Used to fish that area, but mostly around the island (on the marina side). Did venture up into Robinson Creek a few times, mostly hitting the first few creeks and pockets on the South bank. I think the first Black Crappie we ever caught from Green were caught in the back of one of those pockets, on a sand/pea gravel section of the pocket.
Now, I am talking decades ago, and always around the end of the third week of April ... so it was way before the KDFWR put in all those "fish attractors".
COE report says water temp at dam is 77deg (surface to 10') ... but, what was the temp up in Robinson ?? And did any of the fish still have any eggs, and if so what condition were they in ??