We have a small creek that crosses the edge of our property, and splits the adjacent 5 acre parcel pretty close to the road. The owner looked into building on the property, had it tested, etc. He then found out that to build a bridge over that creek was going to be prohibitive, and there isn't enough room in front of the creek for a house. The creek is Great Lakes drainage, and the bridge has to be built to DOT standards...ouch. My other neighbor owns the lot across the street, and the creek crosses that as well....ten years ago he built a conforming bridge, and it cost him $10K...that would be double, or triple now.