Okanogan River near Tonasket

1. 22.00 ftSevere 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.
2. 19.50 ftBuildings along the river on Brooks Tract Road in East Omak will be flooded and utilities will be impacted.
3. 19.00 ftWater 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.
4. 18.00 ftWater 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.
5. 17.00 ftLow 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.
6. 16.00 ftPasture 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.
7. 15.50 ftMinor flooding in low lying areas and pasture lands is likely from Omak to Tonasket, especially near Ellisford.
8. 15.00 ftMinor flooding of low lying areas and pasture lands is possible between Highway 7 and 97 from Oroville to Riverside.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 21, 2026.

Most recent crests

• May 18, 2024: 10.61 ft
• May 7, 2023: 14.38 ft
• June 7, 2022: 14.15 ft
• November 17, 2021: 15.48 ft
• June 2, 2020: 15.81 ft
• May 18, 2019: 11.71 ft
• May 12, 2018: 19.71 ft
• June 2, 2017: 17.04 ft
• May 14, 2017: 15.34 ft
• April 25, 2016: 15.73 ft

• UpstreamOkanogan River at Oroville
• DownstreamOkanogan River at Malott
• Bonaparte Creek at Tonasket
• Conconully Lake at Conconully - Salmon Lake Dam
• North Fork Salmon Creek at Conconully
• Conconully Reservoir at Conconully Dam
• West Fork Salmon Creek at Conconully
• Salmon Creek at Okanogan
• Omak Creek at Omak

Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round. Gauge reading may be affected by ice. Forecast flows are unadjusted for ice.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.