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Yellowstone National Park faces significant infrastructure challenges and maintenance needs, with its asset inventory valued at $8.5 billion. The inventory includes essential elements like roads, bridges, water and wastewater systems, maintained landscapes, heating and cooling plants, electrical systems, communication systems, fuel systems, a solid waste and recycling system, marinas, and amphitheaters. There is an estimated $47 million in annual routine maintenance requirements associated with the inventory, which is critical, as neglecting annual routine maintenance could accelerate deterioration of the portfolio.
The projects highlighted on this page have been identified as strategic priorities. These projects aim to address safety, regulatory compliance, and improve the visitor experience. However, these project estimates and timelines are subject to change based on evolving priorities, final scope and design efforts, and available resources. The following figures show Yellowstone’s real property inventory by asset category as of July 2026:
Continued investment in infrastructure and strong partnerships with federal, state, Tribal, philanthropic, and private stakeholders will be critical to preserving the park's natural and cultural resources and ensuring Yellowstone can continue serving millions of visitors for generations to come.
Some projects occur in multiple areas throughout the park and are not included on the map (learn more about these projects in the dropdown fields below):
Employee Housing Improvements - Lead Abatement, Phase 1 (ongoing)
Fire Hydrant Replacements - Phase 1 (approved)
Trails, Bridges and Cabins Replacements (approved)
Completed Projects (2020-present)
Roads and Bridges
Start Date: 2020 End Date: 2021 Cost: $3 million Fund Source(s): Federal Lands Transportation Program Locations: Grant Village and Old Faithful Project Description: This project corrected deficiencies in three timber bridges at Grant and one concrete overpass at Old Faithful. Work replaced rotted deck timbers, railing, and pier stiffeners and repaired concrete abutments, approach slabs, and curbing.
Grant Bridge
Before and After:
Old Faithful Interchange
Before and After:
Start Date: 2022 End Date (estimated): 2025 Cost (estimated): $37 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: South Entrance Road near Lewis Falls Project Description: This project is replacing a structurally deficient bridge along the heavily used South Entrance Road in Yellowstone. The project will improve visitor safety and include accessible parking and a viewing area of Lewis Falls. The bridge replacement will occur downstream from the current bridge to maintain visitor access during construction and provide better parking and visitor use.
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Start Date: 2022 End Date: 2022 Cost: $21 million Fund Source(s): Emergency Relief for Federally Owned Roads Location: North Entrance Road between Mammoth Hot Springs and the North Entrance in Gardiner, Montana Project Description: 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. The effort to design and construct this road on an accelerated timeline was a direct result of the partnerships between NPS, FHWA Western Federal Lands Highway Division, RockSol Consulting Group, and HK Contractors. The North Entrance Road opened to public travel on Oct. 30, 2022. The NPS is working closely with FHWA to evaluate a range of permanent road alignment alternatives and identify the most cost effective, resilient, and least environmentally impacting option.
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Start Date: 2022 End Date: 2023 Cost: $25 million Fund Source(s): Emergency Relief for Federally Owned Roads Locations: Sections of Northeast Entrance Road between Lamar River Canyon and Warm Creek Project Description: High water during the 2022 flood event destroyed the Northeast Entrance Road in three places and threatened lane collapse in two additional places. Jacobs Engineering Group worked on design while Oftedal teams completed repairs. The team of FHWA, Jacobs Engineering Group, Oftedal Construction, and the NPS achieved an accelerated reopening date, and the road opened to public travel on Oct. 15, 2022. Yellowstone worked closely with the team members as additional efforts continued in the spring of 2023 to finalize road sections in Lamar River Canyon and near the Trout Lake Trailhead, and mile marker 27.4.
Before and After:
Start Date: 2022 End Date: 2023 Cost: $50 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Grand Loop Road between Biscuit Basin and Grant Village Project Description: This project rehabilitated 22 miles of the Grand Loop Road between Old Faithful and West Thumb to preserve access to the most heavily traveled corridor of Yellowstone. Work included repaving the full 30-foot-wide roadway segment, sub-excavating to replace the entire road structure where frost heaving has caused considerable roadway damage, and repairing and replacing guardrails, culverts, and other drainage structures.
