An analysis of the recently-released 2014 U.S. Department of Transportation (U.S. DOT) National Bridge Inventory database finds good news and bad news when it comes to the most heavily traveled U.S. bridges. The good news is that there are 7 fewer structurally deficient structures in Colorado than there were in 2013.

The analysis of the federal government data shows cars, trucks and school buses cross Colorado’s 529 structurally compromised bridges 3.7 million times every day. Not surprisingly, the most heavily traveled are on the Interstate Highway System, which carries the bulk of truck traffic and passenger vehicles.

The top 10 most heavily traveled structurally compromised bridges in the state are:

— I-70 over Havana Street and the Union Pacific Railroad (Denver County)

— US-6 over the South Platte River (Denver County)

— US-6 over the BNSF Railroad (Denver County)

— US-6 over Bryant Street (Denver County)

— US-6 over Garrison Street (Jefferson County)

— US-6 over SH 121 (Jefferson County)

— I-70 over Harlan Street (Jefferson County)

— US-85 SB over the South Platte River (Denver County)

— I-70 WB over the Union Pacific Railroad (Denver County)

— I-70 EB over SH 35 (Denver County)

The bridge problem could get a whole lot worse soon, Black warns. The federal Highway Trust Fund (HTF) is the source of 52 percent of highway and bridge capital investments made annually by state governments. The HTF has suffered five revenue shortfalls between 2008 and 2014, and has been bailed out with nearly $65 billion in revenues from the General Fund just to preserve existing investment levels. The latest extension of federal highway and transit funding through the HTF expires on May 31, absent congressional action. Nearly a dozen states so far have canceled or delayed road and bridge projects because of the continued uncertainty over the trust fund situation. ARTBA expects that number to increase as the deadline nears.

“State and local governments are doing the best they can to address these significant challenges, given limited resources,” Black says. Bridge investments have been growing in recent years, Black says, but it has come at the expense of highway and pavement spending, which has dropped over 20 percent in the last five years.

“Without additional investment from all levels of government, our infrastructure spending will be a zero-sum game,” she said, noting that there is a current backlog of over $115 billion in bridge work and $755 billion in highway projects, according to U.S. DOT data.

“Many of the most heavily traveled bridges are nearly 50 years old. Elected officials can’t just sprinkle fairy dust on America’s bridge problem and wish it away,” Black said. “It will take committed investment by legislators at all levels of government.”

Bridge decks and support structures are regularly inspected by the state transportation departments for deterioration and are rated on a scale of zero to nine–nine being “excellent” condition. A bridge is classified as structurally deficient and in need of repair if its overall rating is four or below.

While these bridges may not be imminently unsafe, ARTBA believes that signs should be posted so the public understands they have structural deficiencies that need repair.

The ARTBA analysis of the bridge data supplied by the states to the U.S. DOT also found:

— Colorado ranks 30th place nationally in the number of structurally

deficient bridges–529.

— Colorado ranks 38th place in the percentage of its bridges that are

classified as structurally deficient–6 percent.

State specific bridge information from the analysis–including rankings and location lists of the 250 most heavily travelled structurally deficient bridges in the nation and top five most heavily travelled in each state–is available at www.artba.org/bridges.

Established in 1902, the Washington, D.C.-based ARTBA is the “consensus voice” of the U.S. transportation design and construction industry before Congress, the White House, federal agencies, news media and general public.

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