If it ever cuts loose there will be an epic flood. Did the Beaver Inspectors ever get a look at it? After all Size isn't everything. How many logs went into that thing anyway? Was it checked for strength, flexibility under loads, ability to hold back before gushing? This could be pretty important for anyone below it. Canada's National Honour could be at stake!
I'm sure the beavers appreciate your input. Let me assure you, extensive thought goes into dam design.