Last Known Eruption
73d 12h 22m ago

Latest Eruptions

Eruption DurationInterval
30 Sep 2024 @ 11122d 17h 24m
27 Sep 2024 @ 17483d 9h 11m
24 Sep 2024 @ 0837m.1d 21h 36m
22 Sep 2024 @ 1101 ie1d 23h 3m
20 Sep 2024 @ 115819h 35m
19 Sep 2024 @ 162310d 5h 22m
09 Sep 2024 @ 1101 ns8d 15h 28m
31 Aug 2024 @ 19331.5m 4m
31 Aug 2024 @ 19292m 2d 4h 5m
29 Aug 2024 @ 15242m 4m
29 Aug 2024 @ 15201m 2d 22h 59m
26 Aug 2024 @ 16212h 29m 9m
26 Aug 2024 @ 16124.5m 11m
26 Aug 2024 @ 16017m 8m
26 Aug 2024 @ 15534m 24m
26 Aug 2024 @ 152921m 9m
26 Aug 2024 @ 15204m 9m
26 Aug 2024 @ 15114m 9m
26 Aug 2024 @ 15026m 9m
26 Aug 2024 @ 14533.5m 9m
26 Aug 2024 @ 14444.5m 9m
26 Aug 2024 @ 14354m 7m
26 Aug 2024 @ 14283.5m 7m
26 Aug 2024 @ 14213.5m 9m
26 Aug 2024 @ 14126m 9m
26 Aug 2024 @ 14039m 8m
26 Aug 2024 @ 13554m 10m
26 Aug 2024 @ 13456.5m 8m
26 Aug 2024 @ 13374.5m 9m
26 Aug 2024 @ 13285.5m 9m
26 Aug 2024 @ 13195m 7m
26 Aug 2024 @ 13123m 5h 22m
26 Aug 2024 @ 07503m 9m
26 Aug 2024 @ 07415m 4d 13h 2m
21 Aug 2024 @ 18394d 4m
17 Aug 2024 @ 18356d 3h 58m
11 Aug 2024 @ 1437 ns4d 5h 6m
07 Aug 2024 @ 09311d 8m
06 Aug 2024 @ 09233d 19h 11m
02 Aug 2024 @ 141233d 1h 26m
30 Jun 2024 @ 12467m 6h 0m
30 Jun 2024 @ 064610m 17h 51m
29 Jun 2024 @ 12550.5m 6m
29 Jun 2024 @ 12492m 23m
29 Jun 2024 @ 12264m 6h 0m
29 Jun 2024 @ 0626 ie4d 19h 38m
24 Jun 2024 @ 10481m 1d 3h 28m
23 Jun 2024 @ 07201m 18h 4m
22 Jun 2024 @ 13161m 2d 19h 16m
19 Jun 2024 @ 18001d 49m
18 Jun 2024 @ 171114m 4d 21h 28m
13 Jun 2024 @ 19439h 36m
13 Jun 2024 @ 10077d 20h 35m
05 Jun 2024 @ 13327h 7m
05 Jun 2024 @ 062512h 29m
04 Jun 2024 @ 1756 ie11d 3h 0m
24 May 2024 @ 14561h 26m
24 May 2024 @ 133011m
24 May 2024 @ 131914m
24 May 2024 @ 13055h 15m
24 May 2024 @ 075025d 17h 18m
28 Apr 2024 @ 143265d 19h 56m
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

Interval Statistics

Interval Count100
Min4m
Max120d 22h 50m
Mean4d 11h 40m
Median6h 0m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
37697 24 Oct 2024 @ 1131 --- rayceanderson Weak splashing near the start of Grotto, nothing more
37317 01 Oct 2024 @ 1352 --- ddshepard No eruption during Grotto Fountain and Grotto eruption except for a few small splashes.
36682 01 Sep 2024 @ 1253 --- BrianR Some 2ft bursts but did not erupt
36663 31 Aug 2024 @ 1134 31 Aug 2024 @ 1225 BrianR Sporadic bursting to 8ft
36613 29 Aug 2024 @ 1532 29 Aug 2024 @ 1552 BrianR Sporadic bursting to 4ft
36600 28 Aug 2024 @ 1348 --- BrianR A few 2ft bursts
36575 27 Aug 2024 @ 1648 27 Aug 2024 @ 1749 BrianR Sporadic bursting mostly under 4ft, although I saw a few to 8ft
36568 27 Aug 2024 @ 1152 27 Aug 2024 @ 1243 BrianR Sporadic bursting to 6ft
36563 27 Aug 2024 @ 0634 --- CraigC splashing
36561 26 Aug 2024 @ 1854 26 Aug 2024 @ 1908 BrianR Sporadic bursting to 6ft Left area at 19:08
36558 26 Aug 2024 @ 0756 26 Aug 2024 @ 0826 BrianR Sporadic bursting to 4ft
36477 19 Aug 2024 @ 1911 19 Aug 2024 @ 2050 Craigmon99 Bursting to 8 feet. No jets Startling occasionally splashing This has been happening on and off throughout this time period
36299 06 Aug 2024 @ 0639 --- CraigC splashing
36298 06 Aug 2024 @ 0625 --- CraigC splashing
36296 06 Aug 2024 @ 0615 --- CraigC splashing
36295 06 Aug 2024 @ 0604 --- CraigC splashing
36241 03 Aug 2024 @ 0627 --- CraigC splashing
36149 28 Jul 2024 @ 1217 --- Polly Steady bursts at this time. Occasional spurts before.
35917 16 Jul 2024 @ 1246 16 Jul 2024 @ 1253 Polly Intermittent 5-6 foot splashing
35646 30 Jun 2024 @ 1255 30 Jun 2024 @ 1409 BrianR Sporadic bursting to 6ft
35633 30 Jun 2024 @ 0723 30 Jun 2024 @ 0740 BrianR Sporadic bursting to 6ft
35630 30 Jun 2024 @ 0640 --- CraigC some splashing
35618 29 Jun 2024 @ 1232 29 Jun 2024 @ 1328 BrianR Sporadic bursting to 8fr at start of time frame to 2ft at end of time frame except for the continuous eruption times at 12:49 and 12:55
35614 29 Jun 2024 @ 0646 29 Jun 2024 @ 0715 BrianR Sporadic bursting to 6ft
35610 29 Jun 2024 @ 0623 --- CraigC bursting
35567 26 Jun 2024 @ 0733 26 Jun 2024 @ 0746 BrianR Sporadic bursting up to 4ft
35557 25 Jun 2024 @ 1354 25 Jun 2024 @ 1431 BrianR Sporadic bursting up to 6ft
35530 24 Jun 2024 @ 1745 24 Jun 2024 @ 1747 BrianR A few bursts to 4ft
35523 24 Jun 2024 @ 1052 24 Jun 2024 @ 1146 BrianR Sporadic bursting to 6ft
35472 23 Jun 2024 @ 0725 23 Jun 2024 @ 0802 BrianR Sporadic bursting to 8ft
35463 22 Jun 2024 @ 1317 22 Jun 2024 @ 1414 BrianR Sporadic bursting to 4 ft
35306 18 Jun 2024 @ 1328 --- aferrara one vent on SGF splashing about 1ft, sustained, with some splashing in SGF's main vent
34357 27 Apr 2024 @ 1038 --- DanS Burst of steam and gurgling as Grotto shut down.
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.