Miss 7 knows what a lock is. She had fun with a computer game which showed how locks work and she knew which buttons to press in order for the water to go in and out and allow the boat to use the next part of the river with a different water level. Miss 12 remembered going through the lock last time we were in Mildura. Miss 7 doesn't remember going through the lock but she had fun describing how a lock works to Miss 12. I'm not very good at technical descriptions and explaining things clearly so I'm just going to quote from another website.
Lock 11 and Mildura Weir - Mildura's Chaffey Trail
"Lock 11 & Mildura Weir
Weirs and locks have been an important way of regulating the Murray River's water supply for many years.
Before settlement, the Murray River ebbed and flowed and sometimes flooded or dried up completely. Its lack of reliability caused problems for early settlers, who relied on the river for transporting cargo such as wheat, wool, wine grapes and citrus to market.
George Chaffey was the first person to see the river's irrigation potential, describing it as a 'river of life'. In 1887 a paddle steamer carrying WB Chaffey moored at the Murray's bank and 500 men were working in the town a year later.
River traffic declined with the opening of the railway in 1903 but the river's depth and health were foremost in people's minds. In 1914, the Commonwealth, Victoria, New South Wales and South Australian governments signed an Agreement to manage the river's waters by building locks, weirs and storage areas. Construction of the Mildura Weir began in August 1923 with the aims of raising both the water level and the pressure from the Mildura and Red Cliffs irrigation pumps. Lock 11 was completed in 1927.
Did you know?
- The difference between the river levels upstream and downstream of the Weir is normally 3.6 metres
- The river steamer PS Canally was first to pass through the lock on 2 August 1927
- The Mildura Weir system is the only site on the River Murray where a lock and weir are separated by an island."
There's lots of other interesting info and photos on the website as well.
The PS Melbourne is the only paddle steamer in Mildura which is powered by a steam engine.