Last Known Eruption
5d 21h 41m ago

Latest Eruptions

Eruption DurationInterval
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
11 Sep 2022 @ 1435~3m 9m
11 Sep 2022 @ 1426~3m 11m
11 Sep 2022 @ 1415~4m 14m
11 Sep 2022 @ 1401~2.5m 10m
11 Sep 2022 @ 1351 ns ini11d 3h 5m
31 Aug 2022 @ 104617h 21m
30 Aug 2022 @ 1725 ie1d 6h 14m
29 Aug 2022 @ 111124m
29 Aug 2022 @ 104720m 4d 18h 21m
24 Aug 2022 @ 16267m 6h 11m
24 Aug 2022 @ 10152m 11m
24 Aug 2022 @ 10048m 2d 16h 45m
21 Aug 2022 @ 17193m 7h 31m
21 Aug 2022 @ 09481m 6d 20h 55m
14 Aug 2022 @ 1253 A21d 2h 39m
24 Jul 2022 @ 1014~9m 19d 17h 1m
04 Jul 2022 @ 17133d 21h 56m
30 Jun 2022 @ 1917 ns15d 23h 6m
14 Jun 2022 @ 2011~1m 9m
14 Jun 2022 @ 2002~6m 33m
14 Jun 2022 @ 1929~3m 10d 11h 37m
04 Jun 2022 @ 075210h 52m
03 Jun 2022 @ 21004m 2d 7h 18m
01 Jun 2022 @ 134229d 2h 18m
03 May 2022 @ 112474d 31m
18 Feb 2022 @ 0953 ns112d 20h 8m
28 Oct 2021 @ 14451d 18m
27 Oct 2021 @ 1427 ie15d 4h 40m
12 Oct 2021 @ 0947 ie4d 23h 54m
07 Oct 2021 @ 09537d 17h 52m
29 Sep 2021 @ 1601 ie38m
29 Sep 2021 @ 15233m 8m
29 Sep 2021 @ 15153m 8m
29 Sep 2021 @ 15073m 12m
29 Sep 2021 @ 14553m 9m
29 Sep 2021 @ 14463m 12m
29 Sep 2021 @ 14342m 20m
29 Sep 2021 @ 14144m 19h 20m
28 Sep 2021 @ 18549m
28 Sep 2021 @ 184511d 2h 54m
17 Sep 2021 @ 155112m 7h 51m
17 Sep 2021 @ 0800 ie23m
17 Sep 2021 @ 0737 ie14d 14h 33m
02 Sep 2021 @ 17049m 1d 3h 31m
01 Sep 2021 @ 13333d 3h 41m
29 Aug 2021 @ 095211m 4d 21h 23m
24 Aug 2021 @ 12292m 6h 0m
24 Aug 2021 @ 0629 ns10h 58m
23 Aug 2021 @ 19319m 8m
23 Aug 2021 @ 19231d 10h 55m
22 Aug 2021 @ 08287m
22 Aug 2021 @ 082119h 15m
21 Aug 2021 @ 1306 ie28m
21 Aug 2021 @ 12382m 10d 22h 35m
10 Aug 2021 @ 140311m 1d 21h 40m
08 Aug 2021 @ 1623~9m 9m
08 Aug 2021 @ 1614~6m 15d 4h 15m
24 Jul 2021 @ 11592m 15h 22m
23 Jul 2021 @ 20371m 9m
23 Jul 2021 @ 20284m 8h 11m
23 Jul 2021 @ 12172m 18m
23 Jul 2021 @ 11592m 17h 42m
22 Jul 2021 @ 18172m 20m
22 Jul 2021 @ 175717m 7h 58m
22 Jul 2021 @ 095919m 5d 16h 37m
16 Jul 2021 @ 17222m 12m
16 Jul 2021 @ 17102m 15m
16 Jul 2021 @ 16552m 12m
16 Jul 2021 @ 16434m 12m
16 Jul 2021 @ 16314m 5h 48m
16 Jul 2021 @ 10431d 2h 59m

Interval Statistics

Interval Count100
Min5m
Max112d 20h 8m
Mean6d 20h 1m
Median9h 31m

Latest Notes

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