I'm sitting here in a coffee shop on the local river and I noticed it was just wide enough to facilitate a landing. There is no chop on the river, but it does move pretty switfly, and there are bridges and whatnot that would quickly come into play. However, there are some pretty slow-moving, unobstructed rivers out there.
Does anyone land floatplanes on rivers for reasons other than emergencies?
They absolutely can and do on a regular basis. River currents will play a significant role in takeoff and landing considerations as well as during displacement taxiing, casting off, docking and mooring of the airplane. But it does happen on a regular basis.