In years gone by, the City of San Diego dredged the area of Rose Creek downstream of Garnet Avenue and the area was an earthen bottom channel. Once that stopped, about 25 years ago, natural processes started to repopulate the area and create a salt marsh used by local and wintering birds, bugs, and even a few raccoons and rabbits. Leading to the habitat we see today. But how did this happen?
Watch this great video on how a salt marsh is formed.