Now a hill, it was surface mined for limestone in the 20th century.

[4] The hill was named after a local 19th century hunter, Isaac Slover, who lived near it and who died in 1854 in the Cajon Pass from injuries caused by a bear.

[5] The Colton Liberty Flag formerly stood atop the mountain.

[4] Before the mountain was mined for marble and limestone,[citation needed] it stood as the tallest in the San Bernardino Valley, at 1,184 feet (361 m).

This San Bernardino County, California–related article is a stub.