Last Known Eruption
6d 23h 36m ago

Latest Eruptions

Eruption DurationInterval
14 May 2024 @ 0739 wc2d 21h 50m
11 May 2024 @ 0949 ie wc3d 18h 24m
07 May 2024 @ 1525 wc11d 22h 15m
25 Apr 2024 @ 17102d 6h 52m
23 Apr 2024 @ 1018 ie wc1h 18m
23 Apr 2024 @ 0900 ie wc2d 23h 41m
20 Apr 2024 @ 0919 ie wc5d 1h 4m
15 Apr 2024 @ 0815 ie wc1d 23h 27m
13 Apr 2024 @ 0848 ie wc52m
13 Apr 2024 @ 0756 ie wc10d 19h 6m
02 Apr 2024 @ 1250 ie wc105d 12m
19 Dec 2023 @ 1138 ie wc2h 32m
19 Dec 2023 @ 0906 ie wc12d 18h 43m
06 Dec 2023 @ 1423 ie wc1d 5h 4m
05 Dec 2023 @ 0919 ie wc5d 21h 17m
29 Nov 2023 @ 1202 wc22h 14m
28 Nov 2023 @ 1348 ie wc11m
28 Nov 2023 @ 1337 ie wc26m
28 Nov 2023 @ 1311 wc1h 47m
28 Nov 2023 @ 1124 ie wc1d 2h 22m
27 Nov 2023 @ 0902 ie wc2d 1h 37m
25 Nov 2023 @ 0725 ie wc1d 23h 17m
23 Nov 2023 @ 0808 ie wc22h 14m
22 Nov 2023 @ 0954 ie wc14m
22 Nov 2023 @ 0940 ie wc38m
22 Nov 2023 @ 0902 ie wc30m
22 Nov 2023 @ 0832 ie wc22h 30m
21 Nov 2023 @ 1002 ie wc3d 2h 16m
18 Nov 2023 @ 0746 ie wc11m
18 Nov 2023 @ 0735 ie wc17d 20h 49m
31 Oct 2023 @ 1146 ie wc10d 21h 48m
20 Oct 2023 @ 13584h 32m
20 Oct 2023 @ 09264d 22h 57m
15 Oct 2023 @ 102921h 48m
14 Oct 2023 @ 12414d 23h 7m
09 Oct 2023 @ 1334 ie wc2d 3h 59m
07 Oct 2023 @ 0935 ie7d 17h 10m
29 Sep 2023 @ 16251d 5h 57m
28 Sep 2023 @ 102825m
28 Sep 2023 @ 100322h 44m
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

Interval Statistics

Interval Count100
Min8m
Max105d 12m
Mean3d 7h 48m
Median23h 22m

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.