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USS Montana (BB-67) Battleship (1940)

Authored By Staff Writer | Last Updated: 3/17/2015

The USS Montana was to have been the most powerful battleship ever devised for the US Navy but the arrival of the aircraft carrier changed everything.

To counter the growing threats posed by Japanese warships, particularly the mighty IJN Yamato battleship - considered by most to have been the most powerful battleship ever built - the United States government authorized the construction of a new class of fighting surface ship on July 19th, 1940 to follow the preceding Iowa-class into service and further strengthen American naval power against what looked to be an imminent war with the Empire of Japan. The new breed, built around firepower and stout armor protection (though at the expense of speed), became the Montana-class and would entail the construction of five total ships. At least three shipyards were contracted with their manufacture - the New York Naval Shipyard, the Philadelphia Naval Shipyard and Norfolk Naval Shipyard.

The Montana-class of battleships would go on to become the last battleships to be authorized for production by the United States Navy - not only in World War 2, but in its storied history. The USS Montana (BB-67) would naturally become the lead ship the class and her proposed sisters were designated as follows: USS Ohio (BB-68), USS Maine (BB-69), USS New Hampshire (BB-70) and USS Louisiana (BB-71). However, by this time in naval history, the aircraft carrier had proven its worth for the American Navy, particularly during and after the Battle of Midway, and priority in the American war effort had now shifted to design and production of more aircraft carriers. This shift inevitably signaled the end to the battleship era and her reign as undisputed queen of the sea. The United States Navy had learned - and effectively shown the world along the way - that future battles at sea would be decided by air elements and not so much by big-gunned surface warships as in decades past. The lean towards aircraft carriers meant that no part of any of the Montana-class ships was ever produced or laid down - the USS Montana herself would exist only in drawings and scale models.

The design profile of the Montana was a rather conventional effort as battleships of the time went. The differentiating factor between it and the preceding Iowa-class was its additional aft turret emplacement. All main gun weaponry was housed in large armored turrets that stood stories tall from their roof to their bases, requiring dozens of gunnery crew to manage. At amidships there was contained the bridge and major superstructures for the various required warfare and logistics departments. A pair of smoke funnels was noticeable between the forward and rear superstructures. A bevy of antenna and arrays dotted her vertical reaches. The bow deck was relatively featureless and rose out of the water to cut through rough seas. A massive support crane could be seen at amidships, designed to take on the large amounts of stores needed to feed and house the crew. The vessel would have been home to approximately 2,355 standard personnel though this number could balloon to 2,780 if needed - either in wartime or when she would be fielded as a flag ship of the fleet. Power for the USS Montana was slated to be no fewer than 8 x Babcock & Wilcox brand boilers delivering to 4 x Westinghouse geared steam turbines powering 4 x propeller shafts at 43,000 horsepower. Performance specifications were estimated with a top speed of 28 knots in ideal conditions through a range equaling some 17,000 miles (the IJN Yamato rated at 27 knots and 8,286 miles). Armor protection for the Montana-class included a side belt thickness of 16.1 inches (409mm). Bulkheads would have measured in at 18 inches thick while turret barbettes would have been protected by 21.3 inches of armor. The turrets themselves were to be pressed by 22.5 inches of armor thickness. Decks would have been plated up to 6 inches at their stoutest. The IJN Yamato measured 26 inches of armor protection at her thickest. Her standard displacement was estimated at 66,000 tons on a standard load and some 71,000 tons with a war load. Her running length was over 920 feet with a beam of exactly 121 feet and draught of just over 36 feet.

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Specifications for the
USS Montana (BB-67)

Country of Origin: United States
Initial Year of Service: 1940
Operators: United States

Crew: 2,355

Length: 920.5 ft (280.57 m)
Beam: 121 ft (36.88 m)
Draught: 36 ft (10.97 m)
Displacement: 66,040 tons

Machinery: 8 x Babcock & Wilcox 2-drum express-type boilers; 4 x Westinghouse geared steam turbines delivering 43,000 horsepower to 4 x shafts.

Surface Speed: 28 kts (32 mph)
Range: 17,000 miles (27,359 km)

12 x 16-inch Mark 7 main guns in four triple-mounted turrets.
20 x 5-inch Mark 16 cannons
10 to 40 x 40mm Bofors anti-aircraft cannons
56 x 20mm Oerlikon anti-aircraft cannons
.50 caliber machine guns for close-in self-defense as needed.

Air Arm: 3 OR 4 x Vought OS2U Kingfisher OR Curtiss Seahawk floatplanes.

Ship Class: Montana-class
Number-in-Class: 5
Ships-in-Class: USS Montana (BB-67); USS Ohio (BB-68); USS Maine (BB-69); USS New Hampshire (BB-70); USS Louisiana (BB-71)