Red speckled dun mayflies persist in Salt Lake City

October 6, 2026

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mayflies (Callibaetis ferrugineus) were observed on 2026-10-02 in Salt Lake City, part of sustained Ephemeroptera activity through late September and early October.¹ Mayfly presence indicates cool, clean, well-oxygenated freshwater habitat; their continued observation across multiple families reflects water conditions favorable for these pollution-sensitive larvae.¹

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