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Seventy-seven rivers and creeks of at least 50 miles (80 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 1,249 miles (2,010 km) to the sea near Astoria. The second-longest, the Snake River, which at is the only other stream of more than 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.〔Loy, ''et al.'', pp. 162–169〕 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 streams—Dry River, Rattlesnake Creek, Rock Creek, and Dry Creek—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 Klamath–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) datasets—the National Hydrography Dataset and the National Watershed Boundary Dataset—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== } | mi2 668,000 km2〔 | | ft 0 m ||〔(【引用サイトリンク】publisher =Natural Resources Canada )〕 | ft 810 m | Source at Columbia Lake, British Columbia, mouth near Astoria |-- ! scope="row" | Snake River | Columbia River | style="background:#fffdd0;" | mi 1,674 km〔 | mi2 280,000 km2〔 | | ft 109 m | | ft 2,804 m | Source in Absaroka Range, Wyoming, mouth near Tri-Cities, Washington |-- ! scope="row" | Owyhee River | Snake River | style="background:#fffdd0;"| mi 557 km〔 | mi2 28,617 km2〔Benke and Cushing, Chapter 13, p. 647〕|| | ft 666 ft || | ft 2,109 m | Source in Independence Mountains of Nevada, mouth near Nyssa |-- ! scope="row" |Klamath River | Pacific Ocean | style="background:#fffdd0;"| mi 462 km〔 | mi2 40,700 km2〔Benke and Cushing, Chapter 12, p. 563〕 | | ft 0 m | | ft 1,247 m | Source at Upper Klamath Lake, mouth near Crescent City, California |-- ! scope="row" | John Day River | Columbia River | mi 457 km | mi2 21,000 km2〔(【引用サイトリンク】 url = http://www.blm.gov/or/resources/recreation/johnday/ )〕 | | ft 82 m | | ft 2,035 m||Source in Strawberry Range, mouth near Rufus |-- ! scope="row" | Deschutes River | Columbia River | mi 405 km〔|| mi2 26,939 km2 | | ft 50 m | | ft 1,447 m | Source in Cascade Range, mouth near Biggs Junction |-- ! scope="row" | Rogue River | Pacific Ocean | mi 346 km〔 The Hamaker, Oregon, quadrant map includes a river mile (RM) marker for RM 211 (river kilometer 346) near the confluence of the Rogue River with Mazama Creek. The remaining is an estimate based on map scale and ruler.〕|| mi2 13,400 km2〔Benke and Cushing, Chapter 12, p. 569〕 | | ft 0 m | | ft 1,622 m | Source in Cascade Range, mouth near Gold Beach |-- ! scope="row" | Malheur River | Snake River | mi 306 km | mi2 11,940 km2〔|||| ft 650 m | | ft 1,511 m | Source in Strawberry Range, mouth near Ontario |-- ! scope="row" |Willamette River | Columbia River | mi 301 km〔(【引用サイトリンク】 publisher = Willamette Riverkeeper )〕 | mi2 30,000 km2〔 | | ft 3 m || | ft 134 m | Source near Eugene, mouth near Portland |-- ! scope="row" | Grande Ronde River | Snake River | style="background:#fffdd0;"| mi 339 km〔|| mi2 10,240 km2 | | ft 250 m | | ft 2,270 m | Source in Blue Mountains, mouth on Washington–Idaho border |-- ! scope="row" |Powder River | Snake River | mi 246 km〔|| mi2 4,455 km2 | | ft 629 m | | ft 1,342 m | Source in Blue Mountains, mouth near Richland |-- ! scope="row" | Crooked River | Deschutes River | mi 201 km〔 Map quadrants show river mileage from mouth to source.