The Portavant Mound (also known as the Portavant Mound Site or Snead Island Temple Mound or Portavant Indian Mound) is an archaeological site on Snead Island, just west of Palmetto, Florida. On December 23, 1994, it was added to the U.S. National Register of Historic Places.The Portavant Mound (or Snead Island Temple Mound) is one of fifteen or more "temple mounds" produced by the Safety Harbor culture (900-1725) found in the vicinity of Tampa Bay.