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Considered a 100-year flood, [2] it was the worst flood in recorded history on nearly every major stream and river in coastal Northern California and one of the worst to affect the Willamette River in Oregon. It also affected parts of southwest Washington, Idaho, and Nevada. [1] [3]
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]
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This flooding prompted flood control measures to be built along the Willamette River. [48] This major flood between December 18, 1964, and January 7, 1965, [49] also impacted portions of southwest Washington, Idaho, Nevada, and especially northern California.
Concerns aren’t nearly as high about additional flooding in the Willamette Valley. The level of the Willamette River in Salem, for example, has been downgraded to about 18 feet while smaller ...
Extremes outside the period of record include flood maximums during the roughly 110 years before the Morrison Bridge gauge was put in place. The biggest recorded Willamette River flood, the Great Flood of 1861, [27] produced a much larger maximum, 635,000 cubic feet per second (18,000 m 3 /s), in downtown Portland than that of the 1996 flood. [28]
Muessle added that while rivers will rise, flooding isn’t expected to occur, largely because of how dry Oregon had become following a “flash drought” that sucked the soil dry during April.
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