Last Known Eruption
1h 18m ago

Latest Eruptions

Eruption DurationInterval
26 Sep 2020 @ 1152 ie wc2d 4h 53m
24 Sep 2020 @ 0659 ie wc12h 45m
23 Sep 2020 @ 1814 ie wc1d 3h 52m
22 Sep 2020 @ 1422 ie wc1d 1m
21 Sep 2020 @ 14215h 51m
21 Sep 2020 @ 08301d 1h 20m
20 Sep 2020 @ 0710 ie17h 50m
19 Sep 2020 @ 1320 ie2d 5h 23m
17 Sep 2020 @ 0757 ie23h 5m
16 Sep 2020 @ 0852 ie wc23h 47m
15 Sep 2020 @ 0905 ie wc13h 16m
14 Sep 2020 @ 19496h 17m
14 Sep 2020 @ 13321h 38m 6h 55m
14 Sep 2020 @ 0637 ie15h 6m
13 Sep 2020 @ 15316h 26m
13 Sep 2020 @ 0905 ie wc>45m 1h 28m
13 Sep 2020 @ 0737 ie17h 41m
12 Sep 2020 @ 13566h 6m
12 Sep 2020 @ 0750 ns16h 14m
11 Sep 2020 @ 15364h 37m
11 Sep 2020 @ 105920h 8m
10 Sep 2020 @ 1451 ns3h 51m
10 Sep 2020 @ 1100 ns4h 45m
10 Sep 2020 @ 0615 ns wc13h 39m
09 Sep 2020 @ 1636 ie wc2d 8h 56m
07 Sep 2020 @ 0740 ie15h 18m
06 Sep 2020 @ 1622 wc4h 38m
06 Sep 2020 @ 1144 ie2h 31m
06 Sep 2020 @ 0913 wc1h 41m 16h 46m
05 Sep 2020 @ 1627 ie wc6h 37m
05 Sep 2020 @ 0950 ie14h 50m
04 Sep 2020 @ 1900 ie3h 30m
04 Sep 2020 @ 15301h 20m 7h 0m
04 Sep 2020 @ 0830 ns8h 46m
03 Sep 2020 @ 2344 ie wc4h 15m
03 Sep 2020 @ 1929 ns13h 21m
03 Sep 2020 @ 0608 ns wc10h 27m
02 Sep 2020 @ 19415h 24m
02 Sep 2020 @ 1417 ie wc>1h 46m 5h 56m
02 Sep 2020 @ 0821 ns9h 56m
01 Sep 2020 @ 2225 ie8h 40m
01 Sep 2020 @ 1345 ie wc>2h 20m 1h 5m
01 Sep 2020 @ 12401d 23m
31 Aug 2020 @ 12172h 4m 23h 32m
30 Aug 2020 @ 12451d 5h 33m
29 Aug 2020 @ 0712 ie14h 51m
28 Aug 2020 @ 16212h 32m 1d 9h 35m
27 Aug 2020 @ 0646 ie wc23h 46m
26 Aug 2020 @ 0700 ie15h 54m
25 Aug 2020 @ 15066h 0m
25 Aug 2020 @ 09062h 3m 16h 7m
24 Aug 2020 @ 16592h 16m 7h 9m
24 Aug 2020 @ 09502h 21m 19h 37m
23 Aug 2020 @ 14131h 58m 1d 7h 25m
22 Aug 2020 @ 0648 ie15h 51m
21 Aug 2020 @ 14571d 6h 18m
20 Aug 2020 @ 08391d 17h 47m
18 Aug 2020 @ 1452~1d 12m
17 Aug 2020 @ 1440 ie4h 17m
17 Aug 2020 @ 10235h 45m
17 Aug 2020 @ 0438 ie8h 34m
16 Aug 2020 @ 2004 ie8h 21m
16 Aug 2020 @ 11436h 14m
16 Aug 2020 @ 0529 ie wc14h 4m
15 Aug 2020 @ 152510h 5m
15 Aug 2020 @ 0520 ie wc>2h 17m 11h 41m
14 Aug 2020 @ 1739 ie wc>3h 41m 5h 35m
14 Aug 2020 @ 1204 ie wc>44m 1d 3h 8m
13 Aug 2020 @ 0855:111d 1h 43m
