Okanogan River near Tonasket
Washington — Water Level & Flood Stage
Located in Okanogan County, Washington on the Okanogan River. Live water level data from USGS gauge 12445000, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
18 ft
Moderate Flood
17 ft
Minor Flood
15 ft
Action Stage
14 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
22 ft
Severe flooding of surrounding cropland is likely. Damage is possible to numerous homes, outbuildings, irrigation systems and roads adjacent to the river. Water will be over Highway 97 near Ellisford and other areas between Tonasket and Oroville.
19.5 ft
Buildings along the river on Brooks Tract Road in East Omak will be flooded and utilities will be impacted.
19 ft
Water may be into homes along the river in and near Tonasket. Water will start to come over the banks at Brooks Track Rd in East Omak.
18 ft
Water will be approaching homes along the river in and near Tonasket. Major flooding of surrounding cropland is likely. Some homes and buildings adjacent to the river will experience some basement and first floor flooding.
17 ft
Low lying fields and pasture land in the flood plain along the Okanogan river valley, from Oroville to Okanogan, will be flooded. Some homes near the river in Okanogan may experience some basement flooding from seepage. Water will be between the railroad and Highway 97 near Ellisford to south Oroville. Water will be against the shoulder of Omak River Road across from Wanacut Creek.
16 ft
Pasture land between Rodeo Track Road and Benton Street, on the east side of the river near Omak, will begin to flood. Flooding increases between Tonasket and Oroville.
15.5 ft
Minor flooding in low lying areas and pasture lands is likely from Omak to Tonasket, especially near Ellisford.
15 ft
Minor flooding of low lying areas and pasture lands is possible between Highway 7 and 97 from Oroville to Riverside.
Impact statements from the National Weather Service, describing what typically happens at each water level.
Low-Water Impacts
600 cfs
Minimum base flow for August 15 and September 1st & 15th at this river gage, which is the lowest base flow of the year. The affected stream reach is from the confluence of Chewiliken Creek to confluence of Similkameen River. Water-rights junior to the base flows established in the rule may be restricted if streamflow drops below this value. For more information on this and the minimum base flows for other times in the year and for other reaches, refer to Washington Administrative Code (WAC) Chapter 173-549.
What happens as water levels drop, per the National Weather Service.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 1, 1972 | 22.54 ft | 44,700 cfs |
| Jun 1, 1972 | 22.54 ft | 44,700 cfs |
| May 30, 1948 | 21.79 ft | 40,900 cfs |
| May 30, 1948 | 21.79 ft | 40,900 cfs |
| May 11, 2018 | 19.71 ft | 32,036 cfs |
About This Gauge
USGS Site
NWS LID
TONW1
River
Okanogan River
County
Okanogan, WA
Coordinates
48.6324°N, 119.4617°W
Get Flood Alerts for Okanogan 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 Okanogan River near Tonasket?
The Okanogan River near Tonasket gauge is maintained by USGS (site 12445000) 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 Okanogan River near Tonasket?
The NWS-defined flood stage for Okanogan River near Tonasket is 15 feet. Action stage begins at 14 feet. Moderate flooding starts at 17 feet, and major flooding at 18 feet.
How do I get alerts when Okanogan River rises?
Download StormCast free on Google Play, go to River Gauges, and add Okanogan River near Tonasket to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Okanogan River near Tonasket gauge located?
The gauge is located in Okanogan County, Washington at coordinates 48.6324°N, 119.4617°W. USGS site number: 12445000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
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Source & Notes
Data provided by: Bpa, US Geological Survey, Observations courtesy of U.S. Geological Survey
- Gauge reading may be affected by ice. Forecast flows are unadjusted for ice.