FILE IMAGE - General views of runoff from Pinwheel Geyser in the Norris Geyser Basin at Yellowstone National Park on May 27, 2021, in Yellowstone National Park, Wyoming. (Photo by AaronP/Bauer-Griffin/GC Images) "Boardwalks in geyser basins protect visitors and delicate thermal formations," Yellowstone National Park Public Affairs Officer Morgan Warthin said in a statement.