bill, had a half acre pond built this summer. it is about half full. i noticed the other day there was a crack on the top of the dam running parralel with the dam for about 30 feet. the crack is in the center. the top of dam is abuot 10 feet wide the crack was 2inch wide and went down a foot. it was in a spot my grass has not grown well yet. i was wandering how concerned i should be and how to repair it.there have been no leaks from where the water level is now about half way up the dam.