[Lmo56]

Thats assuming that the Mountains were at the same height during the flood. I tend to believe that the continents broke apart during the flood and the mountains raised up in the aftermath of the flood which would probably have included massive volcanic and tectonic activity.

I'm wondering if a glacial dam may have burst ...

Saw a show on PBS that stated there was a MASSIVE pre-historic lake dammed up with a glacial wall. Thousands of trillions of gallons ...

When it broke, it raced to the West Coast [forming the Columbia River] and into the Southweat, where it carved out Monument Valley ...

Same thing in Europe ???

[BrandtMichaels]

Your getting warmer. Try a global flood followed by hundreds maybe even thousands of local floods. One is going on right now with Niagra Falls. Creationscience.com

[dschapin]

I don’t know about Europe. However, I agree with you about the Columbia - though I think that the lake which broke out through the Columbia Gorge was formed in a more recent era when the waters receeded after the flood and the mountains rose up. I think that a substantial amount of water became trapped in a massive lake between the Cascade Mountains and the continental divide. At some point a massive earthquake or other such activity must have started a breach at the gorge which uncorked the bottle. I think that the Grand Canyon was formed in a similar manner. At Mount Saint Helens in Washington state a miniture Grand Canyon was formed in the 1980’s when a lake which became trapped in the volcanic cone after the eruption later broke loose with an accompaning mudflow and cut a very complex canyon through layers that had been laid down in the previous eruption.