Whenever, by the agreement of the States concerned and the consent of Congress, an interstate compact comes into operation, it has the same effect as a treaty between sovereign powers. Boundaries established by such compacts become binding upon all citizens of the signatory States and are conclusive as to their rights.[1798] Private rights may be affected by agreements for the equitable apportionment of the water of an interstate stream, without a judicial determination of existing rights.[1799] Valid interstate compacts are within the protection of the obligation of contracts clause and specific enforcement of them is within the original jurisdiction of the Supreme Court.[1800] Congress also has authority to compel compliance with such a compact.[1801]
ADDENDUM
Nor may a State read herself out of a compact which she has ratified and to which Congress has consented by pleading that under the State's constitution as interpreted by the highest State court she had lacked power to enter into such an agreement and was without power to meet certain obligations thereunder. The final construction of the State constitution in such a case rests with the Supreme Court.[1802]
Notes
[1] 4 Wheat. 316, 405 (1819).
[3] 206 U.S. 46, 82 (1907).
[4] 4 Wheat. at 407.
[5] Ibid. 411.
[6] Ibid. 421.