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Willamette Valley map showing main stem and major tributaries. The Willamette River drains a region of 11,478 square miles (29,730 km 2), which is 12 percent of the total area of Oregon. [4] Bounded by the Coast Range to the west and the Cascade Range to the east, the river basin is about 180 miles (290 km) long and 100 miles (160 km) wide. [13]
Overview of Oregon river drainage basins. This is a partial listing of rivers in the state of Oregon, United States. This list of Oregon rivers is organized alphabetically and by tributary structure. The list may also include streams known as creeks, brooks, forks, branches and prongs, as well as sloughs and channels.
The Crooked River is a tributary, 125 miles (201 km) long, of the Deschutes River in the U.S. state of Oregon. [4] The river begins at the confluence of the South Fork Crooked River and Beaver Creek in southeastern Crook County. Of the two tributaries, the South Fork Crooked River is the larger and is sometimes considered part of the Crooked ...
The river then passes Skinner Butte Park, which is on the left, and under Interstate 105 (I-105). Turning north, the river flows between East Bank Park on the right and West Bank Park on the left and passes under the Greenway Bike Bridge and then the Owosso Bike Bridge before passing under Oregon Route 569 (Beltline Highway) and leaving the city.
Constrained by dikes, the channel is about one-third as wide as the lower Willamette main stem. [3] U.S. Route 30 and tracks of the Burlington Northern Railroad run roughly parallel to the channel, and to its left, between its source and the Multnomah–Columbia county border at about the channel's river mile (RM) 12.5 or river kilometer (RK) 20.1.
The Millicoma River is a coast stream, about 8.5 miles (13.7 km) long, east of Coos Bay in the U.S. state of Oregon.Formed by the confluence of the East Fork Millicoma River and the West Fork Millicoma River at Allegany, it meanders across relatively flat land to meet the South Fork Coos River, with which it forms the Coos River.
The Molalla River is a 51-mile (82 km) tributary of the Willamette River in the northwestern part of Oregon in the United States. Flowing northwest from the Cascade Range through Table Rock Wilderness, it passes the city of Molalla before entering the larger river near Canby. The Molalla is the largest Willamette tributary unblocked by a dam.
The Little Clatskanie River is a short tributary of the Clatskanie River in Columbia County in the U.S. state of Oregon.It begins near Sarafin Point in the Northern Oregon Coast Range northwest of St. Helens and flows generally north to meet the larger stream near the unincorporated community of Apiary.