Statistics for occurrence #1 of “Port Hudson, La.” in chapter 48 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

... April 4, 1864 (which see). Organized at Port Hudson, La., October 9, 1863. Attached to 2nd Brigade, 2nd Division, Corps de Afrique, Dept. of the Gulf, to April, 1864. Duty at Port Hudson, La. , till April, 1864. Designation of Regiment changed to 90th United States Colored Troops, April 4, 1864 (which see). Organized at Madisonville, La., February 11, 1864. Duty at Madison...
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