USS El Dorado (Constitution class)

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The USS El Dorado was a Federation Constitution-class (Mk II Bonhomme Richard-subclass) class I/class IXA heavy cruiser starship in service to Starfleet in the 23rd century.

The construction of the El Dorado was authorized by Starfleet appropriation on stardate 3220, and she was assigned the registry number NCC-1722. (TOS reference: Star Fleet Technical Manual)

She was eventually built and had entered service by reference stardate 2/0109 and now had the assigned registry number NCC-1724. She was later refit to Mk III (Achernar-subclass) specifications around stardate 2/0212, and later refit to Mk IV (Tikopai-subclass) specifications around stardate 2/1202. (TOS roleplay module: Federation Ship Recognition Manual)

In 2261, the El Dorado conducted a follow-up visit to the Chyrelkan system. (TOS novel: Renegade)

At some point prior to 2264, James T. Kirk served as first officer aboard the El Dorado. He brought this up in conversation with Number One, after meeting her during his first "unofficial" tour of the USS Enterprise, in the hopes of finding a commonality with her. (TOS comic: "All Those Years Ago...")

The El Dorado was later placed in the inactive reserve fleet on stardate 2/2006. (TOS roleplay module: Federation Ship Recognition Manual)

Bonhomme Richard-subclass (Constitution-class mk II class I/class XI cruiser/heavy cruiser starships)
Refit with mk II engines	Kongo • Valiant
Built to mk II specifications	Bismark • Bonhomme Richard • Centurion (fm. Farragut II) • Constellation • Challenger • Eagle • El Dorado • Endeavour • Essex • Excelsior • Hornet • Intrepid • Kent • Merrimac • Monitor • Saratoga • Wasp • Yamato
Authorized for construction	Ari • Defiance • Krieger • Lafayette • Tori

Achernar-subclass (Constitution-class mk III class I/class XI cruiser/heavy cruiser starships)
Refit with mk III engines	Bismark • Bonhomme Richard • Challenger • Constellation • Constitution • Defiant • Eagle • El Dorado • Endeavour • Enterprise • Essex • Excalibur • Exeter • Farragut • Hood • Hornet • Intrepid • Kent • Kongo • Lexington • Potemkin • Republic • Saratoga • Valiant • Yamato • Yorktown
Built to mk III specifications	Akagi • Ark Royal • Caspan • Chikuma • Discovery • Forrestal • Kaga • Kitty Hawk • Langley • Littorio • Marseille • Radetsky • Richelieu • Rivoli • Santissima Trinidad • Sirius • Ticonderoga • Victory
Authorized for construction	Achernar • Ahzdar • Alam'ak • Alferaz • Alfr • Androcus • Annobon • Astrad • Behr'ak • Czar'ak • Ekinus • Elohim • Esabl • Eskiis • Galina • Ghar • Ghondr • Hajj • Hiemdal • Horok • Jassan • Jenshahn • Jupiter • Kars • Kasimar • Kep Salu • Kestral • Ketoi • Maat • Mazda • Mengen • Mirazh • Mondoloy • Mongo • Ndele • Oblik • Oomaru • Paegan • Pari • Pelione • Phardos • Pilar • Procyon • Proxima • Qizan • Qual'at • Quindar • Rigil Kentaurus • Salayna • Samaara • Shaandra • Shahr • Sinuiji • Sol • Tajarhi • Tali • Temir • Thelonii • Tholus • Tulan • Tutakai • Xanthii • Yaan • Za'faran • Zaahm • Zindar

Tikopai-subclass (Constitution-class mk IV class I/class XI cruiser/heavy cruiser starships)
Refit to mk IV specifications	Discovery • El Dorado • Endeavour • Forrestal • Hornet • Kent • Kitty Hawk • Langley • Littorio • Radetsky • Richelieu • Saratoga
Built to mk IV specifications	Acrux • Bellatrix • Binar • Capella • Deneb • El Nath • Helios • Regulus • Rigel • Tikopai • Vega
Authorized for construction	Adhara • Agena • Aldebaran • Alioth • Alkaid • Alnilam • Altair • Anak • Antares • Arcturus • Arided • Betelgeuse • Canopus • Castor • Darion • Dubhe • Fomalhaut • Hor • K'hotan • K'ushui • Lux • Miaplacidas • Mirfak • Murzim • Nakarat • Polaris • Pollux • Sardar • Shaula • Spica • Vena • Wezen