Was Robert Fulton's Clermont the first steamboat capable of carrying heavy loads upstream?

Yes, Robert Fulton's Clermont, launched in 1807, is often credited as the first commercially successful steamboat capable of carrying heavy loads upstream. It demonstrated the viability of steam-powered navigation on rivers, significantly impacting transportation and commerce. While there were earlier steam-powered vessels, the Clermont's successful operation marked a pivotal moment in the development of steamboat technology.