Ala. Code § 11-81-20: Investment of Funds Received to Credit of Sinking Fund.

Any funds of any municipality or county which may come into the hands of such county or municipality to the credit of any sinking fund may be by such county or municipality invested in bonds of the United States, bonds of the State of Alabama or of any county or municipality thereof or in any public improvement bonds issued by any municipality in the State of Alabama which are general obligations of such municipality.