Due to important data center maintenance procedures on March 3rd, we will be experiencing several hours of downtime between the hours of 2:00 AM and 6:00 EST. Sorry for any inconvenience.

Mammoth Hot Springs and Norris Geyser Basin

Mammoth Hot Springs are largely inactive, but are very colorful, and the sheer size is impressive. Norris Geyser Basin is one of the most dynamic thermal areas in the park.