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The land beneath the GC swelled upward WHILE it was being carved. (Unless you believe the water flooded uphill for some reason.) This was certainly a process which took millions of years. Perhaps someone misunderstood something, and then misapplied his understanding: I can see where the initial gorge was created like that, allowing the river to form a canyon, rather than as a meandering riverbed.

Like I said, thats the official storyline. The USGS has been mapping prehistoric stream bed alluvials. As you are aware when a stream dumps water into a lake it deposits a "delta" kind of thing. These "delta's" are found all around the rocky at approximately the same elevation. When these formations were mapped out they indicated a body of water at least as large, as the great lakes. I don't recall the they were talking about surface area or volume. Anyway, it was a really big lake.

The problem, as I see it, is that many are hung up on "millions of years", because they feel that that is their only argument against creation. Thus any new idea, that doesn't include "millions of years" is considered as a personal attack against their beliefs. Even if the GC took only 3 months to a year to cut, initially. It still would have to be taken in its overall context.

It's not the "official" story line. It's physics, plain and simple. The top ridge - even on the low side - of the canyon is higher in some places than it is in some others that are further upstream. The presence of such an enormous lake doesn't change that. Even post-glacial rebounding -- which is not what happened -- takes thousands of years. Continental uplift takes millions.

Plus, its also basic physics that erosion through sandstone -- no matter how much water is flowing -- does not occur at a rate of a couple thousand feet per month, which is what you are describing.

(A great Lake, once filled the entire Nevada Basin, and had an outlet... It's only remnant is the Great Salt Lake. I don't know if it flowed out the Colorado River, but that'd seem like a likely candidate. Is this what you are referring to?)