Notch Mountain is an 11,263-foot summit in Utah's western Uinta Mountains, about 50 miles east of Salt Lake City in the Uinta-Wasatch-Cache National Forest. On a divide between the headwaters of the Weber and Provo rivers, it is named for a gap between its two high points, a name officially adopted in 1932. The mountain rises sharply above Wall Lake, source of the Provo River, and is commonly approached from the Mirror Lake Highway by a trail that passes through the gap but not to the summit. Its ancient metasedimentary bedrock, later uplift and glaciation, and subarctic summit conditions define both its landscape and character.