I have not noticed that depot for decades now. All of the railroad tracks through Sauk City and Prairie du Sac have done the "rails to trails" conversion and are actually paved in asphalt now. The old rail bridge across the river is removed, but a decent eagle watching location now.
I guess according to this Facebook group, the building is incorporated into a larger retail space now and looks different.
Sauk City - Prairie du Sac depot and some new replica construction. The original rectangular depot is now a business. The new construction is in the theme of a railroad depot. I thought it was a...
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And on a tangent, the old depot in my hometown of Sun Prairie is gone. Mini warehouses now on the site next to the grain towers I posted.