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Hydrograph River at a Glance Download
Allegheny River at Olean Stage (ft)Flow (kcfs)Observed: -0.64 ft at 6:30AM Sep 27, 2014Observed: -0.64 ft at 6:45AM Sep 27, 2014Observed: -0.64 ft at 7:00AM Sep 27, 2014Observed: -0.64 ft at 7:15AM Sep 27, 2014Observed: -0.64 ft at 7:30AM Sep 27, 2014Observed: -0.64 ft at 7:45AM Sep 27, 2014Observed: -0.65 ft at 8:00AM Sep 27, 2014Observed: -0.65 ft at 8:15AM Sep 27, 2014Observed: -0.65 ft at 8:30AM Sep 27, 2014Observed: -0.65 ft at 8:45AM Sep 27, 2014Observed: -0.65 ft at 9:00AM Sep 27, 2014Observed: -0.65 ft at 9:15AM Sep 27, 2014Observed: -0.65 ft at 9:30AM Sep 27, 2014Observed: -0.65 ft at 9:45AM Sep 27, 2014Observed: -0.65 ft at 10:00AM Sep 27, 2014Observed: -0.65 ft at 10:15AM Sep 27, 2014Observed: -0.65 ft at 10:30AM Sep 27, 2014Observed: -0.65 ft at 10:45AM Sep 27, 2014Observed: -0.65 ft at 11:00AM Sep 27, 2014Observed: -0.65 ft at 11:15AM Sep 27, 2014Observed: -0.65 ft at 11:30AM Sep 27, 2014Observed: -0.65 ft at 11:45AM Sep 27, 2014Observed: -0.65 ft at 12:00PM Sep 27, 2014Observed: -0.65 ft at 12:15PM Sep 27, 2014Observed: -0.65 ft at 12:30PM Sep 27, 2014Observed: -0.65 ft at 12:45PM Sep 27, 2014Observed: -0.65 ft at 1:00PM Sep 27, 2014Observed: -0.65 ft at 1:15PM Sep 27, 2014Observed: -0.65 ft at 1:30PM Sep 27, 2014Observed: -0.65 ft at 1:45PM Sep 27, 2014Observed: -0.65 ft at 2:00PM Sep 27, 2014Observed: -0.65 ft at 2:15PM Sep 27, 2014Observed: -0.65 ft at 2:30PM Sep 27, 2014Observed: -0.65 ft at 2:45PM Sep 27, 2014Observed: -0.65 ft at 3:00PM Sep 27, 2014Observed: -0.65 ft at 3:15PM Sep 27, 2014Observed: -0.65 ft at 3:30PM Sep 27, 2014Observed: -0.65 ft at 3:45PM Sep 27, 2014Observed: -0.65 ft at 4:00PM Sep 27, 2014Observed: -0.65 ft at 4:15PM Sep 27, 2014Observed: -0.65 ft at 4:30PM Sep 27, 2014Observed: -0.65 ft at 4:45PM Sep 27, 2014Observed: -0.65 ft at 5:00PM Sep 27, 2014Observed: -0.65 ft at 5:15PM Sep 27, 2014Observed: -0.65 ft at 5:30PM Sep 27, 2014Observed: -0.65 ft at 5:45PM Sep 27, 2014Observed: -0.65 ft at 6:00PM Sep 27, 2014Observed: -0.65 ft at 6:15PM Sep 27, 2014Observed: -0.65 ft at 6:30PM Sep 27, 2014Observed: -0.65 ft at 6:45PM Sep 27, 2014Observed: -0.65 ft at 7:00PM Sep 27, 2014Observed: -0.65 ft at 7:15PM Sep 27, 2014Observed: -0.65 ft at 7:30PM Sep 27, 2014Observed: -0.65 ft at 7:45PM Sep 27, 2014Observed: -0.65 ft at 8:00PM Sep 27, 2014Observed: -0.65 ft at 8:15PM Sep 27, 2014Observed: -0.65 ft at 8:30PM Sep 27, 2014Observed: -0.65 ft at 8:45PM Sep 27, 2014Observed: -0.65 ft at 9:00PM Sep 27, 