Final environmental impact statement (EIS) for the Cooper Lake and Channels projects was filed with the Council on Environmental Quality on 24 Jun 1977. Supplemental EIS on Cooper Lake and Channels, Texas dated March 1981 is a reevaluation of the EIS taking into consideration a no action alternative; along with four (4) alternative solutions to these problems identified as flooding, water supply, recreation problems and recreational needs in the Sulphur River Basin. This report reevaluates two plans previously considered for comparison. These new plans are presented to respond to these deficiencies by showing full benefit/cost analysis, and recommending fish and wildlife mitigation plans. Reservoir Only plan was selected as the best overall plan for meeting the project purposes. (Author).