Okanogan River River Levels

Last Updated: December 23, 2025

The Okanogan River is a 115-mile-long river that flows through Okanogan County in Washington state.


Summary

Total streamflow across the Okanogan River was last observed at 11,061 cfs, and is expected to yield approximately 21,939 acre-ft of water today; about 285% of normal. River levels are high. Average streamflow for this time of year is 3,875 cfs, with recent peaks last observed on 2018-05-12 when daily discharge volume was observed at 69,180 cfs.

Maximum discharge along the river is currently at the Okanogan River At Malott reporting a streamflow rate of 5,410 cfs. However, the streamgauge with the highest stage along the river is the Okanogan River Near Tonasket with a gauge stage of 8.6 ft. This river is monitored from 3 different streamgauging stations along the Okanogan River, the highest being situated at an altitude of 887 ft, the Okanogan River At Oroville.

River Details

Last Updated 2025-12-22
Discharge Volume 21,939 ACRE-FT
Streamflow 11,061.0 cfs
-1340.0 cfs (-10.81%)
Percent of Normal 285.42%
Maximum 69,180.0 cfs
2018-05-12
Seasonal Avg 3,875 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Okanogan River At Oroville
USGS 12439500
341 cfs 6.35 ft 0
Okanogan River Near Tonasket
USGS 12445000
5310 cfs 8.6 ft -10.76
Okanogan River At Malott
USGS 12447200
5410 cfs 6.41 ft -11.46
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Okanogan River (known as the Okanagan River in Canada) is a tributary of the Columbia River, approximately 115 mi (185 km) long, in southern British Columbia and north central Washington. It drains a scenic plateau region called the Okanagan Country east of the Cascade Range and north and west of the Columbia, and also the Okanagan region of British Columbia. The Canadian portion of the river has been channelized since the mid-1950s.