2014Observed: -0.65 ft at 9:15PM Sep 27, 2014Observed: -0.65 ft at 9:30PM Sep 27, 2014Observed: -0.65 ft at 9:45PM Sep 27, 2014Observed: -0.65 ft at 10:00PM Sep 27, 2014Observed: -0.66 ft at 10:15PM Sep 27, 2014Observed: -0.66 ft at 10:30PM Sep 27, 2014Observed: -0.66 ft at 10:45PM Sep 27, 2014Observed: -0.66 ft at 11:00PM Sep 27, 2014Observed: -0.66 ft at 11:15PM Sep 27, 2014Observed: -0.66 ft at 11:30PM Sep 27, 2014Observed: -0.66 ft at 11:45PM Sep 27, 2014Observed: -0.66 ft at 12:00AM Sep 28, 2014Observed: -0.67 ft at 12:15AM Sep 28, 2014Observed: -0.67 ft at 12:30AM Sep 28, 2014Observed: -0.67 ft at 12:45AM Sep 28, 2014Observed: -0.67 ft at 1:00AM Sep 28, 2014Observed: -0.67 ft at 1:15AM Sep 28, 2014Observed: -0.67 ft at 1:30AM Sep 28, 2014Observed: -0.67 ft at 1:45AM Sep 28, 2014Observed: -0.67 ft at 2:00AM Sep 28, 2014Observed: -0.67 ft at 2:15AM Sep 28, 2014Observed: -0.67 ft at 2:30AM Sep 28, 2014Observed: -0.68 ft at 2:45AM Sep 28, 2014Observed: -0.68 ft at 3:00AM Sep 28, 2014Observed: -0.68 ft at 3:15AM Sep 28, 2014Observed: -0.68 ft at 3:30AM Sep 28, 2014Observed: -0.68 ft at 3:45AM Sep 28, 2014Observed: -0.68 ft at 4:00AM Sep 28, 2014Observed: -0.68 ft at 4:15AM Sep 28, 2014Observed: -0.68 ft at 4:30AM Sep 28, 2014Observed: -0.68 ft at 4:45AM Sep 28, 2014Observed: -0.68 ft at 5:00AM Sep 28, 2014Observed: -0.68 ft at 5:15AM Sep 28, 2014Observed: -0.68 ft at 5:30AM Sep 28, 2014Observed: -0.68 ft at 5:45AM Sep 28, 2014Observed: -0.68 ft at 6:00AM Sep 28, 2014Observed: -0.68 ft at 6:15AM Sep 28, 2014Observed: -0.68 ft at 6:30AM Sep 28, 2014Observed: -0.68 ft at 6:45AM Sep 28, 2014Observed: -0.68 ft at 7:00AM Sep 28, 2014Observed: -0.68 ft at 7:15AM Sep 28, 2014Observed: -0.68 ft at 7:30AM Sep 28, 2014Observed: -0.68 ft at 7:45AM Sep 28, 2014Observed: -0.68 ft at 8:00AM Sep 28, 2014Observed: -0.68 ft at 8:15AM Sep 28, 2014Observed: -0.68 ft at 8:30AM Sep 28, 2014Observed: -0.68 ft at 8:45AM Sep 28, 2014Observed: -0.68 ft at 9:00AM Sep 28, 2014Observed: -0.68 ft at 9:15AM Sep 28, 2014Observed: -0.68 ft at 9:30AM Sep 28, 2014Observed: -0.68 ft at 9:45AM Sep 28, 2014Observed: -0.68 ft at 10:00AM Sep 28, 2014Observed: -0.68 ft at 10:15AM Sep 28, 2014Observed: -0.68 ft at 10:30AM Sep 28, 2014Observed: -0.68 ft at 10:45AM Sep 28, 2014Observed: -0.68 ft at 11:00AM Sep 28, 2014Observed: -0.68 ft at 11:15AM Sep 28, 2014Observed: -0.68 ft at 11:30AM Sep 28, 2014Observed: -0.68 ft at 11:45AM Sep 28, 2014Observed: -0.68 ft at 12:00PM Sep 28, 2014Observed: -0.68 ft at 12:15PM Sep 28, 2014Observed: -0.68 ft at 12:30PM Sep 28, 