• A bull elk bugles in Yellowstone National Park

    Yellowstone

    National Park ID,MT,WY

There are park alerts in effect.
hide Alerts »
  • Craig Pass Closed for the Season; Mammoth to Norris, Expect 30-minute Delays

    The road linking West Thumb and Old Faithful is closed for the season—traffic should detour through West Thumb, Lake, and Canyon. More »

Echinus Geyser

Echinus Geyser's crater is billowing steam
 

Echinus (e-KI-nus) Geyser was a perennial crowd-pleaser which typically erupted every 35 to 75 minutes. Late in 1998, this geyser altered its interval and now erupts only a few times per day at best. Its pool fills gradually with water; then suddenly, bursts of steam and water explode 40 to 60 feet (12 to 18 m) skyward. Eruptions usually last about 4 minutes, but in the past major eruptions have lasted as long as 118 minutes. The major eruptions were believed to be caused by a secondary water source which has mysteriously vanished. There has not been a major eruption in 3 years. In late 1998 Echinus' performance diminished and became erratic. As of the summer of 2007, its eruptions continue to be far less predictable than they were in the 1990s.

Echinus is the largest acid-water geyser known. Its waters are almost as acidic as vinegar with a pH ranging from 3.3 to 3.6. Acid geysers are extremely rare with the majority of the planet's total being found here at Norris Geyser Basin.


< Previous Stop | Next Stop >

Did You Know?

Bison in Yellowstone.

There are more people hurt by bison than by bears each year in Yellowstone. Park regulations state that visitors must stay at least 25 yards away from bison or elk and 100 yards away from bears.