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

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

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

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

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

Dry Colorado River bed below the canal, ca.1903 

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

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

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

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

Men constructing a bulwark o the Colorado River, ca.1903 

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

Small outboard stranded on a sandbar in the Colorado River, ca.1900 

View of Glen Canyon on the Colorado River showing a row boat in the water, ca.1900-1950 

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

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

Portrait of a Chemehuevi Indian boatman on the Colorado River, 1903 

Great Falls on the Little Colorado River, ca.1900