Hayden lake

Photo by Kim Holzer, ISDA

Photo by Kim Holzer, ISDA

Eurasian watermilfoil Treatments

Hayden Lake EWM Treatments Map
-Treatment 1 occurred July 25
-Treatment 2 occurred July 26
-Treatment 3 to occur August 16* (Cancelled**)

Henry Point Treatment - Occurred on July 10

O'Rourke Bay Treatment - Occurred on July 10

Mokins Bay Treatment - Occurred on July 9


Hayden Lake Post Treatment Water Sampling
-This sampling is the three day post treatment sampling required by the National Pollutant Discharge Elimination System (NPDES). All areas are clear with the exception of the Rollins Bay sample point where follow up sampling results will be available Thursday August 2.

Herbicide to be used: Littora 

*A notice from the contractor will be delivered to residents in the area notifying them of any water restrictions and treatment plans for treatment #3 of Hayden Lake.

**TREATMENT CANCELLATION NOTICE – HAYDEN LAKE: Treatments on Eurasian watermilfoil (EWM) scheduled for Thursday, August 16th, have been cancelled. Pre-treatment surveys indicated that treatments conducted on July 25th effectively managed EWM populations in all target locations.  Restrictions on drinking and irrigation water are no longer in effect for this area.

For questions or concerns, please contact the Idaho State Department of Agriculture's Noxious Weeds Program at (208)332-8667.