Atomic Idaho / Arco
Arco’s Atomic First
Arco marks the moment a small Idaho town became part of nuclear history when atomic energy powered its lights in 1955.
- Category
- Atomic Idaho
- Era
- 1955
- Coordinates
- 44.5250, -114.2086
- Highway
- US 20/26
Map
Map locations are for illustrative planning only. Check the original source records, posted signs, land ownership, closures, and current conditions before visiting.
Why It Matters
It is a compact roadside reminder that Idaho’s desert became one of the country’s most important nuclear testing and reactor landscapes.
Marker record title: Atoms for Peace.
- Marker Number
- 152
Source: Idaho Transportation Department Historical Marker Hub. This page summarizes public marker data and adds editorial context.
Nearby records
Other Idaho Points of Interest
Primary source: Idaho Transportation Department Historical Marker Hub.