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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 .
Willamette Lowland basin-fill aquifer Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
Middle Fork Willamette River: Primary outflows: Middle Fork Willamette River: Catchment area: 1,002 square miles (2,600 km 2) Basin countries: United States: Surface area: 1,025 acres (415 ha) Average depth: 27 feet (8.2 m) Max. depth: 56 feet (17 m) Water volume: 29,990 acre-feet (36,990,000 m 3) Residence time: less than one month: Shore ...
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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.
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.
In areas that are open for retention of coho salmon in the Willamette River basin upstream of Willamette Falls, anglers with a valid 2024 Oregon two-rod validation may fish with two rods including ...