2005—Pub. L. 109–59 designated third sentence as subsec. (c), inserted heading, and substituted subsecs. (a) and (b) for first and second sentences which read as follows: “Where a proposed Federal-aid project is to be undertaken by a Federal agency pursuant to an agreement between a State and such Federal agency and the State makes a deposit with or payment to such Federal agency as may be required in fulfillment of the State’s obligation under such agreement for the work undertaken or to be undertaken by such Federal agency, the Secretary, upon execution of a project agreement with such State for the proposed Federal-aid project, may reimburse the State out of the appropriate appropriations the estimated Federal share under the provisions of this title of the State’s obligation so deposited or paid by such State. Upon completion of such project and its acceptance by the Secretary, an adjustment shall be made in such Federal share payable on account of such project based on the final cost thereof.”