About this river
East Fork Lewis River is an 8.5 mile river near St. Helens Marina in Oregon. Streamflow is measured at the USGS gauge East Fork Lewis River near Heisson, WA (site 14222500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1930 to 2026
East Fork Lewis River typically runs highest in January, at a median 1,030 cfs, and lowest in September, at 60 cfs. The highest flow on record for any single day is 21,000 cfs, in 1996.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 1,030 | 569 to 1,850 | |
| February | 865 | 553 to 1,510 | |
| March | 932 | 585 to 1,410 | |
| April | 829 | 580 to 1,140 | |
| May | 489 | 315 to 716 | |
| June | 274 | 172 to 407 | |
| July | 117 | 91 to 159 | |
| August | 65 | 56 to 82 | |
| September | 60 | 48 to 94 | |
| October | 129 | 67 to 311 | |
| November | 772 | 359 to 1,555 | |
| December | 1,020 | 599 to 1,880 |
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 96 years of record. Statistics published by the US Geological Survey for East Fork Lewis River near Heisson, WA (site 14222500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of East Fork Lewis River. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show East Fork Lewis 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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