I'm not sure it matters if Oakmont had 312 bunkers (which appears here on GCA), or the 350 range. Arthur A. Snyder, father of my mentor, Arthur J. Snyder, worked for Henry Fownes in 1907 and built several per month while he was on the crew. Arthur often told me they would built several every month, and Mr. Fownes would keep adding them. Who knows? There is a great photo on the wall at East Lake, presented to bobby Jones, that shows a massive amount of bunkers...from the 1930s as I recall.
At Peacock Gap's 18th hole (San Rafael, CA) I placed a small bunker about 235 yards from the tee, in the center of the landing area between the left edge of the dog-leg par-4 and a linear canal hazard at the right. The new owner did not like this at all, complaining that "it was right in the middle of the fairway", to which I said he had many options — play short of it, play left, try to out-hit it...or, take the dangerous route to thread the needle between the bunker and the canal at the right. He insisted that he 'always went into the bunker." I think my reply was perhaps not ideal when I sad, "Wow, that's a consistent game..."