Fitch Ratings last week downgraded the town of Port Huron in eastern Michigan to A-plus from AA-minus, affecting $24 million of general obligation bonds.

The downgrade comes amid the city’s weak economy, chronically high unemployment rate and above-average debt load, analysts said. “Substantial borrowing for combined sewer overflows has driven debt to well above average levels,” Fitch analyst Arlene Bohner wrote in a release on the downgrade.

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