Warren,
Nice picture and interesting history. Until about 13 years ago Cottonwood, a small town about 20 miles South of here had a similar tower except it was built of wood and never had the castle like top. But instead of preserving it, they argued about it until it finally collapsed and they had to remove it. There was an door at the bottom and the insides were covered by shingles. Inside was an old wooden stairs that went up to the big wood tank and I think it only held about 60,000 gallons but made a good picture. Now I can't find one of them to save my life. That is an old cow town and they still have the hitch rings and places where they had to tie their horses when they came into town to the one saloon.
Ron