History for the Clyde Dam By _lucy_ Nov 9, 1945 Investigations begin Investigations begin about whether the Clutha River could potentially be dammed. Nov 9, 1948 Construction/building of the Roxburgh dam begins. Nov 9, 1959 Lake Hawea control dam is complete and put into use. Lake Hawea control dam is complete and put into use. Lake Hawea rises by 20m.