PUBLIC LAWS-CH. 694-JULY 29, 1946 Conveyances as provided in section 4 hereof. Any such agency is hereby authorized to convey to the State, or to the appropriate subdivision thereof, with- out cost, such easements and rights-of-way in its custody or over lands of the United States in its custody and control as may be necessary, convenient, or proper for the location, construction, and maintenance of the approach roads referred to in this section, including such road- side parks or recreational areas of limited size as may be deemed OfnenanceM etc. necessary for the accommodation of the traveling public. Any bridge constructed pursuant to this Act upon and across a dam in the custody and jurisdiction of any agency of the United States, including such portion thereof, if any, as may extend beyond the physical limits of the dam, shall constitute and remain a part of said dam and be main- Public se. tained by the agency: Provided,however, That any such agency may enter into any such contracts and agreements with the State or its subdivisions respecting public use of any bridge so located and con- structed as may be deemed appropriate, but no such bridge shall be closed to public use by the agency except in cases of emergency or when deemed necessary in the interest of national security. Recording of ex- SEO. 3. All costs and expenses incurred and expenditures made by any agency in the exercise of the powers and authority conferred by this Act (but not including any costs, expenses, or expenditures which would have been required in any event to satisfy a legal road or bridge relocation obligation or to meet operating or other agency needs) shall be recorded and kept separate and apart from the other costs, expenses, Restriction and expenditures of such agency, and no portion thereof shall be charged or allocated to flood control, navigation, irrigation, fertilizer production, the national defense, the development of power, or other program, purpose, or function of such agency. eibursement for SEC. 4 . Not to exceed $10,000,000 of any money heretofore or here- add itional costs. etc. after appropriated for expenditure in accordance with the provisions u23pU.s .c § 2 note; of the Federal Highway Act (42 Stat. 212), as amended and sup- Post, p . 86. plemented, shall be available for expenditure by the Commissioner of Public Roads in accordance with the provisions of this Act, as an emergency fund, to reimburse any agency for any additional costs or expenditures which it may be required to incur because of the design and construction of any such dam so that it will constitute and serve as a foundation for a public highway bridge upon and across such dam and to reimburse any such agency for any costs, expenses, or expenditures which it may be required to make in design- ing and constructing any such bridge upon and across a dam in accordance with the provisions of this Act, except such costs, expenses, or expenditures as would have been required of such agency in any event to satisfy a legal obligation to relocate a highway or bridge thApproriation au- or to meet operating or other agency needs, and there is hereb author- ized to be appropriated any sum or sums necessary to reimburse the funds so expended by the Commissioner of Public Roads from time Portion of bridge to time under the authority of this section. Of each bridge con- financed with Federal funds. structed upon and across a dam under the provisions of this Act, there may be financed wholly with Federal funds that portion thereof which is located within the physical limits of the masonry structure, or structures, of the dam, and the Commissioner of Public Roads shall in his sole discretion determine what additional portion of the bridge, if any, may be so financed, such determination to be final Portion financed by and conclusive. The remainder of the bridge, and any necessary state. related approach roads, shall be financed by the State or its appro- priate subdivision, with or without the aid of Federal funds; but said portion of the bridge so financed by the State or its subdivisions, including such portion thereof, if any, as may extend beyond the 710 [60 STAT.