the case of a fire. The 10-member Sawtooth Helitack crew was established in 1963 and is based at Friedman Memorial Airport in Hailey. In the case of larger fires, the National Interagency Fire Command can quickly mobilize available resources. Only four of the original fire lookout towers remain standing in the forest, but they are no longer in use: Iron Mountain, Horton Peak, Lookout Mountain, and Mount Harrison, which was last fully staffed in 2007. Many of these towers were built by the Civilian Conservation Corps during the Great Depression. Geography and geology The elevation in the forest ranges from at Rock Creek south of Twin Falls to above sea level at the top of Hyndman Peak, an elevation gain of . The mountains of the Minidoka District are part of the Basin and Range Province, while those in the northern section of the forest are part of the Rocky Mountains. The Sawtooth Mountains have at least fifty peaks over . The mountains of Sawtooth National Forest have a varied geological history. The northern Sawtooth Mountains formed from the Eocene Sawtooth batholith, while south of Alturas Lake the Sawtooth, Smoky, and Soldier mountains formed from the Cretaceous granodiorite of the Idaho Batholith. Foothills of the Smoky Mountains are from the Pennsylvanian and Permian Dollarhide formations. The White Cloud Mountains are underlain by the gray granodiorite of the Idaho batholith, while some of the exposed rock is baked impure limestone from the Permian Grand Prize Formation. The central mass of the Raft River Mountains consists of Precambrian metamorphic rocks with Elba quartzite and interlayered schist on the southern slopes and Cambrian quartzite outcrops on the western part of the range. Below the Sublett Mountains the Phosphoria Formation, a basal phosphorite overlain by a thick sequence of chert and cherty sandstone, reaches its greatest thickness. Soils in the northern part of the forest are generally deep and highly fertile in lowlands but shallow and less so on steep slopes. In the Minidoka Ranger District, soils are generally productive, derived from volcanic and sedimentary material, shallow on steep slopes, and deep in the lowlands. The Boulder, Pioneer, Sawtooth, Smoky, and White Cloud mountains are generally jagged, while the ranges on the Minidoka District, the Albion, Black Pine, Raft River, and Sublett mountains, are generally smooth and rolling. Galena Summit is a mountain pass at on State Highway 75 between Stanley and Ketchum, roughly