Tried my best today on this new route. There were 3 bridges that you see marked in the picture with the red arrows. I walked up the first two, which have a height somewhere north of 60' (dont trust GPS altimeter).
Strangely enough, I am not hurting. I had some mild discomfort from the stock specialized riva seat and an oddly aligned cleat which annoyed me. I made changes when I got home. Still, I feel like I could go ride another 10 no sweat. Ok, yes sweat. Lots of sweat. But still.