# List of longest streams of Oregon

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 1,078 miles (1,735 km) is the only other stream of more than 1,000 miles (1,600 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 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

* Sandy River, 63rd longest
* McKenzie River, 26th longest
* Columbia River, longest
* North Umpqua River, 18th longest
* Snake River, 2nd longest
* Nestucca River, 67th longest
* Key
* † Stream is not entirely within the state
Longest streams of Oregon :
| Name | Mouth | Total length | Watershed area | Mouth coordinates | Mouth elevation | Source coordinates | Source elevation | Source and mouth locations |
| Columbia River | Pacific Ocean | 1,249 mi 2,010 km† | 258,000 mi$^2$ 668,000 km$^2$ | 46°14′39″N 124°03′29″W﻿ / ﻿46.24417°N 124.05806°W﻿ / 46.24417; -124.05806﻿ (Columbia River (mouth)) | 0 ft 0 m | 50°13′00″N 115°51′00″W﻿ / ﻿50.21667°N 115.85000°W﻿ / 50.21667; -115.85000﻿ (Columbia River (source)) | 2,657 ft 810 m | Source at Columbia Lake, British Columbia, mouth near Astoria |
| Snake River | Columbia River | 1,078 mi 1,674 km† | 108,000 mi$^2$ 280,000 km$^2$ | 46°11′10″N 119°01′43″W﻿ / ﻿46.18611°N 119.02861°W﻿ / 46.18611; -119.02861﻿ (Snake River (mouth)) | 358 ft 109 m | 44°07′49″N 110°13′10″W﻿ / ﻿44.13028°N 110.21944°W﻿ / 44.13028; -110.21944﻿ (Snake River (source)) | 9,199 ft 2,804 m | Source in Absaroka Range, Wyoming, mouth near Tri-Cities, Washington |
| Owyhee River | Snake River | 346 mi 557 km† | 11,049 mi$^2$ 28,617 km$^2$ | 43°48′46″N 117°01′32″W﻿ / ﻿43.81278°N 117.02556°W﻿ / 43.81278; -117.02556﻿ (Owyhee River (mouth)) | 3,185 ft 666 m | 41°30′17″N 115°44′30″W﻿ / ﻿41.50472°N 115.74167°W﻿ / 41.50472; -115.74167﻿ (Owyhee River (source)) | 6,918 ft 2,109 m | Source in Independence Mountains of Nevada, mouth near Nyssa |
| Klamath River | Pacific Ocean | 287 mi 462 km† | 15,700 mi$^2$ 40,700 km$^2$ | 41°32′49″N 124°05′00″W﻿ / ﻿41.54694°N 124.08333°W﻿ / 41.54694; -124.08333﻿ (Klamath River (mouth)) | 0 ft 0 m | 42°11′29″N 121°46′58″W﻿ / ﻿42.19139°N 121.78278°W﻿ / 42.19139; -121.78278﻿ (Klamath River (source)) | 4,090 ft 1,247 m | Source at Upper Klamath Lake, mouth near Crescent City, California |
| John Day River | Columbia River | 284 mi 457 km | 7,880 mi$^2$ 20,400 km$^2$ | 45°43′57″N 120°38′57″W﻿ / ﻿45.73250°N 120.64917°W﻿ / 45.73250; -120.64917﻿ (John Day River (mouth)) | 269 ft 82 m | 44°14′44″N 118°33′08″W﻿ / ﻿44.24556°N 118.55222°W﻿ / 44.24556; -118.55222﻿ (John Day River (source)) | 6,676 ft 2,035 m | Source in Strawberry Range, mouth near Rufus |
| Deschutes River | Columbia River | 251 mi 405 km | 10,400 mi$^2$ 26,939 km$^2$ | 45°38′07″N 120°54′52″W﻿ / ﻿45.63528°N 120.91444°W﻿ / 45.63528; -120.91444﻿ (Deschutes River (mouth)) | 164 ft 50 m | 43°54′33″N 121°45′40″W﻿ / ﻿43.90917°N 121.76111°W﻿ / 43.90917; -121.76111﻿ (Deschutes River (source)) | 4,747 ft 1,447 m | Source in Cascade Range, mouth near Biggs Junction |
| Rogue River | Pacific Ocean | 216 mi 348 km | 5,159 mi$^2$ 13,360 km$^2$ | 42°25′21″N 124°25′45″W﻿ / ﻿42.42250°N 124.42917°W﻿ / 42.42250; -124.42917﻿ (Rogue River (mouth)) | 0 ft 0 m | 43°03′57″N 122°13′56″W﻿ / ﻿43.06583°N 122.23222°W﻿ / 43.06583; -122.23222﻿ (Rogue River (source)) | 5,320 ft 1,622 m | Source in Cascade Range, mouth near Gold Beach |
| Malheur River | Snake River | 190 mi 306 km | 4,703 mi$^2$ 12,180 km$^2$ | 44°03′33″N 116°58′31″W﻿ / ﻿44.05917°N 116.97528°W﻿ / 44.05917; -116.97528﻿ (Malheur River (mouth)) | 2,133 ft 650 m | 44°08′05″N 118°37′14″W﻿ / ﻿44.13472°N 118.62056°W﻿ / 44.13472; -118.62056﻿ (Malheur River (source)) | 4,958 ft 1,511 m | Source in Strawberry Range, mouth near Ontario |
