The Madison Police Department said the 43-year-old woman was walking to work Monday morning on the near east side of the city when she spotted a large denomination bill in the snow near the sidewalk, WISC-TV, Madison, reported Tuesday.
The woman went in for a closer look and discovered several more bills spread out in the area. She turned the cash over to police.
Police said they would not released the exact amount of cash, "but suffice to say it is significant."
Police Lt. Cory Nelson told the Wisconsin State Journal anyone thinking of claiming the money if it is not legitimately theirs should keep in mind it is a crime to file a false police report.
"If anybody claims it, they'll need to know how much was missing," he said. "They might also need to provide some kind of receipt if they had just come from a bank."
Nelson said the money could be given to the woman who found it if no one comes forward with a valid claim on it.
"I give the lady who turned it in credit," he said. "Not a lot of people would have done that."