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Higher mercury in St. Louis River walleyes comes from old pollution A new study shows mercury in the estuary sediment was left by industry decades ago. It continues to build up in fish, making some unsafe to eat. 6:05 am, Apr. 17, 2021 × Clough Island in the St. Louis River estuary. A new study has found that the source of unusually high mercury levels in estuary fish is legacy mercury from decades ago that remains in the sediment. (Bob King/ News Tribune file / 2012) For decades now, health officials in Minnesota and Wisconsin have warned people to limit their meals of...

Howard’s Bay dredging moves forward December 14, 2020, by Eldin Ganic Utilizing Great Lakes Restoration Initiative funding under the EPA’s Great Lakes Legacy Act Authority, USACE continues remediation of contaminated sediment from Howard’s Bay in the Duluth-Superior Harbor at Superior, Wisconsin. “Construction started this fall and, once complete next calendar year, we will dredge approximately 132,000 cubic yards of material, 52,000 cy of non-contaminated navigation dredging and 80,000 cy of contaminated sediment,” USACE said in their lates...