draft--LANDMARKS FOR THE WEST EXIT OF THE GRAND CANYON--draft
There is general agreement to use River Mile 277 as the length of the Grand Canyon. The actual location for RM 277 has changed, and it is appropriate to determine landmarks near the Colorado River that make it easy, topographically and geologically, to recognize an end point, the exit from the Grand Canyon.
(Note: The boundary of Grand Canyon National Park (GCNP) in this western end includes lands that are not in the Canyon’s drainage, but flow further west into Lake Mead.)
Fortunately, such landmarks do exist, and can be tied into the landforms that delineate the divides on the north and south sides of the river for the final drainages into the Canyon.
