Last Known Eruption
1d 6h 16m ago

Latest Eruptions

Eruption DurationInterval
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
24 Jul 2020 @ 1459 wc>1d 1h 1m 4h 30m
24 Jul 2020 @ 1029 ie wc16h 49m
23 Jul 2020 @ 1740 wc4h 27m
23 Jul 2020 @ 1313 wc7h 33m
23 Jul 2020 @ 0540 A12h 11m
22 Jul 2020 @ 1729 ie wc9h 24m
22 Jul 2020 @ 0805 ie wc13h 0m
21 Jul 2020 @ 1905 ns10h 35m
21 Jul 2020 @ 08301d 16h 18m
19 Jul 2020 @ 1612 ie wc9h 9m
19 Jul 2020 @ 0703 ie wc20h 10m
18 Jul 2020 @ 1053 wc<7h 58m 2d 2h 1m
16 Jul 2020 @ 0852 ie wc>22h 57m 13h 49m
15 Jul 2020 @ 1903 ie wc11h 2m
15 Jul 2020 @ 0801 ie wc15h 35m
14 Jul 2020 @ 16267h 38m
14 Jul 2020 @ 0848 ie wc18h 17m
13 Jul 2020 @ 1431 ie wc>2h 20m 2d 1h 37m
11 Jul 2020 @ 1254 ie wc>19h 19m 4h 42m
11 Jul 2020 @ 0812 ie wc>3h 4m 15h 42m
10 Jul 2020 @ 1630 ns5h 44m
10 Jul 2020 @ 1046 ie4h 27m
10 Jul 2020 @ 0619 ie wc12h 27m
09 Jul 2020 @ 1752 ie wc6h 39m
09 Jul 2020 @ 1113 ns wc16h 13m
08 Jul 2020 @ 1900 ie wc13h 14m
08 Jul 2020 @ 0546 ie wc15h 44m
07 Jul 2020 @ 1402 ie wc7h 31m
07 Jul 2020 @ 0631 ie5h 31m
07 Jul 2020 @ 0100 wc6h 8m
06 Jul 2020 @ 1852 ie wc4h 41m
06 Jul 2020 @ 1411 ie wc4h 32m
06 Jul 2020 @ 0939 ie wc12h 26m
05 Jul 2020 @ 2113 ie wc5h 53m
05 Jul 2020 @ 1520 ie wc5h 28m
05 Jul 2020 @ 0952 ie wc>2h 13m 7h 53m
05 Jul 2020 @ 0159 wc4h 17m
04 Jul 2020 @ 2142 ns6h 26m
04 Jul 2020 @ 1516 ie wc>2h 56m 4h 33m
04 Jul 2020 @ 1043 ns3h 27m
04 Jul 2020 @ 0716 ie12h 23m
03 Jul 2020 @ 1853 ie wc4h 48m
03 Jul 2020 @ 1405 wc1h01m < d < 1h40m4h 33m
03 Jul 2020 @ 0932 ie wc>1h 30m 3h 57m
03 Jul 2020 @ 0535 ie wc>1h 15m 12h 21m
02 Jul 2020 @ 1714 ie5h 36m
02 Jul 2020 @ 113856m 5h 13m
02 Jul 2020 @ 0625 ie12h 24m
01 Jul 2020 @ 18011h 9m 6h 24m
01 Jul 2020 @ 11371h 58m 4h 24m
01 Jul 2020 @ 07131h 24m 11h 55m
30 Jun 2020 @ 19182h 2m 7h 9m
30 Jun 2020 @ 12091h 55m 5h 50m
30 Jun 2020 @ 0619 ie16h 49m
29 Jun 2020 @ 13302h 30m 7h 41m
29 Jun 2020 @ 0549 ie1d 23h 29m
27 Jun 2020 @ 0620 ie>7h 46m
26 Jun 2020 @ 2234 ns8h 40m
26 Jun 2020 @ 13542h 37m 1d 6h 1m
25 Jun 2020 @ 0753 wc14h 18m
24 Jun 2020 @ 1735 ns wc10h 12m
24 Jun 2020 @ 0723 ie wc19h 45m
23 Jun 2020 @ 1138 ie2d 1h 39m
21 Jun 2020 @ 0959 ie wc15h 15m
20 Jun 2020 @ 1844 ns wc5h 35m
20 Jun 2020 @ 1309 ie20h 47m
19 Jun 2020 @ 1622 wc6h 54m
19 Jun 2020 @ 0928 ns13h 20m
18 Jun 2020 @ 2008 wc9h 22m
18 Jun 2020 @ 1046 ie wc>1h 49m 18h 41m
17 Jun 2020 @ 1605 ie wc1d 2h 14m
16 Jun 2020 @ 1351 ie8h 47m
16 Jun 2020 @ 0504 ie wc9h 21m
15 Jun 2020 @ 1943 ie wc7h 28m
15 Jun 2020 @ 1215 wc2d 4h 55m
13 Jun 2020 @ 0720 ns wc3h 14m
13 Jun 2020 @ 0406 ie wc7h 22m

