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River des Peres and Mississippi River listed as impaired
September 20, 2026
River des Peres is listed as impaired under the Clean Water Act, requiring a cleanup plan (TMDL). The Mississippi River segments in Illinois near River Hills are also listed as impaired, with assessments completed in the current 2026 cycle. These listings indicate state assessment of the waters' failure to meet designated uses.
Silver carp found near Alton
September 20, 2026
Silver carp (), a federally threatened invasive species, were recorded at Lock and Dam Way in Alton, IL on September 16, 2026 and at other locations in August and September. The species is native to Asia but widely farmed globally; escapes from aquaculture establish feral populations that outcompete native fish through filter feeding.
Monarch butterflies passing through St. Louis
September 20, 2026
Monarchs were observed on 2026-09-19, 2026-09-18, and 2026-09-16 in the St. Louis area during fall migration. The species is proposed for threatened listing, and recent sightings record their passage through this region as populations face continued pressure from habitat loss.
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