The state Department of General Administration, which manages the 260-acre lake, has closed all three boat-launch areas.
Measuring an eighth of an inch, New Zealand mudsnails also have been detected in freshwater canals on the Long Beach Peninsula and in the lower portion of the Columbia River. They can live in either fresh or brackish water and can reproduce asexually, said Allen Pleus, state Department of Fish and Wildlife aquatic invasive species coordinator.
