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Transportation Planning and Design

The existing Mile-Long Bridge is 54 spans with a total length in excess of 4,900’, carrying 8 lanes of I-294 NB/SB over multiple RRs, the Des Plaines River and two canals, two bike paths, MWRD property, Santa Fe Drive, and the 75th St. interchange. TEG provided several bridge inspection team leaders and performed Bridge Condition Report (BCR) inspection for the Mile-Long Bridge. TEG Team Leaders led the overnight BCR inspection work at the LaGrange Road Bridge. TEG staff performed various structural analysis tasks including structural analysis of the steel girder main spans and the structural evaluation for existing piers supporting staged traffic. Constructability services were also provided, as TEG staff was able to author several technical memoranda which helped guide Phase I decisions. Some of the topics included the feasibility of various methods for the installation of drilled shafts in low overhead clearance, lateral analysis of steel girder main spans during staged construction, demolition analysis near existing ComEd overhead power lines, an analysis of likely beam/girder delivery loads, and demolition analysis of the Chicago Sanitary and Ship Canal spans. TEG structural, roadway and construction staff participated in reviewing proposed staging configurations, evaluation of constructability, and preliminary cost and schedule estimates.

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