The Apalachicola Fort Site is an archaeological site near Holy Trinity, Alabama, United States. Spain established a wattle and daub blockhouse here on the Chattahoochee River in 1690, in an attempt to maintain influence among the Lower Creek Indians. These tribes had rejected Spanish missionaries and were trading with the English. The fort was used for one year and then destroyed by the Spanish when they abandoned the site. It was declared a National Historic Landmark in 1964. The site is currently threatened by a high water table caused by Walter F. George Lake, with damage from erosion and ground slumping.