Bare Island Fort is nationally rare as an early example of concrete construction, regionally representative as a demonstration of the technology of coastal artillery, fortification design and military tactics in the late 19th century, of high archaeological potential to reveal information not available from other sources about the construction and use of the Fort, of high significance for its potential to derive information that cannot be found on other sites, of medium to high significance for its ability to address pertinent research questions, and of low significance for the potential of its subsurface archaeological remains.