PROJECT DESCRIPTION

Project limits for I-90 (Jane Addams) east-bound widening are between Elmhurst Road and the I-490 (EOWA) interchange. Proposed improvements include:

• New I-90 EB collector distributor road with three 12’-0” traffic lanes
• I-90 EB CD entrance ramp Y3 from Elmhurst Road interchange
• I-90 EB CD exit ramp X1 to EOWA interchange
• Elmhurst road east bridge approach pavement restoration
• I-90 EB CD Bridge over Higgins Creek
• Noise abatement wall
• Drainage design and calculations
• Signage, MOT, and utility coordination

Delta structural engineers provided concept verification and PS&E design services for the I-90 EB CD Road over Higgins Creek (SN 535CD). This structure has the following features:

• Single 115’-0” span
• Right-forward 13° skew
• 57’-4” out-to-out & 110’-1/4” back-to-back of abutments
• IL54-3838 PPC Beams
• Open integral abutments on 14” metal shell piles

PROJECT CHALLENGES

During construction, the contractor encountered an abandoned underground 120″ diameter watermain.  This required expedited redesign of abutments, approach pile bents and pile spacing to accomodate the large obstruction.