The ice dam itself is some two and half miles across.

Another potential source of winter problems is an ice dam.

Since ice dams often form under the snow, they are sometimes difficult to spot.

Maybe ice dams, but since this house isn't used in the winter that's probably not it.

They were often caused by ice dams blocking the river.

"The water has some way to rise before it tops that ice dam."

Then, suddenly, like an ice dam bursting, it was too much.

Its cause was the sudden release of a massive, 4-mile-long ice dam.

The lake was held back by an ice dam of the remaining glacier.

The rising lake waters finally broke out from the ice dam.

Ice dams can form when snow collects on the roof.

In the other process, ice dams create the lakes.

How can you tell if ice dams are forming?

It would be safer if they returned there, away from the collapsing ice dam itself.

If they do not extend onto the heated part of the roof, the ice dams can form above them.

Most insurance policies cover backups from ice dams, insurers say.

An ice dam, on a smaller scale, is a problem of house and building maintenance in cold climates.

The ice dam burst open months later with a catastrophic flood, even larger than the one this August.

Many deposits on this plain result from ice dams.

This will keep water from seeping under the shingles if an ice dam forms.

Nowadays, explosives dropped from aircraft are used to break the ice dams before they become dangerous.

Moreover, though much of the ice is now melted, ice dams could quickly return with more snow.

When ice dams climb more than three feet up the roof, leaks can occur above the shield line.

While volunteers tried to catch seals to carry them to safety, many skittered across the ice dam on their own.

The containment field collapsed around us, and noise flowed in like water over a melting ice dam.