Hayden Lake Watershed Improvement District

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  • The District
    • HLWID – District Matters
      • Improvement District vs. Association – What’s the Difference?
      • Privacy Policy
    • Board of Directors
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    • Communication and Public Outreach
    • Monthly Meetings
  • The Watershed
    • Blue-Green Algae
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      • Improvement District vs. Association – What’s the Difference?
    • Living on Hayden Lake
      • Rights, Permits, etc.: Who to Contact
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      • Curly-Leaf Pondweed
      • Eurasian Watermilfoil
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      • Lake Water Quality Studies
      • Hayden Lake Water Quality
      • Idaho Water Quality Standards & Hayden Lake
      • The Eutrophication of Hayden Lake
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      • Honey Badger Project
      • English Point – a Cherished Resource
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News from the 'Shed

the most important NEWS of the day in the HAYDEN LAKE WATERSHED

Apply for a ’25 Lake Debris Removal Program Permit

Stakeholder Engagement Thought Experiment

Communication Signup

Invasive and noxious aquatic plants become entangled in boat motors, anchors, and other equipment. This is part of the nuisance aspect of invasive species.

’25 Invader Outlook: You’re Invited to the Community Meeting

Winter weather causes debris to pile up on shores.

’25 Lake Debris Removal Program – Keeping Hayden Lake Safe and Clean

This is blue-green algae or cyanobacteria on the surface of the water.

Cyanobacteria-HAB Advisory Continues – Watch Out!

  • Invasive & Noxious Weeds, Living on Hayden Lake
  • April 17, 2020
  • Invasive & Noxious Weeds, Living on Hayden Lake
  • April 17, 2020

Watch the 2020 Invasive Aquatic Weeds Meeting Video

On April 7, residents around Hayden Lake met with Idaho State Department of Agriculture for the third annual Invasive Aquatic Weeds Information Meeting. Jeremey Varley, ISDA Noxious Weed Manager, shared follow-up information on the 2019 weed treatment and plans for 2020 treatment.

Presentation Highlights:

A Quick Review of 2019

  • In the spring of 2019, Aquatechnex applied SonarOne (Fluridone) throughout the North Arm to combat Curlyleaf Pondweed and Eurasian Watermilfoil.
  • In the summer, ISDA applied Procellacor (Florpyrauxifen-Benzyl). This treatment targeted Eurasian Watermilfoil growth around the shoreline of the southern portion of the lake.
  • ISDA conducted a Turion Assessment in Oct ’19. They sampled and counted the number of viable vs. non-viable turions at ~30 sites. The greatest number of viable turions came from the Sportsman’s Access area. This work sets up a baseline estimate of the extent of the Curlyleaf in the North Arm. It provides a point of comparison for future sampling, to be used as evidence of the success of herbicide treatments going forward.

Spring Treatment 2020

  • Spring treatment will be in the North Arm only, targeting Curlyleaf Pondweed and killing any Eurasian Water Milfoil growing at the time of application.
  • The treatment date targets the point at which germination is complete, and before turion development begins. Based on 2019’s weather, the application should take place the week of May 18. Stay tuned, as our mild spring could push that date out.
  • ISDA will use Galeon (Penoxsulam) Herbicide. This herbicide has no drinking water or recreational restrictions. Irrigation restrictions include no irrigation of food crops or ornamental landscapes until the herbicide concentration is below 1 ppb; no turf watering unless levels are below 30 ppb. The application rate will be 10 ppb.
  • ISDA will test for post-treatment residue 2, 14, and 28 days after treatment to monitor herbicide concentration.

2020 Survey Plans

  • ISDA conducted a spring survey for Curlyleaf in the North Arm in March.
  • An early summer survey of the littoral zone throughout the lake will assess Milfoil growth.

Summer Treatment 2020

  • Procellacor treatments will take place after July 4, in the southern portions of the lake, if early summer survey results find Milfoil growth. If not, there will be no summer treatment.
  • The North Arm will not be re-treated.

2020 Survey Plans cont.

  • The 2019 Procellacor treatment areas will receive spring and late summer surveys to assess the impacts of treatment.
  • Another Turion Assessment will take place in the fall in the North Arm to predict the long-term effect of the 2020 Galeon treatment.

The Invasive Aquatic Weeds Meeting concluded after an extensive Q&A period. Download the 2020 WeedTreatment-QA document for answers to questions from this session, as well as those submitted by participants before the meeting.

Watch the ISDA Annual Aquatic Treatment Plans web page for up-to-date plan details.

References - find more on the web:
PrevPreviousThe Buoy Project: Request for Installation Bids
Next2020 Dock and Debris Removal Sponsored by the Improvement DistrictNext
Invasive and noxious aquatic plants become entangled in boat motors, anchors, and other equipment. This is part of the nuisance aspect of invasive species.

’25 Invader Outlook: You’re Invited to the Community Meeting

Winter weather causes debris to pile up on shores.

’25 Lake Debris Removal Program – Keeping Hayden Lake Safe and Clean

This is blue-green algae or cyanobacteria on the surface of the water.

Cyanobacteria-HAB Advisory Continues – Watch Out!

Apply for a ’25 Lake Debris Removal Program Permit

Stakeholder Engagement Thought Experiment

Communication Signup

Apply for a ’25 Lake Debris Removal Program Permit

Stakeholder Engagement Thought Experiment

Communication Signup

  • Related Content: Invasive & Noxious Weeds, Living on Hayden Lake
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About HLWID

The mission of the Hayden Lake Watershed Improvement District is to protect and enhance the water quality and the environmental quality within the watershed.

News from the 'Shed

Recent Posts
  • ’25 Invader Outlook: You’re Invited to the Community Meeting
  • ’25 Lake Debris Removal Program – Keeping Hayden Lake Safe and Clean
  • New Buoys Mark North End Research Sites
  • Hayden Creek Area Closed to Shooting Oct. 21-27 ’24
  • Cyanobacteria-HAB Advisory Continues – Watch Out!

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Home

News From the 'Shed

’25 Invader Outlook: You’re Invited to the Community Meeting

’25 Lake Debris Removal Program – Keeping Hayden Lake Safe and Clean

New Buoys Mark North End Research Sites

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The District

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  • About the HLWID
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  • Board of Directors
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The Watershed

  • Blue-Green Algae
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  • Living on Hayden Lake
    • Rights, Permits, Questions, Concerns: Who to Contact
      • Invasive & Noxious Weeds
  • Recreation
  • The Watershed
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Monday 4/16, 7:00 p.m.

HLWID Monthly Meeting

HLWID's Monthly Meetings will move to teleconferencing in order to ensure the health and safety of our constituents. For 4/16's meeting, dial 641-715-0861 and enter code 398963# at the prompt. This is a public meeting; all are welcome.