Cedar River (WA) near Landsburg, WA
River level and flood forecast · King County
The river is 4.4 ft below flood stage (5.7 ft).
Forecast to hold near 1.3 ft through Mon, Oct 19, 11 PM.
Flow: 368 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 8:24 AM. Forecasts change as rain falls and as upstream water arrives.
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An email when the National Weather Service forecasts Cedar River (WA) near Landsburg to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 7.5 ft |
| Moderate flood stage | 6.5 ft |
| Flood stage | 5.7 ft |
| Action stage | 3.5 ft |
| Record crest (December 29, 1917) | 13.55 ft |
What floods at each level
From the National Weather Service, highest first.
- 7.5 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.
- 6.5 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.
- 5.7 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.
- 5 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.
- 4.4 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.
Highest crests on record
- 13.55 ft — December 29, 1917
- 10.95 ft — January 13, 1928
- 10.38 ft — November 24, 1990
- 10.3 ft — January 10, 1923
- 10.17 ft — December 11, 2025
Recent crests: 10.17 ft (December 11, 2025) · 8.23 ft (February 8, 2020) · 4.08 ft (January 5, 2015) · 4.61 ft (March 10, 2014) · 3.25 ft (April 20, 2013)
Up and down the river, and nearby
- DownstreamCedar River (WA) at Renton, WA
- Issaquah Creek near Hobart, WA
- Green River (WA) at Purification Plant, WA
- Newaukum Creek near Black Diamond, WA
- Green River (WA) below Howard Hanson Dam, WA
- Cedar River (WA) at Chester Morse Lk at Cedar Falls, WA
- Big Soos Creek near Auburn, WA
- Snoqualmie River at Snoqualmie Falls, WA
- Issaquah Creek near Issaquah, WA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (LNDW1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.