: 0.46 ft at 3:30AM Jul 21, 2014Observed: 0.45 ft at 3:45AM Jul 21, 2014Observed: 0.45 ft at 4:00AM Jul 21, 2014Observed: 0.45 ft at 4:15AM Jul 21, 2014Observed: 0.45 ft at 4:30AM Jul 21, 2014Observed: 0.45 ft at 4:45AM Jul 21, 2014Observed: 0.45 ft at 5:00AM Jul 21, 2014Observed: 0.44 ft at 5:15AM Jul 21, 2014Observed: 0.44 ft at 5:30AM Jul 21, 2014Observed: 0.44 ft at 5:45AM Jul 21, 2014Observed: 0.44 ft at 6:00AM Jul 21, 2014Observed: 0.43 ft at 6:15AM Jul 21, 2014Observed: 0.43 ft at 6:30AM Jul 21, 2014Observed: 0.43 ft at 6:45AM Jul 21, 2014Observed: 0.43 ft at 7:00AM Jul 21, 2014Observed: 0.42 ft at 7:15AM Jul 21, 2014Observed: 0.42 ft at 7:30AM Jul 21, 2014Observed: 0.42 ft at 7:45AM Jul 21, 2014Observed: 0.42 ft at 8:00AM Jul 21, 2014Observed: 0.42 ft at 8:15AM Jul 21, 2014Observed: 0.42 ft at 8:30AM Jul 21, 2014Observed: 0.41 ft at 8:45AM Jul 21, 2014Observed: 0.41 ft at 9:00AM Jul 21, 2014Observed: 0.41 ft at 9:15AM Jul 21, 2014Observed: 0.41 ft at 9:30AM Jul 21, 2014Observed: 0.41 ft at 9:45AM Jul 21, 2014Observed: 0.41 ft at 10:00AM Jul 21, 2014Observed: 0.4 ft at 10:15AM Jul 21, 2014Observed: 0.4 ft at 10:30AM Jul 21, 2014Observed: 0.4 ft at 10:45AM Jul 21, 2014Observed: 0.4 ft at 11:00AM Jul 21, 2014Observed: 0.39 ft at 11:15AM Jul 21, 2014Observed: 0.39 ft at 11:30AM Jul 21, 2014Observed: 0.39 ft at 11:45AM Jul 21, 2014Observed: 0.38 ft at 12:00PM Jul 21, 2014Observed: 0.38 ft at 12:15PM Jul 21, 2014Observed: 0.38 ft at 12:30PM Jul 21, 2014Observed: 0.38 ft at 12:45PM Jul 21, 2014Observed: 0.38 ft at 1:00PM Jul 21, 2014Observed: 0.37 ft at 1:15PM Jul 21, 2014Observed: 0.37 ft at 1:30PM Jul 21, 2014Observed: 0.37 ft at 1:45PM Jul 21, 2014Observed: 0.37 ft at 2:00PM Jul 21, 2014Observed: 0.37 ft at 2:15PM Jul 21, 2014Observed: 0.37 ft at 2:30PM Jul 21, 2014Observed: 0.36 ft at 2:45PM Jul 21, 2014Observed: 0.36 ft at 3:00PM Jul 21, 2014Observed: 0.36 ft at 3:15PM Jul 21, 2014Observed: 0.36 ft at 3:30PM Jul 21, 2014Observed: 0.36 ft at 3:45PM Jul 21, 2014Observed: 0.36 ft at 4:00PM Jul 21, 2014Observed: 0.35 ft at 4:15PM Jul 21, 2014Observed: 0.35 ft at 4:30PM Jul 21, 2014Observed: 0.35 ft at 4:45PM Jul 21, 2014Observed: 0.35 ft at 5:00PM Jul 21, 2014Observed: 0.34 ft at 5:15PM Jul 21, 2014Observed: 0.34 ft at 5:30PM Jul 21, 2014Observed: 0.34 ft at 5:45PM Jul 21, 2014Observed: 0.34 ft at 6:00PM Jul 21, 2014Observed: 0.34 ft at 6:15PM Jul 21, 2014Observed: 0.33 ft at 6:30PM Jul 21, 2014Observed: 0.33 ft at 6:45PM Jul 21, 2014Observed: 0.33 ft at 7:00PM Jul 21, 2014Observed: 0.33 ft at 7:15PM Jul 21, 2014Observed: 0.33 