〕 | mi2 11,137 km2〔|||| ft 594 m | | ft 1,105 m | Source near Ochoco Mountains, mouth near Culver |-- ! scope="row" |Middle Fork Willamette River | Willamette River | mi 196 km〔〔Length derived by subtracting the main stem length of from the United States Geological Survey figure of for the main stem plus the Middle Fork〕|| mi2 3,510 km2〔|| | ft 133 m | | ft 1,692 m | Source in Calapooya Mountains, mouth near Springfield |-- ! scope="row" | Nehalem River | Pacific Ocean | mi 192 km | mi2 2,214 km2〔 | | ft 0 m | | ft 740 m | Source in Northern Oregon Coast Range, mouth near Wheeler |-- ! scope="row" | North Fork John Day River | John Day River | mi 188 km〔 | mi2 1,554 km2〔|| || ft 559 m|| | ft 2,260 m | Source in Elkhorn Mountains, mouth near Kimberly |-- ! scope="row" | Umpqua River | Pacific Ocean | mi 180 km〔 The map quadrants include river mile markers from mouth to source.〕|| mi2 12,133 km2〔Benke and Cushing, Chapter 12, p. 585〕 | | ft 0 m | | ft 110 m | Source near Roseburg, mouth near Reedsport |-- ! scope="row" | Siuslaw River | Pacific Ocean | mi 180 km〔 Map quadrangles show river mileage from mouth to source.〕 | mi2 2,000 km2 | | ft 0 m | | ft 193 m | Source in Central Oregon Coast Range, mouth at Florence |-- ! scope="row" | North Umpqua River | Umpqua River | mi 170 km | mi2 3,560 km2 | | ft 110 m|| | ft 1,824 m | Source in Cascade Range, mouth near Roseburg |-- ! scope="row" | South Umpqua River | Umpqua River|| mi 170 km〔 | mi2 4,700 km2 | | ft 110 m | | ft 612 m | Source in Cascade Range, mouth near Roseburg |-- ! scope="row" | Jordan Creek | Owyhee River | style="background:#fffdd0;"| mi 159 km〔(【引用サイトリンク】publisher=United States Geological Survey )〕 || mi2 3,380 km2 | | ft 1,025 m | | ft 2,302 m | Source in Owyhee Mountains of Idaho, mouth near Rome |-- ! scope="row" |Burnt River |Snake River|| mi 158 km〔|| mi2 2,823 km2〔|||| ft 632 m|||| ft 1,166 m ||Source in Blue Mountains, mouth near Huntington |-- ! scope="row" | Silvies River | Malheur Lake | mi 153 km〔Sheehan, p. 290〕 | mi2 3,300 km2|||| ft 1,265 m | | ft 1,722 m | Source in Blue Mountains, mouth near Burns |-- ! scope="row" | North Santiam River | Santiam River | mi 148 km | mi2 1,984 km2〔 | | ft 66 m | | ft 1,565 m | Source in Cascade Range, mouth in Willamette Valley |-- ! scope="row" |Little Deschutes River |Deschutes River|| mi 146 km|| mi2 2,642 km2〔|||| ft 1,269 m|||| ft 1,896 m || Source in Cascade Range, mouth near Sunriver |-- ! scope="row" |Smith River |Umpqua River|| mi 140 km〔 The maps include river mile markers for the lower of the river. The remaining distance is an estimate based on map scale and ruler.〕|| mi2 565 km2〔(【引用サイトリンク】publisher = Smith River Watershed Council )〕|||| mi 0 km|||| ft 429 m ||Source in Central Oregon Coast Range, mouth near Reedsport |-- ! scope="row" |McKenzie River |Willamette River|| mi 145 km〔|| mi2 3,367 km2〔(【引用サイトリンク】publisher= McKenzie Watershed Council )〕 |||| ft 113 m|||| ft 1,088 m ||Source in Cascade Range, mouth near Eugene |-- ! scope="row" |Umatilla River |Columbia River|| mi 143 km|| mi2 6,579 km2〔|||| ft 82 m|||| ft 711 m||Source in Blue Mountains, mouth at Umatilla |-- ! scope="row" |Dry River (intermittent) |Crooked River|| mi 142 km〔|| mi2 1,948 km2〔(【引用サイトリンク】publisher=USDA, NRCS, National Cartography and Geospatial Center ) ArcExplorer GIS data viewer.〕|||| ft 848 m|||| ft 1,794 m||Source in Hampton Buttes near Brothers, mouth upstream of Smith Rock |-- ! scope="row" |Silver Creek |Harney Lake|| mi 140 km〔|| mi2 4,403 km2|||| ft 1,250 m|||| ft 1,777 m||Source in Malheur National Forest, mouth at Harney Lake |-- ! scope="row" |Sprague River |Williamson River|| mi 135 km〔 Retrieved April 11, 2011.