Total Sediment Transport in the Lower Colorado River

Construction of major dams on the Lower Colorado River below Grand Canyon has caused continuous channel adjustments between these structures. Channel degradation below each dam and aggradation above each reservoir have created problems of river channel control. To aid in evaluating these problems, the United States Bureau of Reclamation, in 1955, initiated a total sediment load sampling program. This program consists of periodic sampling at a series of stations between Davis and Imperial Dams. The sampling program, which was established to provide comprehensive data for evaluation and solution of the channel problems, is presented. The methods of sampling, computation, and analysis are described; results of the program over the first 4yr are given; and new developments and procedures, derived from program evaluation, are dis cussed.