Skip to main content
background image
King County logo
Skip to main content
  1. Environment
  2. Flood services
  3. Flood warnings and alerts

Cedar River Flooding Information

USGS gage data, map, alert phases, and recent high flows

« List of rivers
» King County Flood Alerts

flood app icon
Flood Warning Mobile App Try our award-winning app for Android & iOS

New: Click on a gage name for graph and additional data.

USGS Gage Name

Time, Date

Stage
(feet)

Flow
(cfs)

Flow Change
(cfs/hr)

Cedar River near Landsburg 10:45 AM, 10/4/2023 1.21 307 0
Cedar River at Renton 10:15 AM, 10/4/2023 8.03 282 0

* Gage data currently unavailable.

Notes:

This data was requested from USGS at 10/4/2023 12:05:05 PM.

cfs = 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
Flood Phase Information
Phase Flow at Cedar River gage near Landsburg Description Condition
1 1,800 cfs Internal Alert  
2 2,800 cfs Minor Flooding Jones Rd near 156th Place SE may overtop and close.
3 4,200 cfs Moderate Flooding Lower Dorre Don Way and Byers Rd SE may overtop and close. These roads provide access to several neighborhoods where residents may become trapped and require evacuation.
4 5,000 cfs Severe Flooding Additional roads may overtop and close including: Cedar Grove Rd SE, Maxwell Rd SE and SR-169 near the intersection with Cedar Grove Rd SE. Dead end streets may overtop and close including: Jan Rd SE (SE 197th St), SE 203rd St, SE 206th St, and SE 207th St. Fast and deep flows can create dangerous conditions throughout the floodplain.
Cedar River gage map - flooding
Recent High Flow Data
High Flow Event Cedar River near Landsburg Cedar River near Renton
February 7, 2020 7,590 cfs 8,890 cfs
January 17-18, 2011 4,710 cfs 5,870 cfs
January 8, 2009 7,870 cfs 9,390 cfs
November 7, 2006 4,670 cfs 6,090 cfs
February, 1996 5,860 cfs 7,520 cfs
November, 1995 6,580 cfs 7,650 cfs
November, 1990 10,800 cfs 10,600 cfs

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

Cedar River near Landsburg (external link)

Cedar River at Renton (external link)

More Cedar River Flood Documentation

NEW: Cedar River flood level viewer

Flood Photo Viewer

Other Flood-related Information

» Return to the The Flood Warning System Page
» Visit King County Flooding Services
» See other Cedar River Topics