Giant mayflies () were observed in Oconomowoc waters on September 18, 2026.1 These pollution-sensitive larvae need clean, well-oxygenated water and their presence indicates habitat conditions suitable for oxygen-demanding aquatic invertebrates.1
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came from Skaneateles, Oswego, Fabius and Moravia. All are community-science sightings still awaiting identification review, and each one marks a species being present at a spot on a date — not abundance, not condition, not a trend. The clean-water reputation mayflies carry as a group doesn't transfer neatly to this particular mix either: Caenis tolerates silt and low oxygen, and Callibaetis is a still-water genus. None of these records fall on the impaired reach, so none of them can speak to what a falling, warming creek is doing to it.
What does change the calculus is the
Syracuse Hancock International Airport
discharge, which entered this month already flagged for a biochemical oxygen demand violation that has tripled twice in three quarters, a trajectory covered in an
earlier report on the airport's oxygen-demand violation
. Less water in the receiving creek means the same permitted discharge has less flow to dilute into, a concern worth watching even without direct downstream water-quality measurements yet in hand. The airport is also the subject of a SEQR determination notice tied to its 2040 expansion, which puts a facility with an active, worsening water-quality violation at the center of a live development decision on a waterway that is currently running at less than half its normal flow.
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