The local chamber of commerce bills Arco as being an important crossroads. It traces its history back to the Shoshone Indians that traveled through the area. The fur trappers came next and were quickly followed by immigrants traveling on one of the branches of the Oregon Trail. Today, Arco is the county seat for Butte County, Idaho. Although it is the largest community in the county, it is not very big by anyone's standards. Something like a thousand people live in town and the residents pretty much depend on the nearby Idaho National Laboratory for their economic well being. The INL is engaged in research related to the development of nuclear generating plants. Arco has the distinction of being the first community in the world to receive it's electricity from nuclear power. It is also one of the few towns where you will find the sail of a nuclear submarine in a community park.