Alas there is yet another player in this delineation game....the California Department of Fish and Game (CDFG). Their involvement, however, isn't nearly as easily described (at least for me) as that of the Corps or the CCC.
CDFG is involved primarily via the execution of "Streambed Alteration Agreements" through provisions of the California Fish and Game Code (Section 1600 et seq.). Streambed Alteration Agreements are required in certain instances for construction projects which would impact wetlands associated with rivers, streams or lakes. Fish and Game Code Sections 5650-5645 pertain to the protection of water quality, but do not charge CDFG with additional permitting responsibilities.