In years past, one of my best crappie spots was a pool on a small stream w/ a bridge. The logs, brush, etc that floated down stream would be stopped by the bridge columns - the fishing was super. It was made all the better by the laydowns from the banks (public park) - once one knew what to look for and time of year, more quality fish.
Then along came DOT and the park department - between them, they ripped out all the snags on the bridge, and the lay downs. There are still fish there, but not the numbers or quality.
The first time I fished it after the rip-out, I could have cried. Enjoy it while it lasts, cause it may not.
UG