Maintenance of the route is split between NYSDOT, the New York State Thruway Authority (NYSTA), and Erie County. All but the northernmost of the portion of the route that overlaps with I-190 is maintained by NYSTA. The two county-maintained sections extend from exit 20B to Grand Island Boulevard on Grand Island and from exit 15 to Grand Island Boulevard in Tonawanda, where NY 324 utilizes small portions of the county-owned Long Road and Kenmore Avenue, respectively. The remainder of NY 324 is maintained by NYSDOT.