Zebra Mussel Eradication Plan for Smishek Lake

The North Dakota Game and Fish Department, in cooperation with state and federal partners and local stakeholders, have finalized a plan to eradicate zebra mussels from Smishek Lake.

“This decision was not an easy one, but we feel this plan is absolutely necessary to protect the downstream waters of Lake Sakakawea and lakes in northwestern North Dakota from zebra mussels,” said Ben Holen, aquatic nuisance species coordinator. “Generally, eradication is not a feasible option, but in this case, we believe we have a very good opportunity to eliminate zebra mussels from Smishek Lake.”

During the week of Oct. 13, Game and Fish Department staff will apply an EPA-registered copper-based molluscicide called EarthTecQZ. This product, when applied safely, will cause mussel mortality while sustaining other aquatic life. After the treatment, Game and Fish, and Department of Environmental Quality personnel, will monitor copper concentrations in Smishek Lake. In late fall or early winter, Game and Fish will also consider dewatering some of Smishek Lake and, if needed, pursue a secondary treatment with EarthTecQZ in spring 2026. 

The ramp will be closed on the day of treatment (Oct. 13-17) and signs will be placed around the lake.