Allegheny River at Olean NY

Cattaraugus County, New York · USGS gauge 03010820 · NWS OLNN6 · Allegheny River flood status · New York river levels

Is Allegheny River at Olean NY flooding right now?

Allegheny River at Olean NY measured 3.91 ft on 2026-09-11 01:30:00 UTC. That observation was 8.1 ft below its 12 ft flood stage. This is the latest available reading, not a guarantee of current conditions.

Gauge height

3.91 ft

as of 34 min ago

Streamflow

2,180 cfs

data refreshed 2 min ago

Minor flooding here begins at 12 ft, with major flooding at 23 ft. The highest crest on record was 26.2 ft on Fri, Jun 23, 1972.

Flood forecast

NWS forecast, issued 13 hours ago. Forecasts are issued for select river points and update through the day.

Flood stages at this gauge

Category	Stage	Current distance
Action	10 ft	6.1 ft below
Minor flood	12 ft	8.1 ft below
Moderate flood	17 ft	13.1 ft below
Major flood	23 ft	19.1 ft below

New to these numbers? What does flood stage mean? · How to read a river gauge · Why is the river rising?

Highest crests on record

Stage	Date
26.2 ft	1972-06-23
23.3 ft	1942-07-19
19.5 ft	1956-03-08
19.3 ft	1946-05-29
18.6 ft	1996-01-20

Last 7 days

Past 7 days · 1.76–4.60 ft

Nearby gauges

Gauge	Distance	County
Dodge Creek at Portville NY	6.1 mi	Cattaraugus County
Allegheny River at Eldred, PA	8.2 mi	McKean County
Tunungwant Creek near South Bradford, PA	12.2 mi	McKean County
Root Creek at Davis Street at Bolivar NY	14.8 mi	Allegany County
Allegheny River at Salamanca NY	14.8 mi	Cattaraugus County

Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.

Sources: USGS monitoring location · NWS gauge & forecast