WALLA WALLA, Wash. – Four U.S. Army Corps of Engineers Walla Walla District dams in Idaho and Washington state, plus the McNary Levee System in southeast Washington, have been reclassified by the Corps as safer “Low Risk” dams and dam-related levees within the Corps’ nationwide Dam Safety Action Classification (DSAC) system. The Corps operates more than 700 dam nationwide and has an ongoing and aggressive Dam Safety Program to reduce public risk and environmental damage.