A2 mussels, zebra, left and quagga.jpg

Zebra, left, and quagga mussels, right, are small but powerful invaders.

During the week of May 20, a group of 15 participants converged on the Snake River in Hells Canyon for a planning exercise in the event the Columbia River Basin tests positive for quagga or zebra mussels.

The group practiced activating a mock command center and conducted a scenario-based, on-water drill. From this exercise, the group determined what actions and their priority, in the event quagga or zebra mussels are detected in the Columbia or Snake Rivers, said a press release.