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 so moved there instead.
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.
There's a trail called Mount Disappointment Road leading to the summit.
By elevation Mount Disappointment is
# 57 out of 140 in Angeles National Forest # 42 out of 256 in Los Angeles County # 59 out of 142 in the San Gabriel Mountains
By prominence Mount Disappointment is
# 90 out of 140 in Angeles National Forest # 84 out of 142 in the San Gabriel Mountains
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