“As Above, So Below. As Within, So Without.”
There are miles of old abandoned water tunnels directly under a lot of Alefantis’s properties of interest. The picture above is of workmen in one of the tunnels circa 1900s.
First off there is a bit of background on the tunnels then there’s a map outlining all the properties of interest in relation to the tunnel network. I’ve also included examples of some of the tunnels discovered.
The Washington Aqueduct, managed by the U.S. Army Corps of Engineers, provides wholesale water treatment services to DC Water and its partners in Northern Virginia, Arlington County and Falls Church. – DC Water
- Built in 1864 by Montgomery Meigs and the Army Corps of Engineers.
- The Washington Aqueduct forms the central node in DC’s water infrastructure.
- Water splits into a set of parallel conduits and is gravity fed 9 miles from Great Falls, Maryland to Dalecarlia Reservoir.
- Water continues under Reservoir Road near Georgetown Reservoir and Glover Archibald Park.
- The aqueduct crosses Rock Creek Valley inside the Pennsylvania Avenue Bridge structurally supported by two 48-inch (122cm) arching water pipes.
- The conduits then begin to branch out in a network of smaller and smaller pipes that eventually connect with individual houses.
- In total 12 miles of conduit, 11 tunnels, 6 bridges, pump stations, pipelines, and 2 reservoirs were built. – National Park Service
Note that just before the aqueduct crosses Rock Creek it branches off left into Georgetown.
- In the mid-1920’s a second conduit was added to increase the capacity of the system – National Park Service
The conduit is the largest structure of the water system. It stretches almost 12 miles downriver from the intake at Great Falls to the Georgetown Reservoir. The circular tube, built of brick, stone and mortar, is 9 feet in diameter. It was constructed by tunneling and by deep rock cuts. A road was built parallel to the conduit to facilitate cleaning repairs and inspections. The road was originally named Conduit Road, today it is MacArthur Boulevard.
The Washington (Lydecker) Tunnel, completed in 1901 by the Army Corps of Engineers, is up to 10 meters in diameter and runs 4 miles from Georgetown Reservoir to McMillain Reservoir. Shortly after in 1926 a second tunnel was dug beside it.
- Within a decade the District’s population had increased by 75% and it was clear that a larger system was necessary.
- The Army Corps of Engineers’ proposed the McMillan reservoir NE Washington
- In 1882 Major Garret Lydecker started building a 4 mile long tunnel connecting the new McMillan Reservoir (east) with the existing Georgetown Reservoir (west).
- The project was marred in corruption. Eventually Lydecker received a court-martialed for his role in the fiasco and was banished to the Rocky Mountains.
The Washington Post describes the reality: “A committee of experts went through the tunnel and found that instead of a solid lining, thousands and thousands of feet of the tunnel contained nothing more than a brick arch, with spaces between the sides and the top of the arch and the original rock large enough to drive a coach through.”
- The Army Corps of Engineers finished the tunnel by 1901
This map shows the proposed route of the Washington Tunnel.
The Army Corps added the McMillan Park Reservoir and the Washington City Tunnel (10 meters in diameter and 4 miles long) between 1882 and 1902.
A second tunnel paralleling the original was completed in 1926 which allowed the Lydecker Tunnel to be periodically closed for routine maintenance without noticeably interrupting water service.
In the Widows Mite air shaft just north of Wyoming Avenue, near the line of Twenty-second Street, the official section shows a capping of “clay and sand 30 feet thick” underlain by 35 feet of “clay,” but this is undoubtedly a mistake, as the gneiss has been revealed by many cellars in this vicinity under only a few feet of terrace gravel and sand. In the air shaft on the highest part of the ridge near the corner of Sand Thirty-fifth Streets the blueprint of the tunnel section shows 42 feet of “clay” lying on “soft rock” at a depth of 158.7 feet, but in fact the rotted bedrock out-cropping extensively in that area is overlain by very thin remnants of terrace gravel at 195 feet above sea level. Probably the clay referred to is mostly rctten rock.
Merging the two maps produced this.
2. Alefantis (Metro Interiors)
The Washington (Lydecker) Tunnel – Air Shafts
These are approximated positions based on the maps.
A. S St & 35 St
- 3509 S St, NW, Washington, DC 20007
B. Widows mite Shaft
C. Champain avenue Shaft
D. 13th street shaft. 200ft North of Florida Avenue
2 newspapers refer to 2 different addresses below:
2115 P St, NW
Workmen found a tunnel on P Street when digging foundations for Pelham Courts Luxury Appartment block Now Hotel Palomar
Pelham Courts Apartment block/Hotel Palomar 2121 P St, NW
while working on the foundation for the luxurious Pelham Courts apartments in Dupont Circle, workers made an unusual discovery: “Workmen find tunnel The passage is more than 100 feet long. (Washington Post, 5/19/1917)”
So do the tunnels themselves, which fan out as far as 200 feet behind his old Dupont Circle home, though they’re now sealed with concrete.
The Pelham Courts of Dupont Circle are long gone, and the property now houses the Hotel Palomar. Reference
Tunnel appeared Behind Pelham Courts
“Washington was alive with stories of mystery, intrigue, romance, and adventure.” (Post, 3/4/1942)
While driving behind Pelham Courts in mid-September of 1924, a truck’s tires sank into the ground, revealing the entrance to a hidden underground shaft. Reference
I conclude from my research there are many tunnels under Washington DC. The ones outlined above are ones we know about. Some are as old as 1850s. As demand for water increased they built new tunnels and laid new pipes. The older tunnels being left to decay.
Interestingly here are 4 properties that sit directly on top of the old aqueduct tunnels. Most of the properties in Washington sit above some form of a tunnel or another but it seemed quite a coincidence that the only map I could find of the aqueduct system of tunnels was from 1900s and Alefanis etc have properties either very close or right on top of them. The articles point out the tunnels aren’t that far from the surface so digging down from any building wouldn’t be a great challenge. You would just need to know where to dig.