23rd St Humboldt St 24th St 25th St Merchant Rd 23rd St Humboldt St 24th St 25th St Merchant Rd Golden Gate Bridge FULL MARATHON START FULL MARATHON FINISH legend full Marathon Route full Marathon Mile Markers Aid Station Aid Station with Gu Alternate Route START ELEVATION Max elevation gain 27 ft * * ESTIMATED 323 ft * 1175 ft *