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Reflections on Archaeology in the District of Columbia
Today’s #SHA2016 blog post is a repost by Charlie LeeDecker, who recently retired from the Louis Berger Group’s Washington, D.C. office, in 2014. As the D.C. Office of Planning, Historic Preservation Office notes, Mr. LeeDecker spent the last 30 plus years conducting archaeological investigations for development projects and as a consulting archaeologist for federal agencies. He has worked on dozens of projects and in every ward of the District. On May, 6, 2015, Mr. Charlie LeeDecker received a District of Columbia Award for Excellence in Historic Preservation (HP) in the category of Archaeology for his body of work in the District. The post is his reminiscences on a career that focused on the buried history of our nation’s capital.
Original Blog Post by Charlie LeeDecker
Washington, D.C., is one of the world’s greatest cities, and it’s been a great privilege to pursue a career in archaeology here, working alongside a large community of talented, passionate, and creative historic preservation professionals. One of my long-time professional goals has been to gain greater visibility for city’s archaeological resources. When I look at an old building, a landscape or even a parking lot, I want to see beyond what is immediately visible, and learn how this particular place came to be what it is today, how it developed through history, and what can we learn from the values, struggles, and daily lives of the people who lived and worked here generations ago. The archaeological record is mostly hidden from view, especially in urban areas, and sometimes when we look below the surface we find amazing stories that entertain, enlighten, and enrich our understanding of how our city came to look like it does today.
The city’s natural waterways — the Anacostia River and Potomac River waterfront areas, even the valley of Rock Creek and the smaller tributaries that feed these waterways – were the first places settled by European colonizers, the sites of our earliest industries, and the favored locations for the camps and villages of Native Americans that lived here for thousands of years before the first European explored the Chesapeake. While these areas contain the richest record of cultural development, they area also the most challenging to investigate archaeologically. In these areas, the natural or historic landscape has been layered below occupied buildings, pavement, formal landscapes, and massive amounts of fill soils that are occasionally contaminated with industrial waste.
I’ve had the privilege of working for many years in the Washington Navy Yard and the Navy Yard Annex (now known as the Southeast Federal Center). First established in 1799, the Navy Yard has played an important role in our national security and the development of military technology, and the historical significance of the Navy Yard is recognized by multiple historic districts, including a National Historic Landmark designation. We know from archival sources that the Navy Yard might include an archaeological record of the site’s early industrial history, especially shipbuilding and ordnance development. But opportunities to conduct archaeological investigations in the Navy Yard are limited by factors such as a high water table and nearly ubiquitous occupied buildings and pavement.
The relocation of Naval Sea Systems (NAVSEA) Command to the Navy Yard required rehabilitation of many historic structures, along with demolition of some buildings and new construction. Impacts to the historic districts and buildings were evaluated prior to construction, but archaeological work was deferred until the construction phase. There are serious risks with this approach – risks that archaeological resources might be destroyed without adequate documentation, and risks that archaeological work might cause delays to the construction schedule. Managing these risks required an unusual level of partnership between the construction and archaeological teams, but ultimately, the risks were rewarded beyond anyone’s expectations.
Archaeological documentation in the interior of Building 104 at the Washington Navy Yard, during rehabilitation for the NAVSEA project
Some of the best opportunities for archaeological work occurred during the rehabilitation of historic buildings, after the interiors were gutted and the floor slabs were removed. At Building 104 we were able to document remains of the Brass Gun Factory, including features associated with furnaces and a casting pit. At another site, we found massive furnace foundations associated with the New Ordnance Foundry, a structure built during the Civil War to cast large, smooth bore cannon cast that were formed in a distinctive “soda bottle” shape, known as the Dahlgren cannon. We also documented remains of the West Shiphouse, a structure built around 1825 that was used for repair of 19th-century naval vessels. Reaching seven stories in height and extending over an area of roughly 100×300 feet, this shiphouse was one of the most prominent structures along the lower Anacostia River, visible in many nineteenth-century views of the city.
