 The U.S. Department of Transportation (USDOT) officially announced in early May 2015 that it had upgraded MKARNS from "Connector" to "Corridor" on the National Marine Highway.The announcement also added the Oklahoma Department of Transportation (ODOT) as an official sponsor.In 2015, the U. S. Army Corps of Engineers had increased its designation of the MKARNS from a moderate-use to a high-use waterway system.