Mundaring Weir is the name of a dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

 (and historically the adjoining locality) which are located 39 kilometres (24 mi) from Perth, Western Australia

Perth, Western Australia

Perth is the capital and largest city of the Australian state of Western Australia and the fourth most populous city in Australia. The Perth metropolitan area has an estimated population of almost 1,700,000....

 in the Darling Scarp

Darling Scarp

The Darling Scarp, also referred to as the Darling Range or Darling Ranges, is a low escarpment running north-south to the east of the Swan Coastal Plain and Perth, Western Australia...

. It is situated in the Mundaring

Mundaring, Western Australia

Mundaring is a suburb located 34 km east of Perth on the Great Eastern Highway. The suburb is located within the Shire of Mundaring.The Aboriginal name of the area 'Mindah-lung', said to mean 'a high place on a high place', was anglicised to become 'Mundaring'.The Mundaring area is also considered...

 locality. The dam crosses the Helena River

Helena River

The Helena River is a tributary of the Swan River in Western Australia. The river rises in country east of Mount Dale and moves to the north west to Mundaring Weir, where it is dammed...

.

The town of Mundaring was gazetted in 1898, the same year as the commencement of construction of the dam.
A soldier, Ensign Robert Dale

Robert Dale

Lieutenant Robert Dale was the first European explorer to cross the Darling Range in Western Australia.Robert Dale was born in England in October 1812...

, became the first European to explore the region in 1829.

European populations did not grow significantly until construction of the dam in the late 1890s.