Most of what survives from Second Temple Jerusalem survives in fragments - a course of ashlar stone, a coin, a shard of painted plaster. The Pool of Siloam is not a fragment. It is a working piece of the city's plumbing and pilgrimage infrastructure, broad stone steps descending into a basin that once held the water pilgrims used to purify themselves before walking up to the Temple Mount. It sits exactly where the ancient sources say a pool at Siloam ought to sit, at the southern end of the City of David, and it was found not by a research excavation looking for it but by a municipal repair crew fixing a broken sewage pipe.
That accident of discovery is part of why the pool matters as evidence rather than as legend. Nobody went looking for a monument to confirm a story. A construction trench opened onto ancient steps, archaeologists were called in, and what emerged over the following seasons of digging was a public pool cut into bedrock and paved in stone, large enough to serve the crowds that the historical sources describe converging on Jerusalem for the pilgrimage festivals.
What was found
The exposed remains show a large, trapezoidal pool with wide, shallow steps running down at least two of its sides, built so that people of any height could descend to the water regardless of its level - a design shared with other Second Temple period ritual baths, but built here at a public, civic scale rather than a domestic one. The stonework and the pottery recovered from the fill date the pool to the late Second Temple period, the century or so before the Roman destruction of Jerusalem in 70 CE. Only a portion of the pool has been excavated. The rest lies beneath a planted area and adjoining property, and archaeologists have been clear that the full extent of the basin is larger than what is currently visible.
The pool was fed by water carried from the Gihon Spring, Jerusalem's principal water source since the Bronze Age, through the ancient tunnel system associated with King Hezekiah's preparations against Assyrian siege. By the Second Temple period that water, arriving at the base of the City of David, filled a pool positioned at the natural low point pilgrims would pass on their way up to the Temple Mount - a location that matches the pool's role in Jewish practice of the period, when ritual immersion was expected before entering the Temple precinct.
An accidental discovery
In 2004, workers repairing a sewage line in the City of David struck ancient steps. The Israel Antiquities Authority, notified of the find, opened excavations directed by Ronny Reich and Eli Shukron, who uncovered the stepped pool over the following seasons. The find was reported in the archaeological press and covered widely at the time as one of the more significant Second Temple discoveries in Jerusalem in years, precisely because it had not been anticipated by any prior survey.
Israel Antiquities Authority, City of David excavations, JerusalemThe debate over "the" Pool of Siloam
There is a genuine puzzle attached to the site, and it is worth stating plainly rather than smoothing over. A different pool, roughly two hundred metres away and long known to visitors and pilgrims, had already been identified for centuries as the Pool of Siloam - a smaller, Byzantine-period basin built beside a church commemorating the site. The newly exposed Second Temple pool sits lower down the slope, closer to the spring, and appears to be the older and larger installation, with the Byzantine pool likely representing a later, reduced successor built after the original had silted up or fallen out of use. Which pool best matches the "Pool of Siloam" named in ancient sources, and how the two relate stratigraphically, remains a live question worked through in the ongoing excavation reports rather than settled once and for all. What is not in dispute is that the newly exposed pool is Second Temple in date and was a major public water installation at the base of the city.
A stepped street has since been traced running from the area of the pool up the slope of the City of David toward the Temple Mount, excavated over more than a decade beneath what had been an orchard and residential plots. Its route and paving connect the pool directly to the pilgrimage route pilgrims would have walked, giving physical shape to a journey previously known mainly from texts.
A stepped street to the Temple Mount
Excavation beneath the modern surface of the City of David has traced a paved, stepped street running from the vicinity of the pool up toward the Temple Mount - a stone-built pilgrimage road wide enough for crowds, dated by coins and pottery in its construction fill to the decades before the destruction of the city in 70 CE. The road gives the pool a physical context beyond a single basin: a beginning point on a route that pilgrims are understood to have walked, on foot, up into the Temple precinct.
Israel Antiquities Authority, City of David excavations, JerusalemWhy it matters as evidence
The pool corroborates, in stone rather than in text alone, the picture of Jerusalem as a functioning pilgrimage city in the final century of the Second Temple - a place built with public infrastructure to receive large numbers of people who came to purify themselves and then walk up to worship. It is not a monument built to make a claim; it is a piece of civic plumbing that happened to survive, still connected to the spring that fed it and, increasingly, to the street that led away from it. That combination of an ordinary municipal function and an extraordinary religious purpose is what makes the site valuable: it is checkable, datable by the objects found in its fill, and visitable in situ, and it asks nothing of the visitor beyond what the stone itself shows.
Further reading
Story & Stone · Glass Case
See more objects: the Glass Case series →