; of which such amounts as may be necessary may be advanced to the Colorado River Dam Fund: Provided , That such transfers may be increased or decreased within the overall appropriation under this heading: Provided further , That of the total appropriated, the amount for program activities that can be financed by the Reclamation Fund or the Bureau of Reclamation special fee account established by 16 U.S.C. 6806 shall be derived from that Fund or account: Provided further , That funds contributed under 43 U.S.C. 395 are available until expended for the purposes for which the funds were contributed: Provided further , That funds advanced under 43 U.S.C. 397a shall be credited to this account and are available until expended for the same purposes as the sums appropriated under this heading: Provided further , That of the amounts provided herein, funds may be used for high-priority projects which shall be carried out by the Youth Conservation Corps, as authorized by 16 U.S.C. 1706 . Central valley project restoration fund For carrying out the programs, projects, plans, habitat restoration, improvement, and acquisition provisions of the Central Valley Project Improvement Act, $62,008,000, to be derived from such sums as may be collected in the Central Valley Project Restoration Fund pursuant to sections 3407(d), 3404(c)(3), and 3405(f) of Public Law 102–575 , to remain available until expended: Provided , That the Bureau of Reclamation is directed to assess and collect the full amount of the additional mitigation and restoration payments authorized by section 3407(d) of Public Law 102–575 : Provided further , That none of the funds made available under this heading may be used for the acquisition or leasing of water for in-stream purposes if the water is already committed to in-stream purposes by a court adopted decree or order. California bay-delta restoration (including transfers of funds) For carrying out activities authorized by the Water Supply, Reliability, and Environmental Improvement Act, consistent with