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Siskiyou Pass. Siskiyou Pass, including the 4,310-foot-high Siskiyou Summit of I-5 that is located a short distance east of the original historic pass, is the highest and most historically significant mountain crossing on the main transportation route that links California and Oregon.
See also: List of mountain peaks of the United States. Mount Whitney in the Sierra Nevada is the highest peak in the U.S. State of California. This article comprises three sortable tables of major mountain peaks of the U.S. State of California.he first 16 of these summits each have at least 4000 meters (13,123.4 feet) of topographic elevation and at least 500 meters (1640.4 feet) of topographic prominence. See the Highest mountain peaks of California for a table of these summits.