Ownership and maintenance of NY 31B 's former routing was gradually transferred to the counties it went through , namely Cayuga and Onondaga . The first section to be transferred was the portion within Onondaga County , which was given to the county on April 1 , 1980 , and designated as CR 99 . The Cayuga County section of former NY 31B was transferred to the county one year later on April 1 , 1981 , and designated as CR 31B for the state route that preceded it .