Cedar River (WA) near Landsburg

1. 7.50 ftthe Cedar River will cause severe flooding from Landsburg downstream through Maplewood. Deep and swift flood waters will inundate many roads and some residential areas, especially in Maple Valley. Flooding will occur all along the river including headwaters, tributaries, and other streams within and near the Cedar River Basin. A stage of 7.5 feet on the Cedar River corresponds to a phase 4 flood in the King County flood system.
2. 6.50 ftthe Cedar River will cause major flooding from Landsburg downstream through Maplewood. Deep and swift flood waters will inundate many roads and some residential areas, especially in Maple Valley. Flooding threatens SR-169. Flooding will occur all along the river including headwaters, tributaries, and other streams within and near the Cedar River Basin. A stage of 6.5 feet on the Cedar River corresponds to a phase 4 flood in the King County flood system.
3. 5.70 ftthe Cedar River will cause flooding from Landsburg downstream through Maplewood. Swift waters will flood roads and some residential areas, especially in Maple Valley. Flooding threatens Beyers Road. A stage of 5.7 feet on the Cedar River corresponds roughly to a phase 4 flood in the King County flood system.
4. 5.00 ftthe Cedar River will flood low areas from Landsburg downstream through Maplewood, mainly in Dorre Don area of Maple Valley and along Jones Rd. A stage of 5.0 feet on the Cedar River corresponds roughly to a phase 3 flood in the King County flood system.
5. 4.40 ftthe Cedar River will locally spill over its banks and over Jones Rd near 156th Ave SE. A stage of 4.4 feet on the Cedar River corresponds roughly to Phase 2 in the King County flood system.

Most recent crests

• December 11, 2025: 10.17 ft
• February 8, 2020: 8.23 ft
• January 5, 2015: 4.08 ft
• March 10, 2014: 4.61 ft
• April 20, 2013: 3.25 ft
• February 22, 2012: 3.88 ft
• January 25, 2011: 5.37 ft
• January 22, 2011: 5.17 ft
• January 17, 2011: 5.97 ft
• January 8, 2009: 8.44 ft

• DownstreamCedar River (WA) at Renton
• Issaquah Creek at Hobart
• Green River (WA) at Purification Plant
• Newaukum Creek at Black Diamond
• Green River (WA) at Howard Hanson Dam
• Cedar River (WA) at Chester Morse Lk at Cedar Falls
• Green River (WA) at Howard Hanson Reservoir
• Big Soos Creek at Auburn
• Snoqualmie River at Snoqualmie Falls

Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round. River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.