In 2010; and the last time before that was 1987.
1938
1978
Never. The Amazon river is placed on a tropical rain forest which is warm all the time.
Yes, the St. Lawrence river freezes over each winter.
Yes and no. The waterfall itself does not freeze over. But with a prolonged freeze, an "ice bridge" may form in the river (below, I think).
Yes, it has, at least as far downstream as Washington DC. I don't have the the timeframe it occurred but I have seen photographs of it. Farther upstream it is not unusual for it to freeze over as far downstream as The Great Falls.
The Ganges is not said to freeze over. This river, the largest in India, is situated in a geographical area that is generally fairly warm throughout the year. The headwaters of the Ganges are difficult to specify, and those streams high in the Himalayans spring from water that is melted from glaciers or snow. Some of these will freeze in winter. The main flow of the Ganges will, however, never be so cold. A link can be found below to learn more.
Ice would begin to form on the surface- small chunks of ice, floating on the river as ice floes. It happens all the time in rivers in really frigid areas.
There are 221 bridges that go over the Mississippi
Keith Harkin is an Irish singer who is part of the group Celtic Thunder. He apparently lives in Ireland, but travels all over the world.
Freeze it.
Yes, fresh water, especially if it is not fast moving, will freeze. The Polar ice caps show that sea water freezes too.