25 U.S. Code § 1779d - Tribal trust funds
There are hereby established in the United States Treasury 3 separate tribal trust fund accounts for the benefit of each of the Indian Nations, respectively, for the purpose of receiving all appropriations made pursuant to section 1779c(c) of this title, and allocated pursuant to section 1779c(d) of this title.
Amounts in the tribal trust fund accounts established by this section shall be available to the Secretary for management and investment on behalf of the Indian Nations and distribution to the Indian Nations in accordance with this subchapter. Funds made available from the tribal trust funds under this section shall be available without fiscal year limitation.
The funds appropriated and allocated to the Indian Nations pursuant to section 1779c(c) and (d)  of this title, and deposited into trust fund accounts pursuant to subsection (a), together with any interest earned thereon, may be used for the acquisition of land by the Indian Nations. The Secretary may accept such lands into trust for the beneficiary Indian Nation pursuant to the authority provided in section 465 of this title and in accordance with the Secretary’s trust land acquisition regulations at part 151 of title 25, Code of Federal Regulations, in effect at the time of the acquisition, except for those acquisitions covered by paragraph (1)(B).
No money received by the Indian Nations hereunder may be used for any per capita payment.
Except as provided in this section and section 1779e of this title, the principal of such funds deposited into the accounts established hereunder and any interest earned thereon shall be invested by the Secretary in accordance with current laws and regulations for the investing of tribal trust funds.
The principal amounts of said funds and any amounts earned thereon shall be made available to the Indian Nation for which the account was established for expenditure for purposes which may include construction or repair of health care facilities, law enforcement, cultural or other educational activities, economic development, social services, and land acquisition. Land acquisition using such funds shall be subject to the provisions of subsections (b) and (d).
The Secretary shall disburse the funds from a trust account established under this section pursuant to a budget adopted by the Council or Legislature of the Indian Nation setting forth the amount and an intended use of such funds.
None of the funds made available under this subchapter may be allocated or otherwise assigned to authorized purposes of the Arkansas River Multipurpose Project as authorized by the River and Harbor Act of 1946,
 See References in Text note below.
 So in original. This section does not contain a subsection (d).
Section 1779c(c) and (d) of this title, referred to in subsec. (b)(1)(A), was in the original “sections 205(c) and (d)” and was translated as reading “section 605(c) and (d)”, meaning section 605(c) and (d) of Pub. L. 107–331, to reflect the probable intent of Congress.
The River and Harbor Act of 1946, as amended by the Flood Control Act of 1948 and the Flood Control Act of 1950, referred to in subsec. (b)(4), probably means the act July 24, 1946, ch. 596, 60 Stat. 641, known as the Flood Control Act of 1946, as amended by act June 30, 1948, ch. 771, title II, 62 Stat. 1175, and act May 17, 1950, ch. 188, title II, 64 Stat. 170. For complete classification of these acts to the Code, see Tables.