Site 1 finds fewer pollution-sensitive animals than its setting predicts, and the gap appears to be widening (p = 0.055, about 11 percentage points a decade).
Great Seneca CreekSteadyScores held near 16.5 before 2013 and 16.6 since; the overall score shows no trend.
Great Seneca CreekWatchBetween 2005–2009 and 2020–2024, damselflies and common net-spinning caddisflies became rarer while dobsonflies and aquatic worms became regulars.
Water chemistryWatchChloride in the creek climbs from about 85 mg/L in summer to winter peaks of 159, still below the EPA's 230.
Neighbouring streamsGood news11 of 31 long-record sites within 30 km show improving scores, the opposite of Site 1's direction.
National pictureContext19,960 sites across the lower 48 states have usable surveys; most are in IA, NJ, VA.
National pictureContextNationally, sensitive animals fall from 40% of groups found in near-natural watersheds to 22% where a quarter or more is paved.