| Willamette River | Columbia River | 187 mi 301 km | 11,400 mi$^2$ 30,000 km$^2$ | 45°39′10″N 122°45′53″W﻿ / ﻿45.65278°N 122.76472°W﻿ / 45.65278; -122.76472﻿ (Willamette River (mouth)) | 10 ft 3 m | 44°01′23″N 123°01′25″W﻿ / ﻿44.02306°N 123.02361°W﻿ / 44.02306; -123.02361﻿ (Willamette River (source)) | 438 ft 134 m | Source near Eugene, mouth near Portland |
| Grande Ronde River | Snake River | 182 mi 293 km† | 4,000 mi$^2$ 10,240 km$^2$ | 46°04′49″N 116°58′47″W﻿ / ﻿46.08028°N 116.97972°W﻿ / 46.08028; -116.97972﻿ (Grande Ronde River (mouth)) | 820 ft 250 m | 44°57′34″N 118°15′38″W﻿ / ﻿44.95944°N 118.26056°W﻿ / 44.95944; -118.26056﻿ (Grande Ronde River (source)) | 7,446 ft 2,270 m | Source in Blue Mountains, mouth on Washington–Idaho border |
| Powder River | Snake River | 153 mi 246 km | 1,603 mi$^2$ 4,150 km$^2$ | 44°44′37″N 117°02′56″W﻿ / ﻿44.74361°N 117.04889°W﻿ / 44.74361; -117.04889﻿ (Powder River (mouth)) | 2,064 ft 629 m | 44°44′30″N 118°12′22″W﻿ / ﻿44.74167°N 118.20611°W﻿ / 44.74167; -118.20611﻿ (Powder River (source)) | 4,402 ft 1,342 m | Source in Blue Mountains, mouth near Richland |
| Crooked River | Deschutes River | 125 mi 201 km | 4,300 mi$^2$ 11,137 km$^2$ | 44°34′25″N 121°16′19″W﻿ / ﻿44.57361°N 121.27194°W﻿ / 44.57361; -121.27194﻿ (Crooked River (mouth)) | 1,949 ft 594 m | 44°06′05″N 120°03′04″W﻿ / ﻿44.10139°N 120.05111°W﻿ / 44.10139; -120.05111﻿ (Crooked River (source)) | 3,624 ft 1,105 m | Source near Ochoco Mountains, mouth near Culver |
| Middle Fork Willamette River | Willamette River | 122 mi 196 km | 1,355 mi$^2$ 3,510 km$^2$ | 44°01′23″N 123°01′25″W﻿ / ﻿44.02306°N 123.02361°W﻿ / 44.02306; -123.02361﻿ (Middle Fork Willamette River (mouth)) | 436 ft 133 m | 43°24′28″N 122°06′20″W﻿ / ﻿43.40778°N 122.10556°W﻿ / 43.40778; -122.10556﻿ (Middle Fork Willamette River (source)) | 5,552 ft 1,692 m | Source in Calapooya Mountains, mouth near Springfield |
| Nehalem River | Pacific Ocean | 128 mi 206 km | 852 mi$^2$ 2,210 km$^2$ | 45°39′29″N 123°56′04″W﻿ / ﻿45.65806°N 123.93444°W﻿ / 45.65806; -123.93444﻿ (Nehalem River (mouth)) | 0 ft 0 m | 45°43′53″N 123°25′26″W﻿ / ﻿45.73139°N 123.42389°W﻿ / 45.73139; -123.42389﻿ (Nehalem River (source)) | 2,420 ft 740 m | Source in Northern Oregon Coast Range, mouth near Wheeler |
| Silvies River | Malheur Lake | 119 mi 192 km | 1,350 mi$^2$ 3,500 km$^2$ | 43°34′05″N 119°02′04″W﻿ / ﻿43.56806°N 119.03444°W﻿ / 43.56806; -119.03444﻿ (Silvies River (mouth)) | 4,150 ft 1,265 m | 44°07′19″N 119°13′53″W﻿ / ﻿44.12194°N 119.23139°W﻿ / 44.12194; -119.23139﻿ (Silvies River (source)) | 5,649 ft 1,722 m | Source in Blue Mountains, mouth near Burns |
| North Fork John Day River | John Day River | 117 mi 188 km | 600 mi$^2$ 1,554 km$^2$ | 44°45′22″N 119°38′19″W﻿ / ﻿44.75611°N 119.63861°W﻿ / 44.75611; -119.63861﻿ (North Fork John Day River (mouth)) | 1,834 ft 559 m | 44°51′48″N 118°14′13″W﻿ / ﻿44.86333°N 118.23694°W﻿ / 44.86333; -118.23694﻿ (North Fork John Day River (source)) | 7,420 ft 2,260 m | Source in Elkhorn Mountains, mouth near Kimberly |
| Umpqua River | Pacific Ocean | 112 mi 180 km | 4,668 mi$^2$ 12,133 km$^2$ | 43°40′09″N 124°12′18″W﻿ / ﻿43.66917°N 124.20500°W﻿ / 43.66917; -124.20500﻿ (Umpqua River (mouth)) | 0 ft 0 m | 43°16′05″N 123°26′46″W﻿ / ﻿43.26806°N 123.44611°W﻿ / 43.26806; -123.44611﻿ (Umpqua River (source)) | 362 ft 110 m | Source near Roseburg, mouth near Reedsport |
| Siuslaw River | Pacific Ocean | 110 mi 180 km | 773 mi$^2$ 2,000 km$^2$ | 44°01′01″N 124°08′14″W﻿ / ﻿44.01694°N 124.13722°W﻿ / 44.01694; -124.13722﻿ (Siuslaw River (mouth)) | 0 ft 0 m | 43°49′23″N 123°15′42″W﻿ / ﻿43.82306°N 123.26167°W﻿ / 43.82306; -123.26167﻿ (Siuslaw River (source)) | 632 ft 193 m | Source in Central Oregon Coast Range, mouth at Florence |
