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Mount Disappointment is a mountain in the San Gabriel Mountains in Los Angeles County, California with a summit elevation of 5,963+ feet (1,818+ m). It was named "Disappointment" in 1894 when USGS surveyors sighted it from the Santa Susana Mountains, believing it to be the highest point in the immediate area, decided to use it as their next triangulation point. When they reached the summit, however, they discovered that San Gabriel Peak half a mile (0.8 km) to the east was 167 feet (51 m) higher and it was a disappointment so they moved there instead.[1]

Mount Disappointment
Mt disappointment.jpg
Mount Disappointment from the west, May 2009.
Highest point
Elevation5,963+ ft (1,818+ m)  NAVD 88[2]
ListingHundred Peaks Section[1]
Coordinates34°14′48″N 118°06′17″W / 34.2466697°N 118.1047923°W / 34.2466697; -118.1047923Coordinates: 34°14′48″N 118°06′17″W / 34.2466697°N 118.1047923°W / 34.2466697; -118.1047923[3]
LocationLos Angeles County, California, U.S.
Parent rangeSan Gabriel Mountains
Topo mapUSGS Mount Wilson
First ascent1875 by F. Kampf, W.A. Coles, and Frank Holland
Easiest routeHike, class 1[1]

A Nike missile site was located there in 1955 and the summit was flattened to accommodate it. The missile site was abandoned in 1965. The mountain top is now an important telecommunications site for both commercial and government organizations.[1]


  1. ^ a b c d "Mount Disappointment". Hundred Peaks Section List. Angeles Chapter, Sierra Club. Retrieved 2009-12-27.
  2. ^ "Mount Disappointment, California". Retrieved 2009-08-09.
  3. ^ "Mount Disappointment". Geographic Names Information System. United States Geological Survey. Retrieved 2009-08-09.