JEFFERSON COUNTY, Ill., (KBSI) — Construction is continuing on a major interstate project at the I-57/I-64 interchange at Illinois 15, according to the Illinois Department of Transportation. Crews are building bridge abutments and a center pier as part of a new diverging diamond interchange. Officials said structural steel installation is expected to begin later this spring. The project is part of a broader effort to expand I-57 across southern …