I stopped at the Tufts archive in Pinehurst last week and came across a routing with JB McGovern listed as the architect, dated Oct. 1947. The plan was listed under Green Oaks, because it is Green Oaks. The title says Westmoreland Country Club.
I found a Pittsburgh Press article from 1913 and 1914 that says "Donald Ross is expected in Pittsburgh this week. He will spend a few days at the Allegheny CC rearranging the course and will then go to the Westmoreland CC where he will lay out new holes and place the traps and bunkers."
It looks like the course opened sometime in the 1920's and JB McGovern's changes were not implemented.