Ind. Code § 8-10-1-18
All money received pursuant to the authority of this chapter, whether as proceeds from the sale of bonds, from revenues, or otherwise, shall be deemed to be trust funds to be held and applied solely as provided in this chapter, but prior to the time when needed for use may be invested to the extent and in the manner provided by IC 5-13-10.5, insofar as applicable. Such funds shall be kept in depositories designated as depositories for funds of the state as selected by the ports of Indiana, in the manner provided by the governing statutes in so far as applicable. The resolution of the commission authorizing the issuance of bonds or the trust agreement securing such bonds shall provide that any officer to whom, or any bank or trust company to which, such money shall be entrusted, shall act as trustee of such money and shall hold and apply the same for the purposes hereof, subject to the provisions of this chapter and of the authorizing resolution or trust agreement.
IC 8-10-1-18