Where, in the opinion of the Secretary, a right of way or easement of any kind over public land is required in connection with a project the Secretary may reserve the same to the United States by filing in the Bureau of Land Management and in the appropriate local land office copies of an instrument giving a description of the right of way or easement and notice that the same is reserved to the United States for Federal irrigation purposes under sections 371, 376, 377, 412, 417, 433, 438,1

462, 463,1 466, 473,1 474,1 478, 493, 494, 500, 501, and 526 of this title, in which event entry for such land and the patent issued therefor shall be subject to the right of way or easement so described in such instrument; and reference to each such instrument shall be made in the appropriate tract books and also in the patent.