The 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. It is a single-span Bowstring arch truss bridge which is 80 ft long and 16 ft wide. The span was built in 1876 by the Wrought Iron Bridge Co. of Ohio, as one of four spans in a bridge crossing in Concordia, Kansas. Later the four spans were removed to different locations in the area. It crosses West Creek, a tributary to the Republican River. As of 2010, the bridge is open to one-lane automobile traffic on a low-maintenance county road.