Allegheny River at Olean
Critical Stages
10' - Action
12' - Flood
17' - Moderate
23' - Major
Latest Observation
Updated: 10:30 AM EST 12/12/25
Status: No Flooding
Stage: 2.51 ft
Flow: 0.992 kcfs
Forecast
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 1 PM 12/12 | 2.4 | 0.922 |
| 7 PM 12/12 | 2.4 | 0.922 |
| 1 AM 12/13 | 2.3 | 0.86 |
| 7 AM 12/13 | 2.3 | 0.86 |
| 1 PM 12/13 | 2.2 | 0.795 |
| 7 PM 12/13 | 2.2 | 0.795 |
| 1 AM 12/14 | 2.1 | 0.726 |
| 7 AM 12/14 | 2.1 | 0.726 |
| 1 PM 12/14 | 2 | 0.658 |
| 7 PM 12/14 | 2 | 0.658 |
| 1 AM 12/15 | 2 | 0.658 |
| 7 AM 12/15 | 1.9 | 0.591 |
| 1 PM 12/15 | 1.9 | 0.591 |
| 7 PM 12/15 | 1.9 | 0.591 |
| 1 AM 12/16 | 1.9 | 0.591 |
| 7 AM 12/16 | 1.8 | 0.527 |
| 1 PM 12/16 | 1.8 | 0.527 |
| 7 PM 12/16 | 1.8 | 0.527 |
| 1 AM 12/17 | 1.8 | 0.527 |
| 7 AM 12/17 | 1.8 | 0.527 |
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 10:30 AM 12/12 | 2.51 | 0.992 |
| 10:15 AM 12/12 | 2.51 | 0.992 |
| 10:00 AM 12/12 | 2.5 | 0.986 |
| 9:45 AM 12/12 | 2.5 | 0.986 |
| 9:30 AM 12/12 | 2.49 | 0.979 |
| 9:15 AM 12/12 | 2.49 | 0.979 |
| 9:00 AM 12/12 | 2.49 | 0.979 |
| 8:45 AM 12/12 | 2.48 | 0.973 |
| 8:30 AM 12/12 | 2.48 | 0.973 |
| 8:15 AM 12/12 | 2.49 | 0.979 |
| 8:00 AM 12/12 | 2.49 | 0.979 |
| 7:45 AM 12/12 | 2.49 | 0.979 |
| 7:30 AM 12/12 | 2.49 | 0.979 |
| 7:15 AM 12/12 | 2.49 | 0.979 |
| 7:00 AM 12/12 | 2.49 | 0.979 |
| 6:45 AM 12/12 | 2.49 | 0.979 |
| 6:30 AM 12/12 | 2.5 | 0.986 |
| 6:15 AM 12/12 | 2.5 | 0.986 |
| 6:00 AM 12/12 | 2.5 | 0.986 |
| 5:45 AM 12/12 | 2.51 | 0.992 |
| 5:30 AM 12/12 | 2.51 | 0.992 |
| 5:15 AM 12/12 | 2.51 | 0.992 |
| 5:00 AM 12/12 | 2.52 | 0.999 |
| 4:45 AM 12/12 | 2.52 | 0.999 |
| 4:30 AM 12/12 | 2.52 | 0.999 |
| 4:15 AM 12/12 | 2.53 | 1.01 |
| 4:00 AM 12/12 | 2.53 | 1.01 |
| 3:45 AM 12/12 | 2.53 | 1.01 |
| 3:30 AM 12/12 | 2.53 | 1.01 |
| 3:15 AM 12/12 | 2.53 | 1.01 |
25' -
Extreme flood, extensive residential flooding begins, especially upstream from Union Street bridge. Some evacuations necessary. Serious flooding upstream through Portville. Dikes overwhelmed.
23' -
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' -
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' -
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' -
Action stage, high flows. No flooding.
| Date | Stage (ft) |
|---|---|
| Jun 23, 1972 | 26.2 |
| Jul 19, 1942 | 23.3 |
| Mar 8, 1956 | 19.5 |
| May 29, 1946 | 19.3 |
| Jan 20, 1996 | 18.6 |
| Mar 23, 1948 | 18.5 |
| Nov 27, 1950 | 18.1 |
| Jan 22, 1959 | 18 |
| Jun 22, 1989 | 17.84 |
| Apr 7, 1947 | 17.8 |
| Dec 3, 2010 | 17.74 |
| Apr 2, 1993 | 17 |
| Feb 19, 1976 | 16.4 |
| Mar 16, 2007 | 15.6 |
| Jan 10, 1998 | 15.5 |
| Feb 22, 1981 | 15.4 |
| Jan 13, 2017 | 14.17 |
| Jan 14, 2018 | 13.91 |
| Mar 22, 2003 | 13.6 |
| Feb 19, 2022 | 13.33 |
Data provided by the National Weather Service.
