Keven,

Both my ponds are excavated as opposed to embankments so I cannot address the issue of whether or not crawfish will burrow through a dam but I'll pass along my experiences with crawfish. Most of the crawfish I see in my one pond make their burrows on land within 6-8 inches of shore. I've never really measured the depth of the hole but I suspect its not more than 6-7 inches deep in addition, there is a mud mound 3-4 inches tall, which is created by the spoils from burrowing. I would guess they burrow enough to hit moist soil. I don't see what benefit there would be for them to burrow further.

Given that most dam thickness is measured in feet, I suspect crawfish would not be a threat to the integrity of a dam. Hopefully some other members will sign in with their opinion.

Russ