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Start Date: 2018 End Date: 2020 Cost: $42 million Fund Source(s): Federal Lands Transportation Program Location: East Entrance Road between Fishing Bridge and Indian Pond Project Description: This 3.5-mile-long project modernized the road to a 30-foot width and added turn lanes, parking improvements, and pullouts. The Fishing Bridge received a new deck and protection for the wooden piers from ice damage in 2019. A 1,500-foot viaduct replaced the 1902 earthen causeway over Pelican Creek to allow the estuary to flow unimpeded. Revegetation staff seeded approximately 60% of the project and planted several hundred nursery-grown plans in sensitive areas.
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Start Date: 2020 End Date: 2021 Cost: $28 million Fund Source(s): National Significant Federal Lands and Tribal Projects Location: Grand Loop Road between Tower-Roosevelt and Chittenden Road Project Description: This segment of road between Tower-Roosevelt and Chittenden Road remained largely unchanged since the last improvements in the 1930's. The project reconstructed the 6.1-mile road and added pullouts and parking areas, improved the Buffalo Paddock picnic area, more than doubled the capacity of the Tower Falls Store parking area, reconditioned the 1.4-mile Chittenden Road, and reconstructed the Mount Washburn parking lot.
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Utility Systems
Start Date: 2018 End Date: 2021 Cost: $3 million Fund Source(s): Repair/Rehabilitation Location: Canyon Village Project Description: This project replaced three lagoon liners at the Canyon Wastewater Treatment Plant. The liners from all three ponds were 25 years old and showed substantial degradation. The sludge-holding pond contained a substantial buildup of sludge, which significantly curtailed the usable storage volume of the pond and led to multiple overflows.
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Start Date: 2023 End Date: 2023 Cost: $4 million Fund Source(s): Repair/Rehabilitation Location: Madison Junction Project Description: A water test showed the possibility of surface water influence. The Environmental Protection Agency issued a letter changing the water system’s designation. As a result, the project replaced the spring-fed water system.
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Start Date (estimated): 2025 End Date (estimated): 2025 Cost (estimated): $2.8 million Fund Source(s) (tentative): Great American Outdoors Act Legacy Restoration Fund Location: Old Faithful Project Description: With failing concrete structures, catwalks, and other abandoned equipment, the site was a safety hazard for employees and residents, as well as an eyesore in the Old Faithful government area. All of the structures were removed and the area rehabilitated.
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Facilities and Developed Areas
Start Date: 2020 End Date: 2022 Cost: $6 million Fund Source(s): Cyclic Maintenance Program, Line Item Construction, Repair/Rehabilitation Location: Bechler Project Description: This project replaced an outdated ranger station and employee housing, rehabilitated the road, constructed a new parking area, and installed new utilities and a solar panel array in partnership with NorthWestern Energy.
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Start Date: 2020 End Date: 2023 Cost: $39 million Fund Source(s): Line Item Construction, Repair/Rehabilitation Locations: Bechler, Lake Village, Mammoth Hot Springs, Old Faithful, and West Entrance in West Yellowstone, Montana Project Description: This project replaced 65 obsolete trailers with new modular homes. The trailers located throughout the park were 40-60 years old and in substandard condition. The project upgraded utilities and incorporated landscape designs to develop a sense of community. Using modular versus on-site construction has saved the park an estimated $36 million and six years from the original housing improvement plan proposal.
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Start Date: 2022 End Date: 2022 Cost: $13.8 million Fund Source(s): Cyclic Maintenance Program, Repair/Rehabilitation Locations: Parkwide Project Description: This project renovated the interiors (and limited exteriors) of 150 non-historic housing units across the park at an average of $92,000 per unit. Improvements included replacing wood stoves, appliances, cabinets, flooring, plumbing fixtures, windows, roofing, and siding.
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Start Date: 2020 End Date: 2021 Cost: $1 million Fund Source(s): Cyclic Maintenance Program, Repair/Rehabilitation Location: Mammoth Hot Springs Project Description: This project painted the building’s exterior, added entry portico roofs, performed seismic retrofits, and replaced outdated electrical, mechanical, plumbing, fire alarm, fire suppression, environmental control, and security systems .The exterior repairs will prevent water intrusion, increase energy efficiency, and enhance security.
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Start Date: 2020 End Date: 2021 Cost: $12 million Fund Source(s): Federal Lands Transportation Program, Philanthropic Donations Location: North Entrance in Gardiner, Montana Project Description: This project addressed increased visitation by expanding visitor entrance capacity and updating the entrance stations. The project included three new entrance kiosk buildings, improving approximately 2 miles of roadway, provided an additional queuing lane for visitors entering the park, updated utilities, and improved parking for concession operations.
