, Further downstream is the oldest remaining highway structure over the Willamette, the Hawthorne Bridge, built in 1910. Locks depths of the Willamette River are at Willamette River Datum and clearances are at the datum of Newberg Pool .  He swam 184 miles (296 km) from Eugene to the river mouth in 25 days.. , Rainstorms and warm temperatures in December 1861 combined with a well-above-average snowpack in the Cascades created the largest Willamette River flood in recorded history. They are used to regulate river flows so as to cut peaks off floods and increase low flows in late summer and autumn, and to divert water into deeper, narrower channels to prevent flooding.  The National Weather Service issues tide forecasts for the river at the Morrison Bridge. Paper Size: 36.0" x 44.0" The machinery to operate the swing span was removed in the 1950s. Willamette Zone Regulations. LNM: http://ocsdata.ncd.noaa.gov/nm, NTM = NGA Notice to MarinersLNM = Local Notice to Mariners. The Santiam is most often fished in its two main forks, known as the North and South Forks, especially for salmon and steelhead runs below the reservoirs.  Each flood produced "discharges that exceeded the annual discharge of all the present-day rivers of the world combined".  The U.S. Census Bureau estimated that the Chinook population was nearly 5,000, though not all of the Chinook lived on the Willamette. Significant tributaries from source to mouth include the Middle and Coast forks and the McKenzie, Long Tom, Marys, Calapooia, Santiam, Luckiamute, Yamhill, Molalla, Tualatin, and Clackamas rivers. Each lock chamber measured 210 feet (64 m) long and 40 feet (12 m) wide, and the canal was originally operated manually before it switched to electrical power.  Further upstream, the pressing environmental issues have mainly been variations in pH and dissolved oxygen. Among the 29 non-native species in the basin, there are brook, brown, and lake trout, largemouth and smallmouth bass, walleye, carp, bluegill, and others. Use the link below to access the Oregon State Parks Willamette River Guide Maps of the Willamette River. Australia, New Zealand, Indonesia, Papua New Guinea, Eastern Asia, South Eastern Russia, Philippines. The Army Corps of Engineers operates 13 such dams, which affect flows from about 40 percent of the basin.  The Oregon State Legislature established the program in 1967.  As of 2009, the basin contained 20 of the 25 most populous cities in Oregon. ", "Linn City, Oregon: A Victim of Nature's Wrath", "Willamette River Is Nearing Crest of Flood Stage", "After the Flood: Portland State Pays Tribute to Vanport Pioneers", "River Flood Waters Reach Oregon Capital", "Flood Inundations/FEMA Floodplains: Floods and Floodplains in the Willamette River", "Floods Spoil Holiday in Oregon, California", "Portland Gets Reprieve from a Big Flood Threat", "1000 Flee Flood in Northwest; Nation Shivers", "Eastern Deep Freeze Eases, but Rain Brings Flood Fears to West", "The Great Flood of 1996: Its Causes and a Comparison to Other Climate Events", "Flood Spreads in Economy Like Muddy Water", "Flood Wall Comes Down Today in Portland", "Oregon Sets Pace in Improving Environment", "The Willamette River: A Renaissance in the Making", "Processes Controlling Dissolved Oxygen and pH in the Upper Willamette River Basin", "Drinking the Willamette: the Power of Public Education", "Oregon Water Quality Index Summary Report, Water Years 1998–2007", "Patterns and Controls on Historical Channel Change in the Willamette River, Oregon, USA", City of Portland River Renaissance Strategy, Historic river channels between Albany and Monmouth, https://en.wikipedia.org/w/index.php?title=Willamette_River&oldid=984433256, Short description is different from Wikidata, Wikipedia articles with WorldCat-VIAF identifiers, Creative Commons Attribution-ShareAlike License, Morrison Bridge, Portland, 12.8 miles (20.6 km) from mouth, Benke, Arthur C., ed., and Cushing, Colbert E., ed. From Mapcarta, the free map. Fishing spots and depth contours layers are available in most Lake maps. Tribes of the northern Willamette Valley practiced a generally settled lifestyle.  An Associated Press journalist reported, "The river crested at one town after another—at Corvallis 3½ feet above flood stage, Oregon City 18 feet above, Portland 10.5 feet above—much like a meal moving through a boa constrictor. Use the link below to access the Oregon State Parks Willamette River Guide Maps of the Willamette River. Indigenous peoples of the Willamette Valley were further divided into groups including the Kalapuyan-speaking Yamhill and Atfalati (Tualatin) (both Northern Kalapuya), Central Kalapuya like the Santiam, Muddy Creek (Chemapho), Long Tom (Chelamela), Calapooia (Tsankupi), Marys River (Chepenafa) and Luckiamute, and the Yoncalla or Southern Kalapuya, as well other tribes such as the Chuchsney-Tufti, Siuslaw and Molala.
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