Time-lapse of a trail bridge being installed over Metra+CP/Milwaukee

(Satellite, the east side of the new trail can be seen under construction)

Screenshot (source)
This is part of a trail connection, which will link Middlefork Savanna Forest Preserve to other local trails and parks. Project elements include this 221-foot steel pedestrian bridge (the biggest one in the forest preserves!) over the Metra Railway with a scenic overlook, new 10 foot-wide paved trails, and a revised crosswalk at IL Route 60.

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