In 2017, Philadelphia crews digging up Spruce Street hit water mains made of bored logs, laid around 1811; the city's last wooden pipe left service in 1858

A city worker operating a backhoe on Spruce Street in 2017 expected to find broken concrete and old cast iron. Instead, they found what looked like tree trunks and logs: water mains bored and buried around 1811, decades before the Civil War. The workers nearly tossed the logs in the trash, but a passerby stopped them.

A bike lane detour led to a 200-year-old discovery

The bike lane on the 900 block of Spruce Street was blocked for utility work, and a passerby, Julie Snell, was forced to walk her bike along the sidewalk when something at the excavation site caught her eye. She noticed what looked like a tree stump, but something about it seemed unusual. As an arborist, Snell analyzes tree silhouettes as part of her work. She had also heard from Adam Levine, a historical consultant at the Philadelphia Water Department, about the wooden pipes that served as Philadelphia's first water mains. She located him and emailed him right away. The Philadelphia Water Department credits that email with saving the pipes from being tossed out with other construction debris.

Records inside Philadelphia's water archive confirmed the pipes' age

Levine and Mike Schramm, a construction engineer for PWD, visited the site and verified that the logs were indeed water mains, not just old scrap wood, according to the water department's own account of the discovery. Then Levine visited the department's archives, which contain over 30,000 historic artifacts, and located a Watering Committee report for November 1812 showing pipes being laid in that block between October 1811 and October 1812. That date makes the pipe one of the oldest sections of Philadelphia's public water system, which first went into service in 1801 at the Center Square Water Works, once located where City Hall now stands. Fairmount Water Works, built years later specifically to replace the unreliable steam-powered Center Square system, had not opened yet. The wood did not last long. According to city records, they first laid cast iron pipes alongside wooden pipes in 1819, and after 1832, all newly laid pipes were cast iron. This section was replaced by a 12-inch cast iron pipe in 1831. The last piece of wooden pipe in the entire system was removed in 1858.

Bored logs made sense for an early American water system

Although wooden main pipes seem archaic, they were a practical solution because the country did not yet have enough industrial capacity to manufacture iron pipes. Workers drilled a hole through each log and fit the smaller end of one pipe into the hollow end of another, allowing water to flow by gravity through the line. Philadelphia was not the only city to build this way. Other early American cities, including New York, built similar wooden water systems around the same period.

New York uncovered a similar piece of its own water history

In 2006, during a routine replacement of a main in Lower Manhattan, workers stumbled across two sections of wooden pipe dating from the early 1800s. The pipes formed a 26-foot section of the city's original water distribution system. The New York City Department of Environmental Protection has since donated the two sections to the New-York Historical Society for public display. The department's 2013 announcement of that donation states that the two sections are the only known complete segments of wooden water main in any New York City collection.

Lead pipe replacement is the latest chapter in this story

Wood was eventually replaced by iron; in many cities, iron was later replaced by lead, which remained common for decades until its toxicity was recognized and other materials took its place. The legacy of lead pipes remains, however, and that legacy is currently being removed. Under the Environmental Protection Agency's Lead and Copper Rule Improvements, finalized in October 2024, systems nationwide were required to complete initial inventories of their service line materials, and the final rule requires them to fully replace lead and certain galvanized service lines within a 10-year window. According to the U.S. Environmental Protection Agency, there is no safe level of lead exposure via drinking water, so the rule is mandating system-wide replacement of lead service lines, not just partial replacement. Homebuyers today may receive a notice under the rule indicating whether their service line is lead, galvanized, or unknown.

Philadelphia turned the salvaged pipes into a teaching tool

The recovered pipe sections were not discarded in a landfill or sold. PWD kept the artifacts for educational display, as is standard procedure for the department's archive, which it adds to whenever residents or contractors stumble upon something notable. Buried for two centuries, some sections of the wood were well preserved enough for the department to remove intact, according to its own account of the find. What started as Snell double-checking her instincts has preserved a piece of Philadelphia's early infrastructure and suggested that more may still lie buried beneath the city.