How to use the Idaho Highway Historical Marker Guide

The Idaho Transportation Department and the Idaho Historical Society began promoting the historical heritage of Idaho through the use of highway markers in 1956. Before the organization of this program, historical markers of various shapes and sizes were installed through the efforts of private organizations or by relatives of the pioneers. In most cases, these markers were installed, properly dedicated and then left to the elements and vandals. The new program organized, standardized and maintained the state's historical markers.

The Idaho Historical Society proposes sites and prepares information for the signs. The Idaho Transportation Department directs the preparation, location, installation and maintenance of the four-foot by eight-foot wooden signs.

The signs are located at roadside turnouts or near other available parking so that you will not have to park on the shoulder of the highway to read them. Road signs announcing the historical markers are typically posted about 1,000 feet in advance of the site to provide an opportunity to slow down and turn out safely.

The program was revitalized in 1986 with the installation of over 100 new signs in preparation for Idaho's centennial celebration of statehood in 1990. There are now 244 historical markers along the gem state's highways.

For comments, suggestions and corrections, e-mail the Office of Communications at: comments@itd.idaho.gov.