What caused the crack in the Washington Monument?

At 1:51 p.m. on August 23, 2011, a magnitude 5.8 earthquake struck 90 miles southwest of Washington, D.C. Visitors inside the Washington Monument's observation deck were thrown about by the force of the shaking; falling mortar and pieces of stone caused minor injuries, though all the people inside exited safely.



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The Monument is an engineering marvel. The Washington Post recently pointed out an interesting fact in an on-going debate about the Monument as the world's tallest free-standing masonry structure. The Monument's marble blocks are held together by just gravity and friction, and no mortar was used in the process.

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However, after Washington became president, he scrapped the plans for his memorial, as federal government funds were tight and he didn't want to use public money for the project.

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Facing increased criticism from black leaders and concerns that the water was polluted, Congress voted to ban swimming in the Tidal Basin in 1925. Swimming has never been allowed in the Reflecting Pool, but there were segregated, whites-only swimming pools near the Washington Monument during the late 1920s.

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5 Things You Might Not Know About the Washington Monument
  • Plans for the monument began even before Washington was elected president. ...
  • The original design for the monument was much different than what ended up being built. ...
  • The monument was once the site of a hostage situation. ...
  • The monument has survived an earthquake.


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The two sections closely resembled each other at first, but time, wind, rain, and erosion have caused the marble sections to weather differently, thereby producing the difference in color. A third type of marble is also visible at the dividing line between the two main phases of construction.

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One person (16+ years old) may obtain up to six tickets for an available ticket time. All visitors (including children ages 2+) must have a ticket to enter the Washington Monument. During peak season, tickets run out quickly. Expect a line to form at the ticket window wait long before the ticket window opens.

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In fact, there are three buildings in the District of Columbia that are taller: the Basilica, the Old Post Office Pavilion, and the Washington National Cathedral. But if you expand your definition of “building” to include monuments, the Washington Monument towers over the rest as the tallest building in DC.

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August 2, 1876 Congress appropriates $2 million in federal funds to complete the construction of the Washington Monument. The public funding is contingent upon the transfer of ownership of the monument from The Washington National Monument Society to the federal government.

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As the nation's tallest monument, the Gateway Arch has welcomed visitors for more than fifty years with its iconic, awe-inspiring shape. The vision of renowned architect Eero Saarinen, the Gateway Arch commemorates Thomas Jefferson's vision and St. Louis' role in the westward expansion of the United States.

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Although earthquakes are not frequent in the District of Columbia, it is still possible to experience an earthquake. The District of Columbia can also experience shaking from earthquakes occurring in nearby areas.

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