The 2023 Mammoth Hot Springs Hotel opening has been delayed, as Yellowstone National Park officials work to complete a new wastewater treatment system in the area.
The hotel closed immediately after the 2022 historic June flood because of damage to the area’s wastewater system, with the plan to install a new wastewater treatment system in the area. A sewer line adjacent to the road that carried wastewater from Mammoth Hot Springs to a sewage treatment plant in Gardiner was ruptured. Staff quickly rerouted the wastewater into percolation ponds used between the 1930s and 1960s, allowing for summer day-use visitation and limited services.
Due to the heavy winter and difficult construction conditions, the new system will not be operational by April 28 as originally planned, the original 2023 Mammoth Hot Springs Hotel opening date. The park is working closely with contractors to complete the project as quickly as possible,
Although the hotel will be closed to overnight guests temporarily, the hotel’s gift shop, coffee and beverage service, and lobby will open as scheduled on April 28. Overnight accommodations will reopen immediately after construction of the wastewater system is completed. The hotel dining room and Terrace Grill will be temporarily closed and regularly scheduled tours departing from Mammoth Hotel will not be available.
All other services in Mammoth Hot Springs will be open including:
- Albright Visitor Center
- General Store
- Post Office
- Medical Clinic
- Gas Station
The opening of the Mammoth Campground will also be delayed until the wastewater system is operational. The campground closed immediately following the 2022 flood and remains closed because the campground lacks an outlet for wastewater.
Yellowstone National Park Lodges has been authorized to open other visitor accommodations earlier than normal to offset inconveniences to displaced guests with existing reservations for the Mammoth Hotel. Guests with reservations at the Mammoth Hotel will be offered opportunities to rebook at other Yellowstone National Park Lodges properties based on available space.
All other Yellowstone National Park Lodges properties will open as scheduled.