Lake Pend Oreille, Bonner County

Lake Pend OreilleLake Pend Oreille and the Pend Oreille River make up a lake system that contains 110,000 acres of water in Bonner County, Idaho. In 2005, an aquatic survey revealed Eurasian Watermilfoil in Lake Pend Oreille waters. This noxious weed has the potential to rapidly increase eutrophication of the lake system, impacting the value of the lake for water supply, boating, swimming, and fishing.

Bonner County Aquatic Invasive Species Task Force recommended a comprehensive program to control Eurasian Watermilfoil which includes diver dredging, bottom barrier placement, herbicide applications, and education and prevention efforts.

The Bonner County Weed Department, in cooperation with the Idaho Department of Lands and many other cooperating agencies, continued the control efforts begun with the treatment of 3,832 acres of Eurasian Watermilfoil in 2006, treating up to 1,870 acres of Eurasian Watermilfoil in 2007.

A third-party survey crew from Mississippi State University conducted surveys and extensively mapped the region in 2007 in support of ongoing monitoring and control efforts. **Final Report**

During the 2007 season, interested citizens were invited to attend and speak at public meetings, to visit the Milfoil Information Center in Sandpoint, ID, and to participate in the weekly boat tours of the treatment area. Interested persons are invited to contact Bonner County Public Works.





Photos of the Lake Pend Oreille Eurasian Watermilfoil Control Program

Milfoil in a boat propeller
Milfoil fouling a boat propeller

Milfoil clogging a waterway
Milfoil clogging a waterway
Milfoil Survey
Milfoil survey

Lake Pend Oreille - Bottleneck Bay
Bottleneck Bay, Lake Pend Oreille

Milfoil in the Clark Fork Driftyard
Milfoil in the Clark Fork Drift yard


Aquatic Species Found in Lake Pend Oreille


Invasive Species Watch List

Ponds, lakes and streams in this area may be at risk of invasion by the following aquatic or riparian weeds. If you think you have detected these or any other invasive weeds, contact the Bonner County Public Works, Noxious Weed Control at (208) 255-5681.