PROJECT DESCRIPTION

Delta provided structural engineering design of concrete retaining walls, which support the Cumberland flyover bridge ramps.

The overall Cumberland Flyover Project included the following construction and improvements:

• New flyover bridge from the eastbound Jane Addams Memorial Tollway (I-90) consisting of four spans (approximately 845-feet long) crossing the CTA Blue Line and eastbound I-190
• Four retaining walls located east and west of the flyover bridge structure
• New eastbound collector-distributor roadway exiting to southbound Cumberland Avenue from eastbound I-90
• Proposed drainage, high-mast tower lighting, conventional roadway lighting, CCTV camera towers, landscaping, pavement markings and signing
• Resurfacing of eastbound mainline I-90 from I-190 to west of Cumberland Avenue
• Reconstruction and widening of eastbound I-190 from the Des Plaines River to the I-190 / I-90 merge

This project collaboration between CDOT, IDOT, and Tollway provides the following benefits:

• Reduced congestion and travel times
• Enhanced safety
• Lower operations and maintenance costs
• Improved geometric and interchange design

DELTA STRUCTURAL DESIGN

The bridge approach retaining walls were designed as cast-in-place concrete to resist soil, vehicular live load, and lateral crash impact loading. Retaining wall foundations incorporate concrete-filled, metal shell piles and have a maximum soil retained height of 19’-6”. Aesthetic treatment is accounted for by means of a form liner. Combined length of walls is 1,094’-7”.