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DC
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For problems with accessibility in using figures and illustrations, please contact the DOC at 202-693-2020.

Investigation Of The September 7, 2011 Collapse of a Mobile Crane at the National Cathedral Site in Northwest Washington, DC

A 500-ton Liebherr mobile crane collapsed amid thunderstorms and heavy rain while it was being lowered to the ground. The crane's telescopic boom was 152 ft. and the attached lattice jib was 276 ft. long. The crane had been delivering materials over the cathedral building after earthquake damage. The crane tipped, overturned and fell its full length. One worker injured.
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For problems with accessibility in using figures and illustrations, please contact the DOC at 202-693-2020.

Investigation of November 19, 1990 Excavation Collapse at 14th and H Streets, N.W. Washington, D.C.

The structural steel support system of an open excavation, 150 ft. x 208 ft. by 47 ft. deep collapsed causing a cave-in of several thousand cubic yards of soil. The excavation was done for the construction of a 12-story office building with four levels of underground parking. The collapse caused the internal support system to slide and fall into the open excavation. At the time of the incident, construction had stopped for the day and therefore did not cause any death or injury, though it had significant potential for casualties.
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District of Columbia

County Area office
County Area office

District of Columbia

County Area office
County Area office

American Road and Transportation Builders Association (ARTBA) - SH-24861-SH3

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