The way I see it you have three options. One is to build the land bridge and cut your pond in half and increase your degree of difficulty on the engineering side. Another option is to drive around the pond in what most people would call the conventional, easy method. Extra driveway expense but less intrusive to the body of water in question. The best option, IMO, is to install a "Chunnel" under the pond. There is precedent for such a project, and it only cost $17.6 Billion. This sounds way more cool to me. And if the French can do it....
