Levee systems protecting Dayton and Walla Walla received overall ratings of "minimally acceptable" after recent inspections by the U.S. Army Corps of Engineers.
The minimally-acceptable rating means the levees remain eligible to apply for federal rehabilitation assistance if damaged in a flood or storm event, said Herb Bessey, levee safety program manager with the Corps' Walla Walla District office.
The Dayton levee system consists of segments along the Touchet River that were built in 1965. The right bank system begins about a half-mile upstream from the city and extends to the confluence of Patit Creek with the Touchet River. The left bank portion begins about a half-mile upstream of the U.S. Highway 12 bridge in Dayton and extends to the wastewater treatment plant.
The system is jointly operated by the city and Columbia County.
The Mill Creek levee extension project is east of Walla Walla and protects a portion of the city, Walla Walla Community College and residential property. The project was built in 2002 and consists of a right bank setback levee embankment approximately 1,787 feet long near Mill Creek.