I have not been down there since early January but I would think the fish are still up in the creeks. Maybe the upper third not sure on that maybe someone else can chime in. You may be able to catch threadfins and gizzards up at the very backs of the creeks.

There has been a lot of snowmelt and rain so some creeks could be trashed up pretty good and likely more so at the head. If that's the case sometimes it gets down to fish where you can. Which may be mid creek or if the wind is blowing good and blowing the trash over to the side you might be luck.

I'm not sure about catching alewives under lights this time of year as I have not done that much but if are going to try I might go halfway up the creek put the light out in about 60 feet of water. That's a guess. Your graph can tell you where to put the light out.

Good luck