Mount Sheridan is part of the Red Mountains. NPS / R. Lake. All NPS. This small range of mountains, located just west of Heart Lake, is completely contained within the boundaries of Yellowstone National Park. In 1871, F.V. Hayden named present-day Mount Sheridan 'Red Mountain.' In 1872, members of the second Hayden Survey transferred that name to the entire range. The name was 'derived from the prevailing color of the volcanic rocks which compose them' (Hayden, Twelfth Annual Report, p. 470). In 1878, Henry Gannett reported that there were 12 peaks in the range, with 10,308-foot-high Mount Sheridan being the highest.