Annual sediment discharges at eight gaging stations are listed in table 7 . Annual totals of daily mean discharge are listed for the same gaging stations in table 8 . Reduction of sediment discharge in the Toutle River and the upper Lewis River basins is evident in semilogarithmic plots of annual sediment discharge by time in water years (figs. 49 and 50 ). The greatest reductions were in the North Fork Toutle River and the mainstem Toutle River (fig. 49). Annual sediment discharges in those two streams declined from 40 to 10 million tons during water years 1982-85. Water year 1985 had a low annual stream discharge, which probably reduced the annual sediment discharge. However, high storm discharges in water years 1986 and 1987 did not produce annual sediment discharges much greater than water year 1985. The closure in November 1987 of the SRS on the North Fork Toutle River finally reduced the annual sediment discharge at Kid Valley in water year 1990 to less than 1 million tons (fig. 49).
In 1990, annual sediment discharges of the Muddy River and the Green River were about one-fifth of those measured in 1982. The reduction of annual sediment discharge of the South Fork Toutle River was more gradual (fig. 49). The South Fork Toutle River at Camp 12 had an annual sediment discharge in 1990 that was still 66 percent of the annual sediment discharge in 1982.
