About one hundred samples of beach and bottom sediments of Lake Elsinore were taken. Using the results of mechanical analyses and heavy mineral studies of the beach sediments, the shoreline has been divided into three zones. From histograms of grain-size frequency of all the samples, six distinct types of sediments were recognized. Transverse and longitudinal profiles of bottom samples were constructed showing grain-size frequency, median diameter, depth, and distance from shore, and the interrelationships of these factors are discussed. Heavy mineral suites and relative frequencies of the species are given in a histogram.