Last Known Eruption
4d 12h 44m ago

Latest Eruptions

Eruption DurationInterval
22 Feb 2024 @ 17369d 7h 25m
13 Feb 2024 @ 1011120d 22h 50m
15 Oct 2023 @ 122113m 17d 1h 11m
28 Sep 2023 @ 11106d 19h 4m
21 Sep 2023 @ 160610m
21 Sep 2023 @ 155616m
21 Sep 2023 @ 15408m
21 Sep 2023 @ 153210m
21 Sep 2023 @ 152213m
21 Sep 2023 @ 15099m
21 Sep 2023 @ 150013m
21 Sep 2023 @ 14479m
21 Sep 2023 @ 143811m
21 Sep 2023 @ 14278m
21 Sep 2023 @ 141912m
21 Sep 2023 @ 14079m
21 Sep 2023 @ 135810m
21 Sep 2023 @ 1348 ini21h 50m
20 Sep 2023 @ 15585h 43m
20 Sep 2023 @ 101513d 19h 3m
06 Sep 2023 @ 15126h 43m
06 Sep 2023 @ 082914h 50m
05 Sep 2023 @ 173912d 5h 1m
24 Aug 2023 @ 12381m 4d 5h 19m
20 Aug 2023 @ 07197m 9m
20 Aug 2023 @ 07105m 15m
20 Aug 2023 @ 06553m 12h 40m
19 Aug 2023 @ 18152m 2h 5m
19 Aug 2023 @ 16103m 26m
19 Aug 2023 @ 154427m 14d 1h 28m
05 Aug 2023 @ 14165d 17h 18m
30 Jul 2023 @ 20585d 11h 8m
25 Jul 2023 @ 0950 ie9d 16h 47m
15 Jul 2023 @ 17032d 5h 19m
13 Jul 2023 @ 1144 ie16h 4m
12 Jul 2023 @ 19401d 6h 41m
11 Jul 2023 @ 12591d 16h 9m
09 Jul 2023 @ 205038m
09 Jul 2023 @ 2012~2m 3h 25m
09 Jul 2023 @ 164714m 10d 23h 48m
28 Jun 2023 @ 16598m 3m
28 Jun 2023 @ 16562m 39m
28 Jun 2023 @ 16173m 11m
28 Jun 2023 @ 16063m 8m
28 Jun 2023 @ 15583m 13m
28 Jun 2023 @ 15453m 9m
28 Jun 2023 @ 15363m 12m
28 Jun 2023 @ 15243m 9m
28 Jun 2023 @ 15153m 13m
28 Jun 2023 @ 15024m 9m
28 Jun 2023 @ 14534m 26m
28 Jun 2023 @ 14271m 11m
28 Jun 2023 @ 14163m 5h 21m
28 Jun 2023 @ 08553m 7d 22h 3m
20 Jun 2023 @ 1052 ie>20m 17h 54m
19 Jun 2023 @ 165815m
19 Jun 2023 @ 1643 ns11m
19 Jun 2023 @ 16323d 1h 41m
16 Jun 2023 @ 145119m
16 Jun 2023 @ 1432~3.5m 8m
16 Jun 2023 @ 142412m
16 Jun 2023 @ 1412 ns9m
16 Jun 2023 @ 1403~5m 20h 36m
15 Jun 2023 @ 17272m 7m
15 Jun 2023 @ 17201m 3m
15 Jun 2023 @ 17171m 8m
15 Jun 2023 @ 17095m 2h 57m
15 Jun 2023 @ 141238m
15 Jun 2023 @ 13342m 1h 23m
15 Jun 2023 @ 121148m
15 Jun 2023 @ 112316d 17h 24m
29 May 2023 @ 17591d 3h 57m
28 May 2023 @ 14026h 40m
28 May 2023 @ 07224d 12h 59m
23 May 2023 @ 18233h 44m
23 May 2023 @ 143943m
23 May 2023 @ 135632m
23 May 2023 @ 13242h 27m
23 May 2023 @ 10573d 15h 34m
19 May 2023 @ 19237h 51m
19 May 2023 @ 11328d 20h 44m
10 May 2023 @ 144817d 5h 12m
23 Apr 2023 @ 09362d 18h 40m
20 Apr 2023 @ 145653d 23h 0m
25 Feb 2023 @ 145643d 5h 38m
13 Jan 2023 @ 0918~1m 70d 20h 53m
03 Nov 2022 @ 1325 ie5d 22h 18m
28 Oct 2022 @ 1507 ie12d 22h 46m
15 Oct 2022 @ 162124d 23h 47m
20 Sep 2022 @ 16346h 7m
20 Sep 2022 @ 10274d 17h 48m
15 Sep 2022 @ 16394d 57m
11 Sep 2022 @ 1542~3m 5m
11 Sep 2022 @ 1537~2m 7m
11 Sep 2022 @ 1530~5m 10m
11 Sep 2022 @ 1520~5m 8m
11 Sep 2022 @ 1512~1m 7m
11 Sep 2022 @ 150510m
