 Once heavily dependent on the oil industry , economic downturn and subsequent diversification efforts created an economic base in the energy , finance , aviation , telecommunications and technology sectors . The Tulsa Port of Catoosa , at the head of the McClellan @-@ Kerr Arkansas River Navigation System , is the most inland river port in the U.S. with access to international waterways . Two institutions of higher education within the city have sports teams at the NCAA Division I level , Oral Roberts University and the University of Tulsa . 
