Obstruction Mantua Creek Anchorage: (per USACE): An obstruction that appears to be a pipe protruding from the seafloor(approx. 55` MLLW) and ending at a depth of 29.9` MLLW has been found in Mantua Creek Anchorage. USCG has placed a temporary red buoy "WR 62", showing a quick flashing red light approximately ten yards toward the channel from the obstruction and also marked it with a synthetic ATON. This obstruction is the more downriver of the two obstructions shown on the attached chart, and is marked as "possible object" on chart. The upriver contact, marked "possible anchor" is still being evaluated.