Seth Tanner, an early Mormon pioneer, improved this prehistoric Indian footpath in the 1880s. His pack trail provided access to mining claims along the river in the Palisades Creek area. At one time the route was part of the Horsethief Trail. Outlaws stole horses in Utah and drove them down the Nankoweap Trail to a low-water ford across the Colorado River. After altering brands, they moved the horses up the Tanner Trail to the South Rim and sold them farther south to unsuspecting ranchers.