At Casa Grande Arizona, a steel and concrete canopy was built in 1932 to protect what remained of the Great House from the elements.
As I mentioned earlier the great puzzle is why were these magnificent structures and elaborate towns abandoned in favor of smaller communities after about 1450 C.E.
Some have speculated that some catastrophe caused the people to leave. There is evidence that the area experienced significant floods between 1300 and 1450. Those were followed by intense periods of drought. Severe climate change in other words.
Archeologists use multiple kinds of evidence to answer such questions, or at least shed some light on the questions posed. As a result, they have been studying salt discharge on the Salt and Gila rivers, as well as the increasing soil salinity, diseases, and evidence of malnutrition. It is likely that environmental conditions changed and the Ancestral people of the Sonoran Desert (formerly Hohokam people) did what all smart people do, they adapted to changed conditions. That is how people survive. That is a lesson we moderns are beginning to experience. How will we adapt is not so certain.
The evidence does show that the extreme flooding deepened the Gila River Channel making it more difficult for canals to carry water to fields where water levels were low. Part of the canal system was abandoned while other parts were extended miles upstream to maintain proper water flows. Around 1350 C.E., the time of the Great House, a combination of factors may have triggered a breakdown of Hohokam society and undermined their leadership.
It is probable that as a result of all of these factors, the survivors of the floods and droughts abandoned large sites like Casa Grande in favor of smaller settlements along the Gila River. Today’s O’odham people believe that they are the descendants of the Hohokam people. As a result, Hohokam society never disappeared it just adapted and changed to a lifestyle that was better suited to the changed conditions. This change was likely to one more similar to their ancestors. They changed to a simpler life. Perhaps that is what we will be compelled to do.
There is a lot to be said for a simpler life.