James Madison-class submarine

USS John C. Calhoun (SSBN-630) entering Holy Loch, Scotland on completion of the thousandth Polaris nuclear deterrent patrol, 18 May 1972.
Class overview
Builders	General Dynamics Electric Boat[1] Mare Island Naval Shipyard[1] Portsmouth Naval Shipyard[1] Newport News Shipbuilding and Drydock Company[1]
Operators	United States Navy
Preceded by	Lafayette class
Succeeded by	Benjamin Franklin class
Built	1962–1964
In commission	1964–1995
Completed	10
Retired	10
Preserved	1 (as training vessel)
General characteristics
Type	Nuclear-powered ballistic missile submarine
Displacement	Surfaced: 7,325 long tons (7,443 t) Submerged: 8,251 long tons (8,383 t)[2]
Length	425 ft (130 m)
Beam	33 ft (10 m)
Draft	28 ft 6 in (8.69 m)
Propulsion	1 × S5W PWR[1] 2 geared steam turbines (15,000 shp (11,000 kW)), 1 shaft[2]
Speed	16 knots (30 km/h) surfaced 21 knots (39 km/h) submerged[2]
Test depth	1,300 feet (400 m)[2]
Complement	Two crews of 14 officers and 126 enlisted[2]
Armament	16 Polaris A3 or Poseidon C3 or Trident I C4 missiles, 4 × 21-inch (533 mm) torpedo tubes, 12 torpedoes[2]

The James Madison class of submarine was an evolutionary development from the Lafayette class of fleet ballistic missile submarine. They were identical to the Lafayettes except for being initially designed to carry the Polaris A-3 missile instead of the earlier A-2. This class, together with the George Washington, Ethan Allen, Lafayette, and Benjamin Franklin classes, composed the "41 for Freedom" that was the Navy's primary contribution to the nuclear deterrent force through the late 1980s. This class and the Benjamin Franklin class are combined with the Lafayettes in some references.

In the early 1970s all were modified for the Poseidon C-3 missile. During the late 1970s and early 1980s, six boats were further modified to carry the Trident I C-4 missile, along with six Benjamin Franklin-class boats. These were James Madison, Daniel Boone, John C. Calhoun, Von Steuben, Casimir Pulaski, and Stonewall Jackson.^[3]

The James Madisons were decommissioned between 1986 and 1995 due to a combination of SALT II treaty limitations as the Ohio-class SSBNs entered service, age, and the collapse of the Soviet Union. One (Sam Rayburn) remains out of commission but converted to a Moored Training Ship (MTS-635) with the missile compartment removed. She is stationed at Norfolk Naval Shipyard in Portsmouth, Virginia for inactivation.^[3]

Submarines of the James Madison class:^[3][4] (Submarines marked with * indicate Trident I C-4 ballistic missile conversions.)

• List of submarines of the United States Navy
• List of submarine classes of the United States Navy

• Gardiner, Robert and Chumbley, Stephen (editors). Conway's All the World's Fighting Ships 1947–1995. Annapolis, US: Naval Institute Press, 1995. ISBN 1-55750-132-7.
• Polmar, Norman. The Ships and Aircraft of the U.S. Fleet: Twelfth Edition. London:Arms and Armour Press, 1981. ISBN 0-85368-397-2.
• US Naval Vessel Register – List of SSBN BALLISTIC MISSILE SUBMARINE (NUCLEAR-POWERED) Class vessels
•  This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.

Wikimedia Commons has media related to James Madison class submarines.

• NavSource.org SSBN photo gallery index