2014Observed: -0.68 ft at 12:45PM Sep 28, 2014Observed: -0.68 ft at 1:00PM Sep 28, 2014Observed: -0.68 ft at 1:15PM Sep 28, 2014Observed: -0.68 ft at 1:30PM Sep 28, 2014Observed: -0.68 ft at 1:45PM Sep 28, 2014Observed: -0.68 ft at 2:00PM Sep 28, 2014Observed: -0.68 ft at 2:15PM Sep 28, 2014Observed: -0.68 ft at 2:30PM Sep 28, 2014Observed: -0.68 ft at 2:45PM Sep 28, 2014Observed: -0.68 ft at 3:00PM Sep 28, 2014Observed: -0.68 ft at 3:15PM Sep 28, 2014Observed: -0.68 ft at 3:30PM Sep 28, 2014Observed: -0.68 ft at 3:45PM Sep 28, 2014Observed: -0.68 ft at 4:00PM Sep 28, 2014Observed: -0.68 ft at 4:15PM Sep 28, 2014Observed: -0.68 ft at 4:30PM Sep 28, 2014Observed: -0.68 ft at 4:45PM Sep 28, 2014Observed: -0.68 ft at 5:00PM Sep 28, 2014Observed: -0.68 ft at 5:15PM Sep 28, 2014Observed: -0.68 ft at 5:30PM Sep 28, 2014Observed: -0.68 ft at 5:45PM Sep 28, 2014Observed: -0.68 ft at 6:00PM Sep 28, 2014Observed: -0.68 ft at 6:15PM Sep 28, 2014Observed: -0.68 ft at 6:30PM Sep 28, 2014Observed: -0.68 ft at 6:45PM Sep 28, 2014Observed: -0.68 ft at 7:00PM Sep 28, 2014Observed: -0.68 ft at 7:15PM Sep 28, 2014Observed: -0.68 ft at 7:30PM Sep 28, 2014Observed: -0.68 ft at 7:45PM Sep 28, 2014Observed: -0.68 ft at 8:00PM Sep 28, 2014Observed: -0.68 ft at 8:15PM Sep 28, 2014Observed: -0.68 ft at 8:30PM Sep 28, 2014Observed: -0.68 ft at 8:45PM Sep 28, 2014Observed: -0.68 ft at 9:00PM Sep 28, 2014Observed: -0.68 ft at 9:15PM Sep 28, 2014Observed: -0.68 ft at 9:30PM Sep 28, 2014Observed: -0.68 ft at 9:45PM Sep 28, 2014Observed: -0.68 ft at 10:00PM Sep 28, 2014Observed: -0.68 ft at 10:15PM Sep 28, 2014Observed: -0.68 ft at 10:30PM Sep 28, 2014Observed: -0.68 ft at 10:45PM Sep 28, 2014Observed: -0.68 ft at 11:00PM Sep 28, 2014Observed: -0.68 ft at 11:15PM Sep 28, 2014Observed: -0.68 ft at 11:30PM Sep 28, 2014Observed: -0.68 ft at 11:45PM Sep 28, 2014Observed: -0.68 ft at 12:00AM Sep 29, 2014Observed: -0.68 ft at 12:15AM Sep 29, 2014Observed: -0.68 ft at 12:30AM Sep 29, 2014Observed: -0.68 ft at 12:45AM Sep 29, 2014Observed: -0.68 ft at 1:00AM Sep 29, 2014Observed: -0.68 ft at 1:15AM Sep 29, 2014Observed: -0.68 ft at 1:30AM Sep 29, 2014Observed: -0.68 ft at 1:45AM Sep 29, 2014Observed: -0.68 ft at 2:00AM Sep 29, 2014Observed: -0.68 ft at 2:15AM Sep 29, 2014Observed: -0.69 ft at 2:30AM Sep 29, 2014Observed: -0.69 ft at 2:45AM Sep 29, 2014Observed: -0.69 ft at 3:00AM Sep 29, 2014Observed: -0.69 ft at 3:15AM Sep 29, 2014Observed: -0.69 ft at 3:30AM Sep 29, 2014Observed: -0.69 ft at 3:45AM Sep 29, 2014Observed: -0.69 ft at 4:00AM Sep 29, 2014Observed: -0.69 ft at 4:15AM Sep 29, 2014Observed: -0.69 ft at 4:30AM Sep 29, 2014Observed: -0.69 ft at 4:45AM Sep 29, 2014Observed: -0.69 ft at 5:00AM Sep 29, 2014Observed: -0.69 ft at 5:15AM Sep 29, 2014Observed: -0.69 ft at 5:30AM Sep 29, 2014Observed: -0.69 ft at 5:45AM Sep 29, 2014Observed: -0.69 ft at 6:00AM Sep 29, 2014Observed: -0.69 ft at 6:15AM Sep 29, 2014Observed: -0.69 ft at 6:30AM Sep 29, 2014Observed: -0.69 ft at 6:45AM Sep 29, 2014Observed: -0.69 ft at 7:00AM Sep 29, 2014Observed: -0.69 ft at 7:15AM Sep 29, 2014Observed: -0.69 ft at 7:30AM Sep 29, 2014Observed: -0.69 ft at 7:45AM Sep 29, 2014Observed: -0.69 ft at 8:00AM Sep 29, 2014Observed: -0.69 ft at 8:15AM Sep 29, 2014Observed: -0.69 ft at 8:30AM Sep 29, 2014Observed: -0.69 ft at 8:45AM Sep 29, 2014Observed: -0.69 ft at 9:00AM Sep 29, 2014Observed: -0.69 ft at 9:15AM Sep 29, 2014Observed: -0.69 ft at 9:30AM Sep 29, 2014Observed: -0.69 ft at 9:45AM Sep 29, 2014Observed: -0.69 ft at 10:00AM Sep 29, 2014Observed: -0.7 ft at 10:15AM Sep 29, 2014Observed: -0.7 ft at 10:30AM Sep 29, 2014Observed: -0.7 ft at 10:45AM Sep 29, 2014Observed: -0.7 ft at 11:00AM Sep 29, 2014Observed: -0.7 ft at 11:15AM Sep 29, 2014Observed: -0.7 ft at 11:30AM Sep 29, 2014Observed: -0.7 ft at 11:45AM Sep 29, 2014Observed: -0.7 ft at 12:00PM Sep 29, 2014Observed: -0.7 ft at 12:15PM Sep 29, 2014Observed: -0.7 ft at 12:30PM Sep 29, 2014Observed: -0.7 ft at 12:45PM Sep 29, 2014Observed: -0.7 ft at 1:00PM Sep 29, 2014Observed: -0.7 ft at 1:15PM Sep 29, 2014Observed: -0.7 ft at 1:30PM Sep 29, 2014Observed: -0.7 ft at 1:45PM Sep 29, 2014Observed: -0.7 ft at 2:00PM Sep 29, 2014Observed: -0.7 ft at 2:15PM Sep 29, 2014Observed: -0.7 ft at 2:30PM Sep 29, 2014Observed: -0.71 ft at 2:45PM Sep 29, 2014Observed: -0.71 ft at 3:00PM Sep 29, 2014Observed: -0.71 ft at 3:15PM Sep 29, 2014Observed: -0.71 ft at 3:30PM Sep 29, 2014Observed: -0.71 ft at 3:45PM Sep 29, 2014Observed: -0.71 ft at 4:00PM Sep 29, 2014Observed: -0.71 ft at 4:15PM Sep 29, 2014Observed: -0.71 ft at 4:30PM Sep 29, 2014Observed: -0.71 ft at 4:45PM Sep 29, 2014Observed: -0.71 ft at 5:00PM Sep 29, 2014Observed: -0.71 ft at 5:15PM Sep 29, 2014Observed: -0.71 ft at 5:30PM Sep 29, 2014Observed: -0.71 ft at 5:45PM Sep 29, 2014Observed: -0.71 ft at 6:00PM Sep 29, 2014Observed: -0.71 ft at 6:15PM Sep 29, 2014Observed: -0.71 ft at 6:30PM Sep 29, 2014Observed: -0.71 ft at 6:45PM Sep 29, 2014Observed: -0.71 ft at 7:00PM Sep 29, 2014Observed: -0.71 ft at 7:15PM Sep 29, 2014Observed: -0.71 ft at 7:30PM Sep 29, 2014Observed: -0.71 ft at 7:45PM Sep 29, 