March 31, 2020 Earthquake: Custer County, Idaho, United States
A magnitude 6.5 earthquake struck Custer County, Idaho, United States on March 31, 2020 at 23:52:30 UTC, 12 km below the surface.
Map
Where it struck, with the other significant earthquakes within 200 km. Circles are sized and colored by magnitude; select one for its page.
The earthquake
- Date
- March 31, 2020
- Time
- 23:52:30 UTC
- Place
- Custer County, Idaho, United States
- Magnitude
- 6.5 (Mw)
- Focal depth
- 12 km (7 mi)
- Intensity
- 6 on the Modified Mercalli scale
- Tsunami
- None recorded
- Epicenter
- 44.465° N, 115.118° W
- Country
- United States
The toll
- Damage
- Limited (under about $1 million)
Where the literature gives no number, NCEI records a description on a scale of 1 to 4, printed here in its words. Damage is in millions of US dollars of the year of the event, not adjusted for inflation.
What the record says
NCEI’s account, from the sources it cites.
Some damage to the Custer County courthouse and the Road and Bridge services building at Challis. Several avalanches and rockslides occurred on Highway 21 between Stanley and Lowman. A seiche was observed in a swimming pool in northern Utah.
Lowman, ID, US - CDI: 6; Stanley, ID, US - CDI: 6; Eden, ID, US - CDI: 6; Pollock, ID, US - CDI: 6; Dell, MT, US - CDI: 6
Other significant earthquakes nearby
Within 200 km, the deadliest first.
More
Significant earthquakes of 2020The 2000sEvery quake the USGS located in 2020Recent earthquakes near hereThis day in weather history
Sources
Significant earthquakes from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI earthquake 10967.