La. Roads, Bridges and Ferries § 48:590
The governing authority of any parish in which there is one or more road districts or sub-road districts may, in the manner prescribed in R.S. 48:591, consolidate all of the road districts and sub-road districts or any number of them into one road district. It may, at the same time, add thereto and include in the new district any part or parts of the parish not previously included in a district.
Any such road district created shall be known as a consolidated road district and its bonds shall be known as consolidated road district bonds. No consolidated road district shall, however, comprise the entire territory of a parish. In case there is more than one consolidated road district in a parish, they shall be distinguished by adding to their names the letters A, B, C, etc.
La. Roads, Bridges and Ferries § 48:590