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    Final span of Long Island Bridge demolished

    The final span of the crumbling Long Island Bridge was demolished Thursday morning in a controlled detonation.

    The demolition targeted the last six spans of the bridge, each about 250 feet long, the mayor’s office said. Other pieces of the bridge, which stretched a total of 3,450 feet, have been taken down in multiple controlled demolitions since February.

    The cost of the bridge demolition, which will be completed by Walsh Construction Co. of Chicago, is about $20.6 million, said Bonnie McGilpin, spokeswoman for Mayor Martin J. Walsh.

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    The bridge, which opened in 1951, was closed abruptly Oct. 8 by Walsh because of concerns about its condition.

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    Before the closing, hundreds of homeless people, those struggling with addictions, and troubled teens traveled across the bridge to receive services on the 225-acre island. The closing set off a scramble to find alternative spaces for them.

    The City of Boston is seeking proposals for a design for a new bridge. The design is expected to cost $9 million. Building a new bridge is expected to cost at least $80 million.

    Aneri Pattani can be reached at aneri.pattani@globe.com. Follow her on Twitter @apattani95.