Chehalis River Flow
As of 2026-08-02, the Chehalis River is flowing at a combined 780 cfs across 4 USGS streamgauges — 109% of normal for this time of year, versus a seasonal average of 718 cfs.
Total streamflow across the Chehalis River was last observed at 780 cfs, and is expected to yield approximately 1,548 acre-ft of water today; about 109% of normal. Average streamflow for this time of year is 718 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 398 cfs. However, the streamgauge with the highest stage along the river is the Chehalis River Near Doty with a gauge stage of 306.1 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.
River streamflow levels
Daily aggregate streamflow across every monitored gauge along the Chehalis River. Use the range buttons to zoom in on a specific period.
Total streamflow
Sum of all monitored streamgauges · daily
Every streamgauge along the Chehalis River
All 4 USGS gauges Snoflo tracks for this river, with current flow, stage, recent change, percent of normal, and the gauge's all-time min / max. Click any header to sort. Cells are heatmapped relative to the column min/max -- darker blue = higher.
| Streamgauge▾ | Streamflow (cfs)▾ | Gauge stage (ft)▾ | 24h Δ (%)▾ | % Normal▾ | Min (cfs)▾ | Max (cfs)▾ | Elevation (ft)▾ |
|---|---|---|---|---|---|---|---|
|
Chehalis River Near Doty
WA
USGS 12020000
|
32 | 306.10 | 7.1 | 91% | 15 | 17,800 | 324 |
|
Chehalis River Near Adna
WA
USGS 12021800
|
65 | 192.83 | -7.4 | 107% | 26 | 33,600 | 195 |
|
Chehalis River Near Grand Mound
WA
USGS 12027500
|
292 | 129.00 | -1.0 | 153% | 53 | 44,300 | 134 |
|
Chehalis River At Porter
WA
USGS 12031000
|
398 | 30.57 | 0.8 | 107% | 201 | 55,100 | 28 |
Maximum streamflow discharge by year
The single highest aggregate discharge recorded each year. Spotting the multi-year trend reveals droughts vs. wet cycles long before the headline daily flow does.
Annual peak discharge
From the river's full record · one point per water year
Streamflow elevation profile
Each bubble is one gauge along the river, plotted by current streamflow (x-axis) vs elevation (y-axis), sized by gauge stage. Reading top-to-bottom traces the river from headwaters down to its mouth -- you can see flow accumulate as elevation drops.
Elevation vs streamflow
One point per monitored gauge · bubble size = gauge stage
Chehalis River
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.
Recreation along the Chehalis River
Fishing access and paddle runs Snoflo tracks within the watershed.
Track the Chehalis River in the Snoflo app
Set per-gauge push alerts (e.g. "alert me when flow at the Russian R Nr Healdsburg crosses 5,000 cfs"), and Snoflo's iOS app pushes the moment USGS reports the crossing.
About the Chehalis River
How is the Chehalis River flowing right now?
As of 2026-08-02, the Chehalis River is flowing at a combined 780 cfs across its USGS streamgauges, about 109% of normal for this date. The live per-gauge breakdown and 24-hour trend are shown above.
Is the Chehalis River running high or low right now?
Check the percent-of-normal figure on this page: above 100% means the river is running higher than its seasonal average for the date, below 100% means lower. The per-gauge table shows which reaches are highest and lowest.
Where does the data for the Chehalis River come from?
Streamflow and gauge stage data are sourced from the U.S. Geological Survey (USGS) National Water Information System. The aggregate flow shown at the top of the page is computed by Snoflo as the sum of all monitored gauges along the river.
How is "percent of normal" calculated?
Today's aggregate streamflow is compared to the historical average aggregate streamflow on this calendar day across the river's full record. 100% means right on average; values above 100% indicate above-normal flow (wet year); values below indicate below-normal (dry year or drought).
Why are some gauges showing very different flows?
Gauges along a river measure flow at different points: headwater gauges read what's coming off the snowpack or mountain runoff; downstream gauges integrate everything upstream, including tributary inputs. Wide spreads usually mean a tributary is contributing significantly between gauges.
What's the elevation profile chart showing?
Each bubble is one gauge along the river, plotted by streamflow (x-axis) and elevation (y-axis), sized by gauge stage. Reading top-down traces the river from headwaters to mouth -- you can see flow build as elevation drops.
Can I get alerts when a specific gauge crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app on a per-gauge basis. Open any individual streamgauge from the table above and favorite it to set a discharge threshold.