The entire length of the route is designated as the Sacajawea Historic Byway by the state of Idaho.

[2] Idaho State Highway 28 begins at an intersection with ID 33.

The route heads northwest before passing the Mud Lake Airport, proceeding to an intersection with State Highway 22.

Just after exiting the town, the road travels parallel to the Lemhi River for several miles before ending at U.S. Route 93 in the community of Salmon.

[1] Media related to Idaho State Highway 28 at Wikimedia Commons