Here's the listing for the Robert E. Lee from the third edition of Gateway Gourmet, a book of menus and recipes from St. Louis restaurants (Great Menus Publishing Co., 1977):
"The elegant décor of the Lt. Robert E. Lee, an authentic replica of an old-time sternwheeler, is reminiscent of a bygone era in St. Louis. Plush velvet and crystal enhance the dining rooms, decorated in 1850s style. The extensive seafood menu includes bouillabaisse, lobster thermidor and steaks. The two menus shown here are from the two separate restaurants on the Lt. Robert E. Lee. Dixieland music in the lounge every Tuesday through Saturday."
The two restaurants were known as the Lt. Robert E. Lee Seafood Restaurant and the Sternwheeler, which mainly featured steaks. The bouillabaisse was $7.95 and lobster thermidor $8.25; over on the steak side, prime rib was $7.50 for the smaller Delta Queen cut and $8.95 for the giant Natchez cut. Sodas were 40 cents, desserts a buck.