As I read further, this claim gets to be somewhat comical:
1. From the Adare Golf Club in Ireland:
"This was the last
major golf course designed by the legendary Robert Trent Jones, Senior."
2. From playagrande.com:
"On the western coast, Robert Trent Jones built his final golf course."
3. And the wikipedia entry referenced by Craig previously:
"For example, his last design, The Marshes in Ottawa, Canada."
More images from the course...
Whether it was RTJ's last or 3rd from last, it looks quite beautiful there...I'll plan to take my camera in February.