Mundaring Weir is one of the world's greatest engineering projects. Completed in 1903, the Weir was the start of the water pipeline, designed by C Y O'Connor, that pumped water 700 kilometres to the Kalgoorlie goldfields. This is a popular day trip destination and there is plenty to fill your day. Mundaring Weir is located in natural bushland in the Perth Hills and there are a number of bushwalking trails you can enjoy before settling down for a picnic and exploring the herit