Rapaire, some excellent shots of the old river steamboats (must use internet explorer).
I believe that I found a description of the Pittsburg. Built in 1879, she was dismantled in 1945, a long life for these boats. Sternwheeler, 250 feet long.
See Index of Riverboats This index is far from complete. Indexes to Boats, Boat Captains, and Owners and Companies at the bottom of each page.

The page (p-2)listing the Pittsburg has a Currier and Ives print of one of the boats named Princess "wooding up."