This study was conducted to determine the current and future supply of scrap tire rubber and the feasibility of using scrap tires in Kansas for various purposes. The goal was to determine if a sufficient quantity of recycled rubber existed and what the cost would be to meet the ISTEA (Intermodal Surface Transportation Efficiency Act) requirements for 1995 and thereafter. The four tasks included in the study were: surveying scrap tire utilization plans in other states; inventorying scrap tires in Kansas; estimating scrap tire generation in the future; and determining cost effectiveness of various uses of scrap tires. Currently there are 4.5 to 5.5 million scrap tires in Kansas and the annual generation of scrap tires is estimated to be 2 to 3 million. The ISTEA mandate would require an estimated 367,000 scrap tires be recycled annually. The Kansas Department of Transportation has used more rubber in 1993 and 1994 than will be required by 1997 when the 20% required by ISTEA is in effect. The most energetically and economically feasible method of disposal of scrap tires is as a fuel substitute for coal or natural gas in a co-fired application or in a dedicated scrap tire-to-energy facility. One of the cement producers in Kansas currently uses between 250,000 and 600,000 scrap tires annually for fuel.