2015 Map of Big Maria Mountains SE

About this map

The Colorado River forms a winding natural boundary between California and Arizona in this 2015 study, carving a path through the arid landscape of Parker Valley. The map highlights the river's dynamic geography, showing significant features like Halfway Bend and the presence of river landforms including Horse Island and Hall Island. A protective Levee runs along the eastern bank, shielding the low-lying valley from the river's influence. To the west, the terrain rises sharply from the desert floor, while the valley itself is gridded with local access roads such as Tsosie Rd and Wind River Rd. This interface between the river's edge and the high desert is further marked by Black Point, anchoring the southern reaches of the valley. The presence of newer residential naming conventions, such as Villa Shores Dr and Quail Trl, indicates the modern development pattern along the river corridor.