Overview and historical setting
The Des Moines class was designed during the war around rapid-fire automatic 203 mm guns.
The class belongs to the history of cruisers and served during World War II and postwar era. Cruisers were expected to combine endurance and independent action with fleet duties such as scouting, screening, command, trade protection, and surface combat. That broad mission set produced considerable variation in armament, protection, speed, sensors, and size from one generation to another. For Des Moines class, the documented mission set included service as a principal combatant within a fleet, delivery of naval gunfire against targets ashore, and air defense.
Development and design
The ships combined a large cruiser hull, improved protection, and automatic main batteries intended to solve the slow rate of fire of earlier heavy cruisers. The program chronology records design work beginning in 1943, construction beginning in 1945, and the documented construction period ending in 1949. Program totals list 4 planned, 4 ordered, 4 laid down, 3 completed, and 1 cancelled. These dates and totals distinguish the design program from the number of ships that were actually completed and entered service.
The design evidence for Des Moines class identifies heavy cruiser, automatic 203mm, and steam turbine and service as a principal combatant within a fleet, delivery of naval gunfire against targets ashore, and air defense. These features connect the class's technical arrangement to the work it was expected to perform for United States Navy. Later refits, revised sensors, new weapons, and changes in doctrine could alter the practical capabilities of individual members without changing their class identity.
Technical character
The As completed configuration is presented as the as-completed configuration. Its listed characteristics include displacement 17,255 metric ton (standard), length 218.4 m, beam 23.0 m, and draft 7.92 m. The recorded armament is 9 × 203 mm automatic; 12 × 127 mm dual-purpose; 76 mm and 20 mm AA. The figures describe one documented state and may not apply unchanged throughout the subject's service life.
Technical data for Des Moines class is most useful when tied to a date and mission. Displacement changed with fuel, ammunition, electronics, weapons, and later modifications; speed and range depended on operating conditions; and sensors or armament could vary substantially between members and periods of service.
Ships of the class
The documented roster contains 4 members. These include USS Des Moines (CA-134), USS Salem (CA-139), USS Dallas (CA-140), and USS Newport News (CA-148). The sources reviewed do not establish this as a final class total, so the roster should be read as time-specific.
Individual ship histories are needed to show how a common design diverged through construction differences, refits, damage, transfers, new assignments, and final disposition. For a ship-level view of the class in service, see USS Salem, whose profile follows the evidence available for one member of Des Moines class.
Service history
Several hulls were begun as the war ended; three ships eventually completed. The shared design created a common starting point, while individual ships could accumulate different deployments, combat damage, modernization work, transfers, and end states.
Historical significance
The class was the final generation of U.S. All-gun heavy cruisers. Its significance is best assessed through the relationship between mission, technical choices, production scale, and the service experience of its members.
For Des Moines class, the most useful points of comparison are the requirement for service as a principal combatant within a fleet, delivery of naval gunfire against targets ashore, and air defense, the use of heavy cruiser, automatic 203mm, and steam turbine, and a program recorded as 4 planned, 4 ordered, 4 laid down, 3 completed, and 1 cancelled. Those factors help explain what the class offered United States Navy, how it differed from predecessors or contemporaries, and why ships built to the same design could still have different careers.
Understanding Des Moines class across time requires separating the design as approved, the configuration in which individual ships entered service, and later changes made after operational experience. For United States Navy, that distinction matters because a refit could alter weapons, sensors, aviation facilities, command arrangements, or mission without creating a new class. The class history defines the common baseline; dated ship histories show how each member changed within it.
Ships in this class
Showing 4 recorded class members.
Sources and further reading
- DES MOINES heavy cruisers (1948–1949) ↗Navypedia · accessed 2026-09-18
- Conway's All the World's Fighting Ships, 1922–1946Conway Maritime Press