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The western tributaries of the Sacramento River, from Clear Creek in the north to Putah Creek in the south, drain an area of more than 7,000 square miles. Major impoundments in the area at present have a combined storage capacity of about 2.5 million acre-feet, and proposed impoundments would add 3-7.5 million more acre-feet of storage. About 960,000 acre-feet of water is imported to the region from the Trinity River annually, and plans call for the annual importation in the future of 700,000-950,000 acre-feet from the Eel River basin. Most of this imported water will be conveyed to areas of water deficiency south of the study area. The quantity of sediment carried by streams and deposited by them may affect both the quality of water and the operational regimen of reservoirs. Because of these possible problems, data on sediment transport have been analyzed to provide planners and engineers with estimates of the quantities involved in the fluvial sediment processes of the study area. In the basins studied, average annual yields of suspended sediment range from less than 100 tons to more than 3,000 tons per square mile, and bedloads range from 2 to 7 percent of the total sediment discharge. Suspended-sediment yield shows a general correlation with geologic province the highest yields are from the basins draining the Coast Ranges province, the lowest yields from the Great Valley of California province, and the intermediate yields from the Klamath Mountains province. Total average annual yield of suspended sediment from the study area is probably about 4.7 million tons. A substantial part of this, perhaps 30 percent, is retained by entrapment as deposits in lakes and reservoirs within the region ; the remaining 70 percent is transported from the regions, most of it during relatively short periods of high streamflow. INTRODUCTION The western tributaries of the Sacramento Biver yield, large quantities of good-quality water. Extensive development of the area's water resources is either underway or planned (California Department of Water Resources, 1970) to control floods and provide water for irrigation, recreation, municipal supply, and wildlife enhancement. Each Jl J2 SEDIMENTATION IN SMALL DRAINAGE BASINS development plan includes several impoundments, as well as other engineering works that will affect the regimen of streamflow. The western tributaries are the subject of this report because the quantity of available data together with the need for information concerning the region make a separate report appropriate. Sediment yield from the eastern tributaries.is relatively low, and sediment from that part of the basin has therefore posed fewer problems. The limited data from the eastern tributaries have not been analyzed. This report summarizes and analyzes much of the available sediment data gathered from the western tributaries. Hopefully, the information provided here will be valuable in the design and operation of the waterdevelopment system. The sediment-transport characteristics of streams may be an important factor in the selection of reservoir sites. The deposition of large quantities of sediment can shorten the useful life of a reservoir, and fine sediment particles remaining in suspension in a reservoir can cause persistent turbidity downstream. The creation of large mainstream reservoirs can bring about pronounced changes in downstream fluvial processes. For example, the trapping of coarse sediment by a reservoir may leave the unladen stream with a renewed ability to erode, and thereby result in degradation of the downstream channel; on the other hand, the reduction of floodflows may reduce the gross competency of the stream and cause aggradation downstream. A sediment-sampling program has been conducted by the Water Resources Division of the U.S. Geological Survey in cooperation with Federal, State, and local agencies, as part of the Survey's appraisal of the Nation's resources. Data collected in the course of this program were used to develop estimates of the long-term transport of suspended sediment from the basins in the study area. This study was conducted by personnel of the Water Resources Division, U.S. Geological Survey, in cooperation with the California Department of Water Resources. The work was under the direct supervision of Willard W. Dean, chief of the Sacramento subdistrict, and under the general supervision of R. Stanley Lord, district chief in charge of water-resources investigations in California. DESCRIPTION OF THE AREA The study area includes the basins of the western tributaries of the Sacramento River from Putah Creek in the south to Clear Creek in the north. The area, about 7,070 square miles, is shown in figure 1. The streams drain the east flank of the Coast Ranges and the southeastern Klamath Mountains and are tributary to the Sacramento River, either directly or by way of one of the floodways which parallel the river. Data used in this report were collected at the sites listed in table 1; locations of the sites are shown in figure 1. SEDIMENT TRANSPORT IN SACRAMENTO RIVEK J3

Sediment transport in the western tributaries of the Sacramento River, California