| North Umpqua River | Umpqua River | 110 mi 170 km | 1,356 mi$^2$ 3,510 km$^2$ | 43°16′05″N 123°26′45″W﻿ / ﻿43.26806°N 123.44583°W﻿ / 43.26806; -123.44583﻿ (North Umpqua River (mouth)) | 361 ft 110 m | 43°15′24″N 122°00′03″W﻿ / ﻿43.25667°N 122.00083°W﻿ / 43.25667; -122.00083﻿ (North Umpqua River (source)) | 5,985 ft 1,824 m | Source in Cascade Range, mouth near Roseburg |
| South Umpqua River | Umpqua River | 110 mi 170 km | 1,801 mi$^2$ 4,660 km$^2$ | 43°16′04″N 123°26′46″W﻿ / ﻿43.26778°N 123.44611°W﻿ / 43.26778; -123.44611﻿ (South Umpqua River (mouth)) | 361 ft 110 m | 43°06′26″N 122°35′22″W﻿ / ﻿43.10722°N 122.58944°W﻿ / 43.10722; -122.58944﻿ (South Umpqua River (source)) | 2,009 ft 612 m | Source in Cascade Range, mouth near Roseburg |
| Little Deschutes River | Deschutes River | 105 mi 169 km | 1,020 mi$^2$ 2,642 km$^2$ | 43°51′14″N 121°27′14″W﻿ / ﻿43.85389°N 121.45389°W﻿ / 43.85389; -121.45389﻿ (Little Deschutes River (mouth)) | 4,163 ft 1,269 m | 43°18′25″N 121°59′43″W﻿ / ﻿43.30694°N 121.99528°W﻿ / 43.30694; -121.99528﻿ (Little Deschutes River (source)) | 6,219 ft 1,896 m | Source in Cascade Range, mouth near Sunriver |
| Jordan Creek | Owyhee River | 99 mi 159 km† | 1,305 mi$^2$ 3,380 km$^2$ | 42°51′45″N 117°38′29″W﻿ / ﻿42.86250°N 117.64139°W﻿ / 42.86250; -117.64139﻿ (Jordan Creek (mouth)) | 3,363 ft 1,025 m | 42°58′21″N 116°44′39″W﻿ / ﻿42.97250°N 116.74417°W﻿ / 42.97250; -116.74417﻿ (Jordan Creek (source)) | 7,551 ft 2,302 m | Source in Owyhee Mountains of Idaho, mouth near Rome |
| Burnt River | Snake River | 98 mi 158 km | 1,041 mi$^2$ 2,700 km$^2$ | 44°21′54″N 117°13′34″W﻿ / ﻿44.36500°N 117.22611°W﻿ / 44.36500; -117.22611﻿ (Burnt River (mouth)) | 2,073 ft 632 m | 44°30′15″N 118°10′51″W﻿ / ﻿44.50417°N 118.18083°W﻿ / 44.50417; -118.18083﻿ (Burnt River (source)) | 3,824 ft 1,166 m | Source in Blue Mountains, mouth near Huntington |
| North Santiam River | Santiam River | 92 mi 148 km | 766 mi$^2$ 1,984 km$^2$ | 44°41′12″N 123°00′24″W﻿ / ﻿44.68667°N 123.00667°W﻿ / 44.68667; -123.00667﻿ (North Santiam River (mouth)) | 217 ft 66 m | 44°28′39″N 121°53′04″W﻿ / ﻿44.47750°N 121.88444°W﻿ / 44.47750; -121.88444﻿ (North Santiam River (source)) | 5,133 ft 1,565 m | Source in Cascade Range, mouth in Willamette Valley |
| Smith River | Umpqua River | 91 mi 146 km | 352 mi$^2$ 910 km$^2$ | 43°44′13″N 124°04′43″W﻿ / ﻿43.73694°N 124.07861°W﻿ / 43.73694; -124.07861﻿ (Smith River (mouth)) | 0 mi 0 km | 43°44′25″N 123°20′22″W﻿ / ﻿43.74028°N 123.33944°W﻿ / 43.74028; -123.33944﻿ (Smith River (source)) | 1,406 ft 429 m | Source in Central Oregon Coast Range, mouth near Reedsport |
| Umatilla River | Columbia River | 89 mi 143 km | 2,328 mi$^2$ 6,030 km$^2$ | 45°55′09″N 119°21′20″W﻿ / ﻿45.91917°N 119.35556°W﻿ / 45.91917; -119.35556﻿ (Umatilla River (mouth)) | 269 ft 82 m | 45°43′32″N 118°11′17″W﻿ / ﻿45.72556°N 118.18806°W﻿ / 45.72556; -118.18806﻿ (Umatilla River (source)) | 2,332 ft 711 m | Source in Blue Mountains, mouth at Umatilla |
| Dry River (intermittent) | Crooked River | 88 mi 142 km | 752 mi$^2$ 1,948 km$^2$ | 44°20′10″N 121°02′50″W﻿ / ﻿44.33611°N 121.04722°W﻿ / 44.33611; -121.04722﻿ (Dry River (mouth)) | 2,782 ft 848 m | 43°46′56″N 120°16′44″W﻿ / ﻿43.78222°N 120.27889°W﻿ / 43.78222; -120.27889﻿ (Dry River (source)) | 5,886 ft 1,794 m | Source in Hampton Buttes near Brothers, mouth upstream of Smith Rock |
| McKenzie River | Willamette River | 88 mi 142 km | 1,216 mi$^2$ 3,150 km$^2$ | 44°07′32″N 123°06′20″W﻿ / ﻿44.12556°N 123.10556°W﻿ / 44.12556; -123.10556﻿ (McKenzie River (mouth)) | 371 ft 113 m | 44°21′37″N 121°59′39″W﻿ / ﻿44.36028°N 121.99417°W﻿ / 44.36028; -121.99417﻿ (McKenzie River (source)) | 3,570 ft 1,088 m | Source in Cascade Range, mouth near Eugene |
