 The creek terminates in Arrowhead Marsh, one of the few marshlands left in the East Bay.The marsh formed in San Leandro Bay between 1855 and 1895 from sediments washed down San Leandro Creek during construction of the Lake Chabot dam and also from the logging of the San Antonio Forest.San Leandro Creek was formerly named Arroyo de San Leandro, likely named by the Spanish for St. Leander, 6th-century archbishop of Seville, "Apostle of the Goths".