At approximately 11:45 a.m. Tuesday, May 2, 2023, city staff was notified of sewage coming out of a manhole near the entrance to the University of Michigan Arboretum on Washington Heights. Public works staff immediately investigated and found a blockage in the sewer pipe, which turned out to be gravel and dirt from a collapsed sewer pipe. The overflow caused an estimated 200 gallons of sewage to overflow onto the ground, which then flowed down a gravel pathway toward the Arboretum. No sewage reached any storm drain or waterway.

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