Last Known Eruption
4h 45m ago

Latest Eruptions

Eruption DurationInterval
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
12 Jun 2020 @ 2044 ie wc5h 52m
12 Jun 2020 @ 1452 ie wc6h 5m
12 Jun 2020 @ 0847 wc14h 9m
11 Jun 2020 @ 1838 ns10h 41m
11 Jun 2020 @ 0757 ie wc10h 36m
10 Jun 2020 @ 2121 ie wc5h 21m
10 Jun 2020 @ 1600 ie wc18h 25m
09 Jun 2020 @ 2135 wc5h 41m
09 Jun 2020 @ 15548h 33m
09 Jun 2020 @ 0721 wc1d 2h 18m
08 Jun 2020 @ 0503 ns wc17h 37m
07 Jun 2020 @ 1126 ie wc1d 2h 41m
06 Jun 2020 @ 0845 ie wc10h 29m
05 Jun 2020 @ 2216 ns wc1d 17h 44m
04 Jun 2020 @ 0432 ns wc10h 8m
03 Jun 2020 @ 18247h 1m
03 Jun 2020 @ 11235h 33m
03 Jun 2020 @ 0550 ns wc8h 8m
02 Jun 2020 @ 2142 ie wc4h 14m
02 Jun 2020 @ 1728 wc7h 6m
02 Jun 2020 @ 1022 ns3h 11m
02 Jun 2020 @ 0711 ns6h 55m
02 Jun 2020 @ 0016 ns wc8h 20m
01 Jun 2020 @ 1556 ie wc7h 34m
01 Jun 2020 @ 0822 wc17h 25m
31 May 2020 @ 1457 ie wc4h 46m
31 May 2020 @ 1011 ie wc15h 23m
30 May 2020 @ 1848 ie wc4h 42m
30 May 2020 @ 1406 wc>1h 47m 18h 4m
29 May 2020 @ 2002 wc6h 38m
29 May 2020 @ 1324 ie wc5h 23m
29 May 2020 @ 0801 ie wc13h 1m
28 May 2020 @ 1900 ie wc4h 3m
28 May 2020 @ 1457 ie wc1d 43m
27 May 2020 @ 1414 ie8h 27m
27 May 2020 @ 0547 ie wc12h 2m
26 May 2020 @ 1745 ie wc5h 38m
26 May 2020 @ 1207 ie wc5h 12m
26 May 2020 @ 0655 wc~1h 28m 11h 41m
25 May 2020 @ 1914 ie wc6h 33m
25 May 2020 @ 1241 ie wc22h 9m
24 May 2020 @ 1432 ie wc6h 48m
24 May 2020 @ 0744 ns1d 21h 38m
22 May 2020 @ 1006 wc17h 31m
21 May 2020 @ 16354h 11m
21 May 2020 @ 1224 wc6h 29m
21 May 2020 @ 0555 ie wc18h 36m
20 May 2020 @ 1119 wc18h 49m
19 May 2020 @ 1630 ie wc4h 53m
19 May 2020 @ 1137 ie wc1d 5h 13m
18 May 2020 @ 0624 ie wc16h 33m
17 May 2020 @ 1351 ns wc1d 25m
16 May 2020 @ 1326 ie wc1d 7h 30m
15 May 2020 @ 0556 ie wc18h 52m
14 May 2020 @ 1104 ie wc23h 48m
13 May 2020 @ 1116 wc1d 20h 14m
11 May 2020 @ 1502 ie wc5h 16m
11 May 2020 @ 0946 ie wc16h 41m
10 May 2020 @ 17051d 2h 29m

Interval Statistics

Interval Count100
Min3h 11m
Max2d 4h 55m
Mean13h 33m
Median9h 4m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
10534 02 Oct 2018 @ 2322 --- Tara No eruption yet.
10489 28 Sep 2018 @ 1028 --- Tara Catchbasins steamy, runoff channels had light flow amd Variable down ~1/2 inch. Possible missed eruption?
10463 26 Sep 2018 @ 1007 --- Micah Kipple Off. No rocket.
10351 23 Sep 2018 @ 0025 --- Tara Had not started again as of 0025.
10207 15 Sep 2018 @ 0908 --- Brian Grotto off
10184 13 Sep 2018 @ 1824 --- Brian Ended at 1824
10176 13 Sep 2018 @ 0940 --- Polly Grotto off.
10147 11 Sep 2018 @ 1216 --- Kyle eruption ended
10101 08 Sep 2018 @ 1218 --- rbwhitaker Off at 1218
10069 06 Sep 2018 @ 1500 --- Kyle Grotto end at 1500 D=1hr 39m
10000 03 Sep 2018 @ 0955 --- Pat Snyder Off at 0955
9972 01 Sep 2018 @ 0432 --- Kyle ended at 04:32
9783 19 Aug 2018 @ 1615 --- Micah Kipple Off....
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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