(CNN) Money is slowly trickling into a Michigan police station after a man accidentally spilled $30,000 onto a highway.

A cardboard box full of cash fell from the back of the man's truck onto US 31 in Grand Haven on Thursday, the city's Department of Public Safety said.

Police responded after reports that traffic was backing up as motorists stopped to pick up bills "strewn in the roadway."

"Officers temporarily closed traffic lanes and were assisted by witnesses with picking up the money," the department said in a statement Thursday.

The owner of the money eventually arrived, telling officers he had been carrying approximately $30,000.

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