Fort Gaddis is the oldest known building in Fayette County, Pennsylvania and the second oldest log cabin in Western Pennsylvania. It is located 300 yards (270 m) east of old U.S. Route 119, near the Route 857 intersection in South Union Township, Pennsylvania (east of Hopwood and south of Uniontown). Fort Gaddis was built about 1769-74 by Colonel Thomas Gaddis who was in charge of the defense of the region, and his home was probably designated as a site for community meetings and shelter in times of emergency, hence the term "Fort Gaddis," probably a 19th-century appellation. It is a 1 1/2-story, 1-room log structure measuring 26 feet long and 20 feet wide.During the Whiskey Rebellion a Liberty Pole was erected at the house during a rally in support of the rebel cause. The choice of this site for a political demonstration indicates its importance as a focal point for community expression. The fact that all the additions to the building were removed in the early twentieth century in respect for the section contemporary with the American Revolution and Whiskey Rebellion is evidence of the building's longstanding and continuing status and power as a community symbol.
Fort Gaddis was built near the Catawba Trail, an important north-south route that extended from New York to Tennessee and passed through Uniontown, Pennsylvania and Morgantown, West Virginia. In the 19th century the trail became locally known as the Morgantown Road. It is now Old U.S. Route 119. About 2 miles north on this road is Uniontown, the Fayette County, Pennsylvania seat, settled in the late 1760s and founded in July 1776 as Beeson's Mill.History fans and researchers should be aware that, depending on which sources are consulted, Fort Gaddis can also be known as the "Thomas Gaddis Homestead", the "Thomas Gaddis House" or "Gaddis' Fort".
It was added to the National Register of Historic Places in 1974 as the Thomas Gaddis Homestead.
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