National Geographic : 1941 Jun
Photograph byU.S.Bureau ofReclamation Man's Greatest Dam, Its Three Satellite Towns, and the Dry Site of a Future IrrigationReservoir Pack This Air View Laid out in the foreground is temporary Mason City. Across the Columbia River is "Engineers' Town" (CouleeDam). Beyond lies the hilltop town ofGrand Coulee. In the Ice Age a mammoth frozen barrier blocked the river gorge here. Its overflow carved the barren valley, Grand Coulee (upper right). There irrigation waters, lifted 280 feet from the new lake, will be stored. Steamboat Rock (upper center) will again become an island (pages 754, 771).