(a) That portion of the North Umpqua River between Soda Springs Dam and the confluence of the North Umpqua River and South Umpqua River; or
(b) The main stem Umpqua River from the confluence of the North Umpqua River and the South Umpqua River to the ocean.
(2) Nothing in this section applies to the repair, structural repair, maintenance or improvement of any dam constructed on the North Umpqua River prior to November 1, 1981, with the approval of the Water Resources Commission and the State Department of Fish and Wildlife. The commission and the State Department of Fish and Wildlife shall not unreasonably withhold or delay such approval, but may withhold approval for reasonable cause, including but not limited to a substantiated finding that the repairs, structural repairs, maintenance or improvements:
(a) Fail to comply with applicable safety rules or regulations;
(b) Raise the height of the dam; or
(c) Diminish the current ability of anadromous fish to travel past the dam.
(3) No person shall appropriate and no officer or agency of this state shall issue or approve any license, permit or certificate for the use of water for hydroelectric generation at a dam at the location referred to in subsection (1) of this section. [Formerly 541.875]