Coquille River in Spring, Siskiyou National Forest, Oregon

The South Fork Coquille River is the largest tributary of the Coquille River in coastal Oregon in the United States. From its headwaters in the Oregon Coast Range, the river flows northwest to join the North Fork Coquille River at Myrtle Point, forming the main stem Coquille. The South Fork is about 62.8 miles (101.1 km) long, and its watershed drains roughly 600 square miles (1,600 km2) of rural Coos County.

It rises as a small stream draining out of Eden Valley, 2.5 miles (4.0 km) miles northwest of Mount Bolivar in the Siskiyou National Forest. Picking up scores of tributaries, such as Wooden Rock, Clear and Panther Creeks, the river gains volume as it rumbles southwest into a deep gorge. At the confluence with Rock Creek, the river abruptly swings north, receiving Johnson Creek from the left a few miles further downstream. Now a fairly large stream, the South Fork winds through canyons to the confluence with Coal Creek before entering an alluvial valley near the small community of Powers.

Below the city, the South Fork flows north through a canyon into another broad valley, now followed by Oregon Route 542, and passing Coquille Myrtle Grove State Park and Albert H. Powers Memorial State Park. About a mile downstream, Dement Creek enters from the left and the terrain around the river transforms from hills to farmland. As it assumes a meandering course, the river passes Broadbent, then the Middle Fork Coquille River, by far the largest tributary, enters from the right, marking the head of tide. A few miles onward, the river passes Myrtle Point and meets the North Fork to form the Coquille River, 36.3 miles (58.4 km) upstream of the Pacific Ocean.

The South Fork Coquille River has two major waterfalls, situated in a steep and remote canyon just upstream of the first major northward bend of its course. These are the 35-foot (11 m) Upper Coquille River Falls,and the much larger 110-foot (34 m) Coquille River Falls.

The watershed is sparsely populated, with most of the people concentrated in the towns of Powers and Myrtle Point. Anadromous fish including salmon and steelhead inhabit much of the river, but some habitat has been compromised due to poor watershed management practices such as excessive logging and clearing.

Coquille River in Spring, Siskiyou National Forest, Oregon

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