The Sprague River is a tributary of the Williamson River

Williamson River (Oregon)

The Williamson River of south-central Oregon in the United States is about long. It drains about east of the Cascade Range. Together with its principal tributary, the Sprague River, it provides over half the inflow to Upper Klamath Lake, the largest freshwater lake in Oregon...

, approximately 75 miles (120.7 km) long, in southwestern Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It drains an arid volcanic plateau

Volcanic plateau

A volcanic plateau is a plateau produced by volcanic activity. There are two main types: lava plateaus and pyroclastic plateaus.-Lava plateau:...

 region east of the Cascade Range

Cascade Range

The Cascade Range is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades...

 in the watershed of the Klamath River

Klamath River

The Klamath River is an American river that flows southwest through Oregon and northern California, cutting through the Cascade Range to empty into the Pacific Ocean. The river drains an extensive watershed of almost that stretches from the high desert country of the Great Basin to the temperate...

.

It is formed by the confluence of its north and south forks in eastern Klamath County

Klamath County, Oregon

-National protected areas:* Bear Valley National Wildlife Refuge* Crater Lake National Park * Deschutes National Forest * Fremont National Forest * Klamath Marsh National Wildlife Refuge* Lower Klamath National Wildlife Refuge...

, approximately 35 miles (56.3 km) east-northeast of Klamath Falls

Klamath Falls, Oregon

Klamath Falls is a city in Klamath County, Oregon, United States. Originally called Linkville when George Nurse founded the town in 1867, after the Link River on whose falls this city sat, although no falls currently exist; the name was changed to Klamath Falls in 1892...

 at 42.4376500°N 121.1094355°W. The North Fork Sprague River, 30 miles (48.3 km), rises in southwestern Lake County

Lake County, Oregon

Lake County is a county in the high desert south central region of the U.S. state of Oregon, so named for the many lakes found within its boundaries, including Lake Abert, Hart Lake Reservoir, and Goose Lake. While Lake is among Oregon's largest counties, it is sparsely populated with 7,895...

 in the Fremont National Forest

Fremont National Forest

The Fremont National Forest is a United States National Forest named after John C. Frémont, who explored the area for the United States Army Corps of Engineers in 1843. It is located in western Lake and eastern Klamath counties in Oregon, and has a land area of . There are local ranger district...

 near Gearhart Mountain at 42.5287618°N 120.8183115°W and flows southwest. The South Fork Sprague River, 30 miles (48.3 km), rises northeast of Quartz Mountain Pass at 42.4815400°N 120.7869201°W and flows west-northwest. The combined stream flows west through the broad Sprague Valley, past the small communities of Bly

Bly, Oregon

Bly is an unincorporated community in Klamath County, Oregon, United States. It is about east of Klamath Falls. , the population was 486.- History :...

, Beatty

Beatty, Oregon

Beatty is an unincorporated community in Klamath County, Oregon, United States. Beatty is located on Oregon Route 140 at the confluence of the Sycan and Sprague Rivers and is 30 miles east of Klamath Falls....

, and Sprague River

Sprague River, Oregon

Sprague River is an unincorporated community in Klamath County, Oregon, United States. It is located about northeast of Klamath Falls near the Sprague River, northwest of Oregon Route 140.-History:...

. It joins the Williamson from the east at Chiloquin

Chiloquin, Oregon

Chiloquin is a city in Klamath County, Oregon, United States. Chiloquin was the pioneer version of a Klamath family name Chaloquin, which was the name of a Klamath chief who was alive at the time of the treaty of 1864...

, about 10 miles (16.1 km) north of the mouth of the Williamson on Upper Klamath Lake

Upper Klamath Lake

Upper Klamath Lake is a large, shallow freshwater lake east of the Cascade Range in south central Oregon in the United States. The largest freshwater body in Oregon, it is approximately 20 mi long and 8 mi wide and extends northwest from the city of Klamath Falls...

 at 42.5712475°N 121.8744593°W.

It receives the Sycan River

Sycan River

The Sycan River is a tributary, about long, of the Sprague River in the U.S. state of Oregon. The headwaters are in highlands in the Fremont National Forest south of Summer Lake. The river runs northwest into the Sycan Marsh in southern Lake County, from which it flows generally southwest to join...

from the north at Beatty. Superb trout fishing exists in the Sprague and its tributaries.