SLIDESHOW: Mayfly photos - WQOW TV: Eau Claire, WI NEWS18 News, Weather, and Sports

SLIDESHOW: Mayfly photos

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Photo taken in La Crosse by Tim Halbach/Holmen Photo taken in La Crosse by Tim Halbach/Holmen

LA CROSSE, Wis. (KTTC) -- Mayflies are creating mayhem in towns along the Mississippi River.

The photos in this slideshow show swarms of mayflies in La Crosse Sunday night. The mayflies covered street lights, buildings and stairs.

Although the swarms of flies were so big they could be seen on radar, their lifespan is only 30 minutes to a few hours.

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