The National Park Service is preparing to patch up the Arlington Memorial Bridge one last time, but even that fix will only extend the life of Washington's most iconic river crossing by another five years.

WASHINGTON (AP) — The National Park Service is preparing to patch up the Arlington Memorial Bridge one last time, but even that fix will only extend the life of Washington’s most iconic river crossing by another five years.

The steel supports of the 84-year-old bridge are rusting through, and its concrete decking has been reduced to gravel. It needs to be completely reconstructed at a cost of $250 million or it will be closed by 2021, park service officials say, and the park service doesn’t have the money to do it.

The park service has a $3 billion annual budget, and only $268 million is currently budgeted for transportation infrastructure. In addition to the bridge, the park service has another 5,000 miles of paved roads to maintain.

The bridge is far from the only park service property in need of repair: The park service has put off $11.9 billion in maintenance, and about half of those costs are related to transportation infrastructure. But if the bridge were to close, its absence would be acutely felt by Washington-area residents and commuters as well as tourists.

“The bridge is a really good example of what happens when you defer maintenance,” park service director Jonathan Jarvis told The Associated Press. “If the park service had had the funding over the lifespan this past 80 years, we probably could have extended the life of the bridge. Because we just didn’t have the funding, you wind up with it in this condition.”

The bridge connects the Lincoln Memorial with Arlington National Cemetery and the Robert E. Lee Memorial and was built to commemorate the reunification of the United States after the Civil War. It also figures prominently in some major events on the Washington calendar: the “Rolling Thunder” tribute to missing soldiers; the July Fourth celebrations on the National Mall; and the Marine Corps Marathon.

Even with a 10-ton limit on the weight of vehicles permitted to cross the span — tractor-trailers can’t use it — the bridge carries 68,000 to 70,000 vehicles a day. It’s one of six Potomac River crossings for vehicles in the Washington area.

“The prospect of a shuttered Memorial Bridge is one we cannot live with,” Rep. Don Beyer, D-Va., whose district includes the Virginia side of the bridge, said in a statement to AP. “This challenge demands a solution, and the regional delegation will work together to find it.”

Congresswoman Eleanor Holmes Norton, D-D.C., says repairs to the bridge will require regional support.

“At this point, nothing short of a coordinated regional strategy to rebuild Memorial Bridge is feasible,” Norton said in a news release.

“If we do not act now, we are seeing the beginning of the end for Memorial Bridge, which is dissolving in plain sight into the Potomac River. This bridge, more than any other, is not just a regional bridge. It is the gateway to our nation’s capital from Virginia and the South, and was once a symbol of our nation’s strength,” Norton said.

The park service plans to apply for federal grant money through the transportation bill that Congress approved late last year. If it wins the grant and gets contributions from the District of Columbia and Virginia, that would be enough to pay for the reconstruction, Jarvis said. Otherwise, Congress would have to make a special appropriation to keep the bridge from closing.

The park service has 5,500 miles of paved roads, more than 4,500 miles of unpaved roads and more than 1,400 bridges.

Locally, it maintains the Baltimore Washington Parkway and the George Washington Memorial Parkway.

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