Kalen,
I am looking at aerials from '37, '57, '66, '74, '80, '90, '96, and whatever date the latest Google map shows. What you believe to be the creek is actually just a line of conifers, the creek is located well to the other side (SE) of them. The cart path doesn't seem to have impacted the creek, although it does lie on roughly the same ground as the conifers. The biggest change to its bunker complex occurred between 1980 and 1990, but the present set is a Bill Love creation and more in line with what was there.