 After the 1906 earthquake , San Francisco Board of Supervisors voted to fill the creek with earthquake debris , reducing the creek to its present size . During World War II , it served as <unk> areas for large ocean @-@ going <unk> . The area also located the largest <unk> <unk> processing plant in the United States West Coast . In fact , the abandoned five @-@ story high <unk> crane , used to transport large amount of <unk> from ships to the plant as late as 1974 , still remains on the creek bank preserved as a historic landmark . In the 1950s , Islais Creek was home to the largest <unk> <unk> industry in the world . The deteriorated condition of the creek gradually improved after the construction of a water treatment plant in 1970 . Today , the majority of the creek is covered and transformed into a culvert with its remnants flowing at Glen Canyon and near the bay . 
