Will have to contact state or local laws for easement. Usually up to the actual "property owner" to maintain. Following state / local codes / laws. Basically anything that impedes flow, needs to be address. Other than that you are not bound to anything.
In rare occasion the "user" has to maintain. Again will have to contact state / local, for codes / laws...
In rare occasion the "user" has to maintain. Again will have to contact state / local, for codes / laws...