Much of my work over the last 10 years has been in and around the parklands in the city’s monumental core area, including the National Mall, the Ellipse, West Potomac Park, and the Washington Monument grounds. Historically, these iconic landscapes were originally low-lying tidal flats and open water at the mouth of Tiber Creek, a tributary of the Potomac that disappeared long ago. For thousands of years, Native Americans camped along the banks of the Tiber, and after the City of Washington was established in 1790, the creek was transformed first into a canal, then a foul sewer that carried the city’s waste into the Potomac. Tiber Creek and its banks were filled during the nineteenth century. Some of the filling was a result of efforts to improve the land around the White House but most of the fills – millions of cubic yards – was deposited during efforts to maintain the river’s navigation channels and control flooding that ravaged the city.
Some of the most interesting finds were unearthed along 17th Street. One of these was a wharf built in 1807 at the foot of 17th Street where it extended into Tiber Creek. The 17th Street Wharf was a shipping point for the early city, its importance growing after 1833, when it became a hub connecting the Washington City Canal and the Washington Branch of the C&O Canal. The wharf disappeared in 1902 when 17th Street was extended after land reclamation had been completed on Potomac Flats.
Documentation of the original foundation of the Lockkeeper’s House at 17th Street; the foundation wall is 11.5 feet below present grade and was preserved in place during a sewer line replacement project.
The Lock Keeper’s House that stands at the corner of 17th Street and Constitution Avenue gives a hint of how different today’s landscape is from that of the 19th century. The C&O Canal Extension followed the shoreline of the Potomac from Georgetown, ending at the 17th Street Wharf. At that point, a canal lock accommodated the changing elevation between Lock 1 in Georgetown and the tidal waters at 17th Street. When 17th Street was extended in 1902, the Lockkeeper’s House was moved about 50 feet, but its original foundation was left in place where it was exposed during the replacement of a sewer line. After exposure of the Lockkeeper’s House foundation, we should not have been surprised that the actual canal lock would be found a few feet away. Sure enough, as the tunnel for the sewer line proceeded beneath Constitution Avenue, there it was!
Perhaps the most spectacular find along 17th Street was the “Mother of All Sewers,” aka the Tiber Creek Sewer Outlet. As the city developed in the nineteenth century, the Washington City Canal became a major nuisance, essentially an open sewer that collected waste from much of the downtown area. In the 1870s the city began to cover the Washington City Canal, converting it to an underground sewer. Following the area’s natural topography and hydrology, the sewer outfall was located at the intersection of 17th Street and Constitution Avenue, where waste emptied directly into the Potomac. Like the 17th Street Wharf and the C&O Canal Extension, the sewer outfall was engulfed during the land reclamation process that led to the creation of West Potomac Park. Exposed during construction of the Potomac Park Levee, the sewer outlet was an immense structure, measuring some 40 feet across its headwall.
With these and the findings from many other studies, the understanding of archaeology in the District has been increasing. Some of my most satisfying projects have been those that presented the greatest challenges and that required strong partnerships among project proponents, review agencies, and construction teams. Without the commitment of all stakeholders, some of the city’s most interesting archaeological resources might have remained virtually unknown and forgotten. The amazing opportunities to document the historic foundries at the Navy Yard, the wharf beneath the pavement of 17th Street and the canal lock below Constitution Avenue would not have been possible under conventional archaeological survey methods and would not have happened without committed partnerships among all of the project stakeholders. Going forward, I hope that the preservation community will continue to challenge us to think creatively to search for new ways to bring the city’s archaeological heritage to light.
View of the headwall of the Tiber Creek Sewer outlet along 17th Street, NW. Exposed during construction of the Potomac Park Levee, the Lockkeeper’s House is in the background, at the corner of 17th Street and Constitution Avenue. Measuring 23.5 feet across and 13 feet in height, the outlet is large enough to accommodate two lanes of vehicular traffic.