I was out of town. Didn't see your post until now.
I think it kicks up to 8-10%, but according to bike route toaster, the climb part is 3.17 miles, 503 ft of elevation gain. Can't be too bad, just pace yourself. It looks like it is steep at the beginning, then more gradual, the a steep part at the end.
There is a chance of rain now for Saturday morning, you going if it rains?