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Start Date: 2021 End Date: 2021 Cost: $80,000 Fund Source(s): Cyclic Maintenance Program, Repair/Rehabilitation Location: Peale Island in southern area of Yellowstone Lake Project Description: This project designed and installed a crib wall on the eroding north shore of Peale Island. Over 42 tons of building material was flown to the island and used in the construction of the wall. The park saved an estimated $140,000 from its original proposal to relocate the cabin.
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Ongoing Projects
Roads and Bridges
Start Date: 2025 End Date (estimated): 2026 Cost (estimated): $2.7 million Fund Source(s): Cyclic Maintenance Program, Federal Lands Transportation Program Location: Bridge Bay Project Description: This project includes repairing erosion and undermining at the north abutment, sealing cracks, and replacing unsound concrete on the deck, sidewalks, and wingwalls. Expansion joints will be cleaned and resealed, bearings reset, and structural steel repainted. The deck surface will be milled and overlaid, and approach pavement repaved. Safety upgrades include installing or updating guardrails, transitions, and terminal ends. Railing and bearings will also be repaired as needed.
Current Condition:
Start Date: 2025 End Date (estimated): 2025 Cost (estimated): $1.5 million Fund Source(s): Cyclic Maintenance Program, Federal Lands Transportation Program Location: Grand Loop Road south of Old Faithful developed area Project Description: The project includes cleaning and resealing expansion joints, milling and overlaying the deck surface, and removing unsound concrete from sidewalks and abutment backwalls. Additional riprap and scour protection will be placed along the channel banks and west abutment slope. Steel railings will be cleaned and painted, and approach pavement will be milled, repaved, and striped. Other work includes sealing concrete surfaces, clearing debris, installing object markers, and repairing a utility on the north sidewalk.
Current Condition:
Start Date: 2026 End Date (estimated): 2026 Cost (estimated): $1.2 million Fund Source(s): Cyclic Maintenance Program, Federal Lands Transportation Program Location: Midway Geyser Basin between Madison Junction and Old Faithful Project Description: This project includes replacing the deck and select deteriorated stringers, cleaning and painting structural steel, and repairing scour and undermining at the north abutment. Shims will be installed at exterior stringers for better support. Stone masonry retaining walls at the north approach will be repaired, and missing stones on the west side of the south approach will be replaced. Additionally, rock-lined drainage structures will be installed to redirect water away from the roadway.
Current Condition:
Start Date: 2026 End Date (estimated): 2027 Cost (estimated): $23 million Fund Source(s): Bipartisan Infrastructure Law Location: Grand Loop Road between Mammoth Hot Springs and Tower Junction Project Description: To extend the service life of this 1939 steel truss bridge, the project includes replacing expansion joints; deep-patch repairs to the approach spans; repairs to the steel truss, concrete elements, railings, and catwalk; repainting the bridge; and adding concrete guard walls.
Current Condition:
Start Date: 2025 End Date (estimated): 2026 Cost (estimated): $200,000 Fund Source(s): Cyclic Maintenance Program, Federal Lands Transportation Program Location: Grand Loop Road near Madison Junction Project Description: This project includes realigning and reattaching sections of the west-side railing and new connection bolts, as well as cleaning and painting the entire railing system. These bridge preservation efforts help prevent premature deterioration and extend the bridge’s service life. Reattaching the railing also enhances safety by preventing vehicles from accidentally leaving the roadway or bridge.
Current Condition:
Start Date: 2025 End Date (estimated): 2026 Cost (estimated): $420,000 Fund Source(s): Cyclic Maintenance Program, Federal Lands Transportation Program Location: Old Faithful Project Description: This project includes installing a new drainage structure on the southwest side of the overpass and improving or replacing the existing drainage system on the southeast side. The current drainage is ineffective, causing severe erosion along the adjacent slopes. Upgrading these systems will better manage water flow, protect the interchange, and prevent further erosion.
