1971 Map of Philip Smith Mountains B-4

About this map

The Atigun River and the Sagavanirktok River dominate this portion of the Philip Smith Mountains, providing a look at industrial expansion in the North Slope during the 1970s. A primary point of interest is the inclusion of The Trans-Alaska Pipeline (Under Construction), shown alongside a related Pumping Station as it was being carved through the Arctic landscape. The river corridors dictate the movement through this high-latitude terrain, with the Atigun passing near Galbraith Lake and through a distinctive Gorge in the north. The survey reflects a transitional moment for the region, where traditional topography meets massive energy infrastructure. Purple revisions from 1975 aerial photography highlight changes made just before the final publication, documenting the rapidly evolving footprint of the pipeline corridor.