Pennsylvania, one of the nation's heralded trout fishing states, has always been known for its bountiful mayfly hatches. But fishermen telling tales of "epic" hatches may have a new yardstick to measure their stories against, after hatches in Lancaster County resulted in numerous motor vehicle accidents and caused officials to enforce bridge closures for the second night in a row.
The hatches seem to be predominantly hexagenia mayflies, though photos circulated on the internet seem to show other mayflies and stoneflies present as well.