North River Steamboat - Wikipedia

On September 4, 1807, Robert Fulton begins operating his steamboat. From the article:

The steamer's inaugural run was helmed by Captain Andrew Brink,[2] and left New York on August 17, 1807, with a complement of invited guests aboard. They arrived in Albany two days later, after 32 hours of travel time and a 20-hour stop at Livingston's estate, Clermont Manor. The return trip was completed in 30 hours with only a one-hour stop at Clermont; the average speed of the steamer was 5 mph (8 km/h).[3]

Fulton wrote to a friend, Joel Barlow:[2]

I had a light breeze against me the whole way, both going and coming, and the voyage has been performed wholly by the power of the steam engine. I overtook many sloops and schooners, beating to the windward, and parted with them as if they had been at anchor. The power of propelling boats by steam is now fully proved. The morning I left New York, there were not perhaps thirty persons in the city who believed that the boat would ever move one mile an hour, or be of the least utility, and while we were putting off from the wharf, which was crowded with spectators, I heard a number of sarcastic remarks. This is the way in which ignorant men compliment what they call philosophers and projectors. Having employed much time, money and zeal in accomplishing this work, it gives me, as it will you, great pleasure to see it fully answer my expectations.

The 1870 book Great Fortunes quotes a former resident of Poughkeepsie who described the scene:[4]

It was in the early autumn of the year 1807 that a knot of villagers was gathered on a high bluff just opposite Poughkeepsie, on the west bank of the Hudson, attracted by the appearance of a strange, dark-looking craft, which was slowly making its way up the river. Some imagined it to be a sea-monster, while others did not hesitate to express their belief that it was a sign of the approaching judgment. What seemed strange in the vessel was the substitution of lofty and straight black smoke-pipes, rising from the deck, instead of the gracefully tapered masts that commonly stood on the vessels navigating the stream, and, in place of the spars and rigging, the curious play of the working-beam and pistons, and the slow turning and splashing of the huge and naked paddle-wheels, met the astonished gaze. The dense clouds of smoke, as they rose wave upon wave, added still more to the wonderment of the rustics.

Scheduled passenger service began on September 4, 1807. Steamboat left New York on Saturdays at 6:00 pm, and returned from Albany on Wednesdays at 8:00 am, taking about 36 hours for each journey. Stops were made at West Point, Newburgh, Poughkeepsie, Esopus, and Hudson; other stops were sometimes made, such as Red Hook and Catskill. In the company's publicity the ship was called North River Steamboat or just Steamboat (there being no other in operation at the time)."