43 C.F.R. § 429.35 – May I appeal Reclamation's final determination?

(a) Yes, if you are directly affected by a final determination, you may appeal by writing to the Commissioner within 30 calendar days after the postmark date of the Regional Director's determination letter.
(b) You have an additional 30 calendar days after the postmark of your written appeal to the Commissioner within which to submit any additional supporting information.
(c) The Regional Director's final determination will remain in effect until the Commissioner has reviewed your appeal and provided you with that decision, unless you specifically request a stay and a stay is granted by the Commissioner.