Macomb’s Expedition 171 
eighty-three years previously. Dr. Newberry, the eminent 
geologist who had been with Ives, was one of this party, and 
he has given an interesting account of the journey. The 
region lying immediately around the place they had set out 
for is one of the most formidable in all the valley of the 
Colorado. Looking about one there, from the summit of the 
Fort Yuma and the Old Railway Bridge of the Southern Pacific. 
Photograph by C. R. Savage. 
canyon walls, it seems an impossibility for anything without 
the power of flight to approach the spot, except by way of the 
river channels. Macomb and Newberry succeeded in forcing 
their way to within about six miles of the junction, there to 
be completely baffled and turned back. Arriving finally at 
the brink of the canyon of Grand River, Newberry says; 
