"In the early 1990s, anglers in the Upper Columbia River reported seeing beads of liquid mercury floating in the water."

"The sightings were followed by advisories from the Washington Department of Health warning people to limit the fish they ate from the river.

The actions galvanized the Confederated Tribes of the Colville Reservation, whose 1.4-million-acre reservation borders the Columbia River."

Becky Kramer reports for the Spokane Spokesman-Review August 12, 2012. [2]