I am trying to identify this side paddle wheel steamer. Looks like a wedding party just forward of the sail. Can't ID the flag. Image/photo is gelatin silver so early 1900s most probably.
I believe this is the "Clermont" replica, built for the 1909 celebration.
The original Clermont the first steamboat built by Robert Fulton, of the Hudson-Fulton Steamboat company, which ran in New York up the Hudson river. It was the first commercially successful steamboat operated on the Hudson, or North River.
The flag being flown from the leading mast appears to be the Hudson-Fulton flag, details of which can be seen on this page.
The Clermont was a North River steamboat.