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{{short description|Class of United States Navy fleet tugs (1918)}}{{Infobox ship image| Ship image=File:USS Bagaduce (AT 21) in New York Navy Yard.tif | Ship caption=Fleet tug USS Bagaduce (AT 21) in New York Navy Yard on August 28, 1925
}}{{Infobox ship class overview | Name= | Builders= | USA}} | Class before=none | Navajo|tugboat|4}} | Subclasses= | Cost= | Built range= 1918-1920 | In service range= | In commission range=1918-1946 | Total ships building= | Total ships planned= | Total ships completed=20 | Total ships cancelled= | Total ships active= | Total ships laid up= | Total ships lost=3 | Total ships retired=17 | Total ships preserved=0
}}{{Infobox ship characteristics | Hide header= | Header caption= | Ship type=Fleet tugboat | 1000|LT|t|0|lk=in}} (normal) | 156|ft|8|in|m|abbr=on}} | 30|ft|m|abbr=on}} | Ship height= | 14|ft|7|in|m|abbr=on}} | Ship depth= | Ship hold depth= | Ship propulsion= | Ship sail plan= | 12.4|kn|lk=in}} | Ship range= | Ship endurance= | Ship complement= | Ship sensors= | Ship EW= | Ship armament=2 × 3" guns | Ship armor= | Ship aircraft= | Ship aircraft facilities= | Ship notes=
}} | The Bagaduce class was a class of United States Navy fleet tugs. The first ship of the class, {{USS|Bagaduce|AT-21}} was laid down on 16 July 1918 at Buffalo, New York, by the Ferguson Steel and Iron Company. She was briefly named Ammonoosuc in February 1919, renamed Bagaduce on 24 February 1919, launched 5 April 1919, and commissioned at Buffalo on 18 September 1919.[1] The Bagaduce was constructed as part of the World War I shipbuilding program, and was the first of 19 new steel tugs designed to serve as minesweepers and conduct heavy-duty towing work at navy yards.[1] Ships| Ship name | Hull number | Commissioned | Decommissioned | Fate | | Sagamore | AT-20 | 8 June 1918 | 31 August 1946 | Sold to a commericial interest, 24 December 1947; scrapped, 1953 |
| Bagaduce | AT-21 | 18 September 1919 | 22 June 1946 | Fate unknown |
| Tadousac | AT-22 | 13 June 1919 | 10 April 1946 | Destroyed, 10 April 1946 |
| Kalmia | AT-23 | 18 November 1919 | 15 May 1946 | Sold to a commericial interest, 21 January 1947; fate unknown |
| Kewaydin | AT-24 | 4 November 1919 | 10 December 1945 | Fate unknown |
| Umpqua | AT-25 | 6 December 1919 | 24 May 1946 | Sold to a commericial interest, 4 December 1946; fate unknown |
| Wandank | AT-26 | 23 March 1920 | 20 September 1946 | Sold to a commericial interest, 20 September 1945; fate unknown |
| Tatnuck | AT-27 | 26 July 1919 | 12 September 1946 | Sold to a commericial interest, 26 April 1947; fate unknown |
| Sunnadin | AT-28 | 20 October 1919 | 4 April 1946 | Sold for scrap, 15 January 1947 |
| Mahopac | AT-29 | 20 October 1919 | 12 September 1946 | Fate unknown |
| Sciota | AT-30 | 13 November 1919 | 16 January 1946 | Fate unknown |
| Koka | AT-31 | 18 February 1920 | n/a | Ran aground, 7 December 1937; later sank |
| Napa | AT-32 | 5 December 1919 | n/a | Scuttled to avoid capture, 8 April 1942 |
| Pinola | AT-33 | 7 February 1920 | 31 January 1946 | Fate unknown |
| Algorma | AT-24 | 15 May 1920 | 18 June 1946 | Sold to a commericial interest, 23 December 1946; fate unknown |
| Carrabasset | AT-35 | 30 June 1920 | 26 July 1946 | Fate unknown |
| Contocook | AT-36 | 20 August 1920 | 27 November 1933 | Sold to the Royal Navy, 1940; commissioned as HMS Sea Giant (W-125); decommissioned, 1946; fate unknown |
| Iuka | AT-37 | 29 October 1920 | 15 August 1946 | Sold to a commercial interest, 18 December 1947; fate unknown |
| Keosanqua | AT-38 | 9 December 1920 | 6 May 1946 | Sold to a commercial interest, 11 July 1947; scrapped, 1968 |
| Montcalm | AT-39 | 19 January 1921 | 24 May 1946 | Fate unknown |
References1. ^1 [https://www.history.navy.mil/content/history/nhhc/research/histories/ship-histories/danfs/b/bagaduce-i.html USS Bagaduce (AT-21) at the Navy History and Heritage Command] {{PD-notice}}
3 : Bagaduce-class fleet tugs|Auxiliary ship classes of the United States Navy|Auxiliary tugboat classes |