The Salmon River Scenic Byway uses both highways, from Stanley to Salmon. The junction with Highway 75 is south of Challis.
1983 earthquake
On Friday, October 28, 1983, the Borah Peak earthquake occurred at 8:06 am MDT. The shock measured 6.9 on the moment magnitude scale and had a maximum Mercalli intensity of IX. The Challis-Mackay region experienced rather thorough damage, with 11 commercial buildings and 39 homes with major damage; while another 200 houses were damaged, minor to moderately. Mackay in particular, about southeast of Challis, experienced the most severe damage. Most of the city's large buildings on its Main Street were damaged, to some extent; eight of these buildings were deemed condemned and closed down. Most of these buildings were built from materials such as brick, concrete block, and stone, each varying. The two fatalities of the earthquake were in Challis; a store front fell on two children walking to school.
2020 earthquake
On Tuesday, March 31, 2020 at 5:52 pm MST, an earthquake measuring 6.5 on the moment magnitude scale occurred, centered west of Challis. This was the second strongest earthquake in the state of Idaho ever recorded.
Geography and climate
Challis is located at , at an elevation of above sea level. According to the United States Census Bureau, the city has a total area of, of which, is land and is water. Challis experiences a semi-arid climate with cold winters, hot summers, and low precipitation throughout the year.
Demographics
2010 census
At the 2010 census there were 1,081 people, 502 households, and 277 families living in the city. The population density was. There were 598 housing units at an average density of. The racial makeup of the city was 93.6% White, 0.1% African American, 0.8% Native American, 0.3% Asian, 3.5% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 7.2%. Of the 502 households 26.7% had children under the age of 18 living with them, 43.4% were married couplesliving together, 7.2% had a female householder with no husband present, 4.6% had a male householder with no wife present, and 44.8% were non-families. 39.0% of households were one person and 15.6% were one person aged 65 or older. The average household size was 2.14 and the average family size was 2.84. The median age was 42 years. 21.3% of residents were under the age of 18; 6.7% were between the ages of 18 and 24; 26.3% were from 25 to 44; 28.5% were from 45 to 64; and 17.2% were 65 or older. The gender makeup of the city was 55.0% male and 45.0% female.
At the 2000 census there were 909 people, 410 households, and 248 families living in the city. The population density was 510.8 people per square mile. There were 525 housing units at an average density of 295.0 per square mile. The racial makeup of the city was 97.14% White, 0.88% Native American, 1.21% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 3.85%. Of the 410 households 29.0% had children under the age of 18 living with them, 52.4% were married couples living together, 5.1% had a female householder with no husband present, and 39.3% were non-families. 35.6% of households were one person and 17.6% were one person aged 65 or older. The average household size was 2.21 and the average family size was 2.90. The age distribution was 25.0% under the age of 18, 4.7% from 18 to 24, 26.0% from 25 to 44, 24.9% from 45 to 64, and 19.5% 65 or older. The median age was 42 years. For every 100 females, there were 98.0 males. For every 100 females age 18 and over, there were 94.3 males. The median household income was $29,904 and the median family income was $39,444. Males had a median income of $38,250 versus $21,964 for females. The per capita income for the city was $15,803. About 8.5% of families and 12.7% of the population were below the poverty line, including 8.2% of those under age 18 and 18.5% of those age 65 or over.
