We were required by state law (due to EPA "clean water" regs) to fence off the stream preventing access of the sheep to the stream. The Bay Foundation provided us with money to help cover the cost of the fence in return we are giving up use of pasture along both sides of the stream (stream buffer) and additional pasture on the other side of the stream on which they will be planting native trees and shrubs. We will be responsible for preventing invasive plant species from taking over these new trees and shrubs.
We are not supposed to spray, we can occasionally graze (not easy since the sheep will want to browse the leaves), and access to mow is more difficult than we thought it would be. So I guess "free" may not be the right term (TANSTAAFL); we will not be buying the trees and shrubs.