61 STAT.] 80TH CONG. , 1ST SESS.-CH. 411-JULY 31, 1947 of the Chief of Engineers based on the recommendation by the Board of Rivers and Harbors in the review of a report or reports authorized by law, expend such sums as may be necessary for the maintenance of harbor channels provided by a State, municipality, or other public agency, outside of harbor lines and serving essential needs of general commerce and navigation, such work to be subject to the conditions recommended by the Chief of Engineers in his report or reports thereon: Provided further, That not to exceed $3,000 of the amount herein appropriated shall be available for the support and mainte- nance of the Permanent International Commission of the Congresses of Navigation and for the payment of the expenses of the properly accredited delegates of the United States to the meeting of the Con- gresses and of the Commission. Alteration of bridges over navigable waters: For payment of the share of the United States of the cost of alteration of bridges over navigable waters in accordance with the provisions of the Act of June 21, 1940 (Public Law 647), $500,000, to remain available until expended. FLOOD CONTROL Flood control, general: For the construction and maintenance of certain public works on rivers and harbors for flood control, and for other purposes, in accordance with the provisions of the Flood Control Act, approved June 22, 1936, as amended and supplemented, including printing and binding, and office supplies and equipment required in the Office of the Chief of Engineers to carry out the purposes of this appropriation, and for preliminary examinations, surveys, and contingencies in connection with the flood control, $246,072,825, of which $200,000 shall be made available for the preparation of detailed plans for the Dyberry and Prompton Reservoirs in the Lackawaxen River Basin, Pennsylvania, recommended for construction in the report of the Chief of Engineers, United States Army, in House Document Numbered 113, of the Eightieth Congress and the prep- aration of such plans is hereby authorized: Provided, That funds appropriated herein may be used for flood-control work on the Salmon River, Alaska, as authorized by law: Provided furlthr, That funds appropriated herein, not to exceed $5)00,000, mlly be used for necessary bank protection on the Missouri River in thle vicilaitv of Aten, Nebraska: Provided further, That funds appropriated herein may be used to execute detailed surveys, and prepare plans and specifications, necessary for the construction of flood-control projects heretofore or hereafter authorized or for flood-control projects considered for selection in accordance with the provisions of section 4 of the Flood Control Act approved June 28, 1938, and section 3 of the Flood Control Act approved August 18, 1941 (55 Stat. 638): Provided further, That the expenditure of funds for completing the necessary surveys shall not be construed as a com- mitment of the Government to the construction of any project: Pro- vided further, That no part of this appropriation shall be available or used to maintain or operate the Garrison (North Dakota) Reservoir at a higher maximum normal pool elevation than one thousand eight hundred and thirty feet, or for constructing dikes or levees which would be required by a higher maximum normal pool elevation than one thousand eight hundred and thirty feet for operating such dam: Provided further, That in the construction of the Fort Gibson flood- control project in Oklahoma, the Chief of Engineers is authorized and directed to cooperate with the officials of the city of Muskogee in protecting the domestic water supply of such city. 95347 0 °-8 --pt. 1-44 689 Permanent Interna- tional Commission of the Congresses of Navigation. Alteration of bridges. 54 Stat. 497. 33 U. S. C. §§511- 523. Construction and maintenance. 49 Stat. 1570. 33 U. S. C. §§701a- 701f, 701h. Dyberry and Prompton Reservoirs. Salmon River, Alaska. Inllk protection, AInli, Nebr. Surveys, plans, etc. 52 Stat. 1216. 33 U. S. C.C 7011, 702a-l%, 702a-12 . Garrison Reservoir, N. Dak. Fort Gibson project, Okla.