Byron, nice tie. I'm assuming it's a size 14 +/-? I would trim the bottom hackle so this fly rides right in the surface film as that is how the naturals look when dropping those eggs in the evening. I also use a more greenish (chartreuse) color for the egg sack, but the one you show looks pretty good. Let us know how it works. That is a killer opportunity for some great fish, especially tight up against the dam in that slack-water eddy. Good luck.
Kelly.
Tight Lines,
Kelly.
"There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home."
Roderick Haig-Brown, "Fisherman's Spring"