I like Lake Powell archeology too. I was led to understand that the road they are following the grade of was first built by coconino county in early 50’s to facilitate ranchers getting down to the creek. I think that later the same road was used or others were built or both to get aggregate for the dam. Anyone else hear that?
As much as the site for the dam was selected for how much water it would back up and for how narrow a spot it could be placed in was the consideration for supplies to make the best concrete possible. The aggregate was trucked up to the top and processed above what is now the boat rental area near Wahweap Marina. On google earth the road that leads from the intersection by the Wahweap hotel to over in front of the Campground and then over to Stateline parking area is labeled something like Concrete Road and shows a whole system of what are now abandoned roads. I spent some time driving and walking around what’s left of them, some were paved and have weeds growing up through them.
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You may recognize this area which is in Wahweap Bay. It’s that curious man made hill just North West of the Boat Rentals dock if you are headed to Lone Rock Beach. Sand King is behind it in this photo looking East. I think what is spilling over the conveyor could be termed reject chips, smaller pieces than they wanted after crushing and processing. There is now a well that draws water for the hotel and marinas sunk into this material up top which acts as a filter to draw the water from the lake, as I understand it. Boat Rentals is just around this corner to the right with State Line and State Line Auxilary just beyond rentals.