Cincinnati was ordered on 29 August 1916, and contracted to be built by
Todd Dry Dock and Construction Company,
Tacoma, Washington, on 27 August 1917. Her keel was laid on 15 May 1920, and she was
launched on 23 May 1921. She was
sponsored by Mrs. Charles E. Tudor, wife of the Director of Safety of Cincinnati, having been designated by the Honorable John Galvin, Mayor of Cincinnati.
Cincinnati was
commissioned on 1 January 1924,
Captain Charles P. Nelson in command.
Cincinnati was
long at the waterline with an
overall length of , her
beam was and had a mean
draft of . Her
standard displacement was and at
full load. Her crew, during peacetime, consisted of 29 officers and 429 enlisted men.
Cincinnati was powered by four
Westinghouse geared
steam turbines, each driving one
screw, using steam generated by 12
Yarrow boilers. The engines were designed to produce and reach a top speed of . She was designed to provide a range of at a speed of , but was only capable of at a speed of 10 knots.
Cincinnatis main armament went through many changes while she was being designed. Originally she was to mount ten
/53 caliber guns; two on either side at the waist, with the remaining eight mounted in tiered
casemates on either side of the fore and aft superstructures. After the United States entry into
World War I the US Navy worked alongside the
Royal Navy and it was decided to mount four 6-inch/53 caliber guns in two twin
gun turrets fore and aft and keep the eight guns in the tiered casemates so that she would have an eight gun broadside and, due to limited arcs of fire from the casemate guns, four to six guns firing fore or aft. Her secondary armament consisted of two
/50 caliber
anti-aircraft (AA) guns in single mounts. She also carried two triple and two twin, above-water
torpedo tube mounts for
torpedoes. The triple mounts were fitted on either side of the upper
deck, aft of the
aircraft catapults, and the twin mounts were one deck lower on either side, covered by hatches in the side of the hull.
Cincinnati was also built with the capacity to carry 224
mines. The ship lacked a full-length
waterline armor belt. The sides of her
boiler and engine rooms and steering gear were protected by three inches of armor. The transverse
bulkheads at the end of her machinery rooms were thick forward and three inches thick aft. The conning tower and the deck over the machinery spaces and steering gear had one and a half inches of armor. The gun turrets were not armored and only provided protection against
muzzle blast and splinter damage. floatplanes on USS
Cincinnati at Vancouver 1937.
Cincinnati carried two
floatplanes aboard that were stored on the two catapults. Initially these were
Vought VE-9s, then
Vought UO-1s, the ship then operated
Curtiss SOC Seagulls from 1935, and
Vought OS2U Kingfishers after 1940.
Armament changes During her career
Cincinnati went through several armament changes. Some of these changes were to reduce weight, but others were to increase her AA armament. On 8 September 1926, the
Chief of Naval Operations,
Admiral Edward W. Eberle, along with the Commanders in Chief of the
United States Fleet and
Battle Fleet, and their subordinate commanding officers, the
Secretary of the Navy,
Curtis D. Wilbur, ordered that all mines and the tracks for laying the mines be removed from all of the
Omaha-class cruisers, the working conditions had been found to be very "wet". Another change made before the war was to increase the 3-inch guns to eight, all mounted in the ship's waist. After 1940, the lower aft 6-inch guns were removed and the casemates plated over for the same reason as the lower torpedo mounts. The ship's AA armament were originally augmented by three quadruple
/75 gun mounts by early 1942, however, these didn't prove to be reliable and were replaced by twin
Bofors guns along with 14
Oerlikon cannons by the end of the war. It was reported that
Cincinnati also mounted a pair of
Army 40mm Bofors guns. ==Service history==