Tom MacWood,
Many old structures had cornerstones or date plates indicating the year of completion.
When I"m there next I'll look to see if there are any date markings. It's reported that the lake was created in 1915-1916.
Perhaps it was this late date that allowed the 14th and 15th holes to take form.
The electricity generated by that dam and water wheel structure were used to power the clubhouse and other facilities.
It's a clever idea, a twofer, create ponds/lakes for the golf course and generate power for the club.
If you look at the schematic below, you can see how the routings attempt to avoid that area since it was deemed swamp.
Someone, cleverly dammed the area, created holes within it and the capacity to generate power for the club.
It would seem that the individual who came up with the idea leading to the dual usage should get significant credit.
Supposedly, the genesis for the 14th and 15th holes was Crump's discovery/alteration in 1915 of the site for the 13th green, which led tot the reconfiguration of # 14 and # 15.
Could the creation of the lake and the resiting of the 13th green be connected in terms of the final routing ?
Perhaps the delay in holes 12-15, primarily 14 & 15 was the time necessary for the lake to form.
If the project to create the lake was undertaken in 1915-1916, perhaps it took a year or more for the lake to mature into its final configuration, World War I might have influenced the pace of development/construction as well.
Crump's resiting of the 13th green could have triggered the need to dam the outfall and create a lake, and new holes along with it.
In viewing some 1922-1925 ground and aerial photos, I noticed how dense the trees in the non-cleared areas surrounding the corridors of play are.
In addition, it's apparent that the height of many trees is well over 40', even in the cleared areas.