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Regulation of the Feather River by Oroville Dam (beginning in 1967) changed the streamflow and sediment discharge downstream from the dam. Changes in channel geometry to adjust to the new regimen were still in process in 1975. Streamflow and sediment concentration and discharge had decreased. Median streamflow at Feather River near Gridley and Feather River at Yuba City, 27 miles and 49 miles downstream from the dam, had not changed, although the frequency of flow rates less than median increased and the frequency of flow rates greater than median, and which transport most sediment, decreased. An estimated average total sediment discharge of 3,730 tons is trapped daily by Oroville Dam. This was the amount of material historically (1902-62) furnished to the channel downstream from the dam, and it influenced channel morphology. Surveys of selected channel cross sections downstream from Oroville Dam indicate net scour since 1911 and an apparent increase in rate of scour in the period 1965-70. Sedimenttransport data indicate an increase in sediment yield (tons per square mile) from the 1965-67 period to the 1968-75 period in the basin downstream from Gridley to Yuba City, although the quantity of sediment transported was reduced owing to removal of sediment by storage behind Oroville Dam and to reduced streamflow. The increase in yield, assuming no change in tributary inflow, may he attributed partly to channel erosion accelerated by the clear-water releases and partly to the change in frequency and magnitude of flow rates.

Sediment transport in the Feather River, Lake Oroville to Yuba City, California