why is it called golden gate bridge if it is red

The name of the bridge is originated in the name of the strait it bridges. On July 1, 1846, two years before the discovery of gold in California U.S. Army Captain John C. Fremont gazed at the narrow strait that separates the Bay for the Pacific Ocean. Like many others coming to this place Fremont was gripped by a vision of the future. He saw the establishment of towering cities on this wild shore. He envisioned processions of ships coming and going on long trade routes to Asia. Like the ancient harbor of Byzantium at the crossroads between Europe and Asia, this too would surely become a center of world commerce. For the mighty portals giving entrance to this harbor Fremont conceived an inspired name: Golden Gate. “I gave [it] the name Chrysopylae, or Golden Gate, for the same reason that the harbor of Byzantium was called Chrysoceras or Golden Horn,” he later wrote. Copy & pasted from Quora

Aracelis, Now that's an answer.