[44] People of the south were more nomadic, traveling from place to place with the seasons. Confident Boating. This area is the Willamette Floodplain, the largest remaining unplowed native grassland in the North Pacific geologic province, which encompasses most of the Pacific Northwest coast. This chart is available for purchase online. These included the Kalapuya, the Chinook, and the Clackamas. Click for Enlarged View. ; Norman, James B. All rights reserved. ", "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. [149] The central valley—a former perennial grass prairie interspersed with oaks, ponderosa pines, and other trees—is devoted almost entirely to farming. Similarly, the river was shortened by 40 percent in the stretch between Harrisburg and Albany. The water trail system is meant to protect and restore waterways in the United States and enhance recreation on and near them. [46], In 2008, government agencies and the non-profit Willamette Riverkeeper organization designated the full length of the river as the Willamette River Water Trail. [114], 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.

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