White's Creek Aqueduct is a heritage-listed sewage aqueduct at Piper Street, Lilyfield, Inner West Council, Sydney, New South Wales, Australia. It was designed by engineer William Julius Baltzer of the New South Wales Public Works Department and built by the Department from 1897 to 1898. The property is owned by Sydney Water. It was added to the New South Wales State Heritage Register on 18 November 1999. History Lilyfield was first developed as large rural estates granted to prominent early settlers between 1794 and 1819. The area comprising the subject site was part of 165 acres granted to John Piper in 1811. Like many original grantees here, Piper did not occupy the land. In the 1870s intensive subdivision of the large Leichhardt estates began. By 1875 the main street network, including White Street and Piper Street, was firmly established. Lilyfield however remained a suburban frontier until the early 20th century. During the 1880s Sydney was expanding rapidly due to the boom conditions and large influx of immigrants. Public works, such as water supply and sewerage schemes, were a major feature of these hectic years. When the large sewer main was planned in 1883 to drain most of the suburbs on the southern side of the harbour to the Bondi Outfall, it was found necessary to carry a branch sewer to service the western areas. On 25 April 1892 the Minister for Public Works resumed a parcel of land (2 roods and 29 perches) on the southern side of Piper Street for carrying out the upstream extension of the Northern Main Sewer. The Whites Creek sewer aqueduct was completed in 1897. It was constructed as an extension of the Bondi Ocean Outfall Sewer, then known as the Northern Main Sewer. This carried sewage from the densely populated inner-western suburbs of Balmain, Annandale and Glebe. The sewer necessitated the crossing of the 'Johnstone's Creek Valley' and 'White's Creek Valley' to deliver the sewage to the ocean outfall junction at the Junction of Parramatta and City Roads. The Main Northern Sewer was one of the Board's major early sewer systems. The section of Northern Main Sewer, which embraces the aqueducts across Johnstone's and White's Creeks, was constructed under Government Contract No. 77 (basically the area between Catherine Street and Minogue Crescent). The design work for this contract was completed by early 1895. This proposed a sewer carrier supported on mass concrete and brick