〕|| mi2 4,050 km2〔|| || ft 1,269 m|||| ft 1,319 m ||Source on high plateau of eastern Klamath County, mouth near Chiloquin |-- ! scope="row" |Clackamas River |Willamette River|| mi 134 km || mi2 2,435 km2〔|||| ft 3 m |||| ft 1,496 m||Source in Cascade Range, mouth at Gladstone and Oregon City |-- ! scope="row" |Tualatin River |Willamette River|| mi 134 km|| mi2 1,844 km2〔 || || ft 18 m || || ft 603 m ||Source in Northern Oregon Coast Range, mouth near West Linn |-- ! scope="row" |Rock Creek |John Day River|| mi 132 km〔|| mi2 1,313 km2〔|||| ft 123 m|||| ft 1,326 m||Source in Umatilla National Forest, mouth east of Wasco |-- ! scope="row" |Willow Creek |Columbia River|| mi 127 km|| mi2 2,279 km2〔|||| ft 82 m|||| ft 1,499 m ||Source in Umatilla National Forest, mouth upstream of Arlington |-- ! scope="row" |South Fork Crooked River |Crooked River|| mi 123 km〔|| mi2 4,000 km2|||| ft 1,104 m|||| ft 1,457 m||Source southeast of Brothers, mouth near Ochoco Mountains |-- ! scope="row" |Middle Fork John Day River |North Fork John Day River|| mi 121 km〔|| mi2 833 km2〔 |||| ft 670 m |||| ft 1,296 m || Source in Blue Mountains, mouth near Monument |-- ! scope="row" |Cow Creek |South Umpqua River|| mi 121 km〔 The maps include river mile markers for the lower of the river. The remaining distance is an estimate based on map scale and ruler.〕 || mi2 1,181 km2|||| ft 194 m|| || ft 733 m ||Source in Umpqua National Forest, mouth at Canyonville |-- ! scope="row" |Sycan River |Sprague River|| mi 121 km〔 || mi2 1,450 km2 |||| ft 1,314 m|||| ft 2,156 m ||Source on high plateau of eastern Klamath County, mouth at Beatty |-- ! scope="row" |Imnaha River |Snake River|| mi 117 km〔|| mi2 2,214 km2|||| ft 288 m|| || ft 2,024 m||Source in Wallowa Mountains, mouth on Idaho border |-- ! scope="row" |Calapooia River |Willamette River|| mi 116 km〔|| mi2 945 km2〔|||| ft 55 m || || ft 1,387 m ||Source in Cascade Range, mouth at Albany |-- ! scope="row" |Williamson River |Klamath River|| mi 110 km || mi2 7,800 km2|||| ft 1,264 m|| || ft 1,600 m ||Source on high plateau of eastern Klamath County, mouth at Upper Klamath Lake |-- ! scope="row" |Succor Creek |Snake River||style="background:#fffdd0;"| mi 108 km || mi2 1,279 km2〔(【引用サイトリンク】publisher=United States Geological Survey )〕|||| ft 674 m|||| ft 2,126 m||Source in Owyhee Mountains, mouth near Homedale, both in Idaho |-- ! scope="row" |Siletz River |Pacific Ocean|| mi 108 km〔 Map quadrants show river mileage from mouth to source.〕 || mi2 970 km2|||| ft 0 m|||| ft 216 m ||Source in Central Oregon Coast Range, mouth near Lincoln City |-- ! scope="row" |South Santiam River |Santiam River|| mi 106 km 〔 The map quadrants include river-mile markers for the stream's entire length.〕 || mi2 2,694 km2〔(【引用サイトリンク】 publisher = South Santiam Watershed Council )〕|| || ft 66 m || || ft 589 m ||Source in Cascade Range, mouth in Willamette Valley |-- ! scope="row" |South Fork Coquille River |Coquille River|| mi 101 km〔(【引用サイトリンク】url=http://www.coquillewatershed.org/Coquille_Facts.html )〕|| mi2 746 km2〔|||| ft 4 m|||| ft 1,058 m ||Source in Siskiyou National Forest, mouth near Myrtle Point |-- ! scope="row" |West Little Owyhee River |Owyhee River|| mi 101 km〔|| mi2 803 km2〔|||| ft 1,333 m|||| ft 1,984 m || Source near McDermitt, mouth in Owyhee Desert |-- ! scope="row" |Pudding River |Molalla River|| mi 100 km〔(【引用サイトリンク】United States Geological Survey Topographic Map ) The map quadrants include river-mile (RM) markers to RM 59 (river kilometer 95). The remaining distance is an estimate based on map scale and ruler.〕|| mi2 1,375 km2〔(【引用サイトリンク】 publisher = Pudding River Watershed Council )〕|||| ft 19 m |||| ft 290 m||Source in Waldo Hills, mouth near Canby |-- ! scope="row" |Luckiamute River |Willamette River|| mi 100 km〔 The map quadrants include river-mile (RM) markers to RM 52 (river kilometer 84). The remaining distance is an estimate based on map scale and ruler.