Lake
Parramatta Dam was the first large dam built in Australia, only the 11th arch
dam built in the world, and the only ashlar masonry arch dam built in
Australia. ('Ashlar' means stones hewn to rectangular shapes). This engineering
marvel is highly regarded by engineers around the world. The Parramatta Dam is the second example in the
history of the world of a dam built using mathematical calculations and a
curving wall – the first dam built in this manner is only 1 year older than
Parramatta Dam. Parramatta Dam is a masonry arch-walled dam across Hunts
Creek. It
was constructed of solid sandstone quarried from the creek. Each block was
carefully dressed to accurate dimensions and laid in courses 0.6m high. The dam
wall extended about 4m into the abutments on each bank. It was completed in 1856 to supply water for domestic purposes; and was
operational until 1909. In 1920s and 1930s dam was a popular bathing and picnicking
spot. Now the dam is used for Water storage.
The
people of Parramatta had been asking for improved water supplies almost since
the town was founded in 1788 – while the river originally was wonderfully
clean, soon after settlement the surrounding trees were cleared and run-off and
sewage pollution left the river dirty. Wells
provided some townspeople with water and a public well was built in June 1815, however
most Parramatta residents relied on water carts for their water, which would
deliver water from the Parramatta river to storage cisterns at the houses. By the 1850’s the river was often polluted by
sewage and the water was unpleasant, and a Committee of Water Commissioners was
established to determine how to provide the town with good clean water. Choosing Hunts Creek rather than Toongabbie
Creek, in 1851 the Commissioners recommended constructing a dam and piping water
to homes. Percy Simpson’s design was chosen,
builder of Oatlands House and the Great North Road, and now Parramatta is
blessed with an engineering marvel, the arch wall dam on Hunts Creek, at beautiful
Lake Parramatta.