Archie, it would seem that this photo cooraborates the research behind Tom & Wayne's book, that this bunker was installed om response to the 39 US Open. I'd still love to learn how they got to par of 69.
The Club along with then pro Ed Dudley and his assistants were able to play the 12th and 8th holes with ease even during adverse weather conditions. It was determined that the holes would be "excellent" par 4's. Dudley and his assistants, although long hitters did not compare to the pro's who would be playing in the Open as so it was thought they could reach the green with a drive spoon. Memorandum from Club July 1939. In 1937 Flynn toured the course with suggested changes, some of which did include new tees and bunkers on a few holes.
"The Association is not making its first effort to halt the onslaught on "par". It changed the regulations for the ball, but manufacturer's met the change by introducing a ball capable of being driven farther. General Improvement of equipment has stimulated low scoring.
The 8th hole at Spring Mill, formerly a par 5, has been made a 479 yard par 4, and although even now long hitters will be able to reach the green with a drive and perhaps a No. 3 iron, the unit has been so trapped it will prove probably the most difficult of the eighteen.
No. 12 is the other hole to undergo a change. Formerly a par 5, it is now a par 4, which should force to good woods from any contestant. It now measures 480 yards, but the player will find his second shot must play to a green nestling at the top of a decided slope." Evening Public Ledger - January 4, 1939
July 12th, 1938 William Flynn toured the course and made recommendations for improvements to the course.