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The Middle Fork Willamette River is formed in northeastern Douglas County by the joining of several small headwater streams near Emigrant Pass. It flows generally north, through the Calapooya Mountains, to the vicinity of Eugene, where it joins the Coast Fork Willamette River to form the Willamette River proper.
Just south, upriver, of Oakridge the Middle Fork is impounded in Hills Creek Reservoir, created by Hills Creek Dam. Downriver from the dam and Oakridge, the Middle Fork is joined by the North Fork Middle Fork Willamette River. Below this confluence, the Middle Fork is impounded by two more reservoirs, Lookout Point Reservoir and Dexter Reservoir, before joining the Coast Fork and forming the main Willamette River.
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