Sean,
The photos were taken this morning, July 15, 2012.
The course opened in July 1926.
So, for 86 years it would appear that the turf has survived Mother Nature's whims quite well.
Donnie Beck can answer your question directly and precisely, but, my take, based upon the photos and the fact that the course has survived the last 86 years, is that the course, today, is not close to the danger zone of losing the turf.
Does that surprise you ?
Josh,
What you missed and continued to miss is the fact that despite the heat and lack of rain, some courses are nothing but lush, dark green with NO hint of discoloration.
What does that, or rather what should that tell you ?
To me, it seems to indicate overwatering.
What does it signify to you if there's no evidence of any color other than lush, dark green ?
Second question:
Are you telling us that you're incapable of maintaining a golf course in any condition other than lush, dark green ?
Even when Mother Nature is assisting you ?