It wasn't that hot. We started at around 6 AM and were back in the car by 10:30ish. The mountains cover up most of the sun, so it's cooler in the morning. I did go through a whole 2 liter Camelback and about one bottle of water, so plenty of water is needed for this ride.
According to my Garmin average temperature was in the 80s.
http://connect.garmin.com/activity/207053619

Here's one of me exiting a tunnel.
This one? Haha, from what I read, they used a singletrack to bypass one of the tunnels.
Riding with the edge on my right hand side always trips me out for some reason. I had no issues when it was on my left side while riding to the trestle, but was "on edge" on the way back.