Wood Howe truss bridge across the Alamo River below Holtville, Imperial County, California, ca.1910 

On the Alamo River, two days from the Salton Sea, ca.1910 

Small ferry boats moored along the Colorado River near Giers, California, 1906 

Dr. George Wharton James and five others pulling themselves across the Colorado Chiquito River by cable ferry, ca.1900-1903 

Yuma, Arizona, with a bridge over the Colorado River, ca.1900 

The headgate on the Imperial Canal at Sharps Heading, California, ca.1910 

Large group of men working on a new headgate on the Colorado River, ca.1905 

Two covered wagons fording the little Colorado River beside a cable ferry, 1903 

Two men raising (or lowering) a flag in front of the Mexican Custom House, just below the first heading of the Colorado River, near Mexicali, ca.1910 

Mesquite forest near the Colorado River, California, ca.1910-1920 

Men and horses work on the levee on the south bank of the Canal near the Colorado River, ca.1903 

The Colorado River in one of the Mojave canyons, California, 1900-1950 

Looking east on the Colorado River at the rapids above Bass's Ferry, Grand Canyon, ca.1900-1930 

Bridge across the Colorado River in Blythe, ca.1900-1950 

Yuma Indian dwellings near the Colorado River on the Yuma Indian reservation, ca.1900 

Canal congested with water from the Colorado River after five unsuccessful attempts at channeling the river, ca.1903 

Three men in the Mexican Custom House, just below the first heading of the Colorado River, near Mexicali, ca.1910 

Canal full with water from the Colorado River, ca.1903 

Entrance of the Havasu River into the Colorado River, Grand Canyon, 1900-1930 

Dry Colorado River bed below the canal, ca.1903