12 Aug 2020 @ 07121d 11h 45m
10 Aug 2020 @ 1927 ie wc>20h 8m 4h 48m
10 Aug 2020 @ 1439 ie wc>1h 42m 5h 52m
10 Aug 2020 @ 0847 wc>57m 17h 50m
09 Aug 2020 @ 1457 ie wc6h 19m
09 Aug 2020 @ 0838 ie wc12h 58m
08 Aug 2020 @ 1940 ie wc12h 24m
08 Aug 2020 @ 0716 ie wc1d 8h 17m
06 Aug 2020 @ 2259 ie wc>15h 51m 7h 34m
06 Aug 2020 @ 1525 ie wc>2h 11m 6h 45m
06 Aug 2020 @ 084010h 2m
05 Aug 2020 @ 2238 wc3h 41m 23h 48m
04 Aug 2020 @ 2250 ie wc>10h 57m 9h 23m
04 Aug 2020 @ 13278h 45m
04 Aug 2020 @ 0442 ie wc4h 54m
03 Aug 2020 @ 2348 wc1h 4m 2d 4h 36m
01 Aug 2020 @ 1912 ie wc>1d 10h 0m 6h 6m
01 Aug 2020 @ 1306 ie wc>2h 27m 7h 16m
01 Aug 2020 @ 0550 ie wc>2h 24m 11h 40m
31 Jul 2020 @ 1810 ie wc>1h 46m 7h 7m
31 Jul 2020 @ 1103 ie wc>3h 11m 15h 3m
30 Jul 2020 @ 2000 ie wc4h 38m
30 Jul 2020 @ 1522 wc>1h 16m 4h 1m
30 Jul 2020 @ 1121 ie wc18h 26m
29 Jul 2020 @ 1655 ie wc5h 50m
29 Jul 2020 @ 1105 ie wc18h 8m
28 Jul 2020 @ 1657 wc1d 2h 41m
27 Jul 2020 @ 1416 wc>1h 55m 6h 19m
27 Jul 2020 @ 0757 ie14h 4m
26 Jul 2020 @ 1753 wc7h 56m
26 Jul 2020 @ 0957 ie wc1d 18h 58m

Interval Statistics

Interval Count100
Min1h 5m
Max2d 8h 56m
Mean15h 19m
Median12h 2m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
16246 24 Sep 2020 @ 1905 24 Sep 2020 @ 1935 William Grotto ie at this time, may still be ie from morning eruption
16214 20 Sep 2020 @ 1831 20 Sep 2020 @ 2000 William after being quiet all day after this morning's eruption water was visible in the pressure pool at 18:31 along with light splashing in Grotto Fountain. Same at 19:17. left for Grand but did not see steam to indicate an eruption prior to 20:00
16182 18 Sep 2020 @ 1920 --- JarnoO (wc) Appears to have quit some time before 1920. Have seen it ie continuously throughout the day.
16185 18 Sep 2020 @ 1752 --- Ben VL Off by this time.
16164 18 Sep 2020 @ 0736 --- CraigC still ie
16180 18 Sep 2020 @ 0453 --- Graham ie, believe a continuation from yesterdays eruption.
16083 12 Sep 2020 @ 1041 --- TheHikingDude grotto off
16072 11 Sep 2020 @ 1855 --- William grotto complex quiet
16018 07 Sep 2020 @ 1845 07 Sep 2020 @ 1956 William ie during this time, assumed to be still ie from this mornings eruption.
