In driving past Salt Lake City, I noticed that the hills around there have some steps in them, evidence of former higher water levels, and the Wikipedia page talks about how it was much much bigger long ago. So the area around there is drying out, and has been for a while.
The doorways are really short, about 4 ft tall in most places, and it baffled me because they used these buildings for ceremonial reasons mostly (according to the signs) and I would figure you would want to have high doorways for a church. Also, the way they built, with the wooden beams for archways, is easier if you have less sitting on the wood, so higher doorways would be better. The rooms are standing height.