Burrendong Dam is a large dam ( capacity 1,190,000 Megalitres ) near Wellington which holds the waters of the Macquarie River and its tributaries the Cudgegong River and the Turon River to stop floods and provide water for irrigation . Burrendong Dam is a large dam ( capacity 1,190,000 Megalitres ) near Wellington which impounds the waters of the Macquarie River and its tributaries the Cudgegong River and the Turon River for flood control and irrigation .