Seattle District Header Image


Home > Missions > Civil Works > Locks and Dams > Howard Hanson Dam > Green River Flood Risk Maps

Green River Valley Flood Risk Maps

The maps on this Web page show four potential scenarios, based on flows in the Green River as measured at Auburn. These scenario maps are intended to provide the public with an idea of the range of flooding that could occur. However, the scenarios cannot consider every uncertainty associated with an actual flood event.

In short, these are not the only scenarios possible, but allow for planning degrees of response. The maps do not take into consideration work being done along the river in regards to levee fortification and again may not accurately reflect inundation. The maps are meant to inform the public of potential risks, but do not display all the hazards associated with flooding such as loss of electricity, closed transportation routes, etc. The public should communicate with their city and/or county to understand the potential impacts, responses, and methods of warning notification and communication.