I've tooled around a little bit with Donald Canney's Lincoln's Navy: The Ships, Men and Organization, 1861-65 (1998). Although its physical dimensions are oversized to a level annoying to me, it struck me as a solid reference guide to the Union navy and seems to still have a good reputation among briny readers. Canney is now turning his attention to the other side with The Confederate Steam Navy: 1861-1865 (late summer 2015):
"This is the first book-length study devoted to the vessels of the Confederate Navy, including all types used during the conflict: ironclads (both domestic and foreign-built), commerce raiders, blockade runners, riverine and ocean-going gunboats, torpedo and submersible vessels, and floating batteries. The book emphasizes the development, construction, and design of these vessels using, where available, original plans, photographs, and contemporary descriptions. The author describes these vessels in context with wartime conditions as well as with the transitional naval technology of the era. Over 100 vessels are detailed, including more than 30 ironclads, both American and foreign built. Over 150 illustrations are included, many of which have not previously been published."