Quadriga on top of the Arch at Grand plaza resides at the top and depicts the lady Columbia, an allegorical representation of the United States, riding in a chariot drawn by two horses. Two winged Victory figures, each leading a horse, trumpet Columbia's arrival. The lower pedestals facing the park hold the Spirit of the Army group and the Spirit of the Navy group. Installation of the groups began four years later, starting with the Quadriga on December 4, 1898, and finishing with the Navy group on April 13, 1901. The work took nearly seven years to complete, about twice as long as the construction of the arch itself. The arch is 80 feet high (23 m) and 80 feet wide with an interior arch height of 50 feet