The Manhattan Island Marathon Swim has become a fixture on New York's summer calendar and a dramatic symbol of the improving water quality of the waterways that surround the city.
On 20th July, 1997 superfish Tammy van Wisse won the 16th annual swim round Manhattan, covering the 48 kilometres (and dodging passenger ferries and flotsam) in a time of 7 hours, 15 minutes and 57 seconds.
With Dawn Fraser on her support boat offering encouragement, van Wisse beat an international field of 47 competitors, finishing almost 3 minutes ahead of second place getter David Quartermain. Back to Manhattan
Tammy returned to New York again in 1999 and produced a record breaking time of 6 hours 51 minutes, beating home arch rival, Susie Maroney.
In a rare head-to-head clash, van Wisse emerged from the Hudson 24 minutes ahead of Maroney, who finished a disappointing eighth, but was unable to catch American Tobie Smith.
Van Wisse was full of praise for the winner. "Wow, that's just an amazing time for Tobie," she said. "I'm really really happy to finish second and the time's especially pleasing because I had a difficult build-up to the race."
Both Smith and van Wisse finished well inside Susie Maroney's race record of 7.00.27, set in 1990. Tammy Stars in Manhattan Relay 23rd June 2001 - Marathon swimmer Tammy van Wisse returned to New York to compete in an "all girl" relay team as part of the 20th Anniversary of the Manhattan Island Marathon Swim. 
With unusual conditions for the annual 48km Manhattan race, which saw the event stopped twice due to lightning storms, the all-female relay team comprising of Aussies Tammy van Wisse and Shelley Taylor Smith took line honours in a little over 7 hours. Tammy and Shelley were thrilled with the result, but not so with the water quality. Sighting dead rats, condoms and other debris floating by, both women suffered from gastro after the marathon event. 
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