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The annual mayfly hatch has wreaked havoc with residents in Wisconsin along the Mississippi River, even possibly causing a three-car accident in Pierce County on Sunday night.
The annoying bugs only live for 48 hours, but they are just as much a problem dead as they are alive, experts say.
"They’re sometimes accumulating in areas that are lit up at night; so street signs, any of the power poles that have power lights on them, those are objects that these animals will be attracted to,” Harvey Halvorsen of the Wisconsin Department of Natural Resouces told WEAU. “Especially the bridges, if bridges have lighting, the Hexagenia adults will be attracted to the bridges.”
Wisconsin resident Glen Siewer says he has four wheelbarrows full of mayflies.
“The radar detected the flies about 845 pm, emanating from the river (the source) with echo values similar to that of light-moderate rain (35-40 dBZ),” NWS said. “With a general south-to-north wind flow above the surface, the mayflies quickly moved north once in the air. As the flies dispersed moving north-northeast, they also gained altitude with some of the echo being detected as far north as Black River Falls and as high as 2,500 feet above ground.”