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Introduction

This is a spot along the Lolo Trail, a trail that the Nez Perce Indian traveled from eastern Washington and Idaho to the Buffalo hunting grounds in Montana. It is suspected that these rock cairns were trail markers of sorts.

The Lewis & Clark Expedition traveled the Lolo Trail in 1805/06. The Lolo Motorway trail marker has this interpretation.

"None of the Lewis and Clark Expedition accounts mentions the presence of rock cairns at this place leading us to believe the route they followed left something of interest. No one has verified what purpose the cairs may have once served. Other mounds of rock can be found elsewhere along the Lolo Trail. Some believe these cairns marked a dividing trail off the main ridge trail. Others say these cairns were a place for early travelers to leave messages for those who would follow. This ara was named Indian Post Office in the early 1900s."