it would tend to make me think your lake is void of a thermocline since it's really just a wide spot in the Brazos river for the most part and the river has been cooking most of the year so far .
crappie in there can be tough in the summer months best I can remember ,might be hanging on the river channel ledges in depths around 15 to 20 ?
try some of the standing wood in there along the southwest shoreline , north of 377 maybe , probably holding some fish along that timber line on the outside edge towards the old river channel maybe ?