Expeditions & surveys; Railroad surveys; Springs; Bitterroot Range
Near the summit of the Bitter Root Mountains, "a hot spring with a temperature of 132 degrees, around which was a fine prairie camping ground." Plate LVII.
Concrete construction; Grand Coulee Dam (Wash.);Hydroelectric power plants -- Washington (State);Dams -- United States -- Design and construction.
Portions of the foundation level of Grand Coulee Dam have been poured, others remain to be poured. In the foreground, cooling coils are visible. These were required to maintain the desired temperature for optimum curing of the concrete.