Current Condition:
Start Date: 2022 End Date (estimated): 2026 Cost (estimated): $134 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Northeast Entrance Road near Tower Junction Project Description: This project is replacing the 1963 Yellowstone River Bridge near Tower Junction as well as relocating the junction and modernizing 3.5 miles of roadway, pullouts, and ancillary facilities. Over a dozen options were considered, and park management chose to build the new bridge upstream of the existing bridge on a brand-new alignment. The existing bridge is approximately 604 feet long and 70 feet high. The new bridge will be 1,175 feet long and 162 feet high. Other project highlights include construction of the new Yellowstone River Overlook Trailhead Parking Area and expansion of the Yellowstone River Picnic Area.
Current Condition:
Construction Progress:
Utility Systems
Start Date: 2026 End Date (estimated): 2028 Cost (estimated): $129 million Fund Source(s): Disaster Relief Supplemental Location: Canyon Village Project Description: This project will address deficiencies that have become worse due to the 2022 flood event. Work includes the construction of a headworks, a secondary treatment system, a solids treatment train, operation and maintenance facilities, testing laboratory, an upgrade of the supervisory control and data acquisition system, the installation of an intra-plant pump station, installation of backup power generators, and related system components.
Current Condition:
Start Date: 2026 End Date (estimated): 2028 Cost (estimated): $110 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Canyon Village Project Description: The project will include the replacement of headworks, process tanks, sludge handling, and advanced wastewater treatment processes; rehabilitation or replacement of wastewater collection systems; replacement of pumps, motors, blowers, tanks, piping, controls, and buildings that house treatment processes; improvement to lift stations and controls; replacement of back-up generators and lift station enclosures; and installation of collection and treatment process telemetry.
Grant Wastewater Plant
Current Condition:
Canyon Wastewater Collection System
Current Condition:
Start Date: 2025 End Date (estimated): 2029 Cost (estimated): $2 million Fund Source(s): Repair/Rehabilitation Location: Lamar Buffalo Ranch Project Description: This project will improve the efficiency and capacity of the Lamar Buffalo Ranch renewable energy system. The location is off-grid and needs a more reliable source of renewable energy. The current solar panels and outdated battery bank have been replaced. The 5-kwh micro-hydro system will be rehabilitated starting in 2027.
Current Condition:
Start Date: 2026 End Date (estimated): 2027 Cost (estimated): $8.4 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Mammoth Hot Springs Project Description: This project will rehabilitate the deteriorated sewer system that collects and conveys wastewater from Mammoth Hot Springs to the wastewater treatment plant in Gardiner, Montana. Repairs will reduce groundwater infiltration, reduce arsenic levels in the sludge, and limit sewer line deterioration.
Current Condition:
Start Date: 2022 End Date (estimated): 2026 Cost (estimated): $46 million Fund Source(s): Disaster Relief Supplemental, Line Item Construction Location: Mammoth Hot Springs Project Description: The sewer line adjacent to the road that carried wastewater from Mammoth Hot Springs to a sewage treatment plant in Gardiner, Montana, was destroyed in the 2022 flood event. Staff quickly rerouted the wastewater into percolation ponds used between the 1930's and 1960's, allowing for summer day-use visitors and some residents to stay in the area. A temporary wastewater treatment system was then constructed to serve the Mammoth area and continues to be upgraded while a permanent solution is developed.
Current Condition:
Construction Progress:
Start Date: 2026 End Date (estimated): 2027 Cost (estimated): $253,000 Fund Source(s): Repair/Rehabilitation Location: Old Faithful Project Description: The water main serving the Old Faithful Visitor Center, Old Faithful Inn, and Old Faithful Lodge and Cabins, which is believed to be lead or lead-lined steel, will be replaced. Completion of this project will eliminate the only pipe in the park strongly suspected to contain lead, reducing health risks to park staff and visitors in the Old Faithful area.
Start Date: 2026 End Date (estimated): 2028 Cost (estimated): $50 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Old Faithful Project Description: This project will construct a new addition to the existing treatment building to house an arsenic removal system, which will include chemical storage tanks, chemical feed pumps, mixers, valves, piping, instrumentation, controls, and settling basins.
Current Condition:
Start Date: 2022 End Date (estimated): 2027 Cost (estimated): $3 million Fund Source(s): Repair/Rehabilitation Location: Tower Junction Project Description: This project will rehabilitate the existing pumphouse by replacing 430 feet of pipeline and two pumps, adding filtration and telemetry systems, replacing the existing septic tank and perforated piping, and increasing water storage capacity.
