This inventory of published and unpublished sediment-load data contains a list of the sediment-transport measurements in the United States and Puerto Rico during October 1950 to September 1960, made by the agencies associated with the Subcommittee on Sedimentation. Some of the agencies have miscellaneous sediment data, such as single observations at scattered stations or observations on very small watersheds, which are not listed in this inventory. Each entry contains the following: drainage area above station, period of record, number or frequency of observations, sampling equipment and method in which it was used, units of expression for load, particle-size analyses, and source of basic data or published results.