The department of public works shall deposit in the state treasury funds received pursuant to La. Rev. Stat. 2:84 and La. Rev. Stat. 2:86.  Unless otherwise prescribed by the authority from which the moneys are received, the funds shall be kept in a separate fund designated according to the purposes for which the funds are made available.  The funds shall be held and disbursed by the state for such purposes and upon such conditions upon which they are made available.