ft at 7:30PM Jul 21, 2014Observed: 0.32 ft at 7:45PM Jul 21, 2014Observed: 0.32 ft at 8:00PM Jul 21, 2014Observed: 0.32 ft at 8:15PM Jul 21, 2014Observed: 0.32 ft at 8:30PM Jul 21, 2014Observed: 0.32 ft at 8:45PM Jul 21, 2014Observed: 0.31 ft at 9:00PM Jul 21, 2014Observed: 0.31 ft at 9:15PM Jul 21, 2014Observed: 0.31 ft at 9:30PM Jul 21, 2014Observed: 0.31 ft at 9:45PM Jul 21, 2014Observed: 0.3 ft at 10:00PM Jul 21, 2014Observed: 0.3 ft at 10:15PM Jul 21, 2014Observed: 0.3 ft at 10:30PM Jul 21, 2014Observed: 0.3 ft at 10:45PM Jul 21, 2014Observed: 0.29 ft at 11:00PM Jul 21, 2014Observed: 0.29 ft at 11:15PM Jul 21, 2014Observed: 0.29 ft at 11:30PM Jul 21, 2014Observed: 0.29 ft at 11:45PM Jul 21, 2014Observed: 0.29 ft at 12:00AM Jul 22, 2014Observed: 0.29 ft at 12:15AM Jul 22, 2014Observed: 0.28 ft at 12:30AM Jul 22, 2014Observed: 0.28 ft at 12:45AM Jul 22, 2014Observed: 0.28 ft at 1:00AM Jul 22, 2014Observed: 0.27 ft at 1:15AM Jul 22, 2014Observed: 0.27 ft at 1:30AM Jul 22, 2014Observed: 0.27 ft at 1:45AM Jul 22, 2014Observed: 0.27 ft at 2:00AM Jul 22, 2014Observed: 0.27 ft at 2:15AM Jul 22, 2014Observed: 0.27 ft at 2:30AM Jul 22, 2014Observed: 0.27 ft at 2:45AM Jul 22, 2014Observed: 0.27 ft at 3:00AM Jul 22, 2014Observed: 0.27 ft at 3:15AM Jul 22, 2014Observed: 0.27 ft at 3:30AM Jul 22, 2014Observed: 0.27 ft at 3:45AM Jul 22, 2014Observed: 0.27 ft at 4:00AM Jul 22, 2014Observed: 0.28 ft at 4:15AM Jul 22, 2014Observed: 0.29 ft at 4:30AM Jul 22, 2014Observed: 0.29 ft at 4:45AM Jul 22, 2014Observed: 0.3 ft at 5:00AM Jul 22, 2014Observed: 0.31 ft at 5:15AM Jul 22, 2014Observed: 0.32 ft at 5:30AM Jul 22, 2014Observed: 0.33 ft at 5:45AM Jul 22, 2014Observed: 0.34 ft at 6:00AM Jul 22, 2014Observed: 0.36 ft at 6:15AM Jul 22, 2014Observed: 0.37 ft at 6:30AM Jul 22, 2014Observed: 0.39 ft at 6:45AM Jul 22, 2014Observed: 0.4 ft at 7:00AM Jul 22, 2014Observed: 0.41 ft at 7:15AM Jul 22, 2014Observed: 0.43 ft at 7:30AM Jul 22, 2014Observed: 0.45 ft at 7:45AM Jul 22, 2014Observed: 0.46 ft at 8:00AM Jul 22, 2014Observed: 0.47 ft at 8:15AM Jul 22, 2014Observed: 0.49 ft at 8:30AM Jul 22, 2014Observed: 0.5 ft at 8:45AM Jul 22, 2014Observed: 0.51 ft at 9:00AM Jul 22, 2014Observed: 0.52 ft at 9:15AM Jul 22, 2014Observed: 0.53 ft at 9:30AM Jul 22, 2014Observed: 0.54 ft at 9:45AM Jul 22, 2014Observed: 0.54 ft at 10:00AM Jul 22, 2014Observed: 0.55 ft at 10:15AM Jul 22, 2014Observed: 0.55 ft at 10:30AM Jul 22, 2014Observed: 0.56 ft at 10:45AM Jul 22, 2014Observed: 0.56 ft at 11:00AM Jul 22, 2014Observed: 0.56 ft at 11:15AM Jul 22, 2014Observed: 0.56 ft