Tums, I also have willows growing in my pond. I left them there when I built the pond. Mine are setting in 4' of water. I also have a water well for the pond. But it does not have near the volume u have.
I have sunk many a structure in the lakes I fish, Christmas trees, sweet gums, and willows. The willows will hold their leaves for months under water and they really keep the crappie close to the structure. I think you will have a great place to drown a minnow.
Tracy
