It’s a long-standing natural event that repeats every summer, but there’s a new twist this year: The Pennsylvania Department of Transportation has launched a study into why mayflies are attracted to the above-deck lighting on the Route 462 Veterans Memorial (Columbia-Wrightsville) Bridge.
MORE:
https://www.pennlive.com/life/2020/06/mayfly-season-is-here-with-a-new-twist-for-2020.html
Columbia Spy 