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"Much of the
watershed is mountainous with elevations ranging from about 375 feet above sea
level near the river’s mouth to 10,358 feet at the summit of South Sister.
Approximately 90 percent of the watershed lies above 1,000 feet in elevation and
70 percent is above 2,000 feet. Most of the basin consists of steep ridges
with a narrow
band of level land in the valleys along the McKenzie and Mohawk
rivers. Upper reaches of the McKenzie River flow through a lava plateau 5,500 to
6,000 feet in elevation with the floodplain broadening down river below Deerhorn."
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