Thousands of mayflies pile 6 inches high and block traffic in Havana, Illinois

Thousands of mayflies have taken over a bridge in Havana, central Illinois on June 27, 2016.

At one point the mound of insects piled 6 inches high.

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Havana Police Department

The Havana Police Department warned drivers of a massive mayfly swarm on its Facebook page Monday morning, posting two photos that showed the bridge over the Illinois River and a local squad car blanketed by the bugs.

Newly winged mayflies will emerge from the waters where they live until adulthood in droves when triggered by the right temperature.

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Havana Police Department

The insects then die within a few days.

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Havana Police Department

The City of Havana Street Department and IDOT are working to get the mayflies under control.

Insane mayfly invasion.

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