Invasive Species

News Release

Eurasian watermilfoil treated in West Okoboji Lake canal

Iowa Department DNR recently discovered and treated a small, isolated population of Eurasian watermilfoil growing in the canal system south of Miller’s Bay.

July 29, 2026

Invasive Species

News Release

Aggressive treatment planned for Eurasian watermilfoil found in Clear Lake

The Iowa Department of Natural Resources (DNR) treated Clear Lake last week with the approved aquatic herbicide, Sonar A.S. to eliminate Eurasian watermilfoil.

November 12, 2025