Anchorage
APRA HARBOR, GUAM
ANCHORAGE
Due to the great depths and rapid shoaling of the bottom in the vicinity of Apra Harbor, anchorage outside the Harbor is impossible.
Naval Anchorage A, on the south side of Outer Harbor, shows general depths of 42 to 161 ft (12.8 to 49 m) over a charted bottom of mud, sand, clay, and coral. Naval Anchorage B, south of Drydock Island, shows depths of 44 to 72.2 ft (13.4 to 22 m), and has a sand and mud bottom.
Naval Anchorages A and B, in the south and southeast part of the Harbor, respectively, and the mooring buoys therein, may not be used by non-Naval vessels without permission of the local U.S. Naval authorities obtained through the Port Captain. Small craft that are continuously manned and capable of getting underway, may anchor during daylight hours without permission. Local authorities stated during the Site Visit in February 2006 that Navy ships do not use mooring buoys in the Outer Harbor unless it is absolutely necessary. Additionally, Outer Harbor anchorages have been used during normal operations but are never used during typhoons.
The explosive anchorage is situated in the west part of the Harbor, centered on Buoy 702, and is best seen on the chart.
General anchorage is available south of Glass Breakwater, in general depths of 14.8 to 170.6 ft (4.5 to 52 m), and the bottom consists of sand, mud, and coral.
Mooring buoys are laid throughout the Inner Harbor and Outer Harbor, and may best be seen on the chart.
Source: http://www.nrlmry.navy.mil/port_studies/thh-nc/guam/apra/text/sect4.htm