15958 04 Sep 2020 @ 1650 --- CraigC Grotto off
15956 04 Sep 2020 @ 1320 --- TheHikingDude grotto off
15950 04 Sep 2020 @ 0940 --- TheHikingDude Grotto off
15936 02 Sep 2020 @ 1623 --- CraigC grotto off
15920 31 Aug 2020 @ 1421 --- CraigC end of eruption
15890 29 Aug 2020 @ 1350 --- BrianR End of eruption
15773 28 Aug 2020 @ 1853 --- BrianR End of eruption
15754 27 Aug 2020 @ 1831 --- BrianR Still ie when I left area
15733 26 Aug 2020 @ 1837 --- JarnoO (wc) Been ie at all times since we panned away from Giantess and the Hill for short times after about noon or so. Not sure if this is a continuation of 0700ie eruption or a separate one.
15729 25 Aug 2020 @ 1109 --- BrianR End of eruption
15725 24 Aug 2020 @ 1915 --- BrianR End of eruption
15723 24 Aug 2020 @ 1211 --- BrianR End of eruption
15716 23 Aug 2020 @ 1611 --- BrianR End of eruption
15715 22 Aug 2020 @ 1124 --- BrianR End of eruption
15669 21 Aug 2020 @ 1755 --- Forestbewithyou Grotto is off.
15646 19 Aug 2020 @ 0630 --- JarnoO (wc) 1452 08-18 marathon continues. Still ie 0630, 0734, 0829
15569 14 Aug 2020 @ 0545 --- JarnoO marathon quit somewhere overnight
15506 11 Aug 2020 @ 0116 --- JarnoO (wc) 1927 ie marathon continues. Still ie (overnight captures) 0116, 0200, 0253, 0400, 0500, 0546, (live) 0714, 0812, 0906, 1013, 1207, 1335, 1400, 1455. Quit 1535.
15458 08 Aug 2020 @ 0825 --- JarnoO (wc) Off by this time. Might've been off since at least 0808, though.
15421 07 Aug 2020 @ 0000 --- JarnoO (wc) 2259ie marathon continues. Still ie (overnight captures) 0000, 0058, 0200, 0300, 0358, 0500, 0521, (live) 0642, 0703, 0808, 0911, 1050, 1202, 1310, 1357, 1450. Done by 1532.
15378 05 Aug 2020 @ 0100 --- JarnoO (wc) 2250ie marathon continues. Still ie (overnight captures) 0100, 0200, 0316 (inbetween 0316 and 0533 obscured or cam not on Grotto), 0533, (live) 0657, 0807, 0913. Turned off ±0947
15362 04 Aug 2020 @ 1657 --- JarnoO (wc) Done by this time.
15163 03 Aug 2020 @ 0000 --- JarnoO (wc) 08-01 1912 ie marathon continues. Still ie (overnight captures) 0000, 0100, 0213, 0300, 0408, 0512 (last observed before steam obscured location); (live) 0656 done? Definitely done 0720
15149 02 Aug 2020 @ 0043 --- JarnoO (wc) 08-01 1912ie marathon continues; still ie (overnight captures) 0043, 0200, 0300, 0400, 0511; (live) 0654, 0822, 0904, 1000, 1127, 1212, 1249, 1320, 1424, 1551, 1652, 1800, 1900, 1912 (24h observed ie), 1926 (last observed live); (daytime & overnight) 2004, 2119, 2200, 2300. See note 08-03 for follow-up.
15112 27 Jul 2020 @ 0952 --- JarnoO (wc) Turned off within about 1-2 minutes of this time.
15097 25 Jul 2020 @ 0618 --- JarnoO (wc) marathon continued overnight; still ie 0618, 0658, 0804, 0843, 0929, 1025, 1058, 1146, 1238, 1310, 1404, 1459 (24h), 1600. Off by 1647(?).
15013 17 Jul 2020 @ 0537 --- JarnoO (wc) marathon continued overnight; still ie 0630, 0649, 0721, 0749 (appeared quitting). Done by 0754
14994 16 Jul 2020 @ 0837 --- William Something in the Grotto complex began at this time, most likely Grotto.