| Silver Creek | Harney Lake | 87 mi 140 km | 1,700 mi$^2$ 4,403 km$^2$ | 43°15′47″N 119°11′21″W﻿ / ﻿43.26306°N 119.18917°W﻿ / 43.26306; -119.18917﻿ (Silver Creek (mouth)) | 4,101 ft 1,250 m | 43°56′28″N 119°33′25″W﻿ / ﻿43.94111°N 119.55694°W﻿ / 43.94111; -119.55694﻿ (Silver Creek (source)) | 5,830 ft 1,777 m | Source in Malheur National Forest, mouth at Harney Lake |
| Sprague River | Williamson River | 84 mi 135 km | 1,560 mi$^2$ 4,050 km$^2$ | 42°34′16″N 121°52′28″W﻿ / ﻿42.57111°N 121.87444°W﻿ / 42.57111; -121.87444﻿ (Sprague River (mouth)) | 4,163 ft 1,269 m | 42°26′16″N 121°06′34″W﻿ / ﻿42.43778°N 121.10944°W﻿ / 42.43778; -121.10944﻿ (Sprague River (source)) | 4,326 ft 1,319 m | Source on high plateau of eastern Klamath County, mouth near Chiloquin |
| Clackamas River | Willamette River | 83 mi 134 km | 940 mi$^2$ 2,435 km$^2$ | 45°22′21″N 122°36′31″W﻿ / ﻿45.37250°N 122.60861°W﻿ / 45.37250; -122.60861﻿ (Clackamas River (mouth)) | 10 ft 3 m | 44°49′17″N 121°47′47″W﻿ / ﻿44.82139°N 121.79639°W﻿ / 44.82139; -121.79639﻿ (Clackamas River (source)) | 4,904 ft 1,496 m | Source in Cascade Range, mouth at Gladstone and Oregon City |
| Tualatin River | Willamette River | 83 mi 134 km | 712 mi$^2$ 1,844 km$^2$ | 45°20′17″N 122°39′05″W﻿ / ﻿45.33806°N 122.65139°W﻿ / 45.33806; -122.65139﻿ (Tualatin River (mouth)) | 59 ft 18 m | 45°28′55″N 123°24′21″W﻿ / ﻿45.48194°N 123.40583°W﻿ / 45.48194; -123.40583﻿ (Tualatin River (source)) | 1,978 ft 603 m | Source in Northern Oregon Coast Range, mouth near West Linn |
| Rock Creek | John Day River | 82 mi 132 km | 507 mi$^2$ 1,313 km$^2$ | 45°34′36″N 120°24′17″W﻿ / ﻿45.57667°N 120.40472°W﻿ / 45.57667; -120.40472﻿ (Rock Creek (John Day; mouth)) | 404 ft 123 m | 45°02′00″N 119°34′35″W﻿ / ﻿45.03333°N 119.57639°W﻿ / 45.03333; -119.57639﻿ (Rock Creek (John Day; source)) | 4,351 ft 1,326 m | Source in Umatilla National Forest, mouth east of Wasco |
| Willow Creek | Columbia River | 79 mi 127 km | 880 mi$^2$ 2,279 km$^2$ | 45°48′21″N 120°00′24″W﻿ / ﻿45.80583°N 120.00667°W﻿ / 45.80583; -120.00667﻿ (Willow Creek (Columbia River; mouth)) | 269 ft 82 m | 45°09′56″N 119°20′29″W﻿ / ﻿45.16556°N 119.34139°W﻿ / 45.16556; -119.34139﻿ (Willow Creek (Columbia River; source)) | 4,918 ft 1,499 m | Source in Umatilla National Forest, mouth upstream of Arlington |
| Donner und Blitzen River | Malheur Lake | 78 mi 126 km | 618 mi$^2$ 1,600 km$^2$ | 43°17′30″N 118°49′12″W﻿ / ﻿43.29167°N 118.82000°W﻿ / 43.29167; -118.82000﻿ (Donner und Blitzen River (mouth)) | 4,101 ft 1,250 m | 42°32′02″N 118°43′52″W﻿ / ﻿42.53389°N 118.73111°W﻿ / 42.53389; -118.73111﻿ (Donner und Blitzen (source)) | 6,526 ft 1989 m | Source near Steens Mountain, mouth at Malheur Lake |
| South Fork Crooked River | Crooked River | 76 mi 123 km | 1,530 mi$^2$ 4,000 km$^2$ | 44°06′05″N 120°03′04″W﻿ / ﻿44.10139°N 120.05111°W﻿ / 44.10139; -120.05111﻿ (SF Crooked River (mouth)) | 3,622 ft 1,104 m | 43°38′55″N 120°23′40″W﻿ / ﻿43.64861°N 120.39444°W﻿ / 43.64861; -120.39444﻿ (SF Crooked River (source)) | 4,779 ft 1,457 m | Source southeast of Brothers, mouth near Ochoco Mountains |
| Middle Fork John Day River | North Fork John Day River | 75 mi 121 km | 321 mi$^2$ 833 km$^2$ | 44°54′59″N 119°18′08″W﻿ / ﻿44.91639°N 119.30222°W﻿ / 44.91639; -119.30222﻿ (Middle Fork John Day River (mouth)) | 2,198 ft 670 m | 44°35′05″N 118°25′48″W﻿ / ﻿44.58472°N 118.43000°W﻿ / 44.58472; -118.43000﻿ (Middle Fork John Day River (source)) | 4,253 ft 1,296 m | Source in Blue Mountains, mouth near Monument |
| Cow Creek | South Umpqua River | 75 mi 121 km | 456 mi$^2$ 1,181 km$^2$ | 42°56′49″N 123°20′16″W﻿ / ﻿42.94694°N 123.33778°W﻿ / 42.94694; -123.33778﻿ (Cow Creek (mouth)) | 636 ft 194 m | 42°48′09″N 122°59′30″W﻿ / ﻿42.80250°N 122.99167°W﻿ / 42.80250; -122.99167﻿ (Cow Creek (source)) | 2,404 ft 733 m | Source in Umpqua National Forest, mouth at Canyonville |