Current Condition:
Facilities and Developed Areas
Start Date: 2022 End Date (estimated): 2030 Cost (estimated): $59 million Fund Source(s): Cyclic Maintenance Program, Repair/Rehabilitation Locations: Parkwide Project Description: After successfully completing the interior renovations of 150 non-historic units, the park set a new challenge goal to renovate all remaining units, both interior and exterior. Project planning is underway for exterior upgrades, including lead paint mitigation, new siding, improved insulation, energy-efficient windows and doors, and roof replacements. The park has spent $6.2 million to date, and an additional federal investment of $50 million is needed over the coming years to achieve this goal.
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Start Date: 2025 End Date (estimated): 2027 Cost (estimated): $25 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Mammoth Hot Springs Project Description: This project will stabilize and rehabilitate the exteriors of six buildings located within the Historic Fort Yellowstone and one building located in Lower Mammoth. The buildings are currently used for employee housing. The project will include rehabilitation of the building envelopes, structural repairs, roof repairs, window and door rehabilitation, painting, and hazardous material mitigation.
Current Condition:
Construction Progress:
Start Date (estimated): 2025 End Date (estimated): 2027 Cost (estimated): $24 million Fund Source(s): Great American Outdoors Act Legacy Restoration Fund Location: Old Faithful Project Description: This project will preserve and stabilize the Historic Laurel Dormitory and repurpose the building from concession dormitory to NPS employee housing. This structure is part of the Old Faithful Historic District, designed in 1922 by Robert Reamer, who designed the famous Old Faithful Inn. The project will rehabilitate the building envelope, including structural repairs, seismic stabilization, new roof, window repair, life safety improvements, and hazardous material mitigation. Interior redesign will provide approximately 20 safe and efficient employee apartments with updated mechanical and electrical systems.
Current Condition:
Construction Progress:
Start Date: 2025 End Date (estimated): 2029 Cost (estimated): $63 million Fund Source(s): Philanthropic Donations, Disaster Relief Supplemental Locations: Parkwide Project Description: In March 2024, Yellowstone National Park secured a $50 million private donation to build new modular employee housing in multiple locations across the park. The donation will allow for 70 new employee housing units, garages, and associated infrastructure.
Construction Progress:
Start Date: 2023 End Date (estimated): 2030 Cost (estimated): $6 million Fund Source(s): Repair/Rehabilitation Location: Mammoth Hot Springs Project Description: The Historic Fort Yellowstone District has seven centralized boiler systems that provide heating to most of the district’s buildings. These systems are over 40 years old, are unreliable and inefficient, and have several leaks. This project will decentralize the systems by installing high-efficiency boilers into each unit.
Start Date (estimated): 2026 End Date (estimated): 2027 Cost (estimated): $4 million Fund Source(s): Repair/Rehabilitation Location: Mammoth Hot Springs Project Description: In conjunction with the Lead-Contaminated Historic Fort Yellowstone Rehabilitation, Phase 1 project, the lead-contaminated soil will be removed and replaced. The soils in the Fort Yellowstone Historic District tested well over the acceptable limit requiring immediate corrective action. Removal and replacement of contaminated soil reduces long-term health and safety risks, limits future liability associated with hazardous material exposure, and restores safe residential use of the affected housing areas.
Start Date (estimated): 2024 End Date (estimated): 2028 Cost (estimated): $3.5 million Fund Source(s): Cyclic Maintenance Program, Repair/Rehabilitation Location: Parkwide Project Description: Lead contamination in housing poses significant health risks to residents and is a serious concern for employee accommodations. Addressing lead hazards, including lead paint mitigation and contaminated soil removal, is an essential part of Yellowstone National Park’s ongoing renovation efforts. These measures aim to create safer living environments by eliminating exposure to harmful substances and ensuring compliance with safety standards. The park has committed substantial funding and has established specific projects to reduce lead-related risks in both historic and non-historic housing units, reflecting its dedication to the well-being of its employees.
Approved Projects
Roads and Bridges
Start Date (estimated): 2027 End Date (estimated): 2027 Cost (estimated): $628,000 Fund Source(s) (tentative): Cyclic Maintenance Program, Federal Lands Transportation Program Location: South Entrance Road Project Description: This bridge preservation project includes replacing curbs, resetting bridge railing posts, milling and repaving the roadway approaches, and cleaning and sealing the bridge deck. Additional repairs include sealing cracks in the beams, deck underside, and abutments, replacing deteriorated concrete on the abutment backwalls, and cleaning and repainting the bridge railing. Together, these improvements will extend the bridge's service life while enhancing safety and structural integrity.
