The Colorado is from 75 to 400 or 500 in the canyons and from 1200 to 1500 in the valleys.

In the Granite Gorges there are points where the distance between the buttresses at the water is no more than 50 feet.

In Marble Canyon there are a dozen places where the width is not over 60 to 75 feet.

The depth varies from several feet to an unknown quantity in the narrow parts.

There is also a variation of depth with the year and the season.