News from local media about Green River flooding risks...
Flood History Sites
Preparing for a Flood
This guide provides resources and information in three areas:
Green River Valley Flood Maps
Provided by the Army Corps of Engineers, the maps show five different scenarios. Please select from the following:
Flow rate of 13,900 cubic feet per second (cfs) map
Flow rate of 17,600 cubic feet per second (cfs) map
Flow rate of 19,500 cubic feet per second (cfs) map
Flow rate of 25,000 cubic feet per second (cfs) map
Flow rate of 25,000 cubic feet per second (cfs) map with a Levee Failure at 180th Street.
Note: All Army Corps of Engineers Maps are 11x17 in size. For more detailed maps or maps of the Middle Green River, please click here.
Specific City Flood Maps:
Flood maps are also available at many King County Library locations in South King County.
A Bit of History About the Howard Hanson Dam
Prior to the 1962 dedication of the Howard Hanson Dam, floods inundated the Green River Valley nearly every year. Local flood control initiatives in the 1920s and 30s proved unsuccessful and South King County residents petitioned the U.S. War Department (Army Corps of Engineers) to provide assistance. Fishing interests, a World War and a lack of finances all delayed initial construction. Howard A. Hanson, a Seattle attorney, civil engineer and civic leader finally succeeded in the campaign to secure funding for the dam project and in 1959 construction began in the Eagle Gorge area.
The dam construction included two side abutments – hillside anchors – and planners anticipated routine, modest abutment seepage. However, in January 2009, a record high level of water behind the dam revealed two depressions causing unusually high abutment seepage rates. Although the dam itself is not at risk of failing, water retention is compromised and until an anticipated 3-5 year permanent fix is completed, the dam’s retention capability will be compromised. Estimates, after a temporary grout fix, state that there is a 1 in 25 chance of flooding in the Green River Valley this season.
Green River Valley Map
Live feed of current Green River flow at the Auburn Gage. Image updates every five minutes
Click here for the latest Auburn Gage readings:
It’s time to plan, not panic (2006)
State Publications on Preparedness
Emergency resource guide (2007)
Small Business Resources
Children’s Books: Moving, Loss, Stress and Sadness
Twelve Terrible Things / Kelley
When I’m feeling sad / Moroney
Misery Moo / Willis
Homegrown House / Wong
Bandit / Rostoker-Gruber
My Friend The Monster / Taylor
Lucky Boy / Boase
Flood / Calhoun
The Goodbye Boat / Joslin
Big Ernie’s New Home / Martin