I hand dug a new shallow cove 10 days ago- specifically for BG spawning grounds. Dug it out knee deep, then put 8-10" of gravel back in. Within a week it was full of BG nests.
BG spawn multiple times when water gets above 70F, so you're surely there. Fry hatch in 5-7 days, stay in the nest a few days, then swim off.
I would think most middle TN ponds, the BG will want to spawn now unless they are still adjusting to new habitat.
