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North Fork Stillaguamish River near Arlington, WA

River level and flood forecast · Snohomish County

Normal1.5 ftas of Mon 9:15 PM

The river is 11.5 ft below flood stage (13 ft).

Forecast to rise to 2.4 ft Mon 5 PM, below the 13 ft flood stage.

Flow: 197 cubic feet per second (USGS).

The last 7 days and the forecast

-505101520TueThuSatMonWedFriSunAction 10.7 ftFlood 13 ftModerate 14 ftMajor 15 ftNowObserved (ft)NWS forecast

NWS forecast issued Mon, Oct 12, 8:50 AM. Forecasts change as rain falls and as upstream water arrives.

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Flood stages

Major flood stage15 ft
Moderate flood stage14 ft
Flood stage13 ft
Action stage10.7 ft
Record crest (December 12, 2010)15.59 ft

What floods at each level

From the National Weather Service, highest first.

  • 15 ftthe North Fork Stillaguamish River will cause extensive flooding from near Darrington downstream to the confluence with the South Fork Stillaguamish River...including Oso...Cicero...Swede Heaven and SR 530. Flood waters will also cause riverbank erosion. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the N Fork Stillaguamish River Basin. A stage of 15 feet corresponds to Phase 4 in the Snohomish County Flood Warning System.
  • 14 ftthe North Fork Stillaguamish River will cause flooding in the Cicero and Swede Heaven areas...Oso Loop Road...and SR 530. Flood waters will also cause riverbank erosion. A stage of 14 feet corresponds to Phase 3 in the Snohomish County Flood Warning System.
  • 13 ftthe North Fork Stillaguamish River will cause flooding of Oso Loop Road and cause minor riverbank erosion. A stage of 13 feet corresponds to Phase 2 in the Snohomish County Flood Warning System.

Highest crests on record

  1. 15.59 ft — December 12, 2010
  2. 15.21 ft — December 5, 2023
  3. 15.21 ft — December 5, 2023
  4. 15.2 ft — November 24, 1990
  5. 15.12 ft — January 8, 2009

Recent crests: 15.21 ft (December 5, 2023) · 15.21 ft (December 5, 2023) · 13.09 ft (November 5, 2022) · 14.57 ft (February 1, 2020) · 13.38 ft (January 7, 2020)

Up and down the river, and nearby

See it on the live map →Radar & warnings for Snohomish CountyNWS gauge pageUSGS gauge 12167000

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ARGW1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.