His postwar service included command of
USS Nipsic,
USS Enterprise, and
USS Omaha – the last two on the
Asiatic Station. In 1870, while in command of the first of these ships, he led an expedition to
Panama, surveying the landscape for a route that could be used for a canal. He also conducted subsequent expeditions to this area later in 1870 and again 1873. Although the route he proposed was not actually used for the
Panama Canal, his work did show that
Darien was not a good choice, thus narrowing down the construction possibilities. He was promoted to
captain in 1881. While in command of the
Omaha in 1887, Selfridge conducted target practice off the coast of the Japanese island of
Ikeshima which resulted in the deaths of four Japanese and the wounding of seven others. This created an international incident, but Selfridge was acquitted at a court martial in 1888. In 1885, Captain Selfridge, of the U. S. man-of-war
Omaha, delegated a lieutenant to present his compliments to Captain De Saune, the French commander of the
Isère, laden with the
Statue of Liberty, and suggest that
Gravesend Bay would be a safer anchorage than the
Sandy Hook Horseshoe. He was promoted to
commodore in 1894 and then had duty as Commander in Chief of the
European Squadron from 1895 to 1898. While commanding the European Squadron his flagship was the cruiser
USS San Francisco. He was promoted to rear admiral in 1896, which made him and his father the first father and son to be admirals in the United States Navy. His nephew,
Thomas Etholen Selfridge, a US Army Field Artillery officer and one of the first pilots in the nascent Army Air Service, became the first person to die in the crash of a powered airplane in 1908. Rear Admiral Selfridge retired on February 6, 1898. He died from heart disease in
Washington, D.C., on February 4, 1924. Effects from his estate were put up for auction by
C.G. Sloan & Co. of Washington, D.C., in 1926. Like his father, he was a Veteran Companion of the
Military Order of the Loyal Legion of the United States and an Honorary Hereditary Companion of the
Military Order of Foreign Wars. He was also a Chevalier of the French
Legion of Honor. ==Namesake ships==