WATERWAYS -- Inconclusive test results showing signs of invasive mussels in Flathead Lake still have downstream interests on edge.

"Part of me still stands strong and thinking positive that it's going to be OK," said Erin Mader of the Pend Oreille Basin Commission in Sandpoint.

Results from a second round of tests to verify whether invasive quagga and zebra mussels have taken root in Flathead Lake could be revealed next week, according to officials from Montana Fish, Wildlife and Parks.

"I'm optimistic because a similar thing resulted from initial tests on the Snake River last year and they later were deemed negative," Mader said.