2014Observed: -0.71 ft at 8:00PM Sep 29, 2014Observed: -0.71 ft at 8:15PM Sep 29, 2014Observed: -0.71 ft at 8:30PM Sep 29, 2014Observed: -0.71 ft at 8:45PM Sep 29, 2014Observed: -0.71 ft at 9:00PM Sep 29, 2014Observed: -0.71 ft at 9:15PM Sep 29, 2014Observed: -0.71 ft at 9:30PM Sep 29, 2014Observed: -0.71 ft at 9:45PM Sep 29, 2014Observed: -0.71 ft at 10:00PM Sep 29, 2014Observed: -0.71 ft at 10:15PM Sep 29, 2014Observed: -0.71 ft at 10:30PM Sep 29, 2014Observed: -0.71 ft at 10:45PM Sep 29, 2014Observed: -0.71 ft at 11:00PM Sep 29, 2014Observed: -0.71 ft at 11:15PM Sep 29, 2014Observed: -0.71 ft at 11:30PM Sep 29, 2014Observed: -0.71 ft at 11:45PM Sep 29, 2014Observed: -0.71 ft at 12:00AM Sep 30, 2014Observed: -0.71 ft at 12:15AM Sep 30, 2014Observed: -0.71 ft at 12:30AM Sep 30, 2014Observed: -0.71 ft at 12:45AM Sep 30, 2014Observed: -0.71 ft at 1:00AM Sep 30, 2014Observed: -0.71 ft at 1:15AM Sep 30, 2014Observed: -0.71 ft at 1:30AM Sep 30, 2014Observed: -0.71 ft at 1:45AM Sep 30, 2014Observed: -0.71 ft at 2:00AM Sep 30, 2014Observed: -0.71 ft at 2:15AM Sep 30, 2014Observed: -0.71 ft at 2:30AM Sep 30, 2014Observed: -0.71 ft at 2:45AM Sep 30, 2014Observed: -0.71 ft at 3:00AM Sep 30, 2014Observed: -0.71 ft at 3:15AM Sep 30, 2014Observed: -0.71 ft at 3:30AM Sep 30, 2014Observed: -0.71 ft at 3:45AM Sep 30, 2014Observed: -0.71 ft at 4:00AM Sep 30, 2014Observed: -0.71 ft at 4:15AM Sep 30, 2014Observed: -0.71 ft at 4:30AM Sep 30, 2014Observed: -0.71 ft at 4:45AM Sep 30, 2014Observed: -0.71 ft at 5:00AM Sep 30, 2014Observed: -0.71 ft at 5:15AM Sep 30, 2014Observed: -0.71 ft at 5:30AM Sep 30, 2014Forecast: -0.8 ft 8:00AM Sep 30, 2014Forecast: -0.8 ft 2:00PM Sep 30, 2014Forecast: -0.8 ft 8:00PM Sep 30, 2014Forecast: -0.8 ft 2:00AM Oct 01, 2014Forecast: -0.8 ft 8:00AM Oct 01, 2014Forecast: -0.8 ft 2:00PM Oct 01, 2014Forecast: -0.9 ft 8:00PM Oct 01, 2014Forecast: -0.9 ft 2:00AM Oct 02, 2014Forecast: -0.9 ft 8:00AM Oct 02, 2014Forecast: -0.9 ft 2:00PM Oct 02, 2014Forecast: -0.9 ft 8:00PM Oct 02, 2014Forecast: -0.9 ft 2:00AM Oct 03, 2014Forecast: -0.9 ft 8:00AM Oct 03, 2014Forecast: -0.9 ft 2:00PM Oct 03, 2014Forecast: -0.9 ft 8:00PM Oct 03, 2014Forecast: -0.9 ft 2:00AM Oct 04, 2014Forecast: -0.9 ft 8:00AM Oct 04, 2014Forecast: -0.9 ft 2:00PM Oct 04, 2014Forecast: -0.9 ft 8:00PM Oct 04, 2014OLNN6(plotting HGIRG) Graph Created (6:16AM Sep 30, 2014)ObservedForecast (issued 8:40PM Sep 29)Latest observed value: -0.71 ft at 5:30 AM EDT 30-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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