From 2019 to 2022, the average raw water turbidity at the Oshkosh Water Filtration Plant increased from 6 to 7.4 NTU while the maximum rose from 9.8 to 12.8 NTU.
In August 2022 Mike Harris, a diver with Northern Divers USA, visually inspected the 2,600-foot-long, 60-inch primary intake pipe in Wisconsin’s Lake Winnebago and found it 50-75% occluded with sediment, dead fish and zebra mussels.James Rabe, P.E., public works director, observes, “The blockage didn’t affect our normal demand of 6-10 mgd, but pushing operations near the plant maximum of 16 mgd would have triggered capacity concerns.”The obstruction also increased the pipe’s
