Wellington Weir Valve House

The Wellington Dam (historically referred to as Wellington Weir) and the original Harvey Weir (submerged largely by the modern Harvey Dam) are the cornerstone historic water and irrigation assets in the South West of Western Australia.

The Wellington Dam was built on the Collie River in 1933 during the Great Depression by sustenance workers.

Enlarged significantly with the help of post-war European immigrant workers who raised the wall height to 34 meters and length to 366 meters. By 1960 the capacity of the dam was 185 gigalitres and it served as an irrigation and regional drinking water source.

Tree-clearing in the Collie River catchment during the 1960s and 1970s caused rising salinity levels that led to its retirement as a primary municipal drinking water source by 1990.

A massive 2021 mural titled Reflections transformed the wall into a major landmark.