Small watershed flood control development (Public Law 566) has had varying impacts on structure site land values. Economics, location, climate, and land use differences were found to be important factors in assessing land value changes. Oklahoma and Nebraska data indicate that onsite land value changes due to the program range from a negative 37.75 percent to a positive 24.2 percent, depending on estimating and deflating procedures. Data also indicate that easement expenditures for flood control structure sites usually exceed the 25 to 38 percent compensation necessary to leave landowners in the same financial position before and after the transfer of land rights.