Current Condition:
Start Date (estimated): 2027 End Date (estimated): 2027 Cost (estimated): $1.1 million Fund Source(s) (tentative): Cyclic Maintenance Program, Federal Lands Transportation Program Location: Grand Loop Road between Mammoth Hot Springs and Tower Junction Project Description: The project includes cleaning and resealing expansion joints, milling and overlaying the deck surface, and removing unsound concrete from sidewalks and abutment backwalls. Additional riprap and scour protection will be placed along the channel banks and west abutment slope. Steel railings will be cleaned and painted, and approach pavement will be milled, repaved, and striped. Other work includes sealing concrete surfaces, clearing debris, installing object markers, and repairing a utility on the north sidewalk.
Current Condition:
Start Date (estimated): 2028 End Date (estimated): 2030 Cost (estimated): $42 million Fund Source(s) (tentative): Federal Lands Transportation Program (additional funding is TBD) Location: West Entrance Road Project Description: This project will replace a structurally deficient bridge along the West Entrance Road. The bridge replacement will occur downstream from the current bridge to maintain visitor, employee, and support access to the park’s busiest road during construction.
Current Condition:
Start Date (estimated): 2027 End Date (estimated): 2029 Cost (estimated): $43 million Fund Source(s): National Significant Federal Lands and Tribal Projects, Federal Lands Transportation Program (additional funding is TBD) Location: Grand Loop Road between Mammoth Hot Springs and Swan Lake Flat Project Description: The third phase of the project will reconstruct the roadway, parking areas, slopes, and drainage systems. The project will also construct a new Bunsen Peak parking area, an accessible walkway and bridge connecting the parking area to the Rustic Falls overlook and reconstruct the historic stone masonry guard wall through Golden Gate Canyon.
Current Condition:
Start Date (estimated): 2027 End Date (estimated): 2030 Cost (estimated): $313 million Fund Source(s) (tentative): Disaster Relief Supplemental Location: North Entrance Road between Mammoth Hot Springs and North Entrance in Gardiner, Montana Project Description: Currently, there are three alternatives for the New North Entrance Road:
The canyon alignment would follow the original road and be rebuilt in Gardner Canyon.
The OGR alignment would improve upon the North Entrance Road Emergency Improvements project.
The center alignment would connect sections of the old and new road alignments with a road segment outside Gardner Canyon. This project would occur in tandem with the Mammoth Wastewater Main Replacement project.
Current Condition:
Start Date (estimated): 2029 End Date (estimated): 2032 Cost (estimated): $268 million Fund Source(s) (tentative): Disaster Relief Supplemental Location: Northeast Entrance Road between Tower Junction and Northeast Entrance in Silver Gate/Cooke City, Montana Project Description: This road segment between Tower-Roosevelt and the Northeast Entrance remains largely unchanged since its construction in the 1930's. This 11-mile-long project will reconstruct the road base, widen to 30 feet, add additional pullouts and scenic viewpoints, and realign roads impacted by the 2022 flood event. The Pebble Creek Campground will be rehabilitated, and six bridges along Soda Butte Creek will be replaced. The Northeast Entrance Station will also be improved for oversized vehicles.
Pebble Creek Campground
Current Condition:
Start Date (estimated): 2026 End Date (estimated): 2026 Cost (estimated): $1 million Fund Source(s) (tentative): Cyclic Maintenance Program, Federal Lands Transportation Program Location: South Entrance Road Project Description: This project will replace bridge curbs, reset bridge railing posts, and mill and repave the bridge approaches. It will repair erosion trenches and the south abutment footing with scour protection. The bridge deck and curbs will be cleaned, sealed, and cleared of debris, while deteriorated concrete on the south abutment backwall and bearing seat will be replaced. Cracks in the beams, deck underside, and abutment will be sealed, and the bridge railing will be cleaned and repainted with new object markers installed.
