Hey RGG,
That's some good info for the folks IMO.
My eye is on Old River Morganza right now.
I looked at the Lake Pelba, Atchafalaya River at Butte Larose, and the ms. river at red river landing gauges of the last few days. Looks like as you said the Atch. river is 2 foot lower than Pelba, but the fall is very similar. The red river gauge shows 47,46.5,46.25, and 46.25 over the last four days.