This study was sponsored cooperatively by the Natural Resource Economics Division, Economic Research Service, U.S. Department of Agriculture, and the Center for Agricultural and Rural Development at Iowa State University. Some data are taken from a previous cooperative study of the Iowa-Cedar Rivers Basin conducted by several agencies of the U.S. Department of Agriculture. We are indebted to the Iowa-Cedar Rivers Basin Field Advisory Committee for making these data available. Specific thanks go to Paul Rosenberry and colleagues in the Natural Resource Economics Division. Our thanks also go to Wilson T. Moon, Bill Brune, Bob Boyce, Ed Burr, Russell Knutson, and the members of the River Basin Party of the Soil Conservation Service, U.S. Department of Agriculture, Des Moines.