| Sycan River | Sprague River | 75 mi 121 km | 557 mi$^2$ 1,440 km$^2$ | 42°27′40″N 121°17′13″W﻿ / ﻿42.46111°N 121.28694°W﻿ / 42.46111; -121.28694﻿ (Sycan River (mouth)) | 4,311 ft 1,314 m | 42°38′50″N 120°44′08″W﻿ / ﻿42.64722°N 120.73556°W﻿ / 42.64722; -120.73556﻿ (Sycan River (source)) | 7,075 ft 2,156 m | Source on high plateau of eastern Klamath County, mouth at Beatty |
| Imnaha River | Snake River | 73 mi 117 km | 851 mi$^2$ 2,2004 km$^2$ | 45°49′03″N 116°45′53″W﻿ / ﻿45.81750°N 116.76472°W﻿ / 45.81750; -116.76472﻿ (Imnaha River (mouth)) | 945 ft 288 m | 45°06′47″N 117°07′31″W﻿ / ﻿45.11306°N 117.12528°W﻿ / 45.11306; -117.12528﻿ (Imnaha River (source)) | 6,641 ft 2,024 m | Source in Wallowa Mountains, mouth on Idaho border |
| Calapooia River | Willamette River | 72 mi 116 km | 365 mi$^2$ 945 km$^2$ | 44°38′20″N 123°06′36″W﻿ / ﻿44.63889°N 123.11000°W﻿ / 44.63889; -123.11000﻿ (Calapooia River (mouth)) | 180 ft 55 m | 44°15′54″N 122°19′25″W﻿ / ﻿44.26500°N 122.32361°W﻿ / 44.26500; -122.32361﻿ (Calapooia River (source)) | 4,552 ft 1,387 m | Source in Cascade Range, mouth at Albany |
| Williamson River | Klamath River | 70 mi 110 km | 3,000 mi$^2$ 7,800 km$^2$ | 42°27′53″N 121°57′25″W﻿ / ﻿42.46472°N 121.95694°W﻿ / 42.46472; -121.95694﻿ (Williamson River (mouth)) | 4,147 ft 1,264 m | 42°42′15″N 121°20′24″W﻿ / ﻿42.70417°N 121.34000°W﻿ / 42.70417; -121.34000﻿ (Williamson River (source)) | 5,100 ft 1,600 m | Source on high plateau of eastern Klamath County, mouth at Upper Klamath Lake |
| Siletz River | Pacific Ocean | 69 mi 111 km | 304 mi$^2$ 790 km$^2$ | 44°54′12″N 124°00′41″W﻿ / ﻿44.90333°N 124.01139°W﻿ / 44.90333; -124.01139﻿ (Siletz River (mouth)) | 0 ft 0 m | 44°52′48″N 123°42′40″W﻿ / ﻿44.88000°N 123.71111°W﻿ / 44.88000; -123.71111﻿ (Siletz River (source)) | 708 ft 216 m | Source in Central Oregon Coast Range, mouth near Lincoln City |
| Succor Creek | Snake River | 67 mi 108 km† | 494 mi$^2$ 1,279 km$^2$ | 43°37′55″N 116°56′47″W﻿ / ﻿43.63194°N 116.94639°W﻿ / 43.63194; -116.94639﻿ (Succor Creek (mouth)) | 2,211 ft 674 m | 43°05′45″N 116°50′18″W﻿ / ﻿43.09583°N 116.83833°W﻿ / 43.09583; -116.83833﻿ (Succor Creek (source)) | 6,976 ft 2,126 m | Source in Owyhee Mountains, mouth near Homedale, both in Idaho |
| South Santiam River | Santiam River | 66 mi 106 km | 1,040 mi$^2$ 2,694 km$^2$ | 44°41′12″N 123°00′24″W﻿ / ﻿44.68667°N 123.00667°W﻿ / 44.68667; -123.00667﻿ (South Santiam River (mouth)) | 217 ft 66 m | 44°22′27″N 122°13′05″W﻿ / ﻿44.37417°N 122.21806°W﻿ / 44.37417; -122.21806﻿ (South Santiam River (source)) | 1,932 ft 589 m | Source in Cascade Range, mouth in Willamette Valley |
| Pudding River | Molalla River | 64 mi 103 km | 527 mi$^2$ 1,360 km$^2$ | 45°17′54″N 122°43′07″W﻿ / ﻿45.29833°N 122.71861°W﻿ / 45.29833; -122.71861﻿ (Pudding River (mouth)) | 69 ft 21 m | 44°53′51″N 122°44′42″W﻿ / ﻿44.89750°N 122.74500°W﻿ / 44.89750; -122.74500﻿ (Pudding River (source)) | 950 ft 290 m | Source in Waldo Hills, mouth near Canby |
| South Fork Coquille River | Coquille River | 63 mi 101 km | 288 mi$^2$ 746 km$^2$ | 43°04′49″N 124°08′29″W﻿ / ﻿43.08028°N 124.14139°W﻿ / 43.08028; -124.14139﻿ (South Fork Coquille River (mouth)) | 13 ft 4 m | 42°50′24″N 123°52′30″W﻿ / ﻿42.84000°N 123.87500°W﻿ / 42.84000; -123.87500﻿ (South Fork Coquille River (source)) | 3,472 ft 1,058 m | Source in Siskiyou National Forest, mouth near Myrtle Point |
