The effectiveness of a guide training program was evaluated as a means of providing interpretive services to commercial boaters at the New River Gorge National River. Commercial river guides attended a National Park Service sponsored training program which provided accurate information and education concerning natural and cultural history of the New River, the national significance of the New River Gorge National River, the history and purpose of the National Park Service, and information and services available at the visitor centers. The emphasis of the training session was to increase the river guides’ knowledge base and to encourage their interpretive presentation of this information to their customers. Customers of a commercial outfitter were administered a questionnaire before and after the guide training program. Significant differences in the amount of interpretation guides presented on the river, the amount of knowledge customers acquired during the trip, and the customers' overall trip rating were noted by empirical testing. Increases in the means of all three outcome variables occurred following guide training. Customers’ intentions to visit a New River Gorge Visitor Center did not significantly change following guide training. The validity and reliability of the instrument is discussed as well as potential biases and constraints of the study. Implications for management and further research are also discussed. / M.S.