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Ann Arbor — Ann Arbor has issued a public advisory after an estimated 36,000 gallons of sewage overflowed near Bird Hills Nature Area.

The Ann Arbor News reports the city is recommending that park visitors this week stay on pathways and keep dogs on leashes. Sewage flowed over land into a tributary of the Huron River before the source was discovered Monday.

The city received a report of sewage odor in the woods near Bird Hills Nature Area on Friday night. Crews investigated over the weekend before finding the overflow coming from a manhole. Officials say roots had grown through a sewer pipe, blocking flow.

Officials say the area will be treated with white powder lime. They say they don’t believe there are health risks along the river due to dilution.

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