Union Coastal Armored Vessels

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Monitors

Monitors were riverine and coastal warships chiefly characterized by a flat deck fore to aft, very low freeboard, and the presence one or more turrets housing two guns each.

Image	Name / Type / Dates / Ships
	Monitor class Type: Single-turret ironclad monitor Commission: February 25, 1862 Fate: Sunk in gale, December 31, 1862 Ship in class: USS Monitor
	Passaic class Type: Single-turret ironclad monitor Commission: Between October 1862 and May 1865 Fate: Two sunk; remaining scrapped Ships in class: USS Passaic USS Patapsco USS Nahant USS Montauk USS Sangamon USS Weehawken USS Nantucket USS Catskill USS Lehigh USS Camanche*
	Roanoke class Type: Triple-turret ironclad monitor converted Merrimack class frigate Commission: June 29, 1863 Fate: Scrapped Ship in class: USS Roanoke
	Canonicus class Type: Single-turret ironclad monitor Commission: Between April 1864 and February 1866 Fate: One sunk; remaining scrapped Ships in class: USS Canonicus USS Saugus USS Tecumseh USS Manhattan Catawba, Never Commissioned USS Mahopac USS Ajax (ex-Manayunk)* Oneota, Never Commissioned USS Wyandotte (ex-Tippecanoe)*
	Onondaga class Type: Twin-turret ironclad monitor Commission: March 24, 1864 Fate: Sold to France; scrapped Ship in class: USS Onondaga
300px	Miantonomoh class Type: Twin-turret ironclad monitor Commission: Between October 1864 and October 1865 Fate: Scrapped Ships in class: USS Miantonomoh* USS Monadnock USS Agamenticus* USS Tonawanda*
300px	Milwaukee class Type: Twin-turret ironclad monitor Commission: Between April and August, 1864 Fate: Lead ship sunk; remainder scrapped Ships in class: USS Milwaukee USS Winnebago USS Chickasaw USS Kickapoo
300px	Dictator class Type: Single-turret ironclad monitor Commission: November 11, 1864 Fate: Scrapped Ship in class: USS Dictator
300px	Puritan class Type: Single-turret ironclad monitor Originally-planned for two turrets Not commissioned Fate: Broken up at the shipyard Ship in class: USS Puritan
	Casco class Type: Shallow water single turret monitor / torpedo boat Commission: Between December 1864 and August 1865 Fate: Scrapped Ships in class: Built as torpedo boats: USS Casco USS Chimo USS Naubuc Napa, Never Commissioned Modoc, Never Commissioned Built as Monitors: USS Tunxis USS Squando* USS Suncock* USS Shawnee* Klamath, Never Commissioned Nausett, Never Commissioned Waxsaw, Never Commissioned Yazoo, Never Commissioned Koka, Never Commissioned Yuma, Never Commissioned Cohoes, Never Commissioned Etlah, Never Commissioned USS Iris* Wassuc, Never Commissioned Umpqua, Never Commissioned
300px	Kalamazoo class Type: Twin-turret ironclad monitor Not commissioned Fate: Never completed; broken up at the shipyard Ships in class: Kalamazoo Passaconaway Quinsigamond Shackamaxon

Broadside Ironclads

Large vessels loosely-based on the designs of traditional sloops and frigates.

• USS New Ironsides

Type: Broadside Ironclad Frigate, Three Sailing Masts

Commission: August 21, 1862

• USS Galena

Type: Experimental Ironclad Sloop, Two Sailing Masts

Commission: April 21, 1862

Casemate Ironclads

Either built from the keel up or converted from wooden warships or river steamers via razing of the upper bulworks. Result is a low-freeboard vessel with broadside guns housed within an armored casemate.

• "Stevens Battery"

Type: Experimental Battery Ironclad

Commission: Never

• Dunderberg

Type: Seagoing Ironclad Frigate Ram

Commission: Never

• USS Keokuk

Type: Twin Casemate Ram

Commission: February 24, 1863

• USS Atlanta

Type: Casemate Ram (Captured C.S.S. Atlanta)

Commission: Fall 1863

• USS Tennessee

Type: Casemate Ram (Captured C.S.S. Tennessee)

Commission: August 19, 1864

(*) Did not see service until after the Civil War