As one of the largest and oldest produc ers in the western United States, Cal-Portland Co. has irrevocably woven itself into American history with its rich, storied past. Established in 1891, CalPortland Co.'s first operations began in Colton, Calif, with a ce ment plant that supplied cement for the erec tion of the Hoover Dam. The company is also famous for the Colton Liberty Flag on top of Mt. Slover, which was first raised in 1917 and at the time was one of only three locations in the Unit ed State permitted to fly the flag at night (the other two being the nation's capital and Fred erick, Md., over the grave of Francis Scott Key).
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