The Capitol Dome
The exterior dome of the Legislative Building rises to 287 feet. The exterior dome is one of the two domes. There is also an interior dome that rises 175 feet from the Rotunda floor. Within the exterior dome and interior dome, is a conical brick structure that bears the weight of the 500,000-pound cupola, which houses the lantern.
The Legislative Building’s exterior dome is the largest in North America constructed of brick and concrete. The combined weight of the domes and cone structure – 33 million pounds. Massive concrete arches in the rotunda carry the weight of the domes.
The exterior lighting of the dome, including the cupola lantern, is powered by solar panels installed on the south roof of the Legislative Building. There is no public access to the dome proper at the State Capitol.