14958 12 Jul 2020 @ 0706 --- JarnoO (wc) marathon continued overnight; still ie 0743; done by 0921
14913 09 Jul 2020 @ 1334 --- JarnoO (wc) off at this time
14909 08 Jul 2020 @ 1735 --- JarnoO (wc) off at this time. Probably not the same eruption as this morning's ie one, based on Rocket eruption.
14903 07 Jul 2020 @ 0849 --- JarnoO (wc) still ie at this time
14868 04 Jul 2020 @ 0800 --- JarnoO (wc) Off at this time. Probably already off some 30 minutes ago, but didn't pay close attention to the stream at that time (but did occasionally see a frame of no steam from Grotto).
14854 02 Jul 2020 @ 1925 --- JarnoO (wc) turned off approximately at this time
14863 02 Jul 2020 @ 1234 --- BrianR End of eruption
14864 02 Jul 2020 @ 0758 --- BrianR End of eruption
14841 01 Jul 2020 @ 1910 --- BrianR End of eruption
14840 01 Jul 2020 @ 1325 --- BrianR End of eruption
14823 01 Jul 2020 @ 0807 01 Jul 2020 @ 0843 JarnoO (wc) Still ie 0807, 0814, 0821, 0836. Not ie 0843.
14839 01 Jul 2020 @ 0837 --- BrianR End of eruption
14821 30 Jun 2020 @ 2120 --- BrianR End of eruption
14818 30 Jun 2020 @ 1404 --- BrianR End of eruption
14800 30 Jun 2020 @ 0655 --- BrianR End of eruption
14796 29 Jun 2020 @ 1600 --- BrianR End of eruption
14764 29 Jun 2020 @ 0645 --- BrianR End of eruption
14751 28 Jun 2020 @ 0738 --- BrianR End of eruption time will tell if this the same eruption as yesterday
14749 28 Jun 2020 @ 0613 --- BrianR Grotto still ie Almost 100% sure this is the same eruption from yesterday All fountain area dry and without steam from vents Marathon Pool has a few inches of water in it with a continuous boil Variable Spring water level low enough to expose a dry ring inside its edge wall Giant platform waterless nothing but steam
14744 27 Jun 2020 @ 1155 --- JarnoO (wc) (still) ie at this time. Also 1250, 1343, 1456, 1639, 1723, 1841, 1943.
14740 26 Jun 2020 @ 1631 --- BrianR End of eruption
14678 19 Jun 2020 @ 1242 --- Ben VL Grotto off.
14538 04 Jun 2020 @ 1510 --- William still ie at this time
14205 18 May 2020 @ 1800 --- Janet Jones Near end. Off by 1800.
14179 25 Apr 2020 @ 1500 --- MikeG (wc) Quit between 14:50 and 15:00
13668 12 Sep 2019 @ 1808 --- bhoppe Eruption done
13642 10 Sep 2019 @ 1430 10 Sep 2019 @ 1453 B**2 Grotto shutdown between end of Grand & passing Grotto.
13592 06 Sep 2019 @ 1202 --- EmilyW Off by now
13579 05 Sep 2019 @ 1458 --- Polly Already off
13478 31 Aug 2019 @ 1003 --- BrianR End of eruption
13464 30 Aug 2019 @ 1129 --- BrianR End of eruption
13458 30 Aug 2019 @ 0715 --- BrianR End of eruption
13454 29 Aug 2019 @ 1717 --- BrianR End of eruption
13453 29 Aug 2019 @ 0916 --- BrianR End of eruption
13442 28 Aug 2019 @ 1645 --- BrianR End of eruption
13437 28 Aug 2019 @ 1001 --- BrianR End of eruption
13420 27 Aug 2019 @ 1740 --- BrianR End of eruption
13419 27 Aug 2019 @ 1425 --- BrianR End of eruption
13418 27 Aug 2019 @ 0915 --- BrianR End of eruption
13411 26 Aug 2019 @ 1919 --- BrianR End of eruption
13409 26 Aug 2019 @ 1556 --- BrianR End of eruption
13408 26 Aug 2019 @ 1205 --- BrianR End of eruption
13402 25 Aug 2019 @ 1833 --- BrianR End of eruption
13379 24 Aug 2019 @ 1705 --- BrianR End of eruption
13366 23 Aug 2019 @ 1812 --- BrianR End of eruption
13355 23 Aug 2019 @ 0758 --- EmilyW Grotto off. Bijou off save a few weak splashes, marathon pool down about a foot.
