Columbia County is a county in South Central Wisconsin.
The seat and largest city is Portage.
It borders Marquette, Green Lake, Dodge, Dane, Sauk, Juneau and Adams Counties.
Main highways include I-90/I-94, I-39, US-51, US-151, WI-13, WI-16, WI-60, WI-113 and WI-22.
Merrimac Rail Bridge
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