Yellowstone River Bridge

Project Description:

The Yellowstone River Bridge project is located at intersection of the Northeast Entrance Road and the Grand Loop Road (Tower Junction) in Yellowstone National Park. It will replace the existing 60-year old bridge on a new mile-long realignment of the Northeast Entrance Road.

The intersection at Tower Junction will be relocated 700 southeast of its current location. Approximately 1 mile of the Northeast Entrance Road will be realigned and nearly 0.5 miles of the Grand Loop Road will be reconstructed.

The new 1,285 long, 175 high steel girder bridge will have drilled shafts, concrete decking, sidewalks, and railing. It is located within a hydrothermally and geothermally active zone with multiple gas vents observed along the river s edge and will require sulfate resistant cement and thermal monitoring of below grade concrete curing.

The existing Northeast Entrance Road will be obliterated and regraded. Regrading includes restoration of:

Lost Creek to its natural creek channel and hydraulic system, aquatic, riparian and upland areas using living and nonliving plant materials, wetlands to pre-1960 s conditions, and the existing fish barrier with the installation of a new fish barrier.