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Hydrograph River at a Glance Download
Allegheny River at Olean Stage (ft)Flow (kcfs)Observed: -0.32 ft at 12:45PM Aug 30, 2014Observed: -0.32 ft at 1:00PM Aug 30, 2014Observed: -0.32 ft at 1:15PM Aug 30, 2014Observed: -0.32 ft at 1:30PM Aug 30, 2014Observed: -0.32 ft at 1:45PM Aug 30, 2014Observed: -0.32 ft at 2:00PM Aug 30, 2014Observed: -0.32 ft at 2:15PM Aug 30, 2014Observed: -0.32 ft at 2:30PM Aug 30, 2014Observed: -0.32 ft at 2:45PM Aug 30, 2014Observed: -0.32 ft at 3:00PM Aug 30, 2014Observed: -0.32 ft at 3:15PM Aug 30, 2014Observed: -0.32 ft at 3:30PM Aug 30, 2014Observed: -0.32 ft at 3:45PM Aug 30, 2014Observed: -0.32 ft at 4:00PM Aug 30, 2014Observed: -0.32 ft at 4:15PM Aug 30, 2014Observed: -0.32 ft at 4:30PM Aug 30, 2014Observed: -0.32 ft at 4:45PM Aug 30, 2014Observed: -0.32 ft at 5:00PM Aug 30, 2014Observed: -0.32 ft at 5:15PM Aug 30, 2014Observed: -0.32 ft at 5:30PM Aug 30, 2014Observed: -0.32 ft at 5:45PM Aug 30, 2014Observed: -0.32 ft at 6:00PM Aug 30, 2014Observed: -0.33 ft at 6:15PM Aug 30, 2014Observed: -0.33 ft at 6:30PM Aug 30, 2014Observed: -0.33 ft at 6:45PM Aug 30, 2014Observed: -0.33 ft at 7:00PM Aug 30, 2014Observed: -0.33 ft at 7:15PM Aug 30, 2014Observed: -0.33 ft at 7:30PM Aug 30, 2014Observed: -0.33 ft at 7:45PM Aug 30, 2014Observed: -0.33 ft at 8:00PM Aug 30, 2014Observed: -0.34 ft at 8:15PM Aug 30, 2014Observed: -0.34 ft at 8:30PM Aug 30, 2014Observed: -0.35 ft at 8:45PM Aug 30, 2014Observed: -0.35 ft at 9:00PM Aug 30, 2014Observed: -0.36 ft at 9:15PM Aug 30, 2014Observed: -0.36 ft at 9:30PM Aug 30, 2014Observed: -0.36 ft at 9:45PM Aug 30, 2014Observed: -0.36 ft at 10:00PM Aug 30, 2014Observed: -0.36 ft at 10:15PM Aug 30, 2014Observed: -0.36 ft at 10:30PM Aug 30, 2014Observed: -0.36 ft at 10:45PM Aug 30, 2014Observed: -0.37 ft at 11:00PM Aug 30, 2014Observed: -0.37 ft at 11:15PM Aug 30, 2014Observed: -0.37 ft at 11:30PM Aug 30, 2014Observed: -0.37 ft at 11:45PM Aug 30, 2014Observed: -0.37 ft at 12:00AM Aug 31, 2014Observed: -0.37 ft at 12:15AM Aug 31, 2014Observed: -0.37 ft at 12:30AM Aug 31, 2014Observed: -0.37 ft at 12:45AM Aug 31, 2014Observed: -0.37 ft at 1:00AM Aug 31, 2014Observed: -0.37 ft at 1:15AM Aug 31, 2014Observed: -0.37 ft at 1:30AM Aug 31, 2014Observed: -0.37 ft at 1:45AM Aug 31, 2014Observed: -0.37 ft at 2:00AM Aug 31, 2014Observed: -0.38 ft at 2:15AM Aug 31, 2014Observed: -0.38 ft at 2:30AM Aug 31, 2014Observed: -0.38 ft at 2:45AM Aug 31, 2014Observed: -0.38 ft at 3:00AM Aug 31, 2014Observed: -0.38 ft at 3:15AM Aug 31, 2014Observed: -0.38 ft at 3:30AM Aug 31, 2014Observed: -0.38 ft at 3:45AM Aug 31, 2014Observed: -0.37 ft at 4:00AM Aug 31, 2014Observed: -0.37 ft at 4:15AM Aug 31, 2014Observed: -0.37 ft at 4:30AM Aug 31, 2014Observed: -0.37 ft at 4:45AM Aug 31, 2014Observed: -0.37 ft at 5:00AM Aug 31, 2014Observed: -0.37 ft at 5:15AM Aug 31, 2014Observed: -0.37 ft at 5:30AM Aug 31, 2014Observed: -0.37 ft at 5:45AM Aug 31, 2014Observed: -0.37 ft at 6:00AM Aug 31, 2014Observed: -0.37 ft at 6:15AM Aug 31, 2014Observed: -0.38 ft at 6:30AM Aug 31, 2014Observed: -0.38 ft at 6:45AM Aug 31, 2014Observed: -0.38 ft at 7:00AM Aug 31, 2014Observed: -0.38 ft at 7:15AM Aug 31, 2014Observed: -0.38 ft at 7:30AM Aug 31, 2014Observed: -0.38 ft at 7:45AM Aug 31, 2014Observed: -0.38 ft at 8:00AM Aug 31, 2014Observed: -0.38 ft at 8:15AM Aug 31, 2014Observed: -0.38 ft at 8:30AM Aug 31, 2014Observed: -0.38 ft at 8:45AM Aug 31, 2014Observed: -0.38 ft at 9:00AM Aug 31, 2014Observed: -0.38 ft at 9:15AM Aug 31, 2014Observed: -0.38 ft at 9:30AM Aug 31, 2014Observed: -0.37 ft at 9:45AM Aug 31, 2014Observed: -0.37 ft at 10:00AM Aug 31, 2014Observed: -0.37 ft at 10:15AM Aug 31, 2014Observed: -0.37 ft at 10:30AM Aug 31, 2014Observed: -0.37 ft at 10:45AM Aug 31, 2014Observed: -0.37 ft at 11:00AM Aug 31, 2014Observed: -0.37 ft at 11:15AM Aug 31, 2014Observed: -0.37 ft at 11:30AM Aug 31, 2014Observed: -0.37 ft at 11:45AM Aug 31, 2014Observed: -0.37 ft at 12:00PM Aug 31, 2014Observed: -0.37 ft at 12:15PM Aug 31, 2014Observed: -0.37 ft at 12:30PM Aug 31, 2014Observed: -0.37 ft at 12:45PM Aug 31, 2014Observed: -0.37 ft at 1:00PM Aug 31, 2014Observed: -0.37 ft at 1:15PM Aug 31, 2014Observed: -0.37 ft at 1:30PM Aug 31, 2014Observed: -0.37 ft at 1:45PM Aug 31, 2014Observed: -0.37 ft at 2:00PM Aug 31, 2014Observed: -0.37 ft at 2:15PM Aug 31, 2014Observed: -0.37 ft at 2:30PM Aug 31, 2014Observed: -0.37 ft at 2:45PM Aug 31, 2014Observed: -0.37 ft at 3:00PM Aug 31, 2014Observed: -0.37 ft at 3:15PM Aug 31, 2014Observed: -0.37 ft at 3:30PM Aug 31, 2014Observed: -0.37 ft at 3:45PM Aug 31, 2014Observed: -0.37 ft at 4:00PM Aug 31, 2014Observed: -0.37 ft at 4:15PM Aug 31, 2014Observed: -0.37 ft at 4:30PM Aug 31, 2014Observed: -0.37 ft at 4:45PM Aug 31, 2014Observed: -0.37 ft at 5:00PM Aug 31, 2014Observed: -0.37 ft at 5:15PM Aug 31, 2014Observed: -0.37 ft at 5:30PM Aug 31, 2014Observed: -0.36 ft at 5:45PM Aug 31, 2014Observed: -0.36 ft at 6:00PM Aug 31, 2014Observed: -0.36 ft at 6:15PM Aug 31, 2014Observed: -0.36 ft at 6:30PM Aug 31, 2014Observed: -0.36 ft at 6:45PM Aug 31, 2014Observed: -0.36 ft at 7:00PM Aug 