Church of the Ascension Corner of St. Patrick and Nichols Street
Donaldsonville, LA 70346 Map
Phone: 225-473-3114
Email: joetina71@aol.com
 there is a GenWeb cemetery transcrption that says Henry Johnson donated land to an Episcopal church in Donaldsonville and that he may have been reinterred in Donaldsonville.

I walked the Protestant Cemetery and Ascension Catholic Cemetery looking for some sign of him.  A lot of Johnson's where in the Protestant Cemetery.  Many grave sites are disintegrated.  The cemetery is old enough to have him.