I believe that you're referring to the post I-75-southbound-closed-by-landslide-in-northern-TN. As it happens, Tennessee (as do most states) has a website that allows you to check on the current conditions of most major roads in the state. Just click on the 'Construction' tab and check out the location. In this particular case, they're calling for the work to be completed around mid-May. The current restriction is that there is a single lane southbound and only two lanes northbound for a stretch of about three miles,
AZBuck