31, 2014Observed: -0.35 ft at 7:15PM Aug 31, 2014Observed: -0.35 ft at 7:30PM Aug 31, 2014Observed: -0.35 ft at 7:45PM Aug 31, 2014Observed: -0.34 ft at 8:00PM Aug 31, 2014Observed: -0.34 ft at 8:15PM Aug 31, 2014Observed: -0.33 ft at 8:30PM Aug 31, 2014Observed: -0.33 ft at 8:45PM Aug 31, 2014Observed: -0.33 ft at 9:00PM Aug 31, 2014Observed: -0.33 ft at 9:15PM Aug 31, 2014Observed: -0.32 ft at 9:30PM Aug 31, 2014Observed: -0.32 ft at 9:45PM Aug 31, 2014Observed: -0.32 ft at 10:00PM Aug 31, 2014Observed: -0.32 ft at 10:15PM Aug 31, 2014Observed: -0.32 ft at 10:30PM Aug 31, 2014Observed: -0.32 ft at 10:45PM Aug 31, 2014Observed: -0.32 ft at 11:00PM Aug 31, 2014Observed: -0.31 ft at 11:15PM Aug 31, 2014Observed: -0.31 ft at 11:30PM Aug 31, 2014Observed: -0.31 ft at 11:45PM Aug 31, 2014Observed: -0.31 ft at 12:00AM Sep 01, 2014Observed: -0.31 ft at 12:15AM Sep 01, 2014Observed: -0.31 ft at 12:30AM Sep 01, 2014Observed: -0.31 ft at 12:45AM Sep 01, 2014Observed: -0.3 ft at 1:00AM Sep 01, 2014Observed: -0.3 ft at 1:15AM Sep 01, 2014Observed: -0.3 ft at 1:30AM Sep 01, 2014Observed: -0.29 ft at 1:45AM Sep 01, 2014Observed: -0.29 ft at 2:00AM Sep 01, 2014Observed: -0.28 ft at 2:15AM Sep 01, 2014Observed: -0.28 ft at 2:30AM Sep 01, 2014Observed: -0.26 ft at 2:45AM Sep 01, 2014Observed: -0.19 ft at 3:00AM Sep 01, 2014Observed: -0.15 ft at 3:15AM Sep 01, 2014Observed: -0.14 ft at 3:30AM Sep 01, 2014Observed: -0.14 ft at 3:45AM Sep 01, 2014Observed: -0.14 ft at 4:00AM Sep 01, 2014Observed: -0.13 ft at 4:15AM Sep 01, 2014Observed: -0.13 ft at 4:30AM Sep 01, 2014Observed: -0.13 ft at 4:45AM Sep 01, 2014Observed: -0.13 ft at 5:00AM Sep 01, 2014Observed: -0.13 ft at 5:15AM Sep 01, 2014Observed: -0.13 ft at 5:30AM Sep 01, 2014Observed: -0.13 ft at 5:45AM Sep 01, 2014Observed: -0.13 ft at 6:00AM Sep 01, 2014Observed: -0.13 ft at 6:15AM Sep 01, 2014Observed: -0.13 ft at 6:30AM Sep 01, 2014Observed: -0.13 ft at 6:45AM Sep 01, 2014Observed: -0.12 ft at 7:00AM Sep 01, 2014Observed: -0.12 ft at 7:15AM Sep 01, 2014Observed: -0.12 ft at 7:30AM Sep 01, 2014Observed: -0.12 ft at 7:45AM Sep 01, 2014Observed: -0.12 ft at 8:00AM Sep 01, 2014Observed: -0.12 ft at 8:15AM Sep 01, 2014Observed: -0.11 ft at 8:30AM Sep 01, 2014Observed: -0.11 ft at 8:45AM Sep 01, 2014Observed: -0.11 ft at 9:00AM Sep 01, 2014Observed: -0.11 ft at 9:15AM Sep 01, 2014Observed: -0.11 ft at 9:30AM Sep 01, 2014Observed: -0.11 ft at 9:45AM Sep 01, 2014Observed: -0.1 ft at 10:00AM Sep 01, 2014Observed: -0.1 ft at 10:15AM Sep 01, 2014Observed: -0.1 ft at 10:30AM Sep 01, 2014Observed: -0.1 ft