Southeast Channel skirts the reefs S of East Key and Middle Key, and passes between the 25-foot shoal S of Hospital Key and Iowa Rock off Bush Key Shoal. Iowa Rock is marked by a light. The reefs S of Middle Key can be cleared by keeping S of a line through the abandoned lighthouse on Fort Jefferson and Dry Tortugas Light. The channel has depths of 20 feet or more, but it should be used with caution by vessels drawing more than 18 feet. In Southeast Channel, 1 mile E of Garden Key, the current floods N and ebbs S with an average velocity of 0.6 knot.
The current floods N and the ebb S at an average velocity at strength of 0.6 knot.
Le canal SE longe les rochers S de East Key et Middle Key, et passe entre le S du banc de 7,5 m de Hospital Key et à l'extérieur de Iowa Rock et Bush Key Shoal. Iowa Rock est signalé par un feu. Les rochers S de Middle Key peuvent être quittés en gardant le S d'une ligne passant entre le phare abandonné de Fort jefferson et le phare de Dry Tortugas. Le chenal a une profondeur de 6 m ou plus, mais il doit être pris avec précaution par les navires avec plus de 5,4 de TE. Dans le chenal SE, 1 M à l'E de Garden Key, les flux N du courent et les reflux S ont une vitesse moyenne de 0,6 n?uds.
Le courant des flux N et reflux S ont une vitesse moyenne de 0,6 n?uds.
Bird Key Harbor, reached through the narrow channel encircling Garden Key, wich is well marked, is an excellent anchorage. The entrance to Bird Key Harbor is narrow, and care is required to avoid the shoals on either side. The main entrance channel is marked by daybeacons.
Garden Key is the site of historic Fort Jefferson National Monument, a hexagonal structure with walls 425 feet long rising from a surrounding moat. In 1846, the US Army began to construct a massive fortification on the tiny island known as Garden Key. Sixteen million bricks were ...
the best shelter is SW of Garden Key and the channel encircling it, where protection is afforded from NW winds. However, the holding ground is poor, as boats drag anchor along the silty bottom. Anchorage overnight is allowed in this area.
The lighthouse on Garden Key arose in 1826. After the 1873 hurricane, a new lighthouse of iron plate was built atop Fort Jefferson, 70 feet High atop the fortress, marking the harbor entrance until its deactivation in 1924.