| West Little Owyhee River | Owyhee River | 63 mi 101 km | 310 mi$^2$ 803 km$^2$ | 42°27′10″N 117°12′34″W﻿ / ﻿42.45278°N 117.20944°W﻿ / 42.45278; -117.20944﻿ (West Little Owyhee River (mouth)) | 4,373 ft 1,333 m | 42°06′30″N 117°35′03″W﻿ / ﻿42.10833°N 117.58417°W﻿ / 42.10833; -117.58417﻿ (West Little Owyhee River (source)) | 6,508 ft 1,984 m | Source near McDermitt, mouth in Owyhee Desert |
| Bully Creek | Malheur River | 62 mi 99 km | 540 mi$^2$ 1,560 km$^2$ | 43°58′30″N 117°14′24″W﻿ / ﻿43.97500°N 117.24000°W﻿ / 43.97500; -117.24000﻿ (Bully Creek (mouth)) | 2,244 ft 684 m | 44°05′25″N 118°05′55″W﻿ / ﻿44.09028°N 118.09861°W﻿ / 44.09028; -118.09861﻿ (Bully Creek (source)) | 4,278 ft 1,304 m | Source in Malheur County, mouth near Vale |
| Luckiamute River | Willamette River | 61 mi 98 km | 315 mi$^2$ 816 km$^2$ | 44°45′15″N 123°08′54″W﻿ / ﻿44.75417°N 123.14833°W﻿ / 44.75417; -123.14833﻿ (Luckiamute River (mouth)) | 164 ft 50 m | 44°47′28″N 123°32′45″W﻿ / ﻿44.79111°N 123.54583°W﻿ / 44.79111; -123.54583﻿ (Luckiamute River (source)) | 2,684 ft 818 m | Source in Central Oregon Coast Range, mouth near Buena Vista |
| South Fork John Day River | John Day River | 60 mi 97 km | 607 mi$^2$ 1,570 km$^2$ | 44°28′26″N 119°32′10″W﻿ / ﻿44.47389°N 119.53611°W﻿ / 44.47389; -119.53611﻿ (South Fork John Day River (mouth)) | 2,329 ft 710 m | 43°55′09″N 119°19′17″W﻿ / ﻿43.91917°N 119.32139°W﻿ / 43.91917; -119.32139﻿ (South Fork John Day River (source)) | 5,400 ft 1,600 m | Source in Ochoco Mountains, mouth near Dayville |
| Lost River | Tule Lake | 60 mi 97 km† | 2,998 mi$^2$ 7,760 km$^2$ | 41°56′24″N 121°30′19″W﻿ / ﻿41.94000°N 121.50528°W﻿ / 41.94000; -121.50528﻿ (Lost River (mouth)) | 4,035 ft 1,230 m | 41°55′34″N 121°04′33″W﻿ / ﻿41.92611°N 121.07583°W﻿ / 41.92611; -121.07583﻿ (Lost River (source)) | 4,479 ft 1,365 m | Source at Clear Lake Reservoir, mouth at Tule Lake, both in California |
| South Yamhill River | Yamhill River | 60 mi 97 km | 492 mi$^2$ 1,274 km$^2$ | 45°13′33″N 123°08′41″W﻿ / ﻿45.22583°N 123.14472°W﻿ / 45.22583; -123.14472﻿ (South Yamhill River (mouth)) | 75 ft 23 m | 45°06′38″N 123°43′40″W﻿ / ﻿45.11056°N 123.72778°W﻿ / 45.11056; -123.72778﻿ (South Yamhill River (source)) | 551 ft 168 m | Source in Northern Oregon Coast Range, mouth near McMinnville |
| North Fork Malheur River | Malheur River | 59 mi 95 km | 550 mi$^2$ 1,424 km$^2$ | 43°45′25″N 118°03′40″W﻿ / ﻿43.75694°N 118.06111°W﻿ / 43.75694; -118.06111﻿ (NF Malheur River (mouth)) | 2,923 ft 891 m | 44°21′58″N 118°24′16″W﻿ / ﻿44.36611°N 118.40444°W﻿ / 44.36611; -118.40444﻿ (NF Malheur River (source)) | 6,884 ft 2,098 m | Source in Strawberry Range, mouth near Juntura |
| Yaquina River | Pacific Ocean | 59 mi 95 km | 253 mi$^2$ 660 km$^2$ | 44°36′44″N 124°01′04″W﻿ / ﻿44.61222°N 124.01778°W﻿ / 44.61222; -124.01778﻿ (Yaquina River (mouth)) | 0 ft 0 m | 44°44′57″N 123°36′06″W﻿ / ﻿44.74917°N 123.60167°W﻿ / 44.74917; -123.60167﻿ (Yaquina River (source)) | 2,137 ft 651 m | Source in Central Oregon Coast Range, mouth at Newport |
| Butter Creek | Umatilla River | 57 mi 92 km | 465 mi$^2$ 1,204 km$^2$ | 45°47′41″N 119°19′44″W﻿ / ﻿45.79472°N 119.32889°W﻿ / 45.79472; -119.32889﻿ (Butter Creek (mouth)) | 535 ft 163 m | 45°12′24″N 119°10′25″W﻿ / ﻿45.20667°N 119.17361°W﻿ / 45.20667; -119.17361﻿ (Butter Creek (source)) | 5,034 ft 1,534 m | Source in Umatilla National Forest, mouth upstream of Hermiston |
| Rattlesnake Creek (intermittent) | Crooked Creek | 57 mi 92 km | 298 mi$^2$ 772 km$^2$ | 42°43′24″N 117°47′42″W﻿ / ﻿42.72333°N 117.79500°W﻿ / 42.72333; -117.79500﻿ (Rattlesnake Creek (mouth)) | 3,770 ft 1,149 m | 42°16′55″N 117°40′10″W﻿ / ﻿42.28194°N 117.66944°W﻿ / 42.28194; -117.66944﻿ (Rattlesnake Creek (source)) | 6,439 ft 1,963 m | Source in desert north of McDermitt, mouth near Burns Junction |
