on March 31, 2020, and measured 6.5 on the moment magnitude scale and had a maximum Mercalli intensity of VII (Very strong). The quake has had numerous aftershocks of 2.5 or greater. The aftershocks have continued through early August 2020. See 2020 Central Idaho earthquake See Borah Peak: 1983 earthquake Glaciology Sawtooth National Forest has a history of alpine glaciation that is most obvious in the Sawtooth Mountains, and while no surface glaciers exist today, perennial snow fields and rock glaciers remain, usually on north or east facing slopes. There have been 202 perennial snow fields mapped in the Sawtooth Mountains, and while none have been mapped elsewhere on the forest, some may still exist in the Boulder, Pioneer, and White Cloud Mountains. The Sawtooth Mountains were last extensively glaciated in the Pleistocene, but glaciers probably existed during the Little Ice Age, which ended around 1850 AD. Evidence of past glaciation is abundant in the Sawtooth, White Cloud, Boulder, and Smoky mountains, as well as the north and east-facing slopes of the Albion, Raft River, and Soldier mountains. Remnants of the glaciers include glacial lakes, moraines, horns, hanging valleys, cirques, and arêtes. Climate Much of Sawtooth National Forest receives less than of precipitation a year, with higher elevations typically receiving more precipitation. Summer and early fall are usually drier than winter in most of the forest, while in the lowlands of the Minidoka District, such as near Oakley, the spring may be the wettest season. Winter snowfall provides a steady water supply to the streams during the summer. Locally, climate may depend on mountains that block moist air and river valleys that can funnel weather systems. Dry lightning is common in summer and fall. The growing season ranges from 150 days in the lower valleys to less than 30 days in the highest alpine areas. The climate charts below are ordered (left to right) from highest to lowest in both latitude and elevation. Human history Spear points dating to 12,000 years ago document the earliest presence of Paleo-Indians in the area, and there are nearly 1,500 known heritage sites in the forest. After AD 1700, the Shoshone, also known as the Sheepeater people, as well as the Bannock and Northern Paiute tribes, harvested fish, game, roots, timber, tubers, and rocks for tools while living in small groups at the northern end of the forest. Trappers and explorers arrived in southern