They're small packet boats used on the Ohio River and it's tributaries. The bottom one is the Allegheny. I believe this may be info on her...
ALLEGHENY BELLE No. 4
Type: sternwheel, wooden hull packet. Size: 143 tons.
Power: 16's -6 ft.
Launched: 1859, Pittsburgh, Pa.
Destroyed: 1875, May 23, Below Portland Bar, below Louisville, hit
barge and sank.
I can't make out the top one. I'm not sure of a source of plans for small packets, but a lot were converted to civil war vessels. One good place to start is the Maryland Silver Company. They have plans from warships all the way back to civil war vessels.
http://www.marylandsilver.com/Default.htm