Telegraph Peak, is a peak of the San Gabriel Mountains, in the San Gabriel Mountains National Monument and San Bernardino County, California.

With an elevation of 8,989 feet (2,740 m), it is highest point in the Cucamonga Wilderness of the San Bernardino National Forest.

[1] Most of the bedrock, including that of the summit, is cataclastic gneissGranodiorite underlies much of the southern portion.

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