North Avenue Bridge in Chicago, Illinois by Muller+Muller, Ltd.

North Avenue Bridge in Chicago, Illinois by Muller+Muller, Ltd.

Credit: Courtesy Muller+Muller, Ltd.

The bridges spanning the north branch of this urban river have become increasingly obsolete as the economy, transportation patterns, and the demographic make up of this city have changed over the last 40 years. As industrial river traffic flowing below the bridges has decreased, automobile traffic running over them has jumped dramatically. The aging lift bridges no longer operate in most cases and are in need of substantial maintenance and repairs. With this in mind local transportation agencies have embarked on a systematic evaluation and replacement strategy which aims to provide efficient river crossings which add value to the city’s urban fabric.

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