Low Water dam All of them. You may need a permit from the Corps of Engineers to work on your own land. If your work is in a water area, or where water lays or runs just part of the year, your activity may be regulated by federal law. While it is easy to recognize lakes and rivers, and most people can identify a dry streambed, wetlands are not always as obvious.
Some wetlands have trees and appear to be dry most of the year.
Most people don't understand or recognize the limits of a wetland. If you intend to work in one of the areas described, you need a permit. If you work without a permit, you may be in violation of federal law. You need a permit too. Yes it does.