The line extended from the Rockdale end of the Arncliffe sewerage farm (enlarged for the scheme) to the sewer penstock at Premier Street, Marrickville.

The bridge spans are of mild steel riveted construction, the sewer carrier pipes being carried on cross beams on two simple lattice girders (on trusses), with a series of small cross lattice girders for wind bracing.

Access to this viaduct in general is difficult, and the exact configuration of the structure not easy to determine, but the carrier emerges from a brick northern abutment below Unwin Street, Undercliffe (known as Unwin's Hill) crossing the creek by the steel trusses and then continuing by the brick arches passing under the East Hills railway to arches and embankment at Turrella and Knoll Streets, Turrella.

The aqueduct is a large and impressive built structure situated across the expanse of the Wolli Creek valley.

[1] The barrels were overhauled between 1981 and 1984, and the surface of the cast iron pipes was coated with a modern fibre-glass lining.

[1] As at 22 June 2005, the Wolli Creek Valley sewage aqueduct was an integral and visibly strong component of the original Western Main Carrier (now part of Southern and Western Suburbs Ocean Outfall Sewer System), which was one of the Board's major early sewerage schemes.

The two original sewer carriers are likely to be rare examples of large diameter, long run wrought iron pipes used for such a purpose.

Elements of significance are its past and ongoing use, technologies of construction, and setting within the valley of Wolli Creek.

[1] Wolli Creek Aqueduct was listed on the New South Wales State Heritage Register on 18 November 1999 having satisfied the following criteria:[1] The Wolli Creek sewage aqueduct is an integral and visible component of Western Main Carrier system which subsequently evolved into the Southern and Western Suburbs Ocean Outfall Sewer System.

[1] The arches of the aqueduct are excellent examples of decorative face brick (in a basically utilitarian structure), which are unlikely to be built again.

[1] This Wikipedia article was originally based on Wolli Creek Aqueduct, entry number 01355 in the New South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 under CC-BY 4.0 licence, accessed on 2 June 2018.