M 6.5 earthquake west of Challis, Idaho about 75 miles (120 km) northeast of Boise.
According to the USGS, this is the largest earthquake in Idaho since the Borah Peak earthquake in 1983. That event killed 2 in Challis, and resulted in over $12M in damage in the Challis-Mackay area. As of 1 hour after this earthquake, two aftershocks (M 4.6, M 3.6) have been located by the USGS, both to the south of the M 6.5 event.
The earthquake was just over six miles deep when it struck.
KHQ has gotten reports of people feeling the earthquake as far away as Spokane, Washington, Coeur d’Alene, Idaho, and Missoula, Helena, and Great Falls, Montana.
Thanks to Laurel for these links