Gravity is one of a number of factors that affect current–generally the tendency is for water to move downward. But currents also have to do with the topography of the river, relative water density, and quite a few other things.
I’ll quote the relevant line from that citation link, since it’s somewhat difficult to pick out: “A body of water moving in a certain direction and caused by wind and density differences in water. The effects of a current are modified by water depth, underwater topography, basin shape, land masses, and deflection from the earth’s rotation.”
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