Summary: line is believed to be armored with additional concrete. The light blue lines show the current position of the West entrance mouth. The channel has migrated roughly 53 feet west since 1971. This 2001 aerial photograph of the western entrance shows the presumed location of the sewer line. The armored portion of the pipe is estimated to be roughly 15 feet west of the low tide
Image Dimensions: 468 x 318
Image originally found here.