 coast live oaks ("Quercus agrifolia"), California sycamores ("Platanus racemosa"), white alders ("Alnus rhombifolia"), native willows ("Salix" species), and other riparian habitat vegetation lined the route of the creek and its primary tributaries.The creek and adjacent habitats supported a wide variety of birds, amphibians, fish, insects, and mammals.Most of the creek originally lay in the territory of the Acjachemen and the Tongva peoples, two large Native American groups of present-day Orange, Los Angeles, and San Diego Counties.