(Here's another installment in a series of posts about how Mayor Rahm Emanuel and President Forrest Claypool are building their CTA legacy with about $1 billion in capital improvements.)
The current Purple Line viaduct replacement project replaces three existing viaducts that are more than 100 years old at Greenleaf, Dempster and Grove streets in Evanston.
This weekend the CTA will roll the new viaduct into place at Greenleaf. Thus rail service along the Purple Line will be temporarily suspended from the Howard to the Davis Street station beginning at 8:30 p.m. Friday till 4 a.m. Monday.
The $15 million project includes:
- Replacement of existing concrete viaducts at Greenleaf, Dempster, and Grove, with new, longer steel bridge spans. New bridges will include new ties, rail and ballast along with new drainage systems.
- New sidewalks, fencing, and landscaping at each viaduct.
- Replacing a 320-foot long timber retaining wall north of Greenleaf with new pre-cast concrete wall.
- Rehabilitation of existing retaining walls along Chicago Avenue between South Blvd. and Madison Street, and adjacent to the Greenleaf Street viaduct (a total of 2,064 feet of wall repairs).
The project will be "substantially" completed by May 2013. The CTA has hired Kiewit Infrastructure to do this work - the same company that got a $59 million contract for the North Red Line Interim Improvement project.
Funding for the project is provided by an Illinois Department of Transportation grant through the Regional Transportation Authority.