The South Santiam River is a tributary of the Santiam River , about 69 miles (111 km) long, in western Oregon in the United States. It drains an area of the Cascade Range into the Willamette Valley east of Corvallis .
5-850: The Middle Santiam River is a tributary of the South Santiam River , 38.5 miles (62.0 km) long, in western Oregon in the United States . It drains a remote area of the Cascade Range east of Sweet Home in the watershed of the Willamette River . It rises in the Cascades in eastern Linn County in the Willamette National Forest , about half a mile west of Iron Mountain. It flows briefly north, then generally west and southwest through
10-785: A handful of miles before entering Foster Reservoir . At Foster Reservoir the Middle Santiam River joins the South Santiam. Downstream from the reservoir it flows west past Sweet Home , where it turns northwest, passing through the foothills into the Willamette Valley near Lebanon . It joins the North Santiam River from the southeast to form the Santiam approximately 15 mi (24 km) northeast of Lebanon, about 10 miles (16 km) east of
15-482: The Cascades in southeastern Linn County in the Willamette National Forest at 44°22′27″N 122°13′05″W / 44.374291°N 122.218128°W / 44.374291; -122.218128 ( South Santiam River source ) . From this source, the confluence of Sevenmile and Latiwi creeks, it flows briefly north, then generally west through the Western Cascades and Cascadia . It then flows
20-556: The confluence of the Santiam with the Willamette River . U.S. Route 20 follows the valley of the river from near its headwaters in the mountains to the Willamette Valley northwest of Lebanon. Named tributaries from source to mouth are Sevenmile and Latiwi creeks at the headwaters, then Three, Sheep, Elk, Soda Fork, Stewart, and Keith creeks. Then come Boulder, Little Boulder, Trout, Falls, Moose, Canyon, and Wolfe creeks. Further downstream are Dobbin, Soda, Cabin, Bucksnort, Mouse, and Deer creeks. Below those are Shot Pouch Creek and
25-1055: The mountains and Middle Santiam Wilderness . In central Linn County it is impounded at the Green Peter Dam to form the Green Peter Reservoir . Approximately 4 miles (6 km) downstream from the dam it joins the South Santiam from the northeast as an arm of Foster Reservoir . Named tributaries of the Middle Santiam River from source to mouth are Cougar, Holman, Lake, South Pyramid, Bachelor, Pyramid, Donaca, Jude, and Egg creeks, followed by Fitt, Chimney, Sixes, Bear, and Twin Falls creeks. Below that are Cougar, Crash, Maple, Elk, Knickerbocker and Cave creeks. Then come Tally, Quartzville , Whitcomb, Rumbaugh, and Thistle creeks. Finally are Green Peter, Little Bottom, Alder, Coal, and Lewis creeks. Download coordinates as: South Santiam River It rises in
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