page_title: Key Bridge (Washington, D.C.)
section_title: 2014 rehabilitation
hierarchical_section_title: Key Bridge (Washington, D.C.) / Renovations and alterations / 2014 rehabilitation
caption_attribution_description: English: Francis Scott Key Bridge, US 29 over the Potomac River Georgetown This is an image of a place or building that is listed on the National Register of Historic Places in the United States of America. Its reference number is 96000199 More images
context_page_description: The Francis Scott Key Bridge, more commonly known as the Key Bridge, is a six-lane reinforced concrete arch bridge conveying U.S. Route 29 traffic across the Potomac River between the Rosslyn neighborhood of Arlington County, Virginia, and the Georgetown neighborhood of Washington, D.C. Completed in 1923, it is Washington's oldest surviving road bridge across the Potomac River.
  Key Bridge was added to the National Register of Historic Places in 1996.
context_section_description: Key Bridge underwent a major inspection in 2011.  Officials were concerned that the chemical agents used to bond the tensioned cables running through the concrete road deck were corroding the concrete. The architectural engineering firm of Johnson, Mirmiran & Thompson (JMT) was hired to inspect the bridge. JMT discovered that the deck slab was ready to fail, and there was extensive corrosive deterioration of the underside of the concrete deck. Cracks were also found in some of the abutments, arches and spandrel arches, concrete deck, and piers. The sonic echo/impulse response method was used to identify areas within the concrete where cables had disintegrated or where corrosion had created voids. JMT restored some deteriorated portions of the deck. The bridge was rated "structurally deficient" after these tests.
  In 2013, Key Bridge carried approximately 62,000 vehicles each day. The Washington Post in April 2014 called Key Bridge one of the three "busiest deficient bridges" in the District of Columbia, along with Arlington Memorial Bridge and the connection between Park Road and the Anacostia Freeway.
  The District of Columbia Department of Transportation (DDOT) announced a two-year, $21 million rehabilitation of the bridge in April 2014. In addition to repairing the previously-identified structural issues, the street lights were replaced with modern energy-efficient lampposts, the guard rail between the roadway and sidewalks was strengthened, the bridge's drainage system fixed and improved, and the bridge painted.
caption: View of the Francis Scott Key Bridge, US 29, over the Potomac River from Georgetown
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