Colo. Rev. Stat. § 23-15-122
The authority may invest the proceeds from the sale of a series of bonds or any funds related to the series in such securities and other investments, whether or not any such investment or reinvestment is authorized under any other law of this state, as may be provided in the proceedings under which the series of bonds are authorized to be issued, including but not limited to the following: Bonds or other obligations of the United States; bonds or other obligations, the payment of the principal and interest of which is unconditionally guaranteed by the United States; obligations issued or guaranteed as to principal and interest by any agency or person controlled or supervised by and acting as an instrumentality of the United States pursuant to authority granted by the congress of the United States; obligations issued or guaranteed by any state of the United States or any political subdivision of any such state; prime commercial paper; prime finance company paper; bankers' acceptances drawn on and accepted by commercial banks; repurchase agreements fully secured by obligations issued or guaranteed as to principal and interest by the United States or by any person controlled or supervised by and acting as an instrumentality of the United States pursuant to authority granted by the congress of the United States; or certificates of deposit or time deposits issued by commercial banks or savings and loan associations that are insured by the federal deposit insurance corporation or its successor. The authority may invest any other funds in the securities as provided in this section and with such maturities as the authority shall determine if such maturities are on a date or dates prior to the time that, in the judgment of the authority, the funds so invested will be required for expenditure. The express judgment of the authority as to the time that any funds will be required for expenditure or be redeemable is final and conclusive.
C.R.S. § 23-15-122