NOTICE OF 2020 HAYDEN LAKE
CURLY-LEAF PONDWEED TREATMENT
April 25, 2020
Dear property owners and lake users,
Curly-leaf pondweed has been identified as a significant invasive species within Hayden Lake, Idaho and is known to negatively affect the beneficial uses of a waterbody. As such, an aquatic herbicide treatment is planned for a portion of northern Hayden Lake the week of May 18, 2020, based on water temperature, plant growth and weather permitting. The treatment timing was selected to maximize treatment efficacy when Curly-leaf pondweed is actively growing. Approximately 297 acres of the lake will be treated during one treatment event with liquid penoxsulam (Galleon©, EPA Registration # 67690-47). Please see the following website for information on the penoxsulam herbicide.
https://dnr.wi.gov/lakes/plants/factsheets/PenoxsulamFactsheet.pdf
Water use restrictions will be in effect due to the presence of irrigation water intakes in areas of the lake. Water use restrictions will be established to 0.25 mile away of the treatment areas. The following water use restrictions apply:
- Irrigation Use of Water: Do not irrigate established food crops until water use restrictions are lifted. Do not irrigate other non-food crops, such as landscape ornamentals, until water use restrictions are lifted. There is no restriction for irrigation of turf.
- Recreational Use of Water in Treatment Area: There are no swimming or fishing restrictions within the treatment areas.
- Potable Water in Treatment Area: There are no restrictions on consumption of treated water for potable use or by livestock, pets or other animals.
For up to date information on water use restrictions and treatment date please visit the applicator’s website.
http://www.cleanlake.com/2020haydenlake1.html
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 (208-993-0950), with any questions.
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