Survey Data

Reg No




Categories of Special Interest

Architectural, Historical, Technical

Original Use


In Use As



1855 - 1875


321433, 201699

Date Recorded


Date Updated



Single-stage stone-built ‘valve’ tower sited within the Vartry Reservoir, constructed c.1865. The tower was built to give access to underground draw-off pipes, which stretch from the reservoir itself through a dam to the treatment plant on the other side. The tower is constructed in squared rubble with roughly fashioned granite quoins, and is topped with a crenellated parapet. There is a metal sheeted door to the south face of the tower set within a pointed arch recess with granite dressings. The tower is accessed via an iron girder bridge comprised of twin latticed trusses with parabolic curved top chords, which in turn is accessed from the side of the dam via a tower-like gateway, similar in style to the valve tower itself. The tower is set roughly 30m into the reservoir.


This tower and bridge are both part of the first purpose-built reservoir designed to supply the City of Dublin and as such are of historical importance.