Massive Amounts of Dead Mayflies at Lock and Dam in Welch, Minn.
WELCH, Minn. (KMSP) – The crew at the U.S. Army Corps of Engineers Lock and Dam No. 3 on the MississippiRiver in Welch, Minnesota had a bit of a bug problem to deal with on Wednesday. It’s mayfly season, and mounds of dead mayflies resembling piles of mulch littered the lock and dam. Every summer, millions of mayflies lay their eggs…


