Last Known Eruption
9d 17h 33m ago

Latest Eruptions

Eruption DurationInterval
10 Sep 2021 @ 15271d 20h 11m
08 Sep 2021 @ 1916 ie1d 3h 37m
07 Sep 2021 @ 1539 ie19h 39m
06 Sep 2021 @ 20001d 4m
05 Sep 2021 @ 1956 ie2d 4h 34m
03 Sep 2021 @ 152223h 46m
02 Sep 2021 @ 15363d 2h 17m
30 Aug 2021 @ 131914m
30 Aug 2021 @ 13051d 1h 23m
29 Aug 2021 @ 11426d 17h 22m
22 Aug 2021 @ 18205h 46m
22 Aug 2021 @ 123414m
22 Aug 2021 @ 122014d 23h 13m
07 Aug 2021 @ 1307 wc14m
07 Aug 2021 @ 125312m
07 Aug 2021 @ 124122d 23h 55m
15 Jul 2021 @ 1246 ie1d 1h 13m
14 Jul 2021 @ 1133 ie23h 11m
13 Jul 2021 @ 1222 ie9m
13 Jul 2021 @ 121328d 22h 51m
14 Jun 2021 @ 13228m
14 Jun 2021 @ 13147m
14 Jun 2021 @ 13077d 22h 40m
06 Jun 2021 @ 14278m
06 Jun 2021 @ 14199m
06 Jun 2021 @ 14108m
06 Jun 2021 @ 14028m
06 Jun 2021 @ 13549m
06 Jun 2021 @ 13458m
06 Jun 2021 @ 13372d 17h 59m
03 Jun 2021 @ 19382d 8h 8m
01 Jun 2021 @ 1130 ns1d 2h 30m
31 May 2021 @ 0900 ie12h 26m
30 May 2021 @ 20346m
30 May 2021 @ 20287m
30 May 2021 @ 20216m
30 May 2021 @ 20157m
30 May 2021 @ 20087m
30 May 2021 @ 20018m
30 May 2021 @ 19537m
30 May 2021 @ 19468m
30 May 2021 @ 19381d 8h 9m
29 May 2021 @ 11297m
29 May 2021 @ 11227m
29 May 2021 @ 11156m
29 May 2021 @ 11097m
29 May 2021 @ 11022d 16h 1m
26 May 2021 @ 19011m 23s 8m
26 May 2021 @ 1853~1.25m 8m
26 May 2021 @ 18451-1.25m7m
26 May 2021 @ 18380.75-1m7m
26 May 2021 @ 1831~0.25-0.5m8m
26 May 2021 @ 18231-1.25m7m
26 May 2021 @ 18161-1.25m8m
26 May 2021 @ 18088m
26 May 2021 @ 180012d 3h 56m
14 May 2021 @ 14047m
14 May 2021 @ 13579m
14 May 2021 @ 134851m
14 May 2021 @ 1257 ns wc7d 4h 13m
07 May 2021 @ 0844 ie wc6d 22h 26m
30 Apr 2021 @ 1018 ns wc2h 4m
30 Apr 2021 @ 0814 wc1d 25m
29 Apr 2021 @ 0749 wc17h 24m
28 Apr 2021 @ 14254h 35m
28 Apr 2021 @ 0950 wc16h 57m
27 Apr 2021 @ 16535h 15m
27 Apr 2021 @ 11389m
27 Apr 2021 @ 11291d 23h 24m
25 Apr 2021 @ 12051d 52m
24 Apr 2021 @ 111317h 37m
23 Apr 2021 @ 17365h 38m
23 Apr 2021 @ 1158 ie wc1h 1m
23 Apr 2021 @ 1057 wc5d 1h 22m
18 Apr 2021 @ 0935 ie3d 2h 0m
15 Apr 2021 @ 0735 wc71d 21h 8m
02 Feb 2021 @ 0927 ie wc7d 18h 6m
25 Jan 2021 @ 1521 ie wc5h 36m
25 Jan 2021 @ 0945 ie wc1d 22h 2m
23 Jan 2021 @ 1143 ie wc14m
23 Jan 2021 @ 1129 wc3h 56m
23 Jan 2021 @ 0733 ie wc7d 21h 21m
15 Jan 2021 @ 1012 wc1d 2h 20m
14 Jan 2021 @ 0752 ie wc68d 21h 3m
06 Nov 2020 @ 1049 ie wc3h 49m
06 Nov 2020 @ 0700 wc5d 19h 35m
31 Oct 2020 @ 1225 ie wc1h 58m
31 Oct 2020 @ 1027 wc12m
31 Oct 2020 @ 1015 ie wc59m
31 Oct 2020 @ 0916 wc20h 23m
30 Oct 2020 @ 1253 ie wc7d 1h 0m
23 Oct 2020 @ 1153 ie wc2d 4h 3m
21 Oct 2020 @ 0750 ie wc13h 38m
20 Oct 2020 @ 181219m
20 Oct 2020 @ 175310m
20 Oct 2020 @ 17436h 44m
20 Oct 2020 @ 1059 ie wc3d 3h 24m
17 Oct 2020 @ 0735 ie wc20h 14m
16 Oct 2020 @ 1121 ie wc1d 51m
15 Oct 2020 @ 10304d 22h 10m

Interval Statistics

Interval Count100
Min6m
Max71d 21h 8m
Mean3d 8h 25m
Median5h 37m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.