The Middle Fork, approximately 41 miles (66 km) long, originates from Chains Lakes, 47°33′30″N 121°14′15″W, and flows south to Williams Lake, then in an easterly direction until it meets with the North Fork near North Bend.
 It receives the waters of the Taylor River and the Pratt River in short order about halfway between its source and its mouth.
 It has one major waterfall along its course.
The upper reaches of the Middle Fork, Taylor, and Pratt river valleys are within the boundaries of the Alpine Lakes Wilderness area.

The Middle Fork Valley is a popular recreational area since it is accessible during the winter due to its low altitude and close proximity to Seattle.
 For many years the Middle Fork Road extended 24 miles to Hardscrabble Creek, but was gated at Dingford Creek in June 2007, 18 miles in.
The gate at Dingford Creek was a controversial part of the Access and Travel Management plan adopted by the US Forest Service in 2005.
Much of the road's route is on the 1920s and 30's era railroad grade of the North Bend Timber Company.
The paved portion of the Middle Fork road was extended by 9.7 miles during a 3-year construction project from 2014-2016, extending pavement to just before the Taylor River bridge.
The Middle Fork Valley was heavily logged starting in 1923 and continued up through the 1970s.
 The obvious railroad grades, pilings, and related debris are from the North Bend Timber Company's company's activity from 1923 to 1941.
The Middle Fork, approximately 41 miles (66 km) long, originates from Chains Lakes, 47°33′30″N 121°14′15″W, and flows south to Williams Lake, then in an easterly direction until it meets with the North Fork near North Bend.  It receives the waters of the Taylor River and the Pratt River in short order about halfway between its source and its mouth.  It has one major waterfall along its course. The upper reaches of the Middle Fork, Taylor, and Pratt river valleys are within the boundaries of the Alpine Lakes Wilderness area.
The Middle Fork Valley is a popular recreational area since it is accessible during the winter due to its low altitude and close proximity to Seattle.  For many years the Middle Fork Road extended 24 miles to Hardscrabble Creek, but was gated at Dingford Creek in June 2007, 18 miles in. The gate at Dingford Creek was a controversial part of the Access and Travel Management plan adopted by the US Forest Service in 2005. Much of the road's route is on the 1920s and 30's era railroad grade of the North Bend Timber Company. The paved portion of the Middle Fork road was extended by 9.7 miles during a 3-year construction project from 2014-2016, extending pavement to just before the Taylor River bridge. The Middle Fork Valley was heavily logged starting in 1923 and continued up through the 1970s.  The obvious railroad grades, pilings, and related debris are from the North Bend Timber Company's company's activity from 1923 to 1941.
Snoqualmie River