Allegheny River at Olean
Flood levels
Official flood levels at this gauge: action stage begins at 10.0 ft; minor flooding begins at 12.0 ft; moderate flooding begins at 17.0 ft; major flooding begins at 23.0 ft.
| Action stage | 10.0 ft |
|---|---|
| Minor flooding | 12.0 ft |
| Moderate flooding | 17.0 ft |
| Major flooding | 23.0 ft |
Highest recorded crests
- 26.2 ft on Jun 23, 1972 (historic crest)
- 23.3 ft on Jul 19, 1942 (historic crest)
- 19.5 ft on Mar 8, 1956 (historic crest)
- 19.3 ft on May 29, 1946 (historic crest)
What the water does
National Weather Service impact statements for this gauge, in the Weather Service's own words.
| 10.0 ft | Action stage, high flows. No flooding. |
|---|---|
| 12.0 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. |
| 17.0 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. |
| 23.0 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. |
| 25.0 ft | Extreme flood, extensive residential flooding begins, especially upstream from Union Street bridge. Some evacuations necessary. Serious flooding upstream through Portville. Dikes overwhelmed. |
Forecast office: NWS Buffalo · River Forecast Center: Ohio River Forecast Center.
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Nearby stations and gauges
- Dodge Creek (NY) above Portville NWS gauge · 6.1 mi
- Allegheny River at Eldred NWS gauge · 8.2 mi
- Tunungwant Creek near South Bradford NWS gauge · 12.1 mi
- Allegheny River at Salamanca NWS gauge · 14.7 mi
- Root Creek at Bolivar NWS gauge · 14.8 mi
- Oswayo Creek at Shinglehouse NWS gauge · 15.1 mi