In 1970, road machinery used in its construction accidentally dug up several cannonballs and crumbling kegs of black powder about 10 miles west of Sabine Pass. Further excavation eventually produced more kegs of black powder and several hundred cannonballs.
The ammunition had been buried there by Confederate soldiers in what were the ditches of Fort Manhassett in 1865. Fort Manhassett was a series of earthworks constructed by the Confederacy in 1863 to defend the western approaches to Sabine Pass.