The Santiam River is a tributary of the Willamette River, about 12 miles (19 km) long, in western Oregon in the United States. Through its two principal tributaries, the North Santiam and the South Santiam rivers, it drains a large area of the Cascade Range at the eastern side of the Willamette Valley east of Salem and Corvallis.
The Owyhee River is a tributary of the Snake River located in northern Nevada, southwestern Idaho and southeastern Oregon in the United States. It is 280 miles (450 km) long. The river's drainage basin is 11,049 square miles (28,620 km2) in area, one of the largest subbasins of the Columbia Basin. The mean annual discharge is 995 cubic feet per second (28.2 m3/s), with a maximum of 50,000 cu ft/s (1,400 m3/s) recorded in 1993 and a minimum of 42 cu ft/s (1.2 m3/s) in 1954.
The South Santiam River is a tributary of the Santiam River, about 69 miles (111 km) long, in western Oregon in the United States. It drains an area of the Cascade Range into the Willamette Valley east of Corvallis.
The Clatskanie River is a tributary of the Columbia River, approximately 25 miles (40 km) long, in northwestern Oregon in the United States. It drains a timber-producing area in the foothills of the Northern Oregon Coast Range north-northwest of Portland.
The Burnt River is a 98-mile-long (158 km) tributary of the Snake River in eastern Oregon, United States. It enters the Snake near Huntington, Oregon, at a point upstream of the Powder River and downstream of the Malheur River, slightly more than 327 miles (526 km) from the Snake's confluence with the Columbia River. Draining 1,090 square miles (2,800 km2), it flows predominantly west to east.
Succor Creek is a 69.4-mile-long (111.7 km) tributary of the Snake River in the U.S. states of Idaho and Oregon. The creek begins in the Owyhee Mountains in Owyhee County, Idaho. After flowing for about 23 miles (37 km) in Idaho, Succor Creek enters Malheur County, Oregon, where it flows for 39 miles (63 km) before re-entering Idaho for its final 5 miles (8.0 km). It joins the Snake near Homedale, about 413 river miles (665 km) from the larger river's confluence with the Columbia River.
The North Fork Bull Run River is a tributary, about 6 miles (10 km) long, of the Bull Run River in the U.S. state of Oregon. Part of the system that provides drinking water to the city of Portland, it flows generally south through a protected part of the Mount Hood National Forest in Multnomah County. It joins the Bull Run River at Bull Run Reservoir 1.
West Little Owyhee River is a 63.1-mile-long (101.5 km) tributary of the Owyhee River in the U.S. state of Oregon. The source of the river is at an elevation of 6,508 feet (1,984 m) near McDermitt, while the mouth is at an elevation of 4,373 feet (1,333 m) in the Owyhee Desert. West Little Owyhee River has a 310-square-mile (800 km2) watershed.
Mosby Creek is a 21-mile (34 km) tributary of the Row River in Lane County, in the U.S. state of Oregon. It begins at the confluence of the east and west forks of the creek near the Calapooia Divide and the border with Douglas County. From its source it flows generally north-northwest to meet the river slightly east of Cottage Grove and about 4 miles (6 km) from the larger stream's confluence with the Coast Fork Willamette River.
The North Fork Owyhee River is a tributary, about 30 miles (48 km) long, of the Owyhee River in Malheur County, Oregon, and Owyhee County, Idaho, in the United States. It begins on the east flank of the Owyhee Mountains in Idaho and flows generally southwest to meet the main stem at Three Forks, Oregon, 161 miles (259 km) above the confluence of the larger river with the Snake River.
The Middle Fork Owyhee River is a tributary of the North Fork Owyhee River in Malheur County, Oregon, and Owyhee County, Idaho, in the United States. It forms along Juniper Mountain, south of the Owyhee Mountains in Idaho. From its headwaters, it flows southwest then curves northwest to and beyond the Idaho–Oregon border, then turns north to meet the North Fork at Three Forks, Oregon. The confluence is less than a mile upstream from the North Fork's confluence with the Owyhee River. Below Three Forks, the main stem Owyhee flows 161 miles (259 km) to empty into the Snake River.
The North Fork Siuslaw River is a tributary of the Siuslaw River in Lane County in the United States state of Oregon. It is formed by the confluence of Sam Creek and West Branch in the Siuslaw National Forest of the Central Oregon Coast Range. The former community of Pawn was once at the juncture of the two creeks. From here, the river flows about 2 miles (3 km) southeast, then about 25 miles (40 km) southwest to meet the main stem 1.2 miles (1.9 km) east of Florence.
The North Fork Umatilla River is a tributary of the Umatilla River in Union and Umatilla counties in the U.S. state of Oregon. Its headwaters lie in the Umatilla National Forest in the Blue Mountains of northeastern Oregon. It flows generally northwest to meet the South Fork Umatilla River near Graves Butte. Together the two forks form the main stem Umatilla.
The South Fork Umatilla River is a tributary of the Umatilla River in Umatilla County in the U.S. state of Oregon. Its headwaters lie in the Umatilla National Forest in the Blue Mountains of northeastern Oregon near Pileup Saddle and Black Mountain. The South Fork flows generally north between Goodman Ridge and Bobsled Ridge to meet the North Fork Umatilla River near Graves Butte. Together the forks form the main stem Umatilla.
The North Fork Smith River is a 34-mile (55 km) tributary of the Smith River in Douglas County in the U.S. state of Oregon. It begins in the Central Oregon Coast Range near Roman Nose Mountain and flows generally southwest to meet the larger river 16 miles (26 km) from its confluence with the Umpqua River at Reedsport. The entire course of the North Fork lies within the Siuslaw National Forest.
The West Fork Smith River is a tributary, about 10 miles (16 km) long, of the Smith River in Douglas County in the U.S. state of Oregon. It begins in the Central Oregon Coast Range near Roman Nose Mountain and flows generally south to meet the larger river 35 miles (56 km) from its confluence with the Umpqua River near Reedsport. The entire course of the river lies within the Siuslaw National Forest.
The South Fork Malheur River is tributary of the Malheur River in a sparsely populated part of the U.S. state of Oregon. Arising southeast of the unincorporated community of New Princeton and slightly north of Oregon Route 78, it flows generally northeast to meet the Malheur near the unincorporated community of Riverside in Malheur County. The South Fork enters the larger river 96 miles (154 km) by water from its confluence with the Snake River.
Deadwood Creek is a tributary of Lake Creek in the Siuslaw River basin in Lane County in the U.S. state of Oregon. Beginning near Taylor Butte in the Central Oregon Coast Range, it meanders generally southwest through the Siuslaw National Forest to meet the larger creek at the rural community of Deadwood. This is 5 miles (8 km) from Lake Creek's confluence with the river near Swisshome and 34 miles (55 km) by water from the Siuslaw River's mouth on the Pacific Ocean at Florence.
Horse Creek is a tributary of the McKenzie River in near the unincorporated community of McKenzie Bridge in Lane County in the U.S. state of Oregon. It begins in the Cascade Range in the Three Sisters Wilderness of the Willamette National Forest. Its headwaters are near the Deschutes County border and the Pacific Crest Trail. It flows generally northwest to meet the river about 65 miles (105 km) upstream of the McKenzie's confluence with the Willamette River.
