Major Flood
12 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
11 ft
Minor Flood
9 ft
Action Stage
8.5 ft
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.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | 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 |
About This Gauge
USGS Site
NWS LID
MNRO3
River
Long Tom River
County
Benton, OR
Coordinates
44.3131°N, 123.2964°W
Get Flood Alerts for Long Tom River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Long Tom River at Monroe?
The Long Tom River at Monroe gauge is maintained by USGS (site 14170000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Long Tom River at Monroe?
The NWS-defined flood stage for Long Tom River at Monroe is 9 feet. Action stage begins at 8.5 feet. Moderate flooding starts at 11 feet, and major flooding at 12 feet.
How do I get alerts when Long Tom River rises?
Download StormCast free on Google Play, go to River Gauges, and add Long Tom River at Monroe to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Long Tom River at Monroe gauge located?
The gauge is located in Benton County, Oregon at coordinates 44.3131°N, 123.2964°W. USGS site number: 14170000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Gauge reading affected by reservoir operations.