Statement of Significance (as of designation - December 19, 1960):
Located on the east bank of the Mississippi River across from the later Fort Jackson, this fort was built by the French in 1746 and rebuilt by the Spanish in 1791. Like Fort Jackson, Fort St. Philip surrendered to Union forces after its bombardment and passage by Flag-Officer David G. Farragut's squadron in April 1862.

Condition:
Addressing the condition of the site is made much more difficult by the fact that it is no longer vehicle accessible, as the nearest road is 20 miles up river. It is now only accessible by boat or helicopter, which further complicates efforts to mitigate damage to the site. There are clearly many significant problems facing the fort, but the head of the historical society is convinced that they are not insurmountable and that the value of the site means that all available resources should be brought to bear to ensure its rehabilitation and preservation.

Any historians wishing to visit the Fort must first sign a "hold harmless" agreement. It is in very dangerous condition.