Compiled by International Engineering Company, San Francisco, and J. W. Johnson. Includes correspondence, maps, preliminary report, Scour problems at the Southern Pacific Railroad Bridge near Surf, California, and background reports: Mechanics of local scour, June 1966 , by H. W. Shen, V. R. Schneiderand S. S. Karaki; Mechanics of local scour supplement: methods of reducing scour, June 1966, by H. W. Shen, V. R. Schneider and S. S. Karaki; Why bridges fail in floods: model tests of erosion around bridge piers indicate depth of scour in erodible material, by C. J. Posey (from Civil Engineering, February 1949); Local scour around cylindrical piers, by H. N. C. Breusers, G. Nicollet,and H. W. Shen (from Journal of Hydraulic Research, v. 15:3, 1977).