Be aware that whatever the season, if you're at a high altitude, the weather can change quickly and dramatically. Temperatures The coldest month in Austria is usually January.
However, while many (but not all) canyons are found offshore from major rivers, subaerial river erosion cannot have been active to the water depths as great as 3000 meters where canyons have been mapped, as it is well established (by many lines of evidence) that sea levels did not fall to those depths.anyons cutting the continental slopes have been found at depths greater than 2 km below sea level. Many submarine canyons continue as submarine channels across continental rise areas and may extend seawards for hundreds of kilometres onto the abyssal plain.
Phantom Ranch is a place where nature, culture, and history mingle deep in the heart of the Grand Canyon. Trails from the North and South Rim meet here. The only two bridges across the Colorado River for hundreds of miles span across the gorge near Bright Angel Creek.