Geyser Watch

 An Online Field Journal at


Watching water go the other way…

as well as many more not-quite-so-exciting thermal features of Yellowstone.


GeyserWatch is moving here – lots of changes happening this spring!

Thanks for your patience as we shuffle things around. You can still head over to the old site:



Why is it called Black Pool when it’s blue?

One of the most often asked questions at West Thumb Geyser Basin is, "Why is it called Black Pool when it's blue?" This NPS photo from 1978 shows how it used to look, which is black. The microbes lining the surface of the crater were said to be a dark orange or brown...

Giant Geyser Awakening?

Geyser Gazers in Yellowstone yesterday had a great kick off to 2017 with a Hot Period from Giant Geyser.  They noticed Grotto Geyser was recovering from a "marathon" eruption - one that lasts a long time and drains the system enough to give Giant Geyser an opportunity...

Watching “N.O.T. Geyser” grow at West Thumb

This summer a new geyser broke out at West Thumb Geyser Basin just north of Thumb Geyser. People not familiar with geyser basins often assume that they're fairly static, and that after all these years, we know much about how thermal features work. The truth is that we...

An excellent video by Yellowstone National Park Service

Share This