Why water unfrozen under bridge?


Why is it that the rest of the river is frozen while the water under the bridge is not frozen? If anything, the water under the bridge should remain frozen, because it’s hidden from sunlight.

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laura k.
laura k.
20 years ago

but snow only falls on the exposed parts, hence adding coldness to the water. i don’t think sunlight has much warming effects – it doesn’t do much for the land snow.

laura k.
laura k.
20 years ago

i’m disappointed at the lack of additional theories postulated here to explain this phenomenon.

Dave Rothkopf
Dave Rothkopf
20 years ago

Bridges flow over troubled water. Thus, the troubled — or turbulent water — can’t stay still to form into ice. -D

Jeremy
Jeremy
20 years ago

I know why! The sun melted the ice on the bridge and the run off was just warm enough to melt the ice under it.

laura k.
laura k.
20 years ago

do they still have those weird magenta lights under the bridges? maybe the heat from those melted the ice.

Tom Saaristo
Tom Saaristo
20 years ago

The lights are green now. Wrigley even had some installed behind their building so practically the whole thing is one giant green monster. The lights melting the snow is a curious concept. I’d be willing to look into that a little further, especially since I haven’t come up with my own theory.

Tom Saaristo
Tom Saaristo
20 years ago

o

laura k.
laura k.
20 years ago

maybe there are electric eels under the water that heat up the ice.

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