Current Condition:
Utility Systems
Start Date (estimated): 2026 End Date (estimated): 2030 Cost (estimated): $1.3 million Fund Source(s) (tentative): Repair/Rehabilitation Location: Parkwide Project Description: The park maintains 490 fire hydrants and as of December 2023, 75% of the fire hydrants have failed official inspections. Fire hydrants are in varying stages of disrepair due to age, failing infrastructure, manufacturer obsolescence, and an inability to meet National Fire Protection Association standards for pressure. Phase 1 will replace 30 fire hydrants in Mammoth Hot Springs.
Start Date (estimated): 2027 End Date (estimated): 2028 Cost (estimated): $6 million Fund Source(s) (tentative): Repair/Rehabilitation Location: Lake Village Project Description: This project will rehabilitate the water treatment system, including replacing the pumphouse and spring boxes, as well as upgrading the treatment processes to meet EPA standards and accommodate for the expanded year-round housing area.
Start Date (estimated): 2027 End Date (estimated): 2030 Cost (estimated): $10 million Fund Source(s) (tentative): Disaster Relief Supplemental Location: Mammoth Hot Springs Project Description: This project will rehabilitate the 5.1-mile sewer main that collects and conveys wastewater from Mammoth Hot Springs, Wyoming, to the wastewater treatment plant in Gardiner, Montana. Significant sections of the main were destroyed in the 2022 flood event. This project will occur in tandem with the North Entrance Road Replacement project.
Current Condition:
Start Date (estimated): 2026 End Date (estimated): 2029 Cost (estimated): $34 million Fund Source(s) (tentative): Great American Outdoors Act Legacy Restoration Fund Location: Old Faithful Project Description: This project will rehabilitate the wastewater treatment plant, two sewer lift stations, deteriorated sewer collection and lateral lines, and manholes. It will also upgrade the telemetry and supervisory control and data acquisition (SCADA) systems. Lastly, it will replace deteriorated electrical and mechanical components, including all pumps and controls, and upgrade the septage receiving system to a larger capacity system.
Current Condition:
Start Date (estimated): 2027 End Date (estimated): 2028 Cost (estimated): $6 million Fund Source(s) (tentative): Repair/Rehabilitation Location: Old Faithful Project Description: The current finished water line for Old Faithful, installed in the 1970’s, is made from Techite, a brand-named fiberglass-wound pipe that has been found to be susceptible to catastrophic failure resulting from internal deterioration. This project will replace the 4,100-foot line, ensuring reliable potable water for the Old Faithful area.
Start Date (estimated): 2027 End Date (estimated): 2028 Cost (estimated): $6 million Fund Source(s) (tentative): Repair/Rehabilitation Location: Old Faithful Project Description: The current raw water line for Old Faithful was also installed in the 1970’s and is made from Techite, a brand-named fiberglass-wound pipe that has been found to be susceptible to catastrophic failure resulting from internal deterioration. This project will replace the 4,900-foot line, ensuring reliable potable water for the Old Faithful area.
Facilities and Developed Areas
Start Date (estimated): 2026 End Date (estimated): TBD Cost (estimated): $2.5 million Fund Source(s) (tentative): Disaster Relief Supplemental Location: Northeast Entrance Road Project Description: This project will replace and relocate 11 campsites and a portion of the Pebble Creek Campground road lost in the 2022 flood, relocate campground access road out of the floodplain, replace infrastructure (e.g., wells and hand pumps, vault toilets) lost in the flood, and upgrade some sites to include ABA facilities. All work completed at Slough Creek.
2022 Flooding in
Pebble Creek Campground:
Start Date (estimated): 2026 End Date (estimated): TBD Cost (estimated): $2 million Fund Source(s) (tentative): Disaster Relief Supplemental Location: Parkwide Project Description: This project will replace Rescue Creek and Lava Creek Trail bridges and the Lower Blacktail Cabin, which were lost during the 2022 flood. Additionally, repairs to flood-damaged trails will continue parkwide.
Lower Blacktail Cabin
Before 2022 Flood:
Start Date (estimated): 2027 End Date (estimated): 2027 Cost (estimated): $1.5 million Fund Source(s) (tentative): Repair/Rehabilitation Location: Mammoth Hot Springs Project Description: Originally constructed as cavalry barracks in 1891, the Yellowstone Center for Resources is a historic structure significantly contributing to the Fort Yellowstone National Historic District. The current roof structure is in poor condition with several roof leaks and entry points for pests. Replacing the roof will not only address the leaks but allow improved design, including installation of ice and water shield and reconfiguration of the drip edges.