at 10:45AM Sep 01, 2014Observed: -0.1 ft at 11:00AM Sep 01, 2014Observed: -0.1 ft at 11:15AM Sep 01, 2014Observed: -0.09 ft at 11:30AM Sep 01, 2014Observed: -0.09 ft at 11:45AM Sep 01, 2014Observed: -0.09 ft at 12:00PM Sep 01, 2014Observed: -0.09 ft at 12:15PM Sep 01, 2014Observed: -0.09 ft at 12:30PM Sep 01, 2014Observed: -0.09 ft at 12:45PM Sep 01, 2014Observed: -0.08 ft at 1:00PM Sep 01, 2014Observed: -0.08 ft at 1:15PM Sep 01, 2014Observed: -0.08 ft at 1:30PM Sep 01, 2014Observed: -0.08 ft at 1:45PM Sep 01, 2014Observed: -0.08 ft at 2:00PM Sep 01, 2014Observed: -0.08 ft at 2:15PM Sep 01, 2014Observed: -0.08 ft at 2:30PM Sep 01, 2014Observed: -0.07 ft at 2:45PM Sep 01, 2014Observed: -0.07 ft at 3:00PM Sep 01, 2014Observed: -0.07 ft at 3:15PM Sep 01, 2014Observed: -0.07 ft at 3:30PM Sep 01, 2014Observed: -0.07 ft at 3:45PM Sep 01, 2014Observed: -0.07 ft at 4:00PM Sep 01, 2014Observed: -0.07 ft at 4:15PM Sep 01, 2014Observed: -0.07 ft at 4:30PM Sep 01, 2014Observed: -0.07 ft at 4:45PM Sep 01, 2014Observed: -0.07 ft at 5:00PM Sep 01, 2014Observed: -0.06 ft at 5:15PM Sep 01, 2014Observed: -0.06 ft at 5:30PM Sep 01, 2014Observed: -0.06 ft at 5:45PM Sep 01, 2014Observed: -0.06 ft at 6:00PM Sep 01, 2014Observed: -0.06 ft at 6:15PM Sep 01, 2014Observed: -0.06 ft at 6:30PM Sep 01, 2014Observed: -0.06 ft at 6:45PM Sep 01, 2014Observed: -0.06 ft at 7:00PM Sep 01, 2014Observed: -0.06 ft at 7:15PM Sep 01, 2014Observed: -0.06 ft at 7:30PM Sep 01, 2014Observed: -0.06 ft at 7:45PM Sep 01, 2014Observed: -0.06 ft at 8:00PM Sep 01, 2014Observed: -0.06 ft at 8:15PM Sep 01, 2014Observed: -0.06 ft at 8:30PM Sep 01, 2014Observed: -0.06 ft at 8:45PM Sep 01, 2014Observed: -0.05 ft at 9:00PM Sep 01, 2014Observed: -0.05 ft at 9:15PM Sep 01, 2014Observed: -0.05 ft at 9:30PM Sep 01, 2014Observed: -0.05 ft at 9:45PM Sep 01, 2014Observed: -0.05 ft at 10:00PM Sep 01, 2014Observed: -0.05 ft at 10:15PM Sep 01, 2014Observed: -0.05 ft at 10:30PM Sep 01, 2014Observed: -0.05 ft at 10:45PM Sep 01, 2014Observed: -0.05 ft at 11:00PM Sep 01, 2014Observed: -0.05 ft at 11:15PM Sep 01, 2014Observed: -0.05 ft at 11:30PM Sep 01, 2014Observed: -0.05 ft at 11:45PM Sep 01, 2014Observed: -0.05 ft at 12:00AM Sep 02, 2014Observed: -0.05 ft at 12:15AM Sep 02, 2014Observed: -0.04 ft at 12:30AM Sep 02, 2014Observed: -0.04 ft at 12:45AM Sep 02, 2014Observed: -0.04 ft at 1:00AM Sep 02, 2014Observed: -0.04 ft at 1:15AM Sep 02, 2014Observed: -0.04 ft at 1:30AM Sep 02, 2014Observed: -0.04 ft at 1:45AM Sep 02, 2014Observed: -0.04 ft at 2:00AM Sep 02, 2014Observed: -0.04 ft at 2:15AM Sep 02, 