11 Sep 2022 @ 145511m
11 Sep 2022 @ 1444~4m 9m

Interval Statistics

Interval Count100
Min3m
Max120d 22h 50m
Mean5d 7h 0m
Median1h 5m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
27754 24 Aug 2023 @ 1239 24 Aug 2023 @ 1250 BrianR Sporadic bursting to 2ft
27700 20 Aug 2023 @ 0727 20 Aug 2023 @ 0738 BrianR Sporadic bursting to 2ft
27692 19 Aug 2023 @ 1655 19 Aug 2023 @ 1808 BrianR Sporadic bursting to 6ft, Grotto quiet all this time. Stopped when Grotto became noisy
27689 19 Aug 2023 @ 1614 19 Aug 2023 @ 1640 BrianR Sporadic bursting to 8ft
26983 10 Jul 2023 @ 1536 --- BrandonC Ending
26725 28 Jun 2023 @ 1709 28 Jun 2023 @ 1801 BrianR Sporadic bursting to 6ft
26713 28 Jun 2023 @ 0904 28 Jun 2023 @ 1002 BrianR Sporadic bursting to 4ft
26340 15 Jun 2023 @ 1242 --- Graham Bursting splashes. Also 1254
25587 20 May 2023 @ 1422 20 May 2023 @ 1445 Art Strong splashing and spikes but never truly started
23833 15 Sep 2022 @ 0810 15 Sep 2022 @ 0830 aferrara Bubblers around SGF splashing infrequently during high pressure poil
23728 11 Sep 2022 @ 1350 11 Sep 2022 @ 1520 OFVEC During this time there were 11 solo eruptions of South Grotto Fountain. Intervals were 7-14 minutes, reaching heights of 15' max. Grotto seemed ready to erupt throughout with pressure pool cycling every 10 minutes. Generally, SGF began eruptions following pressure pool drops and shut off before it rose. More info on this odd grotto incoming once my phone connects to the internet.
23767 11 Sep 2022 @ 1519 --- aferrara Light splashing in bubblers with high pressure pool
23392 24 Aug 2022 @ 1650 24 Aug 2022 @ 1732 BrianR Sporadic bursting to 6ft
23384 24 Aug 2022 @ 1017 24 Aug 2022 @ 1117 BrianR Sporadic bursting to 6ft
23351 22 Aug 2022 @ 0843 22 Aug 2022 @ 0929 BrianR Sporadic bursting to 6ft from main pool and the two satellite vents Never continuous enough to be called an eruption Satellite vents bursting fo first 10 only
23345 21 Aug 2022 @ 1746 21 Aug 2022 @ 1822 BrianR Sporadic bursting to 6ft
23344 21 Aug 2022 @ 1725 21 Aug 2022 @ 1730 BrianR Sporadic bursting to 4ft
23311 21 Aug 2022 @ 0958 21 Aug 2022 @ 1030 BrianR Sporadic bursting to 4 ft from main pool and it’s two satellite vents Satellite vents stopped 10:18 If would be nice to have a continuous vs sporadic type for entry
22931 29 Jul 2022 @ 1241 --- rbwhitaker A couple of small splashes as Grotto was starting.
19792 29 Sep 2021 @ 1540 --- Graham GF pressure pool came up slowly. SGF started splashing but it didn't erupt. Earlier GF pressure pool was rising on every cycle and SGF was erupting each cycle.
19790 29 Sep 2021 @ 1334 --- Graham Splashing in South Grotto Fountain small vents.
