Cal. Wat. Code § 123
Except as provided in Section 179, the department succeeds to and is vested with all of the powers, duties, purposes, responsibilities, and jurisdiction in matters pertaining to water or dams vested in the Department and Director of Public Works, the Division of Water Resources of the Department of Public Works, the State Engineer, the Water Project Authority of the State of California, or any officer of employee thereof. The department also succeeds to and is vested with all of the powers, duties, purposes, responsibilities, and jurisdiction of the Department of Finance under Part 2 (commencing at Section 10500) of Division 6. The department succeeds to and is vested with all of the powers, duties, purposes, responsibilities, and jurisdiction vested in the State Water Resources Board, except as provided in Article 2 (commencing at Section 150) of Chapter 2 of this division.
Any commission or other body heretofore or hereafter created by the Legislature to formulate a compact with a similar commission or body from another state relative to the distribution and use of the waters of any interstate streams or bodies of water, including but not limited to the California Klamath River Commission and the California-Nevada Interstate Compact Commission, shall, in formulating a provision in any such compact for the administration of the terms of the compact, provide that the Department of Water Resources shall be the representative of the State of California for the purpose of such administration.
Ca. Water Code § 123