I realize now that my map was erroneous.

The curve of Basin Street, just outside the French Quarter, marks the old basin that once lay at the end of Bayou St. John, a natural geographical feature which used to run all the way into town and come to an end where they dug a man-made turning basin. Now the bayou comes to an end quite a bit further back toward to Lake, at Jeff Davis corner of Conti.

The New Basic Canal was dug a bit west of the bayou and terminated at a newly built basin, about where today's Union Passenger Terminal (bus & Amtrak station) stands, and at the point where the route marked on the map I posted yesterday takes a sharp turn. Just ignore the last leg of the route marked on yesterday's map to see the path of the old New Basic Canal.

Don't have time to make a new map right now; maybe later.

leeneia: Nice job spelling Tchoupitoulas, which is an even more difficult task than spelling Pontchartrain.

Alice: apologies for getting mixed up over who originally misspelled Pontchartrain...