HK team’s substantial improvements to the road include: 1) widened 4 miles of road to a 22-foot minimum width by excavating 75,000 cubic yards of material hauling 31,000 tons of road base, 14,500 tons of asphalt and 6,000 cubic yards of riprap 2) installed 4,700 ft of guardrail and 22 culverts 3) constructed mechanically-stabilized earth walls with materials including 12,300 square feet of welded-wire facing and a combined 9,000 cubic yards of select granular backfill and cobble rock facing and 4) installed a pinned mesh wall with 632 soil nails ranging from 10-40 feet in length. The estimated (to-date) cost of the project is $21 million. On June 24, 2022, compliance to improve the Old Gardiner Road was completed, a contract was awarded to HK Contractors, INC, and work began on July 5.
Constructed in 1879, the Old Gardiner Road was the original entrance road to Yellowstone until it was replaced in 1884. Two days after the flood, National Park Service (NPS) crews began hauling and applying 20,000+ tons of gravel to establish a passable one-lane along an historic dirt road. This road and the North Entrance are open year-round and serve as the only winter vehicle access in and out of the park. High water during the flood event destroyed the North Entrance Road in several places, which cut off access to Yellowstone via the North Entrance in Gardiner, Montana. A new wastewater treatment system is being built to serve the Mammoth area with an anticipated spring 2023 completion. Staff quickly rerouted the wastewater into percolator ponds used between the 1930s and 1960s, allowing for summer day-use visitors and residents to stay in the area. 10/30, Opened Temporary North Entrance Road to the public.Ī sewer line adjacent to the road that carried wastewater from Mammoth Hot Springs to a sewage treatment plant in Gardiner ruptured.10/15, Opened Northeast Entrance Road to the public.8/8, Started work on Northeast Entrance Road repairs by Oftedal Construction, INC.7/26, Finalized temporary Northeast Entrance Road designs and awarded contract to Oftedal Construction, INC.7/11, Finalized temporary Temporary North Entrance Road designs and awarded contract to HK Contractors, INC.7/5, Started work on Temporary North Entrance Road after Diverting HK Contractors, INC from Old-Faithful-to-West-Thumb project.7/1, Finished NPS improvements to Temporary North Entrance Road allowing for one-way employee traffic.6/29, Hosted senior officials from congressional committees, NPS, and FHWA visit to develop strategies around short- and long-term recovery efforts.6/21, Started temporary solution assessments to repair Northeast Entrance Road to Cooke City, Montana.6/17, Started planning and design for long-term reconstruction strategy.6/17, Provided additional $50 million in ERFO-QR funding.6/15, Started to improve Temporary North Entrance Road (Old Gardiner Road) with National Park Service (NPS) roads crews.6/14, Provided $10 million in Emergency Relief Federally Owned Roads - Quick Release (ERFO-QR) funding.6/14, Conducted initial damage assessments by resident Federal Highway Administration (FHWA) engineers.As repairs continued, additional sections of road and backcountry trails opened throughout the summer. The south loop of the park reopened on June 22, 2022, nine days after the flood event. Within 48 hours, the park restored power, diverted severed wastewater lines, and planned for recovery and resumption of operations when and where possible. Within 36 hours of the event, the park evacuated all visitors in developed areas and conducted initial damage assessments. The park immediately set a range of life and safety objectives to ensure all employees and visitors were safe and accounted for, restore power, divert damaged wastewater systems, and help local communities with emergency response. The flood destroyed several sections of the North Entrance Road between Mammoth Hot Springs, Wyoming, and Gardiner, Montana, and three sections of the Northeast Entrance Road between Lamar Valley and Cooke City/Silver Gate, Montana. Northern parts of the park received a combined 7.5-9.5 inches of rain and snowmelt in a 24-hour period. On the morning of June 13, 2022, Yellowstone experienced a 500-year flood event.
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