Most of the county routes act as primary roads in the less developed areas and also serve to interconnect the various villages and hamlets of Niagara County.

Most of the roads in the County, including many of the local through highways, are maintained by the towns.

The fourth, CR 907, is a designation for a 5-mile (8.0 km) long county-maintained portion of NY 18F alongside the Niagara River.

All four highways were assigned by 1996 and are marked on New York State Department of Transportation digital raster quadrangles.

CR 907 is the highest three-digit county route in terms of designation in the state of New York.