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They were investigating unusual clay deposits turned up during the course of a Tennessee Department of Transportation highway project to widen State Route 75 south of its intersection with Interstate 26.
Gray lies just outside the junction between Interstate 81 and Interstate 26, the latter of which runs directly through the town.
Jonesborough is centered around the junction of Andrew Johnson Highway (which is part of both U.S. Route 321 and U.S. Route 11), which connects the town to Greeneville to the southwest and Johnson City to the northeast, and Tennessee State Route 81, which connects Jonesborough to Interstate 81 to the northwest and Interstate 26 at Erwin to the southeast.
The Laurel Creek Gorge Bridge is a continuous steel Plate girder bridge that spans Laurel Creek on Interstate 26/U.S. Route 19/U.S. Route 23 between Asheville, North Carolina and Johnson City, Tennessee.