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The valley averages approximately 1 mi (1.6 km) wide, with the valley floor averaging between 300 and 600 ft (91 and 183 m) below the surrounding bluffs. The valley was extensively dammed between 1946 and 1966 to provide a series of reservoirs in the
Dakotas. Geologically, the
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has added markedly to the sediment in the river as it flows through the valley, the water was turbid even before the widespread introduction of
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now provides a major challenge for the impounded sections of the river in the valley.
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135:agriculture
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