Last Known Eruption
10h 23m ago

Latest Eruptions

Eruption DurationInterval
27 Sep 2023 @ 111919h 9m
26 Sep 2023 @ 161012m
26 Sep 2023 @ 15586h 23m
26 Sep 2023 @ 093514h 43m
25 Sep 2023 @ 18528h 21m
25 Sep 2023 @ 103120m
25 Sep 2023 @ 101118m
25 Sep 2023 @ 095316m
25 Sep 2023 @ 0937 ie2d 26m
23 Sep 2023 @ 091113m
23 Sep 2023 @ 08582d 20h 6m
20 Sep 2023 @ 125218m
20 Sep 2023 @ 123428m
20 Sep 2023 @ 120618h 14m
19 Sep 2023 @ 17524d 2h 59m
15 Sep 2023 @ 1453 wc≥8m4d 20h 48m
10 Sep 2023 @ 1805 ie1d 21h 9m
08 Sep 2023 @ 205618m
08 Sep 2023 @ 20381d 1h 3m
07 Sep 2023 @ 1935 ie2d 8h 30m
05 Sep 2023 @ 1105 ie1d 20h 47m
03 Sep 2023 @ 1418 ie3h 29m
03 Sep 2023 @ 1049 ie1d 23h 37m
01 Sep 2023 @ 111219h 23m
31 Aug 2023 @ 154941m
31 Aug 2023 @ 150812m
31 Aug 2023 @ 1456 ie1d 18h 35m
29 Aug 2023 @ 2021 ie2h 19m
29 Aug 2023 @ 180219m
29 Aug 2023 @ 1743 ie6h 39m
29 Aug 2023 @ 11048m
29 Aug 2023 @ 10561d 19h 59m
27 Aug 2023 @ 14572h 34m
27 Aug 2023 @ 1223 ie1d 16h 28m
25 Aug 2023 @ 1955 ie wc10d 4h 55m
15 Aug 2023 @ 1500 ie2d 4h 46m
13 Aug 2023 @ 1014 ie1d 1m
12 Aug 2023 @ 1013 ie1d 18h 26m
10 Aug 2023 @ 15471-2m16m
10 Aug 2023 @ 1531~4m 4d 6h 10m
06 Aug 2023 @ 0921 ie wc14h 17m
05 Aug 2023 @ 1904~7m 17m
05 Aug 2023 @ 1847~7m 15m
05 Aug 2023 @ 1832~6m 20m
05 Aug 2023 @ 1812~9m 20m
05 Aug 2023 @ 1752~9m 9h 11m
05 Aug 2023 @ 0841 ie wc2h 13m
05 Aug 2023 @ 0628 ie wc5d 19h 26m
30 Jul 2023 @ 1102 wc21h 36m
29 Jul 2023 @ 1326 ie wc6d 3h 45m
23 Jul 2023 @ 0941 ie wc1d 15h 46m
21 Jul 2023 @ 1755 ie wc29m
21 Jul 2023 @ 172621m
21 Jul 2023 @ 1705 ie2d 9m
19 Jul 2023 @ 1656 ie wc1d 8h 20m
18 Jul 2023 @ 0836 wc5d 16h 25m
12 Jul 2023 @ 16115d 39m
07 Jul 2023 @ 153215d 20m
22 Jun 2023 @ 15123d 2h 34m
19 Jun 2023 @ 12382d 17h 40m
16 Jun 2023 @ 1858~2m 21m
16 Jun 2023 @ 1837~1m 11s 18m
16 Jun 2023 @ 1819~2m 18m
16 Jun 2023 @ 1801~2m 23h 24m
15 Jun 2023 @ 1837~3m 27m
15 Jun 2023 @ 18104.5m 24m
15 Jun 2023 @ 17462m 2d 40m
13 Jun 2023 @ 170634m
13 Jun 2023 @ 163236m
13 Jun 2023 @ 155630d 6h 19m
14 May 2023 @ 0937 wc13d 18h 24m
30 Apr 2023 @ 1513 wc2d 2h 27m
28 Apr 2023 @ 1246 wc3d 39m
25 Apr 2023 @ 120719h 8m
24 Apr 2023 @ 16592d 7h 10m
22 Apr 2023 @ 0949 wc27m
22 Apr 2023 @ 092216h 52m
21 Apr 2023 @ 163024m
21 Apr 2023 @ 160635m
21 Apr 2023 @ 1531172d 5h 51m
31 Oct 2022 @ 0940>2m 9m
31 Oct 2022 @ 09319d 19h 42m
21 Oct 2022 @ 134910m
21 Oct 2022 @ 133912d 22h 10m
08 Oct 2022 @ 15299m
08 Oct 2022 @ 15205h 52m
08 Oct 2022 @ 092816h 11m
07 Oct 2022 @ 17179m
07 Oct 2022 @ 170813m
07 Oct 2022 @ 165510m
07 Oct 2022 @ 16458m
07 Oct 2022 @ 16378m
07 Oct 2022 @ 16292h 3m
07 Oct 2022 @ 142620h 34m
06 Oct 2022 @ 17529m
06 Oct 2022 @ 174310m
06 Oct 2022 @ 17331d 6h 41m
05 Oct 2022 @ 105213m
05 Oct 2022 @ 103915m
05 Oct 2022 @ 10241d 20h 30m

