POCATELLO, Idaho (KIFI) — Drivers on Interstate 15 near Pocatello should prepare for detours beginning Sunday night as construction continues between the Northgate and Fort Hall interchanges. According to the Idaho Transportation Department, southbound traffic will be shifted into newly constructed lanes in the median starting May 31. As part of the shift, the southbound off-ramp at the Northgate Interchange and the southbound on-ramp at the For…