Transportation

Engineers: South Florida bridges rated ‘deficient’ remain safe to use

 

While most bridges technically designated as ‘structurally deficient’ remain safe, the cost of maintenance is mounting, and the flow of money to eventually replace them is uncertain.

 
The Broad Causeway bridge at the eastern end of the causeway (on the Bay Harbor Islands town side), which has been rated as structurally deficient, February 1, 2013.
The Broad Causeway bridge at the eastern end of the causeway (on the Bay Harbor Islands town side), which has been rated as structurally deficient, February 1, 2013.
CHARLES TRAINOR JR / MIAMI HERALD STAFF

Deficient bridges

These are some bridges classified as structurally deficient by the Florida Department of Transportation, with the year they were built:

Miami-Dade County

•  Miami Avenue drawbridge over Miami River, Miami, 1985

•  Pine Tree Drive bridge over the Flamingo Waterway, Miami Beach, 1956

•  Broad Causeway east bridge, Bay Harbor Islands, 1951

•  Southwest First Street drawbridge over Miami River, Miami, 1921

Broward County

•  Sunrise Boulevard over the Middle River, Fort Lauderdale, 1957

•  Eastbound Broward Boulevard bridge over the North Fork of the New River, Fort Lauderdale, 1949

•  Southwest 45th Street (Orange Drive) bridge over N-17 canal, Davie, 1973


“We’re going to have a brand-new bridge,” he said.

In the meantime, the agency plans to begin repairs in August to shore up support on one of the bridge’s two piers. That work is expected to be finished by December.

No ‘emergency’

“There’s no immediate need to declare an emergency or anything like that,” Fernandez said.

In Broward, FDOT will replace the Sunrise Boulevard bridge, which temporarily had the steel beneath its deck reinforced, starting in September. In 2016, the agency plans to replace the 1949 bridge at Broward Boulevard over the North Fork of the New River because its substructure — the piers or foundations holding up the structure — are too deteriorated.

The town of Davie, meanwhile, is now replacing the Southwest 45th Street (Orange Drive) bridge over the N-17 canal, a job to be completed in June.

Miami-Dade has slated some major work on a couple of bridges, including the Miami Avenue drawbridge over the river. The 1985 bridge needs a new metal surface deck and some minor mechanical and electrical work. The $5 million cost will be covered mostly by 2004 voter-approved, general-obligation bonds that earmarked several aging bridges.

Swing Bridge

The county is also replacing the quaint but obsolete Tamiami swing bridge farther up the river with a $32 million bascule-style drawbridge, with half the cost to be covered by the general obligation bonds and half by FDOT. The historic swing bridge will be moved to a nearby city park.

But the county has yet to identify funding for replacement of the structurally deficient Pine Tree Drive bridge over the Flamingo Waterway in Miami Beach, estimated at $10 million. Until then, public works will extend its life by doing repairs, including a $940,000 job this summer to replace the bridge’s deteriorated center span.

At some point, though, as happened with Bear Cut, engineers will decide that patchwork will no longer do.

“It gets to the point where the repair work is not feasible anymore,” Cotarelo said.

Read more Miami-Dade stories from the Miami Herald

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