| 23.0 | EXTREME FLOOD...EXTENSIVE RESIDENTIAL FLOODING BEGINS...ESPECIALLY UPSTREAM FROM UNION STREET BRIDGE. SOME EVACUATIONS NECESSARY. SERIOUS FLOODING UPSTREAM THROUGH PORTVILLE. DIKES OVERWHELMED. | | 21.0 | 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. | | 15.0 | THERE IS MODERATE FLOODING. 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. | | 12.0 | MINOR FLOOD...WATER OVERFLOWS ONTO EAST RIVERSIDE DRIVE 1 TO 3 MILES UPSTREAM FROM UNION STREET BRIDGE. | | 10.0 | FLOOD STAGE...FARM LANDS AND ROADS SEVERAL MILES FROM OLEAN FLOOD SLIGHTLY. NO DAMAGES. |
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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
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Low water records are unavailable.
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