| Willow Creek | Malheur River | 57 mi 92 km | 787 mi$^2$ 2,038 km$^2$ | 43°59′14″N 117°13′51″W﻿ / ﻿43.98722°N 117.23083°W﻿ / 43.98722; -117.23083﻿ (Willow Creek (Malheur River; mouth)) | 2,234 ft 681 m | 44°20′08″N 117°56′15″W﻿ / ﻿44.33556°N 117.93750°W﻿ / 44.33556; -117.93750﻿ (Willow Creek (Malheur River; source)) | 3,724 ft 1,135 m | Source near Ironside, mouth near Vale |
| Chetco River | Pacific Ocean | 56 mi 90 km | 352 mi$^2$ 912 km$^2$ | 42°02′43″N 124°16′14″W﻿ / ﻿42.04528°N 124.27056°W﻿ / 42.04528; -124.27056﻿ (Chetco River (mouth)) | 0 ft 0 m | 42°07′47″N 123°52′39″W﻿ / ﻿42.12972°N 123.87750°W﻿ / 42.12972; -123.87750﻿ (Chetco River (source)) | 3,201 ft 976 m | Source in Klamath Mountains, mouth near Brookings |
| Illinois River | Rogue River | 56 mi 97 km | 990 mi$^2$ 2,600 km$^2$ | 42°33′00″N 124°03′58″W﻿ / ﻿42.55000°N 124.06611°W﻿ / 42.55000; -124.06611﻿ (Illinois River (mouth)) | 102 ft 31 m | 42°09′35″N 123°39′33″W﻿ / ﻿42.15972°N 123.65917°W﻿ / 42.15972; -123.65917﻿ (Illinois River (source)) | 1,275 ft 389 m | Source near Cave Junction (between Klamath Mountains and Siskiyou Mountains), mouth near Agness |
| Rock Creek (intermittent) | Catlow Valley | 56 mi 90 km | 269 mi$^2$ 697 km$^2$ | 42°39′41″N 119°10′08″W﻿ / ﻿42.66139°N 119.16889°W﻿ / 42.66139; -119.16889﻿ (Rock Creek (Catlow Valley; mouth)) | 4,557 ft 1,389 m | 42°26′57″N 119°41′33″W﻿ / ﻿42.44917°N 119.69250°W﻿ / 42.44917; -119.69250﻿ (Rock Creek (Catlow Valley; source)) | 6,896 ft 2,102 m | Source on Hart Mountain, mouth in Catlow Valley |
| Wallowa River | Grande Ronde River | 56 mi 90 km | 927 mi$^2$ 2,400 km$^2$ | 45°43′31″N 117°47′09″W﻿ / ﻿45.72528°N 117.78583°W﻿ / 45.72528; -117.78583﻿ (Wallowa River (mouth)) | 2,316 ft 706 m | 45°16′28″N 117°12′42″W﻿ / ﻿45.27444°N 117.21167°W﻿ / 45.27444; -117.21167﻿ (Wallowa River (source)) | 4,498 ft 1,371 m | Source in Wallowa Mountains, mouth downstream of Wallowa |
| Sandy River | Columbia River | 55 mi 89 km | 508 mi$^2$ 1,316 km$^2$ | 45°34′05″N 122°24′03″W﻿ / ﻿45.56806°N 122.40083°W﻿ / 45.56806; -122.40083﻿ (Sandy River (mouth)) | 10 ft 3 m | 45°22′32″N 121°43′45″W﻿ / ﻿45.37556°N 121.72917°W﻿ / 45.37556; -121.72917﻿ (Sandy River (source)) | 5,225 ft 1,593 m | Source in Cascade Range, mouth near Troutdale |
| Long Tom River | Willamette River | 55 mi 89 km | 410 mi$^2$ 1,062 km$^2$ | 44°22′48″N 123°14′54″W﻿ / ﻿44.38000°N 123.24833°W﻿ / 44.38000; -123.24833﻿ (Long Tom River (mouth)) | 256 ft 78 m | 44°13′12″N 123°26′39″W﻿ / ﻿44.22000°N 123.44417°W﻿ / 44.22000; -123.44417﻿ (Long Tom River (source)) | 1,400 ft 427 m | Source near Low Pass, mouth north of Monroe |
| Fifteenmile Creek | Columbia River | 54 mi 87 km | 370 mi$^2$ 960 km$^2$ | 45°36′50″N 121°07′22″W﻿ / ﻿45.61389°N 121.12278°W﻿ / 45.61389; -121.12278﻿ (Fifteenmile Creek (mouth)) | 95 ft 29 m | 45°20′35″N 121°31′18″W﻿ / ﻿45.34306°N 121.52167°W﻿ / 45.34306; -121.52167﻿ (Fifteenmile Creek (source)) | 6,178 ft 1,883 m | Source in Mount Hood National Forest, mouth near The Dalles |
| Dry Creek (intermittent) | Crooked Creek | 54 mi 86 km | 499 mi$^2$ 1,184 km$^2$ | 42°47′42″N 117°44′47″W﻿ / ﻿42.79500°N 117.74639°W﻿ / 42.79500; -117.74639﻿ (Dry Creek (mouth)) | 3,570 ft 1,088 m | 42°30′31″N 117°17′44″W﻿ / ﻿42.50861°N 117.29556°W﻿ / 42.50861; -117.29556﻿ (Dry Creek (source)) | 5,000 ft 1,524 m | Source near Five Points, mouth near Burns Junction |
| Nestucca River | Pacific Ocean | 53 mi 85 km | 370 mi$^2$ 960 km$^2$ | 45°11′03″N 123°57′26″W﻿ / ﻿45.18417°N 123.95722°W﻿ / 45.18417; -123.95722﻿ (Nestucca River (mouth)) | 0 ft 0 m | 45°16′23″N 123°23′33″W﻿ / ﻿45.27306°N 123.39250°W﻿ / 45.27306; -123.39250﻿ (Nestucca River (source)) | 2,246 ft 685 m | Source in Northern Oregon Coast Range, mouth near Pacific City |
