A portion of the highway has dropped about a foot near the 11 mile marker in Henderson County. Engineers believe the sagging part of the road sits atop an old mine shaft and a creek bed. But they can't be sure that is the reason the road is sagging.
"We're not 100 percent sure because we haven't finished our investigation yet," said KYTC Engineer Jason Ward. "But right now we're not seeing anything that's going to be extraordinary as far as making the repairs at this time."
Crews have put up several signs in the area warning drivers of the dip. Since it doesn't pose a huge risk right now, crews plan to have the dip repaired in 2015 during the construction season.