I have a stream that goes through my yard. The ducks will go downstream a couple hundred feet. I don't mind, my neighbors don't mind, and the ducks for the most part always come back around dark. However this has been somewhat problematic since having snowfall- Last night I had to trudge through the snow downstream after dark to find and bring them back- since they seem to not mind being in the frigid water all day! But it is concerning to me in these temperatures.
I'd like to put a fence over and in the stream to stop them from going downstream. Any ideas or pictures would be helpful.
This is where I have to put a fence in (there is snow on the ground now)

I'd like to put a fence over and in the stream to stop them from going downstream. Any ideas or pictures would be helpful.
This is where I have to put a fence in (there is snow on the ground now)