19148 29 Aug 2021 @ 1018 29 Aug 2021 @ 1048 BrianR Sporadic bursting from 2 to 10 ft
19046 24 Aug 2021 @ 1239 24 Aug 2021 @ 1327 BrianR Sporadic bursting to 8 ft at beginning of window to 2 ft near end of window
18639 24 Jul 2021 @ 1204 24 Jul 2021 @ 1217 BrianR Sporadic bursting to 4 ft
18607 23 Jul 2021 @ 1319 23 Jul 2021 @ 1321 BrianR Sporadic bursting to 2 ft
18606 23 Jul 2021 @ 1221 23 Jul 2021 @ 1229 BrianR Sporadic bursting to 8 ft
18605 23 Jul 2021 @ 1204 23 Jul 2021 @ 1217 BrianR Sporadic bursting to 4 ft
18597 22 Jul 2021 @ 1819 22 Jul 2021 @ 1913 BrianR Sporadic bursting to 6 ft
18596 22 Jul 2021 @ 1151 22 Jul 2021 @ 1156 BrianR Sporadic bursting to 4ft
18595 22 Jul 2021 @ 1027 22 Jul 2021 @ 1119 BrianR Sporadic bursting to 6 ft
17981 21 Jun 2021 @ 1438 --- William more splashing to 1'
17980 21 Jun 2021 @ 1418 --- William splashing to 1'
15772 28 Aug 2020 @ 1641 28 Aug 2020 @ 1733 BrianR Sporadic bursting up to 6 ft at start of note to 1 ft at end
15724 24 Aug 2020 @ 1710 24 Aug 2020 @ 1746 BrianR Sporadic bursting to 6 ft
15722 24 Aug 2020 @ 1019 24 Aug 2020 @ 1035 BrianR Sporadic splashes 1 to 2 ft
15718 23 Aug 2020 @ 1421 23 Aug 2020 @ 1431 BrianR Sporadic bursting from 2 to 4 ft
15717 23 Aug 2020 @ 1410 23 Aug 2020 @ 1413 BrianR Grotto Fountain like boil
15064 21 Jul 2020 @ 0847 --- William splashed to 2' but did not erupt
15063 21 Jul 2020 @ 0842 --- William splashed to 2' but did not erupt
14982 14 Jul 2020 @ 1628 14 Jul 2020 @ 1632 nails Intermittent splashing to a few feet
14819 30 Jun 2020 @ 1940 30 Jun 2020 @ 2000 BrianR Sporadic bursting to 6 ft Still going when I left the Grotto area
14797 29 Jun 2020 @ 1348 29 Jun 2020 @ 1435 BrianR Sporadic bursting to 6 ft
14742 26 Jun 2020 @ 1432 26 Jun 2020 @ 1440 BrianR Sporadic bursting to 2 ft , started and ended during Rocket Major
14741 26 Jun 2020 @ 1359 26 Jun 2020 @ 1426 BrianR Sporadic bursting to 6 ft, ended when Rocket Major started
13407 26 Aug 2019 @ 1020 26 Aug 2019 @ 1037 BrianR Sporadic bursting up to 6ft
13403 25 Aug 2019 @ 1533 25 Aug 2019 @ 1545 BrianR Sporadic bursting to 2 ft
13371 24 Aug 2019 @ 0730 24 Aug 2019 @ 0822 BrianR Sporadic bursting up to 6 ft before 8:00 up to 2 ft after
13367 23 Aug 2019 @ 1720 23 Aug 2019 @ 1812 BrianR Sporadic bursting 1 to 4 ft
12821 27 Jul 2019 @ 1330 27 Jul 2019 @ 1350 nails Intermittent bursting 1 to 6+ feet.
11980 26 Jun 2019 @ 1242 26 Jun 2019 @ 1342 BrianR Sporadic bursting 2 to 6 ft
11945 25 Jun 2019 @ 0648 25 Jun 2019 @ 0732 BrianR Sporadic bursting 2 to 6 ft
11944 24 Jun 2019 @ 1401 24 Jun 2019 @ 1436 BrianR Sporadic bursting 2 to 6 ft
11923 22 Jun 2019 @ 1241 22 Jun 2019 @ 1300 BrianR Sporadic bursts 2 to 3 ft
11902 21 Jun 2019 @ 1101 21 Jun 2019 @ 1147 BrianR Sporadic bursting 2 to 6 ft
5613 02 Sep 2017 @ 1745 --- WillBoekel weak splashing that looks like it is coming from depth.
2434 28 Sep 2015 @ 1005 --- Tara Splashing to about 1 foot.
854 03 Jul 2006 @ 0700 --- Tara South Grotto Fountain was active having eruptions at intervals of 7 to 15 minutes starting sometime before 0700. The eruptions alternated with high water levels in Indicator Spring and boiling episodes in Grotto Fountain.
7075 27 Oct 1992 @ 0000 27 Oct 1992 @ 2359 JarnoO no time given; d=17m16s
EntrySourceLinkComment
26 Jun 2020 @ 1353 JoeN https://www.youtube.com/watch?v=nxyrJ5gkvQA SGF video
06 Jun 2016 @ 1733 JSJ https://www.flickr.com/photos/jsjgeology/30892530906 Photo (1 of 5) of South Grotto Fountain Geyser's 5:33 PM-onward eruption on 6 June 2016.
06 Jun 2016 @ 1733 JSJ https://www.youtube.com/watch?v=m-Yr-A9rNLU All ten clips of this video compilation show South Grotto Fountain Geyser's 5:33 PM-onward eruption on 6 June 2016.
Baseline does not exist.