We have a lake that has a concrete low water crossing and concrete spillway. The spillway has a few cracks and we plan on power washing with the water being lower now and wonder what would be the best caulk to fill the cracks. Water will flow over it most of the time except during the hottest part of the summer. We were thinking Butyl caulk but aren’t sure. It does have some vertical drop so the self leveling type won’t work. Any help appreciated.

"Our Life is frittered away by detail. Simplify, Simplify" -Henry David Thoreau -