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I-57 at I-294 Interchange

Cook County, Illinois

Market Sector

Surface Transportation


Roadway Design

Services Provided

Design, Planning



In The News

Photo Credit: BluePrint22 Photography
Photo Credit: BluePrint22 Photography
Photo Credit: BluePrint22 Photography
Photo Credit: BluePrint22 Photography

T.Y. Lin International (TYLI) provided Phase I Environmental Assessment and Phase II Engineering Services for the construction of the new I-57 Interchange at I-294 (Tri-State Tollway) in Cook County, Illinois, for the Illinois Department of Transportation (IDOT).

TYLI also performed analysis for the construction of a new, adjacent partial diamond interchange where I-294 crosses over 147th Street (IL 83) and proposed improvements to the existing I-57/147th Street diamond-type interchange. In addition, potential capacity issues, roadway deficiencies, and safety needs along 147th Street were addressed.

Project Highlights:

  • The Environmental Assessment was processed using an accelerated schedule, with design approval received one year after notice-to-proceed.
  • TYLI investigated the project area, conducted studies, and made recommendations in a Combined Design Report, with Structure Type, Size and Location drawings for 19 structures.
  • A Crash Analysis Report and overall project Maintenance of Traffic planning and scheduling were provided.
  • Along with a Constructability Review, TYLI evaluated the interchange design according to the I-LAST™ Illinois-Livable and Sustainable Transportation (I-LAST) Rating System and Guide.
  • The project included providing the Project Management Plan, the Project Financial Plan, coordination with numerous subconsultants, and project scheduling for plan production bidding and construction.
  • Fifteen (15) separate sets of construction bid packages were prepared, including plans, specifications, schedules, and costs estimates.
  • Extensive coordination was required with IDOT, the Illinois State Toll Highway Authority, five adjacent suburban communities, other related permitting agencies, and subconsultants.

Project elements analyzed by the TYLI team in Phase I include the geometry of multiple new ramps and flyover bridges at the I-57/I-294 Interchange, bridge replacements at the I-57/147th Street and I-294/147th Street Interchanges, and bridge inspections and condition reports for modifications to accommodate new or revised geometrics. Other elements included multiple retaining walls, and extensions and/or replacements of existing box culverts and new box culverts.

TYLI also provided the Drainage Study for the relocation of Dixie Creek, compensatory storage, detention pond analysis and locations, and floodway impacts. Conceptual signage, pavement marking types, traffic signals, lighting concepts, and the inclusion of an all-electronic toll collection system were assessed as well.

Along with main contracts for roadways, ramps, and bridges in Phase II, small business contracts were also prepared for the demolition of 32 buildings, utilities relocation, off-system roadway pavement work, and aesthetic landscaping.

National Recognition Award, 2015
American Council of Engineering Companies (ACEC)
Honor Award, 2015
American Council of Engineering Companies of Illinois (ACEC-IL)
Project of the Year Award, 2015
American Public Works Association (APWA), Chicago Metro Chapter
Project of the Year Award, 2015
American Public Works Association (APWA), Southwest Branch
Engineering Excellence Awards, Special Achievement Award, 2010
American Council of Engineering Companies of Ilinois (ACEC-IL)