An invasion of quagga and zebra mussels is being held off at the borders of Northwest states through the efforts of invasive species inspection stations, but the U.S. Army Corps of Engineers’ Walla Walla District is preparing for the worst.
An invasion of quagga and zebra mussels is being held off at the borders of Northwest states through the efforts of invasive species inspection stations, but the U.S. Army Corps of Engineers’ Walla Walla District is preparing for the worst.