Reconstructing the I-57 and IL 16 interchange located east of Mattoon from a cloverleaf to a raindrop diamond configuration.

Description: This is the official Illinois Department of Transportation contract-detail page for the September 18, 2026 letting of item 067-74435, which seeks bids to reconstruct the I-57 and IL 16 interchange located east of Mattoon from its existing cloverleaf configuration into a raindrop diamond configuration in Coles County, Illinois. The page states that bids are now being accepted and that the project replaces and raises the I-57 bridges over IL 16 to provide a minimum 16'-6" vertical clearance, with substantial completion targeted for November 15, 2030 plus 15 working days. The solicitation was previously advertised as items 01X, 050, 131, and 144 in earlier 2025 and 2026 lettings, and plans and special provisions are not yet available at this time.