• Visitors stand on the boardwalk of Grand Prismatic, the park's largest hot spring which is ringed with orange, brown and yellow runoff channels.

    Yellowstone

    National Park ID,MT,WY

Black Growler Steam Vent

A photo of Black Growler Steam Vent
 

The hottest of Yellowstone's geothermal features are steam vents (fumaroles). Black Growler Steam Vent has measured 199 to 280 degrees F (93 to 138 degrees C). A plentiful water supply would help cool these features; however, steam vents are usually found on hillsides or higher ground, above the basin's water supply. They rapidly boil away what little water they contain, releasing steam and other gases forcefully from underground.

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Did You Know?

Summer Crowd at Old Faithful.

At peak summer levels, 3,500 employees work for Yellowstone National Park concessioners and about 800 work for the National Park Service.