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to the gold diggings via elaborate canal and flume systems, which directly preceded the irrigation districts formed by farmers who sought a greater degree of river control. Starting in the early 1900s, many dams were built to store and divert water; these were often paired with hydro-power systems, whose revenues covered the high cost of the water projects. In the 1970s the construction of the federal New Melones Dam incited major opposition from recreation

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