I'd guess it's going to be well north of 60. The weather here has been HOT the past several days, with record highs 3 of the last 4. It's going to be topping 100 on Thursday in Provo. Good news is that the race-day high is predicted at 83, rather than the more extreme heat this week. That said, with the relatively shallow and silty water, the lake will warm rather quickly. 70 is possible, but mid to upper 60's more likely.

Outside of my guesses, I'm going to the lake tomorrow, and will take the temp and post the results. However, if someone already knows, and can save me the trip...please post it.