Clearwater Lake AssociationDeerwood MN

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  • Home
    • What's New on the Web Page
  • Lake Association
    • Overview >
      • Clearwater Lake Association
      • Mission Statement
      • The Legal Paperwork
    • Meetings >
      • 2022 Meetings
      • Past Meetings
    • Membership Communication
    • Membership Dues
    • Meet the Board
    • Recent and Upcoming Events
    • Crayfish Campaign >
      • Trapping
      • Storing
      • Cooking
      • Eating
    • Volunteer Opportunities
  • Lake Health
    • Overview >
      • Lake Health Overview
      • Lake Managment Plan
      • What Can I Do
      • 2018 / 2021 Aquatic Vegetation Survey
      • DNR and Milfoil Treatment
    • Reports and Maps >
      • Lake Reports
      • Lake Maps
      • Aquatic Management Area
    • Trophic State Index
    • Water Level >
      • Water Level Management
      • HIgh Water Report
      • High Water Damage
      • Ice Heaves
    • Invasive Species >
      • What are Invasive Species
      • Eurasian MilFoil
      • Curly-Leaf Pondweed
      • Rusty Crayfish
      • Buckthorn
      • Invasive Treatment >
        • Treatment Plans
        • Invasive Maps
    • Loons >
      • Clearwater Loons
      • Nesting Project
      • Loon History
      • Why Clearwater Loons Are Important
      • Loon Cam 2017
    • Community Mini-Grant >
      • Lake shore Mini Grant
      • Seminar Flier
      • News Release
      • Grant Gallery
      • Willow Wattle - DIY >
        • Willow Wattle Supplies
        • Willow Wattle Prep
        • Willow Wattle Install
    • Historical Data
    • DNR and Other Resources
  • Community
    • Membership List
    • Photo Gallery
    • Lake History - From our Members
    • Clearwater Forsest Camp >
      • Dining Hall Images
    • Log In Information
  • Contact Us

Ice Heaves

  • Lake Health
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    Find out the causes and  what we are doing about it.
    • Water Level Management
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    • High Water Damage
    • Ice Heaves
  • Invasive Species
    Clearwater has 4 invasive species.
  • Lake shore Run off Mini Grant 
  • Our Loons
  • Historical Data
    See what people have been tracking!
  • DNR / Other Resources
    There is all kinds of GREAT information out there. 

The Tremendous Power of Lake Ice

Posted 3/31/2017 by Jeff Zernov
Ice is a marvelous form of our most precious resource. We depend on it for winter fun, and our lakes depend on it for their natural seasonal cycles. Despite the joy we get from frozen lakes in the winter, the ice can also wreak havoc on lakeshore by pushing up the sand and soil into large ridges.

Today I will talk about the tremendous power of lake ice, and the phenomenon called “ice heaving” or “ice-jacking”. There are some positives and some negatives to this phenomenon, depending on your perspective. It can be extremely damaging to personal property on the lakeshore, but it can also be beneficial to the lake’s health and its ecosystem.

First of all, why do these ice ridges form? Ice is not stagnant in the winter once it forms. It is continually changing, expanding and contracting as the temperatures rise and fall. When the temperature drops the lake ice contracts, producing cracks which refill with more water and freeze. Then, when t he temperature rises the ice expands, but there is no where for the ice to go in the lake so it pushes up against the shore. As ice continues to expand and contract throughout the winter, it produces a ratcheting effect. Each subsequent and cumulative push exerts tremendous pressure upon the shore.

For example, for a lake that is one mile across, when the ice’s temperature rises from 14 to 32 degrees Fahrenheit, the ice sheet will expand laterally a total of approximately 32 inches, almost 3 feet! This can occur in a matter of hours when there is no snow cover on the ice sheet.

Ice jacking is more severe in years where the temperatures fluctuate greatly and where there is little snow cover to insulate the ice and keep the ice temperature constant. This year, we have had a relatively thick snow cover all winter, so in theory, the ice heaving should be less dramatic.

There really isn’t much you can do on shore to keep the ice at bay. The ice so powerful that it is impractical, from an economic standpoint, for the average individual to construct retaining walls or a foundation of sufficient strength to resist it. Rip-rap is of little value unless laid on a properly placed gravel foundation and on an extremely flat slope.

The safest course for lakeshore property owners is to follow setbacks and be sure that the buildings are located as high above the lake level, and as far removed from the shore as practical. Setback regulations of 100 feet from the shoreline are not only important for aesthetics and to prevent runoff into the lake in the summer, they also protect lakeshore property owners in the winter from ice damage. There have been years where ice can rip cabins near shore off their foundations.
What can property owners do in the spring when they’re left with large ridges of sand and soil? Usually, a DNR Public Waters Work Permit is required for altering shoreline below the ordinary high-water level. There are some conditions where you can grade and remove an ice ridge without a permit. Check with the DNR to be sure: 1-888-646-6367 or http://www.dnr.state.mn.us/permits/water/needpermit.html.

So what are the benefits to ice heaves and ice jacking? Ice heaving has been a natural process occurring on Minnesota lakes for thousands of years. The ridges form a natural barrier to runoff and traps nutrients from flowing into the lake. These nutrients then become fertilizer to plants that grow to form a buffer on the lakeshore. The shade and habitat offered by near-shore plants benefit organisms along the shore and in the lake, thus supporting nesting and spawning fish. If you have undeveloped natural shoreline, leave the ice ridges in place and watch in future years how they develop into great habitat.

Winter in Minnesota comes with its pluses and minuses, but for most of us that spend the winters here, the positives of winter fun on the lake ice out weigh the negatives of the ice’s power. To learn more about lake ice visit http://www.dnr.state.mn.us/waters/watermgmt_section/pwpermits/ice_ridges.html
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2017, Photo by Jeff Zernov
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2017, Photo by Jeff Zernov
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2017, Photo by Paula Zernov
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Turn In Poachers

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Clearwater Forest Camp

Since 1954, Clearwater Forest has served as a retreat center and summer camp.  They are owned and managed by Presbyterian Clearwater Forest, Inc.  Clearwater Forest is an important resident on our lake.  With 4+ miles of lake shore and over 1000 acres around  Clearwater, everyone benefits from their mission statement "... be a faithful steward of God’s creation."

To lean more, go to clearwaterforest.org.
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