RIVER GAUGE · LONG TOM RIVER
Long Tom River at Monroe
Benton County, Oregon
Water level4.32 ft
Flow66 cfs
Last readingSep 16, 2026, 5:15 PM UTC (last recorded)
Action8.5 ft5,700 cfs
Minor flood9 ft6,800 cfs
Moderate flood11 ft12,100 cfs
Major flood12 ft15,000 cfs
The past week
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What floods at each level
- 12 ft
flooding impacts buildings in parts of Monroe, especially between Territorial Road and the river. Also expect flooding of the City Park, numerous farms in the area, and several rural roads.
- 11 ft
flooding threatens some buildings in Monroe between Territorial Road and the river, along with the City Park just north of Hwy 99 and numerous rural roads and farms.
- 10 ft
flooding impacts some roads and agricultural land in the vicinity of Monroe, and may threaten some homes in low-lying areas.
- 9 ft
flood waters threaten some roads and low-lying agricultural land in the vicinity of Monroe.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jan 14, 1974 | 10.42 ft | 10,500 cfs |
| Feb 6, 1996 | 10.08 ft | 9,560 cfs |
| Dec 25, 1964 | 10.06 ft | 9,520 cfs |
More on Long Tom River
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