Heading back in for another look...
Thank you everyone who has contributed to this thread (everyone but Springfield..)- you have given me fresh ideas and kept hope alive I may someday decipher the meaning of this carving. It's amazing how a rock in the middle of nowhere can weigh on the mind for so many years.
It has been over 5 years since I have been to this location but God willing I am returning for more reconnaissance next week, I intend to take many more photos of the carved rock, surrounding rocks and the vantage points they create, measurements of the carving, height above ground etc., and I will try the water idea as well thank you desertmoons. There is a water tank not far upstream from this carving and an old miners cabin about a mile downstream so I know people have have lived recently in the area. I simply cant imagine anyone would carve this with no purpose, and yet the symbol seems so simple. It is puzzling to have thought so much, yet know so little about this piece of lost desert art.
Through the years I have asked many people for their opinions of the symbol with astonishingly little feedback. Some people deny it even looks carved. My top theories so far are:
1st- It is a map or visual representation of a rock outcrop/formation or other marker ahead, possibly also giving distance and direction.
2nd- The symbol represents a snake or other animal which provides insight into the nature of cache/shelter/water source and may provide distance/direction
3rd - It was carved by miners in the area as a type of grubstake
4th- It was carved by Native Americans for unknown reasons.
These are listed in order of hopefulness, not likelihood.
Any thoughts, ideas or prayers for when I relocate the rock are much appreciated- thanks TTH!