Environmental Whitewater Park opening and ProSeries February 11th, 2020 2003-11-13T00:20:31+13:00 [10 September 2003] All paddlers are welcomed to the opening of the Evironmental Whitewater Park (8 November 2003) below the Mangahao Dam near Shannon. The opening will include a slalom ranking race and selection for an Athens test event. Following weekends will feature six ProSeries races with cash prizes. Update: 13 November, John Snook advises the ProSeries races have been cancelled due to lack of interest. Kayakers are invited to make use of the water that will be flowing on 15, 22 and 29 November.