Change In The River Forecast And Warning Point For The South Fork Stillaguamish River

This flood season there is a change in the flood services for the
National Weather Service Seattle`s Hydrologic Service Area for the
South Fork Stillaguamish River in Snohomish County. Effective today,
the river forecast point/flood warning point on the South Fork
Stillaguamish River has been moved from the stream gauge at Granite
Falls to the stream gauge at Jordan Road Bridge. Starting today, river
forecasts and flood warnings will now be based on the Jordan Road Bridge
stream gauge. These gauges can be seen on our AHPS website at: 
https://water.weather.gov/ahps2/index.php?wfo=sew

South Fork Stillaguamish River at Jordan Road Bridge: Flood warnings for
this site are for the river valley including Jordan Road and the
Robe Valley, Granite Falls, and Blue Spruce areas. These are the 
NWS flood levels for this new location:

Flood Stage/Minor Flood:  14.5 feet
Moderate Flood:           16.0 feet
Major Flood:              17.0 Feet

The reason for change in the forecast point on the South Fork
Stillaguamish River stems from the lack of the ability to make
accurate stream measurements at the Granite Falls gauge location,
which relates the gauge height reading to the flow of water.

If you would like more information about the National Weather
Service hydrologic services in the Seattle area, please contact
Brent Bower, Senior Service Hydrologist, at 206-526-6095.