Really BIG jpg (297KB) of the St. Louis Waterfront in 1907, from the Library of Congress. The panoramic photo is entitled President's Day on the river, St. Louis, Mo..CREATED/PUBLISHED c1907
NOTES Copyright deposit; Henry Stark; October 27, 1907.
Celebration of visit of Pres. Roosevelt who arrived on steamer "Mississippi".
Waiting for the download is certainly worth the effort, though. I tried to count the steamboats docked and out on the Mississippi, but gave up. I am sure that there are somewhere between 20 and 30 in view.
Use this link to find more LOC pictures Just enter the words steamboat and photograph in the search box and set it for match all of these words. (Searching just for steamboat will turn up lots of other good stuff, too, including the sheet music for Steamboat Bill.) The panoramic view of the Cincinnati waterfront, 1914, is good, too. Look carefully at the left panel ~~ just below the bridge you will see a steamboat just about to pass under.