Design and Facilities
The centerpiece of the Aqueduct is a 12-mile (19 km) pipeline which connects the system's dam at Great Falls with the Dalecarlia Reservoir on the border with Montgomery County, Maryland. The pipeline runs along what is now MacArthur Boulevard, traversing some of the higher cliffs along the Potomac River.
The Union Arch Bridge carries the pipeline and MacArthur Boulevard over Cabin John Creek and the Cabin John Parkway near the community of Cabin John, Maryland. This bridge was the longest masonry arch bridge in the world for 40 years after its completion.
The Dalecarlia Reservoir serves as a primary sedimentation basin. A portion of the water from the reservoir is treated at the nearby Dalecarlia Water Treatment Plant and distributed to municipal water mains. The remainder of the water from the reservoir flows to the Georgetown Reservoir in Georgetown. This facility serves as an additional sedimentation basin, and then the water flows through the Washington City Tunnel to the treatment facility at the McMillan Reservoir, after which it is pumped through city mains.
Read more about this topic: Washington Aqueduct
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