These are remains of a plank road that was built in 1915 to run through the Algodones Dunes as part of a highway connecting Yuma and San Diego. The road was only one lane wide and provided a rough ride. Work crews fought the elements for 10 years to keep the road open before the road was replaced with a concrete road built on top of a sand embankment.
My visit was short (and my photos fuzzy) because the setting sun was taking away my light.