Wisconsin State Route 66 is an east-west highway across Portage County. It goes from Wisconsin State Route 49, near Rosholt, to the Portage/Wood County Line, near Biron. WI St Rt 66 passes through the following towns in Portage County. Rosholt Ellis Park Ridge Stevens Point
WI St Rt 66 is multi-plexed in Portage County. Interstate 39, at Stevens Point. U.S. Rt. 10, at Stevens Point. U.S. Rt. 51, at Stevens Point.