Interval Statistics

Interval Count100
Min3h 14m
Max2d 4h 55m
Mean13h 13m
Median8h 58m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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
11922 22 Jun 2019 @ 0707 --- BrianR End of eruption
11901 21 Jun 2019 @ 1352 --- BrianR Grotto End
11882 19 Jun 2019 @ 1639 --- Polly Grotto appears to be ie, and I believe that this is still the eruption from earlier.
11832 16 Jun 2019 @ 1341 16 Jun 2019 @ 1344 Polly Grotto quiet.
11784 14 Jun 2019 @ 1211 --- Polly Grotto quiet with little steam and occasional low bubbling sound.
11705 10 Jun 2019 @ 1248 --- CrisG Central vents erupting
11627 07 Jun 2019 @ 1534 --- B**2 Shut down.
11573 04 Jun 2019 @ 1910 --- William off by 19:10
11553 03 Jun 2019 @ 2130 03 Jun 2019 @ 2140 William still IE
11547 03 Jun 2019 @ 1545 --- User34 Still ie
11496 02 Jun 2019 @ 0710 --- Kyle Grotto quietly rumbling some runoff channels lightly steaming. likely ended an eruption recently
11456 31 May 2019 @ 1511 --- EricZ off before 1511
11219 12 May 2019 @ 1630 --- Micah Kipple Still in Marathon at 1630.
11200 10 May 2019 @ 1030 --- udo Grotto off. Was on when I arrived about 0800. Possibly a 10k. Marathon pool down several inches. Bijou weak but not off.
11189 08 May 2019 @ 1242 --- MikeG Eruption started at 12:42.
11177 06 May 2019 @ 0656 --- RLJones Grotto is off and pressure pool is empty
11171 05 May 2019 @ 0733 05 May 2019 @ 0850 RLJones In eruption at 0733, off at approx 0850
11135 29 Apr 2019 @ 1855 --- Polly Grotto still ie from this morning. Snowstorm is coming in and I’m losing visibility.
11128 28 Apr 2019 @ 1108 28 Apr 2019 @ 1935 Polly Grotto group has been pretty quiet today (as observed from the Inn parking lot). The temperature today was below freezing all day, so steam clouds around the basin have been easy to see. Starting at about 1800, I could see varying small steam clouds in various spots in the area. There was one large steam cloud at 1758 that may have been Oblong. Duration was ~7 minutes with a slowdown at about 5 minutes.
11076 25 Apr 2019 @ 1739 --- Graham No Grotto steam cloud seen on webcam. Looks like just a big attempt at erupting by Grotto Fountain per DanS report.
11032 20 Apr 2019 @ 0949 20 Apr 2019 @ 1022 RMichaels Prior to Grotto's eruption, water was rising and falling cyclically in the pressure pool. I don't recall seeing it do this at all last year. No activity seen in Grotto Fountain during this period or at any other time today.
10980 13 Apr 2019 @ 1000 13 Apr 2019 @ 1930 MikeG In eruption from 10:09 until at least 19:20.
10873 20 Jan 2019 @ 1434 --- Graham still ie. variable spring down 6" and boiling. in a marathon. still ie 1615.
10792 25 Dec 2018 @ 1611 --- Janet Jones Trying to start - couldn’t wait due to early dinner reservations.
10705 02 Nov 2018 @ 1322 --- WillBoekel turned off at this time
10644 21 Oct 2018 @ 1042 --- rbwhitaker Off by 1042
10596 09 Oct 2018 @ 0726 --- hkoenig Off, but noisy.
10547 04 Oct 2018 @ 0815 04 Oct 2018 @ 0845 William Grotto still ie during the time I observed.
EntrySourceLinkComment
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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