Hello, thanks for the responses. There is a levy at one end of the pond. Raising the levy is not an option as it will just cause the pond to spread to nearby lowlands, not really make it deeper. I was hoping to make it deeper so it was suitable for ice-fishing, and perhaps to introduce trout.
The pond has a very large flow-through of water, so it won't go dry.
It is similar to a "long ditch" It is 2000+' long and between 100-200' wide, with one end being very shallow.
