This years problem with the DNR letting their lake dry up and kill the tadpoles before they develope enough to leave worked itself out due to heavy rains. As soon as the DNR let the water out, leaving only many puddles to dry out, heavy rain put close to a foot of water back in the lake. I visited it yesterday and it was full of nearly developed tadpoles. Next year will be another problem that I'll monitor. Thanks to all for the input!