Last Known Eruption
290d 11h 49m ago

Interval Statistics

Interval Count20
Min27m
Max6y 10d 9h 36m
Mean219d 9h 26m
Median11d 3h 50m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
8658 13 Jun 2018 @ 1400 --- CrisG Nice, wide 2.5-3 ft burst.
8064 03 May 2018 @ 1215 --- Micah Kipple Violent superheated boiling 30-60 cm with some surges to 1.3m
8012 27 Apr 2018 @ 0632 --- Micah Kipple Having nice bursts this morning
7999 25 Apr 2018 @ 1603 --- Micah Kipple Large sudden burst to 3 feet filling most of the pool
7988 22 Apr 2018 @ 1010 --- udo 3 to 4 foot bursts happen randomly. Smaller stuff is nearly constant.
7864 27 Dec 2017 @ 1242 --- novakg Nice 2 foot burst.
5671 03 Sep 2017 @ 1133 --- Pat Snyder 5 foot single burst, wide and surprising! Very cool.
3976 21 Apr 2017 @ 0806 --- Micah Kipple No evidence for recent major eruptions.
3845 04 Nov 2016 @ 1724 --- Betty nice tall burst for 1 second or 2, think about 3-4 ft.
3165 22 Jun 2016 @ 0824 --- David spouting 1-2'. see: https://www.flickr.com/photos/ujelang/27940051561/in/dateposted-public/
3331 22 Jun 2016 @ 0821 --- David observed from 8:21-8:30. In a state of near constant boiling, with max of 1+ ft. See photos: https://www.flickr.com/search/?user_id=93705139%40N00&sort=date-taken-desc&text=improbable%20geyser&view_all=1
3358 11 Jun 2016 @ 1000 11 Jun 2016 @ 1200 JSJ Thermal photography of Improbable Geyser in low perpetual spouting recorded 162° F.
2585 25 Oct 2015 @ 1034 --- Biddle possible eruption seen on webcam
2334 03 Sep 2015 @ 1858 --- bhoppe Huge splash/surge to 5ish feet
2167 19 Aug 2015 @ 0800 --- Micah Kipple Still slightly murky this morning. Teal blue water with a little more vigorous boiling than normal. No evidence of a followup eruption overnight.
2129 16 Aug 2015 @ 0800 16 Aug 2015 @ 0853 Micah Kipple Lots of strong boiling this morning. A couple "almost minors" to 4 feet, and at 0853 there was a botryoidal-like bubble to 2 feet that was spectacularly beautiful, if not startling.
1888 11 Jul 2015 @ 1530 11 Jul 2015 @ 1710 Micah Kipple Improbable had several large episodes of violent boiling over the west (new vent) that I observed during this time period. Some of the surges were 3 feet tall and just as wide and sent a small flood or runoff down it's channels.
1510 18 Jan 2015 @ 0730 --- Archer Snow marker placed in the late afternoon on the 17th was missing. Possible that the snow simply melted due to warm ground/warm air temperature, but ice chunks completely gone leading me to speculate that it may have had an event overnight. Pool color is completely back to normal.
1507 17 Jan 2015 @ 0740 --- WillBoekel snow marker still in place from last night. and the pool color is starting to clear
1185 08 Jul 2014 @ 0800 08 Jul 2014 @ 1800 JSJ Improbable Geyser in eruption during late morning & early afternoon on 8 July 2014 - doing its usual moderately low perpetual spouting.
1198 03 Jun 2014 @ 1200 --- JSJ Improbable Geyser was doing its usual, moderately-low perpetual spouting - observed around noon time on 3 June 2014.
2713 10 Aug 2013 @ 1444 --- JSJ Improbable Geyser was engaged in its usual, moderately low perpetual spouting behavior - observed in the middle & late afternoon of 10 August 2013.
Baseline does not exist.


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