Mr. Wallace, in Arkansas there are over 20 different species of Goldenrod. Some species like wet soil while others like dry, well drained soil. In the US, there are over 100 species.
In Arkansas the goldenrod blooms from July through Sept on average. This day, today, my bees are packing in pollen, several different shades of color, even though we had 3/4" rain this morning. Go figure, I would think the pollen would have been washed off the flowers.
I'm sure in your area there will be some, at least some goldenrod, remember some species like moisture. 70 inches is awesome, maybe to awesome, I agree. However goldenrod is a prolific plant producing lots of both nectar and pollen as you probably already know.
Have you noticed bees bringing in pollen lately??? I would say in my area, N Arkansas, the fall flow has started, judging by my bees packing pollen.
Blessings