Walking along the Red River recently, I was observing chunks of ice flowing downstream and toward the north. Once frozen, the visual motion of the river will stop for the winter. Its hard surface will give the appearance of a thing at rest.
However, underneath the frozen river surface, the Red River will continue to flow all winter long.
The northward motion of the Red River is not as singular as many of us have been led to believe. The Kennebec and the Penobscot Rivers in Maine both flow to the north as well as the Willamette River in Oregon, to name a few. The Nile River in Africa flows north and there are many others.
The only reason most rivers flow southward is because the slope of the entire Mississippi watershed is to the south. This is merely a feature of American geography and not a strange adjustment to any law of physics. Water flows downhill, whatever compass direction that happens to be. Even north.