〕|| mi2 816 km2|||| ft 50 m|||| ft 818 m||Source in Central Oregon Coast Range, mouth near Buena Vista |-- ! scope="row" |Bully Creek |Malheur River|| mi 99 km〔 || mi2 1,560 km2|||| ft 684 m |||| ft 1,304 m||Source in Malheur County, mouth near Vale |-- ! scope="row" |South Fork John Day River |John Day River|| mi 97 km〔|| mi2 1,570 km2 |||| ft 710 m|||| ft 1,600 m ||Source in Ochoco Mountains, mouth near Dayville |-- ! scope="row" |Lost River |Tule Lake||style="background:#fffdd0;"| mi 97 km〔 Map quadrants show river mileage from mouth to source.〕 || mi2 7,760 km2 |||| ft 1,230 m|| || ft 1,365 m ||Source at Clear Lake Reservoir, mouth at Tule Lake, both in California |-- ! scope="row" |Donner und Blitzen River |Malheur Lake|| mi 97 km|| mi2 2,050 km2|||| ft 1,250 m|| || ft 1989 m ||Source near Steens Mountain, mouth at Malheur Lake |-- ! scope="row" |South Yamhill River |Yamhill River|| mi 97 km〔 The map quadrants include river mile (RM) markers from the mouth to RM 55 (river kilometer 89), upstream of Grand Ronde, Oregon. The remaining distance is an estimate based on map scale and ruler.〕|| mi2 1,274 km2〔 The total is the sum of five subwatersheds: Upper Yamhill, Mill Creek, Salt Creek, Lower South Yamhill/Deer Creek, and Willamina Creek.〕 || || ft 23 m || || ft 168 m ||Source in Northern Oregon Coast Range, mouth near McMinnville |-- ! scope="row" |North Fork Malheur River |Malheur River|| mi 95 km || mi2 1,424 km2|||| ft 891 m|||| ft 2,098 m ||Source in Strawberry Range, mouth near Juntura |-- ! scope="row" |Yaquina River |Pacific Ocean|| mi 95 km|| mi2 660 km2〔 |||| ft 0 m|| || ft 651 m ||Source in Central Oregon Coast Range, mouth at Newport |-- ! scope="row" |Butter Creek |Umatilla River|| mi 92 km|| mi2 1,204 km2〔|||| ft 163 m|||| ft 1,534 m ||Source in Umatilla National Forest, mouth upstream of Hermiston |-- ! scope="row" |Rattlesnake Creek (intermittent) |Crooked Creek|| mi 92 km〔|| mi2 772 km2〔|||| ft 1,149 m|||| ft 1,963 m||Source in desert north of McDermitt, mouth near Burns Junction |-- ! scope="row" |Willow Creek |Malheur River|| mi 92 km〔 Reference states that Willow Creek is dammed from its mouth. The remaining distance is an estimate based on map scale and ruler.〕|| mi2 2,038 km2|||| ft 681 m|||| ft 1,135 m ||Source near Ironside, mouth near Vale |-- ! scope="row" |Chetco River |Pacific Ocean|| mi 90 km || mi2 912 km2〔 || || ft 0 m|||| ft 976 m ||Source in Klamath Mountains, mouth near Brookings |-- ! scope="row" |Illinois River |Rogue River|| mi 97 km〔 The distance between the source and the upstream boundary of the Wild and Scenic section, which begins at river mile (RM) 50.4 (river kilometer 81.1) and ends at the mouth, is an estimate based on map scale and ruler.〕 || mi2 2,546 km2〔 The document is Appendix E of the (Illinois Appendices ) in zipped PDF format.〕 || || ft 31 m|| || ft 389 m ||Source near Cave Junction (between Klamath Mountains and Siskiyou Mountains), mouth near Agness |-- ! scope="row" |Rock Creek (intermittent) |Catlow Valley|| mi 90 km〔|| mi2 697 km2〔|||| ft 1,389 m|||| ft 2,102 m||Source on Hart Mountain, mouth in Catlow Valley |-- ! scope="row" |Wallowa River |Grande Ronde River || mi 89 km〔 The map quadrants include river mile (RM) markers from the mouth to RM 50 (river kilometer 74.5). The remaining distance is an estimate based on map scale and ruler.