Interval Statistics

Interval Count100
Min8m
Max172d 5h 51m
Mean3d 14h 8m
Median8h 46m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
27424 05 Aug 2023 @ 1752 05 Aug 2023 @ 1911 JSJ Closed intervals: 20m, 20m, 15m, 17m. True intervals (= eruption end to next eruption start): 11m, 11m, 9m, 10m. Durations: ~9m, ~9m, ~6m, ~7m, ~7m.
25222 23 Apr 2023 @ 1409 23 Apr 2023 @ 1513 DanS No eruption this timeframe
20742 21 Jan 2022 @ 1438 --- aferrara Churning and thumping
17641 10 Jun 2021 @ 1600 10 Jun 2021 @ 1630 Graham No eruptions of Three Crater or Middle Sister seen during this time.
17194 26 May 2021 @ 1800 26 May 2021 @ 1902 JSJ All closed intervals. Fairly regular erupter. Most durations are a bit over a minute. Waves from splashing result in slight overflow of North Sister Spring's basin.
16112 13 Sep 2020 @ 1642 --- Art Pool calm
13806 26 Sep 2019 @ 1548 26 Sep 2019 @ 1646 DanS No eruptions. Domed water at 1616. Windy.
13028 04 Aug 2019 @ 1029 04 Aug 2019 @ 1626 JSJ All closed intervals. Have never before seen this geyser be so regular in intervals and durations. All were ~1 to 2 minutes long. Usual spaced splashing.
12367 30 Dec 1993 @ 0000 30 Dec 1993 @ 2359 JarnoO I's 7-9m; d 1-3m; height 3'
EntrySourceLinkComment
25 Jul 2020 @ 0714 JarnoO https://www.youtube.com/watch?v=ozICoRgkku8 Fragment of this eruption as seen from the webcam, by JoeN.
25 Apr 2020 @ 0700 JoeN https://youtu.be/5b0T-qkV6Rk 3c video
13 Mar 2020 @ 1253 ltgangi https://youtu.be/TDtoD3iQC-Y Three crater
04 Aug 2016 @ 1853 JSJ https://www.youtube.com/watch?v=mNOUI3gd1Tk#t=3m57s Clip 6 of this video compilation (time stamp 3:57 to 6:12) shows Three Crater Geyser's 6:53 to 7:01 PM eruption on 4 August 2016. Remaining clips show 2 other eruptions that evening.
08 Jun 2016 @ 1919 JSJ https://www.youtube.com/watch?v=mNOUI3gd1Tk#t=1m01s Clips 3-5 of this video compilation (time stamp 1:01 to 3:56) show Three Crater Geyser's 7:19 to 7:25 PM eruption on 8 June 2016.
11 Jul 2014 @ 2036 JSJ https://www.youtube.com/watch?v=mNOUI3gd1Tk#t=0m40s Clip 2 of this video compilation (time stamp 0:40 to 1:00) shows Three Crater Geyser's 8:36 to 8:44 PM eruption on 11 July 2014.
08 Jul 2014 @ 1742 JSJ https://www.youtube.com/watch?v=mNOUI3gd1Tk Clip 1 of this video compilation (beginning to time stamp 0:39) shows Three Crater Geyser's 5:42 to 5:44 PM eruption on 8 July 2014.
08 Jul 2014 @ 1804 JSJ https://www.flickr.com/photos/jsjgeology/15292798176 Photo (1 of 3) of Three Crater Geyser's 6:04 PM-onward eruption on 8 July 2014.
Baseline does not exist.