Oregon Revised Statutes Property Rights and Transactions § 105.910

(a) A legal description of the real property benefited and burdened by the easement;

(b) A description of the dimensions of the easement sufficient to determine the horizontal space across and the vertical space above the burdened property that must remain unobstructed;

(c) The restrictions placed upon vegetation, structures and other objects that would impair or obstruct the wind flow across and through the easement; and

(d) The terms or conditions, if any, under which the easement may be changed or terminated.