He graduated from the United States Naval Academy in 1858, and was promoted to lieutenant in April 1861.

[3] He married Arabelle E. Krause on May 11, 1867, and they had three children: William, Arabella, and Frances.

[3] Howell was promoted to captain on March 1, 1884, and in 1887 was a member of the Naval Advisory Board.

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