Agreed crappie tend to over populate quickly although I've heard larger sized ponds/lakes are able to handle crappie without them over populating. But its very likely that crappie will end up getting stunted unless if you harvest thousand(s) of crappie. Also I wanted to ask why can't AR-Tenner not have a pond that could last up to 100 years? I know that's a very long time and lets say you build the dam in very good condition and you you put aeration to prevent muck and perhaps put bacteria to control perhaps any excess muck. Idk I feel like if you have the ambition you could make it work but I could be wrong.