13328 20 Aug 2019 @ 1408 --- JarnoO (wc) Off by this time.
13199 12 Aug 2019 @ 1820 --- JarnoO (wc) Grotto already off by this time. Unsure if this marks the end of the 1235 eruption.
13044 05 Aug 2019 @ 1736 --- KarlH Still IE. Spa is up.
12864 29 Jul 2019 @ 0850 29 Jul 2019 @ 0907 rbwhitaker This geyser is an enigma today. It built to what I would call an eruption very slowly. Both Rocket and Grotto were putting out a lot of water. Central Vents were active. No Grotto Fountain. But then it slowly faded and was completely off (except deep rumbling) by 907. So either a short, weak eruption or maybe ridiculously strong buildup.
12861 29 Jul 2019 @ 0740 --- rbwhitaker Grotto looked like it was going to start. No Grotto Fountain. The Central Vents started erupting at about 742 and now at 747 Grotto, Rocket, and the Central Vents have all backed down to deep rumbling noises with no water visible.
12561 22 Jul 2019 @ 1614 --- Tara Off by 1614.
12472 12 Jul 2019 @ 1640 --- ldgordon Central vents active with weak splashing from fountain
12399 07 Jul 2019 @ 1130 --- User34 Turned off around this time
12089 03 Jul 2019 @ 0905 --- lc off by 0905
12048 30 Jun 2019 @ 1441 --- MikeG Eruption ended before 14:40
12047 29 Jun 2019 @ 2040 --- MikeG Eruption ended between 20:30 and 20:40
12019 28 Jun 2019 @ 1843 --- JarnoO Quit already by this time.
12003 28 Jun 2019 @ 1321 --- BrianR End of eruption
11982 27 Jun 2019 @ 0710 --- BrianR End of eruption
11981 26 Jun 2019 @ 1623 --- BrianR End of eruption
11963 25 Jun 2019 @ 2020 --- BrianR Still ie
11937 24 Jun 2019 @ 1808 --- Polly Still ie
EntrySourceLinkComment
18 Aug 2020 @ 1452 JSJ https://www.youtube.com/watch?v=L4pz9gWnQwk Video by Craig Corless showing the start of Grotto Geyser's 2:52 PM-onward eruption on 18 August 2020, with both Grotto Fountain Geyser & South Grotto Fountain Geyser erupting in the background.
03 Oct 2019 @ 1526 EricZ https://www.youtube.com/watch?v=YpsAVShVyxs&feature=youtu.be Grotto Start
15 Aug 2018 @ 0941 JSJ https://www.flickr.com/photos/jsjgeology/32563168958 Photo of initial runoff (approaching Variable Spring) from Grotto Geyser's 9:41 AM-onward eruption on 15 August 2018.
15 Aug 2018 @ 0941 JSJ https://www.flickr.com/photos/jsjgeology/44618689690 Photo of Grotto Geyser's 9:41 AM-onward eruption on 15 August 2018.
14 Aug 2015 @ 1314 JSJ https://www.flickr.com/photos/jsjgeology/21145226344 Photo of Grotto Geyser's 1:14 PM-onward eruption on 14 August 2015.
08 Jul 2014 @ 1430 JSJ https://www.flickr.com/photos/jsjgeology/15106150617 Photo of Grotto Geyser erupting during the mid-afternoon of 8 July 2014.
Baseline does not exist.


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