Mahogany dun and giant mayflies emerge in Athens County streams

September 22, 2026

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mayflies were observed on 2026-09-17 near Athens County, and giant mayflies on 2026-08-14 and 2026-08-09.¹ These clean-water taxa require well-oxygenated streams and indicate functional aquatic habitat.¹ Late summer through early autumn is the normal emergence window for these species in eastern streams.¹

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