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