When will the mayflies swarm in Lancaster County?

And so it begins. Mayflies have begun hatching in the Susquehanna River.

Columbia recently began darkening the lights on the Veterans Memorial Bridge between Columbia and Wrightsville to stave off accelerated mayfly hatches caused by recent hot weather.

The typical hatching period is late June to early July, said riverkeeper Ted Evgeniadis.

In previous years, hoards of mayflies have swarmed manmade structures near the Susquehanna River -- including the Veterans Memorial Bridge that connects Columbia to Wrightsville.

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