Mo. Rev. Stat. § 204.668

After an improvement has been authorized under sections 204.650 to 204.672, the governing body of the district may issue temporary notes of the district to pay the costs of such improvement in an amount not to exceed the estimated cost of such improvement. Such temporary notes may be issued in anticipation of issuance of revenue bonds of the district. The district may participate in any governmentally sponsored bond pooling program or other bond program. Bonds may be issued and made payable from special assessments paid in the form of user fees under subsection 4 of section 204.660 and other revenues of the district.