Yanco Weir, heritage-listed weir in Yanco, New South Wales, Australia

Yanco Weir is a heritage-listed weir on the Murrumbidgee River about 14 km downstream of Narrandera, built 1928–29 to divert water into the Yanko, Colombo and Billabong creeks. It measures 75.59 m between abutments, with a concrete sill floor and concrete piers about 3.58 m high. Concreted over around 1980, it is no longer in operation; the grounds retain poles for manual gate operation and scales marking past flood levels.

Built in 1928–29 by WC & IC, the weir diverted water from the Murrumbidgee River into the Yanko, Colombo and Billabong creeks for irrigation. In 1980 it was reconstructed and its diversion capacity enlarged to 290,000 megalitres a year, boosting irrigation along the creeks. A new weir was then erected nearby and the 1929 structure was concreted over and taken out of service.

The weir reflects how the community transformed the landscape to support farming and settlement. For local residents, it represents a shared effort to manage water and build prosperity in a semi-arid region.

The 1929 weir stands about 14 km downstream of Narrandera, roughly 13 km west of town, on the Murrumbidgee River. The old structure is no longer in operation and has been concreted over, so look for the remnants on its immediate grounds: gate-operating poles and scales marking past flood levels. A new weir erected nearby around 1980 now handles the diversion.

The 1929 weir was concreted over around 1980, when a new weir was erected nearby at the diversion point, and it is no longer in operation. Around the old structure remain the poles used for manual operation of the weir gates and scales recording past flood water levels.