The Manly Dam Reserve, also known as the Manly Warringah War Memorial Park, is an urban bushland reserve located in the Northern Beaches region of Sydney, Australia. The reserve adjoins the south-eastern edge of Garigal National Park. Located within the reserve is the dam reservoir. The heritage listed dam wall was designed and built in 1892 by the NSW Department of Public Works. The dam wall is located just outside the boundary of the reserve and is owned by Sydney Water. There are a number of Aboriginal heritage sites in the reserve. Dam The reserve is centred on a man-made reservoir known as Manly Dam; formed by the construction of a gravity dam across the Curl Curl Creek. Curl Curl Creek was originally dammed in 1892 to create a reservoir with a capacity of to provide a permanent supply of fresh water for the nearby village of Manly. The original high dam wall was subsequently raised in 1909, 1914 and 1922 to a final height of , increasing the capacity to . However, as the population of the area grew, the dam's capacity became insufficient. Water supply from Manly Dam had been augmented with supply from the main metropolitan system starting in 1906, initially from Mosman reservoir. By 1928 it was realised that Manly Dam had reached its limits and all future expansion would rely on the main metropolitan system. A trunk main was therefore laid from the Pymble reservoir and pumping from Manly Dam ceased in 1933. Briefly in 1942 after a period of drought, pumps were reinstalled and Manly Dam was brought back into service for nearly 10 months. In the early 1990s engineers installed a large enclosed powered propeller against the dam wall on the reservoir side to prevent silt building up against the wall and causing damage to the structure. The propeller's purpose is also to prevent stratification of the water body, thereby improving the water quality by preventing eutrophication. The dam wall is listed on the New South Wales State Heritage Register, however it is outside the boundary of the reserve and its management remains the responsibility of Sydney Water. War memorial Manly Dam was established as a War Memorial Park after World War I. A committee of ex-servicemen were given the responsibility of managing the bushland catchment of Manly Dam around 1920. The Manly Warringah War Memorial Park holds particular significance in remembering fallen