Evans v. Tenn. Valley Auth. , 922 F.2d 841, 1991 WL 1113, at *2 (6th Cir. 1991) (unpubl.) (discussing United States ex rel. Tenn. Valley Auth. v. An Easement & Right-of-Way , 182 F. Supp. 899 (M.D. Tenn. 1960)); cf. Monongahela Nav. Co. v. United States , 148 U.S. 312, 344 (1893) (“doubtless the existence of [a] reserved right to take the property upon certain specified terms may often, and perhaps in the present case, materially affect the question of value”).