Construction of the Imperial Canal head gate apron on the Colorado River, Sharps, ca.1903 

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

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

Looking up the Colorado River from an island near where it enters the Imperial Canal, ca.1903 

The unsuccessful Coffer Dam under construction at the Lower Intake of the Colorado River, ca.1903 

Dry Colorado River bed below the canal, ca.1903 

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

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

Entrance to Beltram Slough near the Colorado River, ca.1903 

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

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

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 

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

Sand bars on the Colorado River below Yuma, 1900-1950 

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

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

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

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

A desert dwelling in Imperial Valley, California, ca.1900 

Construction workers on the Imperial Heading below Yuma, Arizona, [s.d.]