The recreation phase of the Ohio River Basin Comprehensive Survey endeavors to determine the prospective demands and needs for water-related outdoor recreation opportunities in the Ohio River Basin in the years 1980, 2000, and 2020. The needs are presented relative to the supply in the base year, 1960. The methodology used in ascertaining the outdoor recreation demands and needs utilizes individual recreation activity participation rates and estimates of increases in recreation demand developed in the Outdoor Recreation Resources Review Commission Study Reports 1 through 27. Eight outdoor recreation activities considered in the ORRRC studies were determined to be water-enhanced or water-dependent and were used in developing the prospective demands for water-related recreation facilities in the basin. The selected activities were: swimming, boating, water skiing, picnicking, camping, sightseeing, nature walks, and hiking. The recreational needs (unsatisfied demands) in the basin were determined by relating inventoried 1960 supply to the estimated demands in the target years. The 1960 supply was considered to be the 1960 visitation at basin facilities administered by Federal, state, and local agencies and was obtained from the nationwide plan inventory developed by the Bureau of Outdoor Recreation in conjunction with Federal, state, and local agencies.