What’s the water temperature at Lucky Peak Reservoir in July?

Ever since the return of Ironman 70.3 Boise was announced, I’ve been wondering what the water temperature would be like on race day. I know in the previous iterations of this race, when it was in early June, it was a very cold swim: In 2011 the water temperature was 11°C, and in 2012 it was so cold, people wore wetsuits on the bike, which was shortened to 24 km. So far I haven’t been able to find…