River Levels Streamgages Weather

Total streamflow across the Chehalis River was last observed at 874 cfs, and is expected to yield approximately 1,734 acre-ft of water today; about 88% of normal. Average streamflow for this time of year is 988 cfs, with recent peaks last observed on 2022-01-08 when daily discharge volume was observed at 112,610 cfs.

Maximum discharge along the river is currently at the Chehalis River At Porter reporting a streamflow rate of 475 cfs. However, the streamgauge with the highest stage along the river is the Chehalis River Near Doty with a gauge stage of 306.4 ft. This river is monitored from 4 different streamgauging stations along the Chehalis River, the highest being situated at an altitude of 324 ft, the Chehalis River Near Doty.

The Chehalis River is a 126-mile long river that flows through western Washington State. It has two main tributaries, the East Fork Chehalis and the West Fork Chehalis. The river was an important resource for Native American tribes such as the Chehalis and Chinook for centuries before European settlers arrived. Today, the Chehalis River is used for a variety of recreational activities such as fishing, kayaking, and camping. It is also used for agricultural purposes, with farms and pastureland located along its banks. The river is home to several reservoirs and dams, including the Mossyrock and Mayfield Dams, which provide hydroelectric power and flood control for surrounding communities. Despite these measures, the Chehalis River is prone to flooding during heavy rain events.

July 20, 2024







Last Updated 2024-07-20
Discharge Volume 1,734 ACRE-FT
Streamflow 874.4 cfs
-26.4 cfs (-2.93%)
Percent of Normal 88.47%
Maximum 112,610.0 cfs
Seasonal Avg 988 cfs
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Chehalis River Near Doty
USGS 12020000
50 cfs 306.4 ft -2.7
Chehalis River Near Adna
USGS 12021800
121 cfs 192.97 ft -1.63
Chehalis River Near Grand Mound
USGS 12027500
228 cfs 129.11 ft -2.56
Chehalis River At Porter
USGS 12031000
475 cfs 30.77 ft -3.46

Regional Streamflow

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Historical River Levels

The Chehalis River ( shə-HAY-lis)
is a river in Washington in the United States. It originates in several forks in southwestern Washington, flows east, then north, then west, in a large curve, before emptying into Grays Harbor, an estuary of the Pacific Ocean.
It was once much larger during the Ice Age when the tongue of the glacial ice sheet covering the Puget Sound terminated near Olympia and glacial runoff formed a large torrest of meltwater. This carved a large oversized valley that is much larger than the current river could have produced. The river's mouth was out near current Westport until rising sea levels at the end of the ice age flooded the broad Chehalis Valley to for a ria, known today as Grays Harbor.

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