Allegheny River at Olean NY
USGS Site No: 03010820 • Allegheny River • Cattaraugus County, NY
Allegheny River at Olean NY on the Allegheny River is currently at 1,510 cfs (Normal — 64th percentile for this date) . Gage height: 3.10 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 27 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 177 | |
| 25th | Low threshold | 255 | |
| 50th (Median) | Normal (median) | 749 | |
| 75th | High threshold | 2,130 | Today: 1,510 cfs |
| 95th | Very High threshold | 0 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 1,810 | — |
| May 27, 2026 | 2,040 | — |
| May 26, 2026 | 2,470 | — |
| May 25, 2026 | 2,670 | — |
| May 24, 2026 | 2,250 | — |
| May 23, 2026 | 1,400 | — |
| May 22, 2026 | 1,140 | — |
| May 21, 2026 | 1,280 | — |
| May 20, 2026 | 1,420 | — |
| May 19, 2026 | 1,610 | — |
| May 18, 2026 | 1,880 | — |
| May 17, 2026 | 2,170 | — |
| May 16, 2026 | 2,500 | — |
| May 15, 2026 | 3,020 | — |
| Apr 21, 2026 | 4,760 | — |
| Apr 20, 2026 | 5,830 | — |
| Apr 19, 2026 | 6,510 | — |
| Apr 18, 2026 | 5,850 | — |
| Apr 17, 2026 | 7,090 | — |
| Apr 16, 2026 | 4,510 | — |
| Apr 15, 2026 | 2,730 | — |
| Apr 14, 2026 | 2,190 | — |
| Apr 13, 2026 | 2,290 | — |
| Apr 12, 2026 | 2,640 | — |
| Apr 11, 2026 | 3,090 | — |
| Apr 10, 2026 | 3,410 | — |
| Apr 9, 2026 | 4,020 | — |
| Apr 8, 2026 | 5,040 | — |
| Apr 7, 2026 | 6,310 | — |
| Apr 6, 2026 | 7,250 | — |
Station Information
- USGS Site No
- 03010820
- State
- NY
- County
- Cattaraugus County
- Coordinates
- 42.0724, -78.4509
- Drainage Area
- 1,168 mi²
- Datum (ft)
- 1,399.5
- HUC Code
- 05010001
Flood Stage Thresholds
- Action Stage
- 10.0 ft
- Flood Stage
- 12.0 ft
- Moderate Flood
- 17.0 ft
- Major Flood
- 23.0 ft
Currently 8.90 ft below flood stage.
Recent Extremes
- Max discharge
-
11,200 cfsMar 8, 2026
- Min discharge
-
42 cfsSep 21, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Allegheny River at Eldred, PANormal8.2 mi · 761 cfs
-
Allegheny River at Salamanca NYHigh14.8 mi · 2,060 cfs
-
Oswayo Creek at Shinglehouse, PANormal15.1 mi · 116 cfs
-
Allegheny River at Port Allegany, PANormal19.3 mi · 395 cfs
-
Kinzua Creek Near Guffey, PANormal25.2 mi · 37 cfs