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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]
The Willamette River is a 187-mile (301 km) tributary of the Columbia River in the U.S. state of Oregon. The upper tributaries of the Willamette originate in mountains south and southeast of the twin cities of Eugene and Springfield .
Aerial view of crossings in downtown Portland. This is a list of bridges and other crossings of the Willamette River in the U.S. state of Oregon from the Columbia River upstream to the confluence of the Middle Fork Willamette River and Coast Fork Willamette River.
The Willamette River in the northern section of the valley. The Willamette Valley is prone to periodic floods. Notable floods include the Great Flood of 1862, events in 1899, the Christmas flood of 1964, and the Willamette Valley flood of 1996. Part of its floodplain is a National Natural Landmark called the Willamette Floodplain.
The McKenzie River is a 90-mile (145 km) tributary of the Willamette River in western Oregon in the United States. It drains part of the Cascade Range east of Eugene and flows westward into the southernmost end of the Willamette Valley.
The Middle Fork Willamette River is one of several forks that unite to form the Willamette River in the western part of the U.S. state of Oregon.It is approximately 115 miles (185 km) long, [1] draining an area of the Cascade Range southeast of Eugene, which is at the southern end of the Willamette Valley.
High water floods a pathway in Minto Brown Island Park on Thursday, Jan. 14, 2021. High water from rain caused the level of the Willamette River to reach near action levels and caused trails ...
The Coast Fork Willamette River is formed in southwestern Lane County, in the Calapooya Mountains, by the confluence of the Little River and the Big River.The Coast Fork flows north through the mountains, through the Cottage Grove Lake reservoir, to Cottage Grove, where it receives the Row River from the southeast.