USS Alert (AS-4)

Alert, serving as tender for the Third Submarine Division of the Pacific Fleet, lying alongside the wharf at Kuahua Island, U.S. Naval Station, Pearl Harbor, 22 August 1917. K-3 and K-4 are identifiable alongside; the unidentified "boat" is probably K-8.
History
NameUSS Alert
BuilderJohn Roach & Sons
Laid down1873
Launched18 September 1874
Commissioned27 May 1875
Decommissioned9 March 1922
FateSold 29 July 1922
General characteristics
Class and typeAlert-class gunboat
Displacement1,020 long tons (1,040 t)
Length199 ft 9 in (60.88 m)
Beam32 ft (9.8 m)
Draft13 ft (4.0 m)
Speed10 kn (12 mph; 19 km/h)
Complement202 officers and enlisted
Armament1 × 11 in (280 mm) smoothbore, 2 × 9 in (230 mm) smoothbore, 1 × 60-pounder rifled, Spar torpedoes

The third USS Alert was an iron-hulled screw steamer gunboat in the United States Navy. The lead ship in her class, Alert was destined for a long naval career, serving from 1875 to 1922, a period of 47 years, including service as a submarine tender in World War I. Toward the end of her career she received the designation AS-4.

Alert was laid down in 1873 by John Roach & Sons at the Delaware River Iron Ship Building and Engine Works shipyard, Chester, Pennsylvania in 1873. Launched on 18 September 1874, Alert was commissioned for the first time on 27 May 1875 with Commander William T. Sampson in command.