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612 spans is about four-fifths as tall as The Washington Monument
In other words, it's 0.82641 times the height of The Washington Monument, and the height of The Washington Monument is 1.2101 times that amount.
(Washington, D.C.)
The Washington Monument measures 740.550 spans tall, with some discrepancy due to the fact that the Monument's base is slightly below the surrounding ground. Interrupted in its construction by the American Civil War, it was almost 36 years between groundbreaking and the completion of construction.
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