〕|| mi2 2,480 km2 |||| ft 706 m|||| ft 1,371 m ||Source in Wallowa Mountains, mouth downstream of Wallowa |-- ! scope="row" |Sandy River |Columbia River|| mi 89 km|| mi2 1,316 km2〔|| || ft 3 m |||| ft 1,593 m ||Source in Cascade Range, mouth near Troutdale |-- ! scope="row" |Long Tom River |Willamette River|| mi 89 km|| mi2 1,062 km2|||| ft 78 m|||| ft 427 m||Source near Low Pass, mouth north of Monroe |-- ! scope="row" |Fifteenmile Creek |Columbia River|| mi 87 km〔|| mi2 966 km2|||| ft 29 m|||| ft 1,883 m||Source in Mount Hood National Forest, mouth near The Dalles |-- ! scope="row" |Dry Creek (intermittent) |Crooked Creek|| mi 86 km〔|| mi2 1,184 km2〔|||| ft 1,088 m|||| ft 1,524 m||Source near Five Points, mouth near Burns Junction |-- ! scope="row" |Nestucca River |Pacific Ocean|| mi 85 km〔 Map quadrangles show river mileage from the mouth to . The remaining distance is an estimate based on map scale and ruler.〕 || mi2 960 km2〔 Includes the watershed of the Little Nestucca River, which is a tributary of Nestucca Bay but not the Nestucca River main stem.〕|||| ft 0 m|||| ft 685 m ||Source in Northern Oregon Coast Range, mouth near Pacific City |-- ! scope="row" |Warm Springs River |Deschutes River|| mi 85 km〔|| mi2 1,401 km2〔|||| ft 378 m|||| ft 1,226 m||Source in Cascade Range, mouth near Kahneeta |-- ! scope="row" |North Fork Coquille River |Coquille River|| mi 85 km〔|| mi2 399 km2〔|||| ft 4 m|||| ft 502 m ||Source in central Coast Range, mouth near Myrtle Point |-- ! scope="row" |Chewaucan River |Abert Lake|| mi 86 km〔|| mi2 1,686 km2〔|||| ft 1,298 m|||| ft 1,570 m||Source in Fremont National Forest, mouth at Abert Lake |-- ! scope="row" |Applegate River |Rogue River||style="background:#fffdd0;"| mi 82 km〔 Map quadrants show river mileage from the mouth to river mile (RM) 46 or river kilometer (RK) 74 near the intake for Applegate Dam. The remaining distance is an estimate based on map scale and ruler.〕|| mi2 1,990 km2 |||| ft 259 m|||| ft 772 m || Source in Siskiyou Mountains in California, mouth near Grants Pass |-- ! scope="row" |Trout Creek |Deschutes River|| mi 82 km〔|| mi2 1,792 km2|||| ft 391 m|||| ft 1,705 m||Source in Ochoco Mountains, mouth at Jefferson–Wasco county line |-- ! scope="row" |Cow Creek |Jordan Creek||style="background:#fffdd0;"| mi 82 km〔 || mi2 855 km2〔(【引用サイトリンク】publisher=United States Geological Survey )〕|||| ft 1,285 m|||| ft 2,148 m||Source near De Lamar, Idaho, mouth at Danner |-- ! scope="row" |Crooked Creek |Owyhee River|| mi 82 km〔(【引用サイトリンク】url=http://gis-lab.info/qa/vmap0-eng.html )〕|| mi2 3,500 km2 |||| ft 1,019 m |||| ft 1,195 m||Source at Crooked Creek Spring, mouth near Rome |-- ! scope="row"|Minam River |Wallowa River|| mi 82 km〔|| mi2 618 km2 |||| ft 773 m|||| ft 2,342 m||Source in the Eagle Cap Wilderness, mouth at Minam |-- ! scope="row" |Molalla River |Willamette River|| mi 80 km〔 The map quadrants include river mile (RM) markers from the mouth to RM 46.3 (river kilometer 74.5). The remaining distance is an estimate based on map scale and ruler.〕|| mi2 2,270 km2〔 || || ft 21 m|||| ft 1,007 m ||Source in Cascade Range, mouth near Canby |-- ! scope="row" |Walla Walla River |Columbia River||style="background:#fffdd0;"| mi 80 km〔 The maps include river mile markers for the lower of the river. The remaining distance is an estimate based on map scale and ruler.〕 || mi2 4,453 km2〔 || || ft 123 m|||| ft 410 m ||Source near Milton-Freewater, mouth near Wallula, Washington |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of longest streams of Oregon」の詳細全文を読む スポンサード リンク
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