2 April 1937 - Construction commenced
1938-39 - Picks and Shovel replaced by modern mechanised equiptment
19th October 1940 - First pipe laid for the Surrey Hills high-pressure system
1944 - Race completed
8 June - First power generated from Highbank power station
1978-79 - Sand Trap installed
June 1982 - First power generated from Montalto power station
1 October 1990 - The government transfers the ownership of the RDR to a user owned limited liability company called Rangitata Diversion Race Management Ltd