Allegheny River at Olean
Cattaraugus County, New York
The past week
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What floods at each level
- 25 ft
Extreme flood, extensive residential flooding begins, especially upstream from Union Street bridge. Some evacuations necessary. Serious flooding upstream through Portville. Dikes overwhelmed.
- 23 ft
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 ft
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 ft
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 ft
Action stage, high flows. No flooding.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 22, 1972 | 26.2 ft | 60,000 cfs |
| Jul 18, 1942 | 23.3 ft | 44,000 cfs |
| Mar 7, 1956 | 19.5 ft | 30,700 cfs |
More on Allegheny River
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