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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 .
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 river has Oregon's longest covered bridge crossing it at Westfir, the Office Bridge. [3] Portions of the river were designated wild and scenic in 1988. [ 4 ] [ 5 ] The portion from Waldo Lake to 1 mile (1.6 km) upstream from Westfir is designated scenic by the State of Oregon [ 6 ] and is known for its native trout by fly fishermen.
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.
To supply demands for water downriver, a gradual drawdown of lake water begins in July and extends through September. After September, the lake is emptied more rapidly to make room for high river flows that enter the lake during the winter. The Lookout Point and Dexter projects are among 13 built by the Corps in the Willamette Valley. [2]
Willamette Valley cities typically average between 6 to 8 inches for the entire month. On the coast, Astoria has seen 6.5 inches of rain while Tillamook got 6.33 inches.
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 Willamette River in Salem is forecast to reach about 19 feet, which brings some impact in the Minto Brown Island area. The Willamette River reached nearly 19 feet near the Wheatland Ferry in ...