Kevin, Thanx for those notes.
Interesting they are described as diagonal. As I recall from 10 years ago, the 3 had evolved (or was changed) into one. Mostly vertical to the line of the hole, on the left side, with a couple of lobes that oriented towards the fairway. These lobes may have been those diagonals.
From the picture, it sure looks like three bunkers up there, but the farthest one, could be much closer to the green than the other two which look like they are on the hillside. Or, at least near the top of that rise which is pretty close to the 150 mark.