Long Tom River at Monroe, OR
USGS Site No: 14170000 • Long Tom River • Benton County, OR
Long Tom River at Monroe, OR on the Long Tom River is currently at 81 cfs (Low — 15th percentile for this date) . Gage height: 4.36 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 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 | 35 | |
| 25th | Low threshold | 166 | Today: 81 cfs |
| 50th (Median) | Normal (median) | 799 | |
| 75th | High threshold | 980 | |
| 95th | Very High threshold | 1,760 |
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 | 44 | — |
| May 27, 2026 | 51 | — |
| May 26, 2026 | 62 | — |
| May 25, 2026 | 63 | — |
| May 24, 2026 | 104 | — |
| May 23, 2026 | 101 | — |
| May 22, 2026 | 103 | — |
| May 21, 2026 | 111 | — |
| May 20, 2026 | 109 | — |
| May 19, 2026 | 106 | — |
| May 18, 2026 | 121 | — |
| May 17, 2026 | 117 | — |
| May 16, 2026 | 101 | — |
| May 15, 2026 | 84 | — |
| Apr 20, 2026 | 201 | — |
| Apr 19, 2026 | 220 | — |
| Apr 18, 2026 | 245 | — |
| Apr 17, 2026 | 307 | — |
| Apr 16, 2026 | 409 | — |
| Apr 15, 2026 | 294 | — |
| Apr 14, 2026 | 176 | — |
| Apr 13, 2026 | 221 | — |
| Apr 12, 2026 | 332 | — |
| Apr 11, 2026 | 177 | — |
| Apr 10, 2026 | 142 | — |
| Apr 9, 2026 | 145 | — |
| Apr 8, 2026 | 154 | — |
| Apr 7, 2026 | 169 | — |
| Apr 6, 2026 | 178 | — |
| Apr 5, 2026 | 190 | — |
Station Information
- USGS Site No
- 14170000
- State
- OR
- County
- Benton County
- Coordinates
- 44.3128, -123.2964
- Drainage Area
- 391 mi²
- Datum (ft)
- 273.7
- HUC Code
- 17090003
Flood Stage Thresholds
- Action Stage
- 8.5 ft
- Flood Stage
- 9.0 ft
- Moderate Flood
- 11.0 ft
- Major Flood
- 12.0 ft
Currently 4.64 ft below flood stage.
Recent Extremes
- Max discharge
-
3,270 cfsDec 19, 2025
- Min discharge
-
33 cfsAug 27, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Willamette River at Harrisburg, ORNormal6.7 mi · 5,840 cfs
-
Long Tom River Near Alvadore, ORVery Low13.1 mi · 72 cfs
-
Marys River Near Philomath, ORNormal14.8 mi · 78 cfs
-
Willamette River at Corvallis, ORLow17.6 mi · 6,540 cfs
-
Mckenzie River Near Coburg, ORNormal18.5 mi · 2,780 cfs