| Warm Springs River | Deschutes River | 53 mi 85 km | 541 mi$^2$ 1,401 km$^2$ | 44°51′28″N 121°04′09″W﻿ / ﻿44.85778°N 121.06917°W﻿ / 44.85778; -121.06917﻿ (Warm Springs River (mouth)) | 1,240 ft 378 m | 44°57′39″N 121°47′21″W﻿ / ﻿44.96083°N 121.78917°W﻿ / 44.96083; -121.78917﻿ (Warm Springs River (source)) | 4,023 ft 1,226 m | Source in Cascade Range, mouth near Kahneeta |
| North Fork Coquille River | Coquille River | 53 mi 85 km | 154 mi$^2$ 399 km$^2$ | 43°04′49″N 124°08′29″W﻿ / ﻿43.08028°N 124.14139°W﻿ / 43.08028; -124.14139﻿ (North Fork Coquille River (mouth)) | 13 ft 4 m | 43°16′54″N 123°51′14″W﻿ / ﻿43.28167°N 123.85389°W﻿ / 43.28167; -123.85389﻿ (North Fork Coquille River (source)) | 1,647 ft 502 m | Source in central Coast Range, mouth near Myrtle Point |
| Chewaucan River | Abert Lake | 53 mi 86 km | 651 mi$^2$ 1,686 km$^2$ | 42°31′21″N 120°14′59″W﻿ / ﻿42.52250°N 120.24972°W﻿ / 42.52250; -120.24972﻿ (Chewaucan River (mouth)) | 4,258 ft 1,298 m | 42°27′49″N 120°36′38″W﻿ / ﻿42.46361°N 120.61056°W﻿ / 42.46361; -120.61056﻿ (Chewaucan River (source)) | 5,151 ft 1,570 m | Source in Fremont National Forest, mouth at Abert Lake |
| Applegate River | Rogue River | 51 mi 82 km† | 767 mi$^2$ 1,990 km$^2$ | 42°25′44″N 123°26′59″W﻿ / ﻿42.42889°N 123.44972°W﻿ / 42.42889; -123.44972﻿ (Applegate River (mouth)) | 850 ft 259 m | 41°58′23″N 123°11′08″W﻿ / ﻿41.97306°N 123.18556°W﻿ / 41.97306; -123.18556﻿ (Applegate River (source)) | 2,534 ft 772 m | Source in Siskiyou Mountains in California, mouth near Grants Pass |
| Trout Creek | Deschutes River | 51 mi 82 km | 692 mi$^2$ 1,792 km$^2$ | 44°49′17″N 121°05′19″W﻿ / ﻿44.82139°N 121.08861°W﻿ / 44.82139; -121.08861﻿ (Trout Creek (mouth)) | 1,283 ft 391 m | 44°30′42″N 120°33′20″W﻿ / ﻿44.51167°N 120.55556°W﻿ / 44.51167; -120.55556﻿ (Trout Creek (source)) | 5,593 ft 1,705 m | Source in Ochoco Mountains, mouth at Jefferson–Wasco county line |
| Cow Creek | Jordan Creek | 51 mi 82 km† | 330 mi$^2$ 855 km$^2$ | 42°56′51″N 117°20′38″W﻿ / ﻿42.94750°N 117.34389°W﻿ / 42.94750; -117.34389﻿ (Cow Creek (Jordan Creek; mouth)) | 4,216 ft 1,285 m | 43°04′23″N 116°50′23″W﻿ / ﻿43.07306°N 116.83972°W﻿ / 43.07306; -116.83972﻿ (Cow Creek (Jordan Creek; source)) | 7,048 ft 2,148 m | Source near De Lamar, Idaho, mouth at Danner |
| Crooked Creek | Owyhee River | 51 mi 82 km | 1,340 mi$^2$ 3,500 km$^2$ | 42°52′57″N 117°41′52″W﻿ / ﻿42.88250°N 117.69778°W﻿ / 42.88250; -117.69778﻿ (Crooked Creek (mouth)) | 3,343 ft 1,019 m | 42°40′32″N 117°54′33″W﻿ / ﻿42.67556°N 117.90917°W﻿ / 42.67556; -117.90917﻿ (Crooked Creek (source)) | 3,921 ft 1,195 m | Source at Crooked Creek Spring, mouth near Rome |
| Minam River | Wallowa River | 51 mi 82 km | 239 mi$^2$ 618 km$^2$ | 45°37′17″N 117°43′14″W﻿ / ﻿45.62139°N 117.72056°W﻿ / 45.62139; -117.72056﻿ (Minam River (mouth)) | 2,536 ft 773 m | 45°10′07″N 117°21′28″W﻿ / ﻿45.16861°N 117.35778°W﻿ / 45.16861; -117.35778﻿ (Minam River (source)) | 7,684 ft 2,342 m | Source in the Eagle Cap Wilderness, mouth at Minam |
| Molalla River | Willamette River | 50 mi 80 km | 877 mi$^2$ 2,270 km$^2$ | 45°17′23″N 122°43′18″W﻿ / ﻿45.28972°N 122.72167°W﻿ / 45.28972; -122.72167﻿ (Molalla River (mouth)) | 69 ft 21 m | 44°54′12″N 122°16′01″W﻿ / ﻿44.90333°N 122.26694°W﻿ / 44.90333; -122.26694﻿ (Molalla River (source)) | 3,304 ft 1,007 m | Source in Cascade Range, mouth near Canby |
| Walla Walla River | Columbia River | 50 mi 80 km† | 1,758 mi$^2$ 4,453 km$^2$ | 46°03′27″N 118°54′40″W﻿ / ﻿46.05750°N 118.91111°W﻿ / 46.05750; -118.91111﻿ (Walla Walla River (mouth)) | 404 ft 123 m | 45°53′54″N 118°18′28″W﻿ / ﻿45.89833°N 118.30778°W﻿ / 45.89833; -118.30778﻿ (Walla Walla River (source)) | 1,360 ft 410 m | Source near Milton-Freewater, mouth near Wallula, Washington |