Last Known Eruption
5y 192d 19h 30m ago

Latest Eruptions

Eruption DurationInterval
18 Sep 2018 @ 1328 min15m
18 Sep 2018 @ 1313 min2h 6m
18 Sep 2018 @ 1107 min2d 6h 47m
16 Sep 2018 @ 0420 min11h 31m
15 Sep 2018 @ 1649 wc maj~35s 61y 245d 15h 49m
28 Jan 1957 @ 0000 A

Interval Statistics

Interval Count5
Min15m
Max61y 245d 15h 49m
Mean12y 122d 16h 53m
Median11h 31m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
33861 17 Jan 2024 @ 1602 --- K.Cooper quite calm. still boiling but less than I've seen recently
26082 06 Jun 2023 @ 1320 06 Jun 2023 @ 1325 aferrara pool-wide 6" boil, quitting by 1322, transitioning to sloshing against pool runs. 1323 boiling to a foot on left side of pool. Barely boiling at 1324.
26013 04 Jun 2023 @ 1215 --- Janet Jones Pulsing from Ear Spring followed by 6-8” boiling on the “left” side. Boiling died down briefly 5 min later and started again. When left sise increases, the right side dies down.
25882 29 May 2023 @ 0855 --- User34 Pool is pulsing and "clapping" into old runoff conduit in the back, much like Crystal does
25791 26 May 2023 @ 0615 --- Graham Still doing normal boils.
25784 25 May 2023 @ 1713 --- Graham Boiling has subsided to more closely resemble prior behavior.
25769 24 May 2023 @ 1858 --- Tara Still boiling constantly with occasional boils to 1 foot high. The bright orange bacteria that was in the channel next to the the boardwalk was mostly killed off except at the edges of the channels farther from the pool.
25737 24 May 2023 @ 0634 --- Graham Boiling a foot
19966 12 Oct 2021 @ 1608 --- Ben VL Kind of a large boil going on when I walked by. Left side of the pool to 5 or 6 inches. Died down after a bit.
19652 19 Sep 2021 @ 1414 --- Tara intermittent boiling on north end of pool
16495 31 Oct 2020 @ 1127 --- Janet Jones 1 ft boil from “front left” vent. D= 15-20 seconds.0
15741 26 Aug 2020 @ 1335 --- Janet Jones Ear Spring had a fresh runoff channel carved almost directly opposite of the spring on the boardwalk. Looked like it could have been from this morning. The other runoff channels looked like they have for some time.
14551 05 Jun 2020 @ 2001 --- William vigorous boil from 2 points along from rim of pool. hottest I have seen it this year.
14242 26 May 2020 @ 1116 --- Janet Jones Bubbling from the center of the pool in a line.
13908 09 Oct 2019 @ 1401 --- underarockphoto No snow within three feet. Small runoff rivulets behind it.
10729 05 Nov 2018 @ 1322 --- mhreed Two foot surge for ~20s.
10589 08 Oct 2018 @ 1113 --- Micah Kipple Surge to 2 feet
10518 01 Oct 2018 @ 1643 --- Micah Kipple 2' surge from the center of the pool.
10313 20 Sep 2018 @ 1821 --- Betty Large boil for about 15 seconds as seen from the barrier at Arrowhead Spring
10283 18 Sep 2018 @ 0945 --- Micah Kipple Frequent surging minor eruptions 2-3' high from left front vent. Righthand vent in constant state of superheated boiling from flat to 2'
10252 16 Sep 2018 @ 0734 --- steve One piece of the sinter rim about 4X8 inches washed off during a strong boil.
10250 16 Sep 2018 @ 0719 --- steve Two peices of the sinter rim on the north edge are loose and may wash away.
10242 16 Sep 2018 @ 0637 --- steve No major eruption overnight. Still heavy bioling, occasionly to 2-3 feet. Overall the whole area on the west side of the hill looks like it did last night
10231 15 Sep 2018 @ 2156 --- Micah Kipple Cycling rapidly from 1-2 inches below ovf to sheeting heavy overflow accompanied by violent superheated boiling from two vents. The lefthand vent can reach up to 4 feet.
9499 06 Aug 2018 @ 1842 --- Micah Kipple Gravel washed to the boardwalk. Fresh runoff channels.
8366 30 May 2018 @ 1157 --- Janet Jones Nearly all microbes have been killed in the runoff channels. They’ve also been greatly reduced in Pendant Spring.
4505 19 Jul 2017 @ 1238 --- Janet Jones Ear Spring is significantly hotter than it was on my last visit (think that was on 11 July 2017). There's also a seep that's active along the "front left" edge (as you face it on the boardwalk). I watched sustained boiling in the center of the pool that lasted 30 seconds or so.
3860 05 Nov 2016 @ 1117 --- Janet Jones Area between the section of Ear Spring that normally bubbles along the edge and the boardwalk was wet out to about a foot. This is not in the normal overflow channel for Ear.
3179 22 Jun 2016 @ 0935 --- David Spring boiling from lower right corner (vent area being upper right corner) as viewed from bw. see: https://www.flickr.com/photos/ujelang/27942211472/in/dateposted-public/
3371 11 Jun 2016 @ 1212 --- JSJ Thermal photography of pool recorded 190° F.
1124 04 Aug 2014 @ 0000 04 Aug 2014 @ 2359 mhreed Activity seemed slightly more vigorous than usual.
EntrySourceLinkComment
15 Sep 2018 @ 1649 DaveM https://www.youtube.com/watch?v=aLJlMCNmecs video of eruption as seen on webcam
Baseline does not exist.