That's a small steep dam!
Where on the dam are the poplars located? This is the Tulip poplar? The roots from 2 mature poplars will pretty much consume that small of a dam!
Poplars don't do well with trimming but I think I would take Theo's advise & try topping them maybe half way up & keeping them trimmed.

If not trimmed when mature they will have huge tap roots & will send out roots as big as your arm 50' from the trunk.


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Ric