D. A. Curtiss 1975 <p>This report summarizes sediment data collected at 11 sites in the Umpqua River basin from 1956 to 1973 and updates a report by C. A. Onions (1969) of estimated sediment yields in the basin from 1956-67. &nbsp;Onions' report points out that the suspended-sediment data, collected during the 1956-67 period, were insufficient to compute reliable sediment yields. &nbsp;Therefore, the U.S, Geological Survey, in cooperation with Douglas County, collected additional data from 1969 to 1973 to improve the water discharge-sediment discharge relationships at these sites. &nbsp;These data are published in "Water resources data for Oregon, Part 2, Water quality records," 1970 through 1973 water years. &nbsp;In addition to the 10 original sites, data were collected during this period from the Umpqua River near Elkton station, and a summary of the data for that station is included in table 1.</p> application/pdf 10.3133/70174075 en U.S. Geological Survey Sediment yields of streams in the Umpqua River Basin, Oregon reports