The upper horizontal surface of the United States geodetic survey bench mark, a bronze tablet placed in the stone step of the west entrance of the W.M.R.R. office building standing on the northeast corner of Railroad Avenue and Third Street “1903 A. D. J. 1903”, is hereby declared to be the primal bench mark of the city, and the elevation thereof is 120 feet above the city base.
(1991 Code, § 1-9)