High winds down the Hayden Lake Watershed whipped up the waters of the lake on May 18th. This was the day Clean Lakes had scheduled to implement ISDA’s spring treatment of Curly-Leaf Pondweed in the North Arm. Knowing that such weather would churn the water, drive the Galleon SC into untargeted sections of the lake-bottom, and degrade the herbicide concentration in the weediest areas, ISDA postponed treatment. But only for a day. Clean Lakes applied Galleon SC per the plan outlined on ISDA’s Treatment Map on May 19. The North Arm of Hayden Lake is now under the following water-use restrictions:
- Drinking-Water – There are NO RESTRICTIONS on the consumption of treated water for potable use or by livestock, pets, or other animals.
- Recreation – There are NO RESTRICTIONS for swimming or fishing in the treated areas.
- Turf irrigation – there are NO RESTRICTIONS for irrigating turf/lawns.
- Non-food ornamental and broadleaved plants – DO NOT IRRIGATE ornamentals until the residue test results show levels less than five (5) parts per billion (ppb).
- Food Crops – DO NOT IRRIGATE edible plants until test results show levels less than one (1) ppb.
ISDA will test the herbicide concentration in the water on Monday, 5/24. They will then issue a notice regarding the release or continuation of water use restrictions.
Learn more about ISDA’s weed treatment plans in 2021 from our report on the Annual Spring Community (Weed) Meeting.
Tap into ISDA’s Annual Aquatic Treatment Plans page for information regarding weed surveys and weed treatment on Hayden Lake.
Visit Clear Lakes’ Hayden Lake page for the most immediate information on treatment, water-use restrictions, and water testing results.
