Douglas County Public Works will treat reemerging areas of Eurasian Water Milfoil in isolated areas of Lone Star Lake with an herbicide. The treatment with an herbicide called Navigate is scheduled for Thursday, August 6, weather permitting.

Due to the treatment, Lone Star Lake will be closed Thursday, August 6, to all water activities and signs will be posted. Public Works will reopen the lake on Friday, August 7.

Eurasian Water Milfoil is a non-native plant that threatens native aquatic plants and lake ecology. Richard Sanders, fisheries biologist, Kansas Department of Wildlife, Parks & Tourism, has recommended the treatment, and will accompany park maintenance personnel during the treatment.   

The Navigate herbicide is in granular form. It sinks quickly to the lake bottom. Restrictions for this herbicide include prohibiting swimming for 24 hours within 250 feet of treated areas after application. While the herbicide has no restrictions for watering livestock, park visitors and residents are encouraged to keep their pets out of the treated portions of the lake for 24 hours after treatment. Fishing or other restrictions are not needed following this herbicide treatment.