2014Observed: -0.04 ft at 2:30AM Sep 02, 2014Observed: -0.04 ft at 2:45AM Sep 02, 2014Observed: -0.04 ft at 3:00AM Sep 02, 2014Observed: -0.04 ft at 3:15AM Sep 02, 2014Observed: -0.04 ft at 3:30AM Sep 02, 2014Observed: -0.04 ft at 3:45AM Sep 02, 2014Observed: -0.04 ft at 4:00AM Sep 02, 2014Observed: -0.04 ft at 4:15AM Sep 02, 2014Observed: -0.04 ft at 4:30AM Sep 02, 2014Observed: -0.04 ft at 4:45AM Sep 02, 2014Observed: -0.04 ft at 5:00AM Sep 02, 2014Observed: -0.04 ft at 5:15AM Sep 02, 2014Observed: -0.04 ft at 5:30AM Sep 02, 2014Observed: -0.04 ft at 5:45AM Sep 02, 2014Observed: -0.04 ft at 6:00AM Sep 02, 2014Observed: -0.04 ft at 6:15AM Sep 02, 2014Observed: -0.04 ft at 6:30AM Sep 02, 2014Observed: -0.04 ft at 6:45AM Sep 02, 2014Observed: -0.04 ft at 7:00AM Sep 02, 2014Observed: -0.04 ft at 7:15AM Sep 02, 2014Observed: -0.04 ft at 7:30AM Sep 02, 2014Observed: -0.04 ft at 7:45AM Sep 02, 2014Observed: -0.04 ft at 8:00AM Sep 02, 2014Observed: -0.04 ft at 8:15AM Sep 02, 2014Observed: -0.04 ft at 8:30AM Sep 02, 2014Observed: -0.04 ft at 8:45AM Sep 02, 2014Observed: -0.04 ft at 9:00AM Sep 02, 2014Observed: -0.04 ft at 9:15AM Sep 02, 2014Observed: -0.04 ft at 9:30AM Sep 02, 2014Observed: -0.04 ft at 9:45AM Sep 02, 2014Observed: -0.04 ft at 10:00AM Sep 02, 2014Observed: -0.04 ft at 10:15AM Sep 02, 2014Observed: -0.04 ft at 10:30AM Sep 02, 2014Observed: -0.04 ft at 10:45AM Sep 02, 2014Observed: -0.04 ft at 11:00AM Sep 02, 2014Observed: -0.04 ft at 11:15AM Sep 02, 2014Observed: -0.05 ft at 11:30AM Sep 02, 2014Forecast: 0 ft 2:00PM Sep 02, 2014Forecast: 0 ft 8:00PM Sep 02, 2014Forecast: 0.2 ft 2:00AM Sep 03, 2014Forecast: 0.3 ft 8:00AM Sep 03, 2014Highest Forecast: 0.4 ft 2:00PM Sep 03, 2014Highest Forecast: 0.4 ft 8:00PM Sep 03, 2014Highest Forecast: 0.4 ft 2:00AM Sep 04, 2014Highest Forecast: 0.4 ft 8:00AM Sep 04, 2014Highest Forecast: 0.4 ft 2:00PM Sep 04, 2014Highest Forecast: 0.4 ft 8:00PM Sep 04, 2014Highest Forecast: 0.4 ft 2:00AM Sep 05, 2014Forecast: 0.3 ft 8:00AM Sep 05, 2014Forecast: 0.2 ft 2:00PM Sep 05, 2014Forecast: 0.1 ft 8:00PM Sep 05, 2014Forecast: 0 ft 2:00AM Sep 06, 2014Forecast: 0 ft 8:00AM Sep 06, 2014Forecast: -0.1 ft 2:00PM Sep 06, 2014Forecast: -0.1 ft 8:00PM Sep 06, 2014Forecast: -0.2 ft 2:00AM Sep 07, 2014Forecast: -0.2 ft 8:00AM Sep 07, 2014OLNN6(plotting HGIRG) Graph Created (12:31PM Sep 2, 2014)ObservedForecast (issued 9:30AM Sep 2)Latest observed value: -0.05 ft at 11:30 AM EDT 2-Sep-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: 27-Aug-2014 7:12 PM
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