How deep are the springs?

I don't know for sure but if I had to say probably 15 16 ft to the bottom of the Blue Springs pool as far as the cave I have no idea

Im not sure exactly, but the benches around the edge are deep enough that the water is up to my thighs. My husband went to the middle and the water was over his head. At the far end where the water goes to meet the river, I could wade in on a slope and towards the middle was to my hips