Twenty-one of the roof beams in Spruce Tree House have been dated by
tree-ring chronology. These dates show that the houses were
constructed during the years between 1230 A.D. and 1274 A.D. In 1276
A.D. a 24-year period of drought began that caused the cliff dwellers
to move to regions where there was a more permanent supply of water.
In those same regions are the homes of the modern Pueblo Indians and
no doubt some of these people are the descendants of the cliff
dwellers.