I finally was able to get out ice fishing last week in the St. Louis River harbor in Duluth. It's a pretty good walleye spot, and they've been biting pretty well off Park Point. This has been a really mild winter, and ice conditions have been sketchy at best.

Last Wednesday I went out with a friend and we tested the ice. We did have almost a foot of ice, but it was ice that had frozen, melted, and frozen, making it weak. We did notice these strange-looking holes everywhere.

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I don't remember ever seeing anything like it, so I looked it up online, figuring there had to be an explanation. These holes had refrozen, but it makes you feel a little uneasy walking on them.

Ken Hayes
Ken Hayes

Rainy Winter Can Cause It

There are a few explanations for how this can happen. For this instance, the most likely situation was how it froze, melted, rained, and then froze again. The ice melted enough to create a hole, then the rain on top of it caused it to spread out like a spider web and then it froze over again. Or, it could be some other weird stuff happening.

Related: Hidden Dangers Of Shelf Ice In Minnesota + Wisconsin

Warmer Water Rising Up

In some cases, warmer water could come up to the surface and that could lead to these shapes forming.

Ken Hayes
Ken Hayes

Decaying Vegetation?

Another thing could be decaying weeds or gas bubbles rising to the surface. It does happen. Last year a giant one formed on a Lake in Minnesota from this.

These 50 US Cities are Crawling with Bed Bugs

Every year the pest control gurus at Orkin put together a list of the Top 50 Bed Bug Destinations in the United States. Which areas do you travel to that you should take extra care to watch out for these blood-sucking insects? Let's countdown to the most bed-bug-riddled city in the United States.

Gallery Credit: Scott Clow

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