Start of the Alamo Canal

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Eastern end of the Alamo Canal. The canal was constructed mostly in the riverbed of the old Alamo River (to the west of the outline), which river was essentially a delta arm of the Colorado River. The Alamo Canal had several different start points along the Colorado River, and ended at Sharp's Heading, where the water was divided into various canals to provide irrigation & domestic water for the newly developed Imperial Valley.
In the early 1900s, the entire flow of the Colorado River was accidentally diverted into the Alamo Canal for a yr or two, which flow created the Salton Sea (which previously had been dry for at least several hundred yrs).

Alamo Canal was also known as (& shown on many old topos as) the Imperial Canal.