Ice Out!

MnStateParks tweeted this photo and said
“River’s up at Jay Cooke State Park. Expect it to continue rising through the week. Check back for updates.”

While going through their tweet stream I saw this post. – The ice is gone and the falls officially opened today at Gooseberry Falls State Park. What looks like snow is fo

The tweet was cut off, but what they are talking about is the foam you sometimes see on water.

It’s called foam tannins

The foam that appears along lakeshores is most often the result of the natural die-off of aquatic plants. Plants are
made up of organic material, including oils (i.e., corn oil and vegetable oil). When the plants die and decompose, the oils
contained in the plant cells are released and float to the surface. Once the oils reach the lake surface, wind and wave
action pushes them to the shore. The concentration of the oil changes the physical nature of the water, making foam
formation easier. The turbulence and wave action at the beach introduces air into the organically enriched water, which forms the bubbles.

We still have ice on most of our lakes, but if the temps stay constant it shouldn’t last long.

What other signs of spring have you noticed?


2 Comments so far

  1. birder (unregistered) on March 15th, 2010 @ 11:58 am

    The birds have been going bonkers and singing like mad every morning.

  2. David (jacc) on March 17th, 2010 @ 9:35 am

    @birder – A few weeks ago we noticed the cardinals started up their songs again, at 5am of course.

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