23 CFR § 771.129 - Re-evaluations.
The Administration must determine, prior to granting any new approval related to an action or amending any previously approved aspect of an action, including mitigation commitments, whether an approved environmental document remains valid as described in this section.
(a) The applicant must prepare a written evaluation of the draft EIS, in cooperation with the Administration, if an acceptable final EIS is not submitted to the Administration within three years from the date of the draft EIS circulation. The purpose of this evaluation is to determine whether or not a supplement to the draft EIS or a new draft EIS is needed.
(b) The applicant must prepare a written evaluation of the final EIS before the Administration may grant further approvals if major steps to advance the action (e.g., authority to undertake final design, authority to acquire a significant portion of the right-of-way, or approval of the plans, specifications and estimates) have not occurred within three years after the approval of the final EIS, final EIS supplement, or the last major Administration approval or grant.
(c) After the Administration issues a combined final EIS/ROD, ROD, FONSI, or CE designation, the applicant must consult with the Administration prior to requesting any major approvals or grants to establish whether or not the approved environmental document or CE designation remains valid for the requested Administration action. These consultations will be documented when determined necessary by the Administration.