The Deer Creek Open Water Marathon Swim is the only open water swimming event in Utah (not including open water triathlons). The date has been set for this year's event and will be held on Saturday August 15, 2009. With 1 mile, 5K, 10K, and 10 mile distances, there is something for everyone. Having participated for the first time last year, I am excited to swim again this year. The venue is perfect and most of the course is protected from boats.
The Deer Creek swim was noticed by the 10K Swimmer blog (an excellent source of information about open water swimming throughout the world). Click here to see what they said about the event.
Also, here is a video documenting the first swim which was held two years ago.