| 1795 March 17 |
Don Carlos Trudeau is chosen to be the surveyor of the Maison Rouge grant, but he does not actually travel to Ouachita at this time. |
| 1797 June 14 |
The survey plat and process verbal dated on this day by Don Carlos Trudeau is later declared fraudulent as per testimony of Don Juan Filhiol, McLaughlin and Pomier. The actual survey was in December 1802 and January 1803 after the Marquis' death. |
| 1805-1806 |
President of the New Orleans City Council |
| 1812 |
Acting Mayor between the administrations of James Mather and Nicholas Girod |