A Mayfly Swarm So Big It Showed Up on MN Weather Radars! (VIDEO)
The swarm worked its way up the Mississippi and then went toward Hastings, where the town turned off their streetlights.
Mayfly
Minnesota Preparing for Mayfly Infestation
Back in 2017 the Mayfly situation was so bad it led to massive mounds littering the lock and dam in Welch, MN and even a three-car accident near Red Wing.