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Show 639 facilities within and between regional power districts which it was directed to establish, but which have not yet been created.790 Relative Spheres of Federal and Nonfederal Development.- In the matter of regulation, even more significant is the possi- bility of a conflict between a proposal to license a nonfederal project and another proposal for federal construction of a sim- ilar or conflicting project. This difficulty is well illustrated by reference to an example previously set forth.791 The origin of the difficulty lies in the failure of statutes in specific instances to define clearly when a particular development may be under- taken only by the United States or by others under license from the United States. Thus, much of the controversy in the ex- ample centers around the meaning of the word "approved."792 Nonpower River Structures.-Nonpower structures in navi- gable streams and other obstructions to navigation are subject to the regulatory jurisdiction of the Chief of Engineers and the Secretary of the Army and also, as to some structures, to the consent of Congress.793 As to bridges, dams, dikes, and causeways, an 1899 Act requires generally both the consent of Congress and the approval of plans by the Chief of En- gineers and the Secretary of the Army prior to construction.794 But bridges, dams, dikes, and causeways may be built,under state authority in waterways, the navigable portions of which lie wholly within a single state, if the location and plans are first approved by the Chief of Engineers and the Secretary of the Army.795 Furthermore, under the 1946 General Bridge Act, Congress granted blanket consent for the construction, maintenance, and operation of bridges over navigable waters of the United States, subject to stipulated conditions.796 The location and plans must still be approved, under the 1946 Act, by the Chief 780 § 202 (a), as added by Act of August 26,1935, 49 Stat. 838, 848,16 U. S. 0. 824a(a). See also supra, p. 287. 791 See supra, pp. 440-441. 792 See supra, pp. 440-441. 798 See supra, pp. 113-118. 784 See supra, pp. 113,116. 796 See supra, pp. 113, 116. 798 See supra, pp. 113-114. 911611-51------42 |