Officials say significant progress has been made toward cleaning up the River Raisin, one of Michigan's most heavily polluted sites.
The river is within the city of Monroe. It's among 14 areas in Michigan designated for special attention because of environmental degradation.
One problem is high levels of nutrient runoff from farms and residential yards that cause excessive algae growth. Another is E. coli pollution resulting from sewer overflows, which leads to beach closures.
But the Michigan Department of Environmental Quality says both types of pollution have been drastically reduced in recent years, partly through state programs that encourage farmers to prevent runoff from their fields. Wastewater treatment plant upgrades have helped as well.
As a result, both of problems are no longer classified as serious impairments for the river.