All dams, dikes, and other water conservation and flood control works or devices constructed within any district, unless specifically exempted, are under the jurisdiction of the water resource board for the district within which the dam, dike, works, or device exists or is to be constructed. The district’s jurisdiction over the dam, dike, works, or device does not affect the commission’s or department’s authority relative to the dam, dike, works, or device. No changes or modification of any existing dams, dikes, or other works or devices may be made without complying fully with the provisions of this chapter.