Aquatic herbicide application for Curly-leaf pondweed control will be carried out the week of August 1, 2022 in the area outlined below.
The aquatic herbicide application was completed
on Wednesday, August 3, 2022.
Water use restrictions are no longer in effect.
Please refer to treatment maps and water use restrictions below for additional information about these treatments.
NOTICE OF 2022 COEUR D'ALENE LAKE
CURLY-LEAF PONDWEED TREATMENT
July 21, 2022
Dear Property Owners and Lake Users,
Curly-leaf pondweed has been identified as a significant invasive species within Coeur d'Alene Lake, Idaho and is known to negatively affect the beneficial uses of a waterbody. As such, an aquatic herbicide treatment is planned for portions of northern Coeur d'Alene Lake the week of August 1, 2022, weather and water conditions permitting. The treatment timing was selected to maximize treatment efficacy when Curly-leaf Pondweed is actively growing. Less than 1 acre will be treated during one treatment event with liquid endothall (Aquathol K, USEPA Registration # 70506 -176) and liquid diquat (Littora, USEPA Registration # 67690-53). Please see the following link for information about the endothall and diquat aquatic herbicides.
Water use restrictions will be in effect for water intakes within the treatment area. The following information for water use restrictions is provided below:
Recreational Use of Water in the Treatment Area: There are no swimming or fishing restrictions within the treatment area.
Human Consumption: Potable water restriction in effect during and after treatment within and adjacent to the treated area for 3 days or until post treatment analysis confirms aquatic herbicides levels are below thresholds for drinking water. However, there are no known active potable water intakes that exist within or adjacent to the treatment area.
Animal Consumption: There are no known potable water intakes that exist within or adjacent to the treatment area for the supply of drinking water to livestock. There is no restriction to incidental exposure for pets that may drink water.
Irrigation: Irrigation restrictions will be in effect for irrigation to turf and landscape ornamentals during and 3 days after treatment or until post treatment analysis confirms diquat level is below 0.02 ppm. There are no irrigation restrictions for the use of endothall at this site.
Please contact Tom Moorhouse, Aquatic Pest Control Adviser with Clean Lakes, Inc., (208-929-2757) or Jeremey Varley, Section Manager - Noxious Weeds, Idaho State Department of Agriculture (208-332-8667), with any questions.
For information related to the aquatic herbicides Aquathol K® and Littora® that will be used, please go to the following link where the herbicide labels and Safety Data Sheets are available for review: