I have a drainage easement on the side of my house. Sewer and power easement in back. 14' wide for each. My property runs into it 7', dead center. An easement is NOT public. It gives utilities that paid/set up the easement access to the infrastructure. I work for a water/wastewater utility. We pay for easements from landowners and developers. It does NOT make it public. Some associations will have easements to ponds and common areas that ARE public. Check your survey. If you own it, you can fence it. Be aware that you may need to move the fence for the entity that has the easement and for them only. If anyone else wants to use their easement they have to pay for the right.