at 11:30AM Jul 22, 2014Observed: 0.56 ft at 11:45AM Jul 22, 2014Observed: 0.56 ft at 12:00PM Jul 22, 2014Observed: 0.55 ft at 12:15PM Jul 22, 2014Observed: 0.55 ft at 12:30PM Jul 22, 2014Highest Forecast: 0.4 ft 2:00PM Jul 22, 2014Forecast: 0.3 ft 8:00PM Jul 22, 2014Forecast: 0.3 ft 2:00AM Jul 23, 2014Forecast: 0.2 ft 8:00AM Jul 23, 2014Forecast: 0.2 ft 2:00PM Jul 23, 2014Forecast: 0.1 ft 8:00PM Jul 23, 2014Forecast: 0.1 ft 2:00AM Jul 24, 2014Forecast: 0.1 ft 8:00AM Jul 24, 2014Forecast: 0 ft 2:00PM Jul 24, 2014Forecast: 0 ft 8:00PM Jul 24, 2014Forecast: 0 ft 2:00AM Jul 25, 2014Forecast: 0 ft 8:00AM Jul 25, 2014Forecast: 0 ft 2:00PM Jul 25, 2014Forecast: 0 ft 8:00PM Jul 25, 2014Forecast: -0.1 ft 2:00AM Jul 26, 2014Forecast: -0.1 ft 8:00AM Jul 26, 2014Forecast: -0.1 ft 2:00PM Jul 26, 2014Forecast: -0.1 ft 8:00PM Jul 26, 2014Forecast: -0.2 ft 2:00AM Jul 27, 2014Forecast: -0.2 ft 8:00AM Jul 27, 2014OLNN6(plotting HGIRG) Graph Created (1:15PM Jul 22, 2014)ObservedForecast (issued 9:07AM Jul 22)Latest observed value: 0.55 ft at 12:30 PM EDT 22-Jul-2014. Flood Stage is 10 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
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:21
Moderate Flood Stage:15
Flood Stage:10
Action Stage:8

Historical Crests
(1) 24.20 ft on 06/23/1972
(2) 21.30 ft on 07/19/1942
(3) 17.50 ft on 03/08/1956
(4) 17.30 ft on 05/29/1946
(5) 16.60 ft on 01/20/1996
Show More Historical Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -1.50 ft on 08/03/1999
(2) -1.00 ft on 09/01/1998
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
23 EXTREME FLOOD...EXTENSIVE RESIDENTIAL FLOODING BEGINS...ESPECIALLY UPSTREAM FROM UNION STREET BRIDGE. SOME EVACUATIONS NECESSARY. SERIOUS FLOODING UPSTREAM THROUGH PORTVILLE. DIKES OVERWHELMED.
21 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.
15 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 MINOR FLOOD...WATER OVERFLOWS ONTO EAST RIVERSIDE DRIVE 1 TO 3 MILES UPSTREAM FROM UNION STREET BRIDGE.
10 FLOOD STAGE...FARM LANDS AND ROADS SEVERAL MILES FROM OLEAN FLOOD SLIGHTLY. NO DAMAGES.
8 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 10 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 1401.12 ft 1411.12 ft  

Current/Historical Observations:

Additional Information Collapse
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
Buffalo Weather Forecast Office
587 Aero Drive
Buffalo, NY 14225-1405
(716) 565-0204
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Page last modified: 16-Jul-2014 12:48 AM
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