The length of the nation's structurally deficient bridges if placed end-to-end would stretch 1,276 miles, half the distance from New York to Los Angeles, a new examination of federal government data shows. It's a problem that hits close to home.

An analysis of the U.S. Department of Transportation's (U.S. DOT) recently-released 2016 National Bridge Inventory data finds cars, trucks and school buses cross the nation's 55,710 structurally compromised bridges 185 million times daily. About 1,900 are on the Interstate Highway System. State transportation departments have identified 13,000 Interstate bridges that need replacement, widening or major reconstruction.

The inventory of structurally deficient bridges has declined 0.5 percent since the 2015 report. At that pace, it would take more than two decades to replace or repair all of them, according to American Road & Transportation Builders Association (ARTBA) Chief Economist Dr. Alison Premo Black, who conducted the analysis.

Black says the data shows 28 percent of bridges (173,919) are over 50 years old and have never had any major reconstruction work in that time.

“America's highway network is woefully underperforming. It is outdated, overused, underfunded and in desperate need of modernization,” Black says. “State and local transportation departments haven't been provided the resources to keep pace with the nation's bridge needs.”

To help ensure public safety, bridge decks and support structures are regularly inspected for deterioration and remedial action. They are rated on a scale of zero to nine—with nine meaning the bridge is in “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, they are in need of attention.

Other key findings in the ARTBA analysis:

Iowa (4,968), Pennsylvania (4,506), Oklahoma (3,460), Missouri (3,195), Nebraska (2,361), Illinois (2,243), Kansas (2,151), Mississippi (2,098), Ohio (1,942) and New York (1,928) have the most structurally deficient bridges. The District of Columbia (9), Nevada (31), Delaware (43), Hawaii (64) and Utah (95) have the least.

At least 15 percent of the bridges in eight states—Rhode Island (25 percent), Iowa (21 percent), Pennsylvania (20 percent), South Dakota (20 percent), West Virginia (17 percent), Nebraska (15 percent), North Dakota (15 percent) and Oklahoma (15 percent)—fall in the structurally deficient category.

State—and congressional district—specific information from the analysis—including rankings and the locations of the 250 most heavily travelled structurally deficient bridges in the nation and top 25 most heavily traveled in each state—is available at www.artbabridgereport.org.

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