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During the week of February 5th, the Blue Mountains in Oregon and Washington state received 3-6 inches of rain with some gauges reporting almost 10 inches. The deluge caused substantial flooding on the Walla Walla and Touchet Rivers that destroyed roads, homes, and other structures. The rainfall also caused landslide and other mass movements along the steep valley walls in the Walla Walla River Basin.
Our goal is to catalog the impacts of the rainfall and flooding. This analysis will help us to understand future risks associated with large flooding events in the Walla Walla Valley. We are collecting imagery from social media and tracking down geolocations of these photos. We are using satellite imagery to create a landslide inventory from the rainfall. The imagery is also used to analzye flood impacts to valley floors.
Peak discharge of the Walla Walla River below the confluence of Mill Creek as nearly 30,000 cfs
Flooding on the Mill Creek in the city of Walla Walla on February 7
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