Yan Yean Reservoir

In 1857, the Yan Yean Reservoir became a marvel of engineering, the largest artificial reservoir in the world. It marked a pivotal moment for Melbourne, a city transitioning from its humble beginnings along the Yarra River to a burgeoning metropolis. Yan Yean Reservoir, north of Melbourne, played a key role in this transformation. The reservoir’s creation was a response to the city’s growing pains. The Yarra River, once the primary water source, had become polluted. It was known as “Yarra Soup.” This prompted the construction of the Yan Yean Reservoir, a clean, reliable water source for the growing population. The dam itself is an earthfill embankment. Completed in 1857, it holds back an impressive 30,266 megalitres of water. This water, crucial for the city’s survival, spans an area of 560 hectares and is contained by a dam 10 meters high and 963 meters long. Originally, the Plenty River fed the reservoir. However, pollution from rural towns and livestock crossings compromised the water quality. A solution was found by diverting water from the pristine Wallaby Creek and Silver Creek. These creeks originate in the Great Dividing Range, feeding the Goulburn River. This water is captured in the Toorourrong Reservoir system and then flows to Yan Yean via an aqueduct. The construction of Yan Yean Reservoir transformed the surrounding area. A tent city of 1,000 workers, many returning from the goldfields, sprang up during the reservoir’s construction. This led to the development of the nearby neighborhood of Mernda, previously known as South Yan Yean. Yan Yean Reservoir remains a vital part of Melbourne’s water supply. It also offers a glimpse into the city’s history and its ongoing efforts to secure its future. A visit to Yan Yean Reservoir is a journey back in time. It is a reminder of the vision and ingenuity that transformed Melbourne into the thriving city it is today.