Originally constructed to supply the Wimmera-Mallee Domestic and Stock channel system, water held by Rocklands Reservoir is now used for many different purposes.

World War II caused construction to cease, and it was recommenced in 1950, with the dam being completed in 1953.

A 270-metre-long (890 ft) cement gravity dam forms the main wall, and is flanked by two embankment sections.

At 100% operating capacity, the dam wall holds back 261,510 ML (9.235 billion cu ft) of water.

It is also a popular fishing spot, with Murray cod, redfin, trout and carp taken at all times of the year.