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Show 640 of Engineers and the Secretary of the Army and also, in the case of privately owned highway toll bridges, by the highway departments of the state or states in which the bridge is situ- ated.797 Or if two or more state highway departments involved are unable to agree, by the Public Roads Administration.798 Also, the Chief of Engineers and the Secretary of the Army may impose such conditions relating to bridge maintenance and operation as they deem necessary "in the interest of navigation." In addition to control prior to construction, the Secretary of the Army has certain continuing authority with respect to river structures: in the regulation of tolls, the regulation of drawbridge operation, the maintenance of lights and signals, and the prescription of alterations to obstructive bridges.799 As to the latter item, it has traditionally been required that such alterations be made at the expense of the bridge owners.800 But two statutes with respect to certain bridges over the Co- lumbia River and in the Tennessee Valley provided that the cost be borne by the United States.801 In addition, a 1940 stat- ute with respect to railroad bridges provides for the sharing of costs by the bridge owner and the United States.802 Through review by the Chief of Engineers and the Secretary of the Army, and through the conditions which may be im- posed upon the approval of those officers, the construction of individual nonpower river structures can be better harmonized with river use by all persons for all purposes. In large measure, however, the statutes themselves and many responsibilities of the administering agency under other statutes place primary emphasis on protection and improvement of navigation.803 TOT See supra, pp. 113-114. 798 See supra, p. 114. 708 See supra, pp. 115-116, 115, 113,114-115. 800 See supra, p. 114. 801 See supra, pp. 114-115. 802 See supra, p. 115. 803 An exception to this statement is the 1906 statute specifying certain conditions which apply to the construction and maintenance of bridges authorized by Congress, including provision as to the movement of mail, troops and munitions of war and the use of bridges for telephone, telegraph, |