In the ongoing discussion in other threads about ship building, I've been doing a little research, and found this fabulous link:
Ironclads and Blockade Runners of the American Civil War.
http://www.wideopenwest.com/~jenkins/ironclads/ironclad.htm
As to the discussion as to the locations these things were built in;
http://www.wideopenwest.com/~jenkins/ironclads/unionriver.htm
Nearly all were built in Carandolet/St. Louis or Mound City, Il, just above Cairo. Some were built in Cincinnati, OH, and two were uncompleted out of Pittsburgh, PA.
It appears 80%, thereabouts, were built in either St. Loius or above Cairo, and all were fit up and crewed at Cairo, IL.
Build times are mentioned here as well - I believe I am going to work up a spreadsheet on these beasties...to map out build times and locations.
For the City Class;
USS Cairo, USS Carandolet, USS Cincinnati, USS Mound City, USS Pittsburg, USS St. Louis, USS Louisville,
Ordered 7 Aug 61
Launched Mid October 61
Commissioned Mid January 62
Locations, evenly distributed between Mound City, IL and Carandolet, MO.
All saw action by February, most getting first involved at Ft. Henry.
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Here is the link to coastal ironclads (monitors)
http://www.wideopenwest.com/~jenkins/ironclads/unioncoast.htm
What a fiasco with the entire Casco class - engineering rivalry and disrespect run amok!