The design provided for an aqueduct to "connect the second and third divisions of this sewer where it crosses the tidal waters at the head of Mosman Bay".

The design of a steel parabolic arch of 43 metres (140 ft) span was evidently determined by need to provide a structure "in such a way as to be no disfigurement to the locality (and) for convenience of foot passengers, a bridge will be built on top of the aqueduct."

[1] An arched steel aqueduct built for the purpose of enabling water mains to be carted over a gully, linking Avenue Road and Bay Street Mosman.

[1] In 1968, maintenance and up-grading works were commenced and consisted of the addition of 2,530-millimetre (100 in) pipes and the replacement of the slats of the timber footbridge with concrete block paving.

[1] As at 21 April 2005, the Mosman Bay Aqueduct over Reid Park, completed in 1901, was a magnificent piece of Federation era engineering constructed from imported steel.

The structure is a key element in the historic built environment of the lower north shore, and continues to serve as a pedestrian right-of-way.

[1] Mosman Bay Sewage Aqueduct was listed on the New South Wales State Heritage Register on 18 November 1999 having satisfied the following criteria.

The Mosman Bay Aqueduct over Reid Park completed in 1901 is a magnificent piece of Federation era engineering purposely and attractively set within a public reserve.

The siting of the aqueduct within a reclaimed public reserve is representative of other items of Water Board infrastructure located on the lower north shore.