Hayden Lake Watershed Improvement District

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Idaho Water Quality Standards & Hayden Lake

Idaho’s Water Quality Standards which are relevant to Hayden Lake’s impairment are deceptively simple: the lake will be free of certain materials and substances that may impair beneficial uses. The criteria in question include temperature, turbidity, bacteria, dissolved oxygen, nutrients, sediments, and known toxic substances.

Hayden Lake is the home of cold-water-adapted aquatic life and salmonid spawning. It is a vital source of drinking water. And, it is a primary source for public recreation. These are the beneficial uses for which the state protects the lake.

What does Phosphorus-Limited mean?

The earliest studies of the lake found that plant growth is phosphorus-limited. That is to say, plant growth uses up the phosphorus in the water before it uses up the nitrogen.  The phosphorus concentration keeps plant growth in check. And, adding a little phosphorus can lead to a lot of extra plant growth.

“Anyone who has thrown a backyard barbecue knows that hot dogs are inexplicably packaged in different numbers than buns — eight hot dogs per pack versus ten hot dog buns. Put in ecological terms, this means that weenie roasts are “hot-dog limited” — the extra buns are worthless without hot dogs to fill them.”

“At The Root Of Nutrient Limitation, Ecosystems Are Not As Different As They Seem.” ScienceDaily.

Hayden Lake meets all criteria for preserving its beneficial uses, except for nutrients. The lake’s phosphorus concentration was (and continues to be) increasing. This upward trend feeds a chain reaction that eventually damages all of Hayden Lake’s beneficial uses.  By designating Hayden Lake as impaired, IDEQ set in motion a different chain reaction; one that brings public and governmental support to halting the trend in phosphorus concentration and maintaining the high quality of Hayden Lake’s water.

The TMDL (Total Daily Maximum Load) is the next link in the chain.

Read More About the Water Quality of Hayden Lake:

  • Hayden Lake Water Quality
  • Idaho Water Quality Standards & Hayden Lake
  • The Eutrophication of Hayden Lake
  • What is TMDL?
  • Phosphorus Loading Via South Shore Runoff
  • Nutrient Profile of the North Arm

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More on Water Quality from our BLOG:

Quagga mussels can attach to both soft and hard surfaces.

Quagga Mussels NOT in Hayden Lake – Yet

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Eurasian Watermilfoil was found via survey spring '23 in Hayden Lake along the south eastern shore.

Water Rights and ’23 Weed Treatment

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Winter weather causes debris to pile up on shores.

Lake Debris Removal: Request for Bids

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Residents tie a debris raft to their boat for hauling to the staging site.

Tips for Lake Debris Removal

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News From the 'Shed

Quagga Mussels NOT in Hayden Lake – Yet

Water Rights and ’23 Weed Treatment

Lake Debris Removal: Request for Bids

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  • Living on Hayden Lake
    • Rights, Permits, Questions, Concerns: Who to Contact
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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.