Someone described the Arch as "a lot going on here" and... yeah. Apparently the museum is less problematic than when I last visited (1981!) but we will not confirm that today.
So it turns out Fort Mifflin still has a Corps of Engineers presence (I thought it was just a museum) and that is the McFarland, a dredger: https://www.dredgingtoday.com/2020/04/24/photo-mcfarland-ready-for-delaware-river-dredging/
@gamehawk I haven't been in there since before I moved away from STL in 1999. But yeah, it was pretty bad.
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