Seventy-seven rivers and creeks of at least 50Â miles (80Â km) in total length are the longest streams of the U.S. state of Oregon. All of these streams originate in the United States except the longest, the Columbia, which begins in the Canadian province of British Columbia and flows 1,249Â miles (2,010Â km) to the sea near Astoria. The second-longest, the Snake River, which at 1,078 miles (1,735Â km) is the only other stream of more than 1,000 miles (1,600Â km) on the list, begins in Wyoming and flows through parts of Idaho and Washington, as well as Oregon. Some of the other streams also cross borders between Oregon and California, Nevada, Idaho, or Washington, but the majority flow entirely within Oregon.
The Atlas of Oregon ranks 31 rivers in the state by average streamflow; the top five are the Columbia, Snake, Willamette, Santiam, and Umpqua. Not all Oregon rivers with high average flows are on this list of longest streams because neither their main stems nor any of their tributaries (including what are called "forks") are at least 50 miles (80 km) long. High-flow streams mentioned in the Atlas but not included in this long-stream list are the Metolius, Hood, Youngs, and Coos rivers. On the other hand, the list includes four low-flow intermittent streamsâ€"Dry River, Rattlesnake Creek, Rock Creek, and Dry Creekâ€"that cross parts of the Oregon High Desert.
The direction of Oregon stream flow is influenced by four major drainage divides: the Oregon Coast Range on the west, the Cascade Range further inland, the Klamathâ€"Siskiyou Mountains in the southwest, and the Blue Mountains in the northeast. One set of streams, including the Nehalem River, flows directly into the Pacific Ocean or into larger streams flowing directly to the Pacific; other streams, such as the Deschutes River, flow into the Columbia River or its tributaries. A third set, including the Klamath River and its tributaries, originates in Oregon, but its waters eventually flow into northern California before reaching the ocean. Other streams like the Donner und Blitzen River flow into closed basins, such as Malheur Lake, that have no outlet to the sea.
Source data for the table below came from topographic maps created by the United States Geological Survey and published on-line by TopoQuest, and from the Atlas of Oregon; the Oregon Atlas and Gazetteer; two federally produced geographic information system (GIS) datasetsâ€"the National Hydrography Dataset and the National Watershed Boundary Datasetâ€"and other sources as noted. In the table, total lengths are given in miles (mi) and kilometers (km), and elevations are in feet (ft) and meters (m).
Rivers and creeks
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See also
- List of rivers of Oregon
- List of longest rivers in the United States by state
Notes and references
- Notes
- References
Works cited
- Allan, Stuart; Buckley, Aileen R.; Meacham, James E. (2001) [1976]. Loy, William G., ed. Atlas of Oregon (2 ed.). Eugene, Oregon: University of Oregon Press. ISBNÂ 978-0-87114-101-9.Â
- Carter, James L.; Resh, Vincent H. (2005a). "Chapter 12: Pacific Coast Rivers of the Coterminous United States". In Benke, Arthur C.; Cushing, Colbert E. Rivers of North America. Burlington, Massachusetts: Elsevier Academic Press. ISBNÂ 978-0-12-088253-3.Â
- Palmer, Tim (2014). Field Guide to Oregon Rivers. Corvallis, Oregon: Oregon State University Press. ISBNÂ 978-0-87071-627-0.Â
- Sheehan, Madelynne Diness (2005). Fishing in Oregon: The Complete Oregon Fishing Guide (10th ed.). Scappoose, Oregon: Flying Pencil Publications. ISBNÂ 978-0-916473-15-0.Â
- Stanford, Jack A.; Gregory, Stanley V.; Hauer, F. Richard; Snyder, Eric B. (2005b). "Chapter 13: Columbia River Basin". In Benke, Arthur C.; Cushing, Colbert E. Rivers of North America. Burlington, Massachusetts: Elsevier Academic Press. ISBNÂ 978-0-12-088253-3.Â
External links
- Map of Oregon drainage basins published by State of Oregon Water Resources Department
