Willow Creek Winter Stock Water Supply Act

Willow Creek Winter Stock Supply Act - Authorizes the Secretary of the Interior to make payments to certain claimants in full settlement of all claims against the United States relating to the loss of winter stock water from Willow Creek, Idaho.

Requires the Secretary to make such payments only if: (1) the claimant notifies the Secretary of his claim within one year of the enactment of this Act; (2) the claimant provides an affidavit providing his use of such water prior to December 31, 1979; and (3) the claimant executes a satisfactory waiver and release of all claims against the United States relating to such water.

Sets forth procedures for the determination of payment eligibility and amount.

Authorizes appropriations.