About this river
Chehalis River is a 16.7 mile river near South Sound Kayak Tours in Washington. Streamflow is measured at the USGS gauge Chehalis River at Porter, WA (site 12031000). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1953 to 2026
Chehalis River typically runs highest in January, at a median 7,220 cfs, and lowest in August, at 372 cfs. The highest flow on record for any single day is 58,200 cfs, in 2008.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 7,220 | 4,230 to 13,100 | |
| February | 5,850 | 3,870 to 9,460 | |
| March | 5,120 | 3,530 to 8,260 | |
| April | 3,880 | 2,755 to 5,700 | |
| May | 1,740 | 1,340 to 2,450 | |
| June | 1,095 | 764 to 1,455 | |
| July | 558 | 463 to 690 | |
| August | 372 | 312 to 450 | |
| September | 406 | 329 to 510 | |
| October | 633 | 416 to 1,210 | |
| November | 3,755 | 1,580 to 7,100 | |
| December | 6,330 | 3,740 to 12,000 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 71 years of record. Statistics published by the US Geological Survey for Chehalis River at Porter, WA (site 12031000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Chehalis River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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