Middle Fork Snoqualmie River

The Middle Fork Snoqualmie River runs through a roughly 35 miles (56 km) portion of the Cascade Range in western Washington, United States. It is the largest of the three forks of the Snoqualmie River. Originating at the crest of the range near La Bohn Peak, it flows west through an initially narrow river channel, which widens into a broad river valley with a substrate of earth and rock banks. It meets the North and South Forks near the town of North Bend, forming the mainstem Snoqualmie, which itself later forms the Snohomish River and drains into Puget Sound. The river basin is home to various animal species, including beavers, black bears, cutthroat trout, and mountain whitefish.

The valley was heavily shaped by glacier movement during the Quaternary glaciation, when the present of a glacial dam created a large proglacial lake in its valley. Indigenous peoples have lived in the region for many millennia, and a Snoqualmie village was located near its confluence with the South Fork in precolonial times. Euro-American settlement and intensive logging in the region began in the late 19th century, with logging activity peaking in the 1940s and then gradually declining. Much of the basin is now part of the Mount Baker–Snoqualmie National Forest and its Alpine Lakes Wilderness. It is used for various recreational purposes, alongside some quartz mining. A portion of the river was declared part of the National Wild and Scenic Rivers System in 2014.