Craig Pass Closed for the Season; Mammoth to Norris Closed Sept. 14-30
The road linking West Thumb and Old Faithful is closed for the season—traffic should detour through West Thumb, Lake, and Canyon. The road from Mammoth to Norris is closed for two weeks—traffic should detour over Dunraven Pass. More »
Blue Geyser was called Iris Spring in 1886. Due to a misread map label, in 1904 the feature was inadvertently given its current name. It was observed to erupt to heights of over 60 feet from 1993 to 1996. It became almost dormant in 1997 and has remained very quiet ever since. Blue Geyser's last observed eruption was in February of 1997.
Did You Know?
Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.