skip to main content

Flooding Services

King County, Washington

Tolt River Flooding Information
USGS gage data, map, alert phases, and recent high flows

» Tolt River Basin Weather Stations
» King County Flood Alerts

flood app icon
Flood Warning Mobile App Try our new app for Android & iOS
mobile website

USGS Gage Name

Time, Date

Stage
(feet)

Flow
(c.f.s.)

Flow Change
(c.f.s./hr)

North Fork Tolt River near Carnation (external link) 5:15 AM, 4/21/2014 4.95 519 -8
South Fork Tolt River near Carnation (external link) 5:30 AM, 4/21/2014 2.35 142 -2
Tolt River near Carnation (external link) 5:15 AM, 4/21/2014 6.31 1030 -10

Notes:

This data was requested from USGS at 4/21/2014 6:12:14 AM.

The next request for USGS data is expected in approximately 7 minutes from when this page was loaded.

c.f.s. = cubic feet per second.
King County provides funding to the United States Geological Survey (USGS) to support the operation and maintenance of river and stream gages and related systems. The term "gage" is defined as an instrument for measuring or testing. USGS uses the term "streamgage" to describe their equipment that obtains estimates of the amount of water flowing in streams and rivers. More information about USGS streamgages

North Fork Tolt River near Carnation: Flow 519.00 c.f.s. at 5:15 AM (provisional)South Fork Tolt River near Carnation: Flow 142.00 c.f.s. at 5:30 AM (provisional)Tolt River near Carnation: Flow 1030.00 c.f.s. at 5:15 AM (provisional)Go to Snoqualmie River Flooding InformationGo to Skykomish River Flooding Information
Flood Phase Information
Phase Flow at Tolt River gage near Carnation Description Condition
1 2,500 c.f.s. Internal Alert  
2 3,500 c.f.s. Minor Flooding San Souci area homes may be inaccessible; 353rd Ave NE may experience high water depths and velocities where side channels cross the road. Levee on south bank between Snoqualmie Valley trail bridge and Highway 203 bridge near 323rd Pl SE may experience seepage.
3 5,000 c.f.s. Moderate Flooding Increased water depth and velocity over 353rd Ave NE in San Souci area; water across Tolt River Rd NE in vicinity of San Souci neighborhood. Increased seepage and potential backyard flooding at levee on south bank between Snoqualmie Valley trail bridge and Highway 203 bridge near 323rd Pl SE.
4 8,500 c.f.s. Major Flooding Levees may overtop near Carnation. Flow from seepage at levee on south bank between Snoqualmie Valley trail bridge and Highway 203 bridge near 323rd Pl SE may cross NE 32nd St. Channel changes may occur between upstream extent of Tolt River Rd NE/361st Ave NE and eastern boundary of Carnation.


Tolt River gages map
Recent High Flow Data:
Tolt River near Carnation
December 12, 2010 7,120 c.f.s.
January 8, 2009 13,800 c.f.s.
November 12, 2008 11,800 c.f.s.
November 6, 2006 10,500 c.f.s.
October, 2003 11,100 c.f.s.
December, 1999 11,800 c.f.s.
February, 1996 10,300 c.f.s.
November, 1995 11,400 c.f.s.
November, 1990 11,200 c.f.s.

The National Weather Service also provides access to provisional gage data:

Tolt River near Carnation (external link)

More Tolt River Flood Information

Flood Photo Viewer

Video of the Election Day Flood, November, 2006:

Photos of phase 4 flood, November, 2006
Lower Tolt River Floodplain Restoration Project
Snoqualmie River Flooding Information


» Return to the The Flood Warning System Page
» Visit King County Flooding Services