The West Branch of the Mad River is a 3.2-mile-long (5.1 km)  stream located in the White Mountains of New Hampshire in the United States. It is a tributary of the Mad River, part of the Pemigewasset River and ultimately the Merrimack River watershed.
The West Branch rises east of Thornton Gap, between Mount Osceola and Mount Tecumseh, two major summits of the White Mountains. The stream flows east, paralleled by the Tripoli Road, until it encounters Osceola Brook joining from the north, then turns south into the intervale in which the village of Waterville Valley is situated. The West Branch joins the Mad River close to the center of the Waterville Valley resort.
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