County Line Bowstring is a bridge located near unincorporated Hollis, Kansas, United States, that is listed on the National Register of Historic Places. It spans West Creek on the border between Cloud and Republic counties and has a wooden deck with a bowstring pony truss.The bridge was built in 1876 by the Wrought Iron Bridge Co. of OH. As of 2010, the bridge is open to one-lane automobile traffic on a low-maintenance county road.