Hayden Lake Invasive Species Survey: Why Your Water Rights Contact Information Matters
Did you notice Idaho State Department of Agriculture’s Invasive Species boat out on Hayden Lake
July 3, 2026
’25 Invader Outlook: You’re Invited to the Community Meeting
Join the Hayden Lake Watershed Improvement District for important presentations from the Idaho State Department of Agriculture (ISDA) and Kootenai County (KC). Learn about invasive and noxious species that threaten our Hayden Lake Watershed. Don’t miss this chance to stay informed!
May 15, 2025
2024 Hayden Lake Invasive and Noxious Weed Updates
The Idaho State Department of Agriculture (ISDA) has shared early summer updates about this season’s testing and treatment of invasive and noxious aquatic weeds on Hayden Lake:
June 19, 2024
Water Rights and ’23 Weed Treatment
ISDA’s weed surveys are complete, and they have found Eurasian Watermilfoil in Hayden Lake again this year.
June 26, 2023
Second ISDA Weed Treatment of 2021
Hayden Lake has been central in the Idaho State Department of Agriculture (ISD) sites in recent weeks. Since July is the month for invasive Eurasian Watermilfoil / Hybrid Watermilfoil (EWM) to reach its nuisance stage, ISDA has worked diligently to identify infestations and treat them responsibly.
July 22, 2021
ISDA Planning Invasive Milfoil Treatment for North Arm
The Idaho State Department of Agriculture (ISDA) is charged with managing invasive aquatic plants across Idaho. Current invaders in Hayden Lake include Curlyleaf Pondweed and Eurasian and Hybrid Milfoil. ISDA makes every effort to target these invasive weeds with the least impact on native plants or the natural ecosystem. We are grateful for their investment in Hayden Lake and their service to the Lake and its residents.
June 29, 2021
May 2021 Weed Treatment in the North Arm
High winds down the Hayden Lake Watershed whipped up the waters of the lake on
May 20, 2021
Managing Native Aquatic Plants – Part 2 of the Annual Spring Community Meeting
On April 13, the HLWID hosted the 2021 Annual Spring Community Meeting: Weeds and More. This second in a series of three posts summarizes Dr. Kim Holzer/ISDA’s presentation on managing native aquatic plants for invasive weed suppression. (Part 1: 2021 Weed Treatment Plans; Part 3: KCSO on Hayden Lake)
May 5, 2021
Herbicide and Diver Treatments set for Aug 20-25
Idaho State Department of Agriculture will treat designated areas of Hayden Lake for Eurasian Watermilfoil (EWM) during the week of August 20-25, depending upon weather conditions.
August 8, 2020
Main Lake Weed Update
It seems unfair, giving all the attention to the North Arm of the lake. The Main Body of the lake is not without its weed concerns too.
August 7, 2020
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