Here is the spring with a fence around it, about 200 yard west of the other picture. That looked like a cottenwood tree to me in the other picture.
I can't believe that the first picture on the other post counts on the 500k.
I am 90% sure you are on to something. George Stewart took a photograph of Tie House and included it in his treasured US 40 book.
Frank Brusca has a terrific web site devoted to the highway at:
He is working on photographing some of Stewart’s sites. I hope you will contact him.
I have posted below Stewart’s photos and text about Tie House. I have examined the site in Google Earth and can easily ID the hill in the distance that shows in Stewart’s photo and the Stone House Well that is on the Delorme map. I am 90% confident that your photo was taken at the site of the Tie House and Plank Spring, so I hope you can return and see if you can match Stewart’s photo.
(BTW, your comment about photo storage is a long time problem, and the fault of the Invision folks who provide the forum host site, not American Road. There are some workarounds, but it remains a thorn)
Keep the Show on the Road!