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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Old Yellowstone Trail South Improvements and Preservation

Project Description:

Old Yellowstone Trail South (OYTS) is a roadway and trail of the same name located in Park County, Montana. OYTS provides access to the Custer Gallatin National Forest (CGNF), YNP and the world famous Yellowstone River along the entire corridor.

The proposed project area is an approximately 7.7 mile-long corridor starting at Arch Park and terminating at Cinnabar Bridge.  The scope includes road gravel resurfacing and rehabilitation, drainage improvements and culvert installation

Project Partners:

  • Park County
  • Yellowstone National Park
  • United States Forest Service
  • Federal Highway Administration – Western Federal Lands Highway Division

Anticipated Timeline

Project Design and Permitting: Fall 2023 – Summer 2025
Advertise and Award: Fall 2025

Construction: Spring/Summer 2026

Project Photos