South Fork Stillaguamish River near Granite Falls, WA
River level and flood forecast · Snohomish County
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 4 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts South Fork Stillaguamish River near Granite Falls to flood, when it floods, and when it's over.
Flood stages
| Action stage | 12.9 ft |
| Record crest (November 6, 2006) | 22.82 ft |
What floods at each level
From the National Weather Service, highest first.
- 18 ftthe South Fork Stillaguamish River will cause flooding of Jordan Road...the Robe Valley area upstream from Granite Falls...and Granite Falls downstream to the Blue Spruce area. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the South Fork Stillaguamish River Basin. A stage of 18 feet corresponds to Phase 4 in the Snohomish County Flood Warning System.
- 16 ftthe South Fork Stillaguamish River will cause flooding in Granite Falls downstream to the Blue Spruce area and Jordan Road. A stage of 16 feet corresponds to Phase 3 in the Snohomish County Flood Warning System.
- 14 ftthe South Fork Stillaguamish River will cause flooding along the river and tributaries. A stage of 14 feet corresponds to Phase 2 in the Snohomish County Flood Warning System.
Highest crests on record
- 22.82 ft — November 6, 2006
- 21.17 ft — October 20, 2003
- 20.35 ft — November 17, 2015
- 19.7 ft — February 26, 1932
- 18.5 ft — December 12, 2010
Recent crests: 17.55 ft (December 5, 2023) · 14.04 ft (November 5, 2022) · 15.04 ft (March 1, 2022) · 13.33 ft (January 12, 2022) · 14.33 ft (October 29, 2021)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GFLW1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.