Hi again everyone. To answer some questions....
I have completely shut off my power and it still exists.
It seems to almost be time related , 10 pm - till? Maybe the power demands at those times?
These are big high tension power lines. They cross the property I live on and if walk up and put my head on the pole it sounds the same for the most part.
It is louder inside my cabin than outside. Windows open or closed dont seem to make a difference.
I was thinking some sort of pump or generator possibly.
I live up in the mountains near Aspen, Co. I dont know that anyone else has complained. I asked my brother who had visited a couple weeks prior and he thought he had heard it.
Right now from about 10:30 pm to now 11:15 it was louder and now it is subsided a bit.
Anyhow maybe Ill buy the Bose aviator noise canceling earbuds.....
Thanks everyone for all the suggestions, and humor.