"Bridge #6 - Rock Creek: Cast-iron 48" pipe lines to Gravity - 1859." Construction photo of Pennsylvania Avenue Bridge, 1859. Photograph courtesy Washington Aqueduct Division, U.S. Army Corps of Engineers - Pennsylvania Avenue Bridge, Spanning Rock Creek & Potomac Parkway, Washington, District of Columbia, DC

ID: 2844 ~ Source: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA ~ Date: 1859

This file appears in: Washington Aqueduct: The Washington Aqueduct was among the earliest major aqueduct projects in the country and still operates today.

This file appears in: Washington Aqueduct: The Washington Aqueduct was among the earliest major aqueduct projects in the country and still operates today.

Washington Aqueduct: The Washington Aqueduct was among the earliest major aqueduct projects in the country and still operates today.

By The DC Historic Sites team

One of the first major aqueduct projects in the United States, the Washington Aqueduct was commissioned by Congress in 1852, and construction began in 1853 under the supervision of Montgomery C. Meigs…