Does your property have any areas currently defined as wetlands? I'd assume so given the cattails in the pictures, but that's not always the case. I know making any changes in defined wetlands is challenging, but there are some federal and state programs that might allow for improvement and expansion of the wetlands.
I had approval from one government agency to build a dike that would dramatically increase the size of an existing wetland. I believe it was the NRCS and they were going to pay for the project. The corps of engineers and DNR needed to sign off to move forward, but even though both agreed it would increase wetland acreage and benefit wildlife, it wouldn't be allowed since the dam would be across an existing wetland and therefore not allowed.
I'm interested to see what you turn your new property into - it could be quite a wildlife magnet eventually.