Monument No. 210, looking southwest, near the Gray's Well area west of Yuma, Arizona. Although early monuments were equipped with flagpoles, this pole is used to mark the boundary under shifting sands. Even with the extension, the monument is often…
Siphon drain split into two tunnels. Water from the Alamo River flows into the left tunnel, while light is visible at the end of the right tunnel. Markings have been engraved on the top of the drain and right wall.
Irrigation canals are spread throughout the border area. This view is as the intersection of the Alamo River and the All American Canal, at Monument Number 218, looking east. The canal acts as an artificial boundary directly parallel to the border…
View looking toward the spot where the first irrigation water from Colorado reached the Imperial Valley in 1901. Tire tracks lead towards a fence. Near the fence's gate, a sign reads: "".