Last Known Eruption
5h 2m ago

Latest Eruptions

Eruption DurationInterval
09 Apr 2020 @ 1340 wc19h 56m
08 Apr 2020 @ 1744 ie wc9h 11m
08 Apr 2020 @ 0833 ns wc17h 58m
07 Apr 2020 @ 1435 ie wc2d 3h 29m
05 Apr 2020 @ 1106 ie wc1d 2h 37m
04 Apr 2020 @ 0829 ie12d 18h 31m
22 Mar 2020 @ 1358 ie wc21h 6m
21 Mar 2020 @ 1652 ns wc5d 21h 57m
15 Mar 2020 @ 1855 ns wc4d 9h 25m
11 Mar 2020 @ 0930 ie21h 44m
10 Mar 2020 @ 1146 wc20h 15m
09 Mar 2020 @ 1531 ie wc2d 22h 38m
06 Mar 2020 @ 1553 ie wc5d 6h 21m
01 Mar 2020 @ 0932 ie16h 47m
29 Feb 2020 @ 1645 ie6h 23m
29 Feb 2020 @ 1022 ie15h 54m
28 Feb 2020 @ 1828 ie5h 41m
28 Feb 2020 @ 1247 ie1d 3h 17m
27 Feb 2020 @ 0930 ie1d 21h 12m
25 Feb 2020 @ 1218 ie wc1d 19h 6m
23 Feb 2020 @ 1712 ns wc1d 3h 33m
22 Feb 2020 @ 1339 ie11d 4h 0m
11 Feb 2020 @ 0939 ns4d 43m
07 Feb 2020 @ 0856 ie23h 35m
06 Feb 2020 @ 0921 ie1d 19h 13m
04 Feb 2020 @ 1408 ie wc1d 21h 42m
02 Feb 2020 @ 1626 ns7h 26m
02 Feb 2020 @ 0900 ie15h 46m
01 Feb 2020 @ 1714 ns wc2d 7h 42m
30 Jan 2020 @ 0932 ie22h 43m
29 Jan 2020 @ 1049 ns wc6d 2h 36m
23 Jan 2020 @ 0813 ie1d 38m
22 Jan 2020 @ 0735 ie23h 21m
21 Jan 2020 @ 0814 ie16h 54m
20 Jan 2020 @ 1520 ie6d 5h 42m
14 Jan 2020 @ 0938 ie10d 17h 47m
03 Jan 2020 @ 1551 ie4d 53m
30 Dec 2019 @ 1458 ie4h 23m
30 Dec 2019 @ 10357d 20h 43m
22 Dec 2019 @ 1352 ie wc5d 4h 55m
17 Dec 2019 @ 0857 ns wc2d 2h 37m
15 Dec 2019 @ 0620 ie wc2d 22h 53m
12 Dec 2019 @ 0727 ie wc18h 8m
11 Dec 2019 @ 1319 wc6d 2m
05 Dec 2019 @ 1317 ns wc12d 37m
23 Nov 2019 @ 1240 ie6d 1h 14m
17 Nov 2019 @ 1126 ie wc1d 5h 4m
16 Nov 2019 @ 0622 ie6d 16h 27m
09 Nov 2019 @ 1355 ie wc1d 23h 3m
07 Nov 2019 @ 145222h 43m
06 Nov 2019 @ 1609 ie wc4d 1h 42m
02 Nov 2019 @ 1527 ie2d 1h 53m
31 Oct 2019 @ 1334 ns6d 21h 5m
24 Oct 2019 @ 1629 ie3d 1h 27m
21 Oct 2019 @ 1502 ie6d 5h 46m
15 Oct 2019 @ 0916 ie3d 15h 58m
11 Oct 2019 @ 1718 ns wc5d 6h 2m
06 Oct 2019 @ 1116 ie21h 39m
05 Oct 2019 @ 1337 wc1d 22h 11m
03 Oct 2019 @ 1526 wc6h 8m
03 Oct 2019 @ 0918 ie19h 0m
02 Oct 2019 @ 14181d 4h 31m
01 Oct 2019 @ 0947 ns2d 23h 55m
28 Sep 2019 @ 0952 ie1d 2h 58m
27 Sep 2019 @ 0654 ie13h 25m
26 Sep 2019 @ 172921h 57m
25 Sep 2019 @ 1932 ns1d 9h 51m
24 Sep 2019 @ 0941 ie16h 15m
23 Sep 2019 @ 1726 ie wc4h 44m
23 Sep 2019 @ 124222h 50m
22 Sep 2019 @ 1352 ie wc1d 2h 29m
21 Sep 2019 @ 1123 ie wc23h 2m
20 Sep 2019 @ 1221 ie1d 23m
19 Sep 2019 @ 1158 ns20h 11m
18 Sep 2019 @ 1547 ie wc2h 19m
18 Sep 2019 @ 1328 ie2h 39m
18 Sep 2019 @ 1049 ie2d 3h 14m
16 Sep 2019 @ 0735 ie15h 59m
15 Sep 2019 @ 1536 ie3h 53m
15 Sep 2019 @ 1142:4518h 4m
14 Sep 2019 @ 17385h 59m
14 Sep 2019 @ 11391d 1h 23m
13 Sep 2019 @ 101619h 0m
12 Sep 2019 @ 15162h 52m 6h 33m
12 Sep 2019 @ 0843 ie22h 31m
11 Sep 2019 @ 1012 ie wc22h 57m
10 Sep 2019 @ 11152d 18m
08 Sep 2019 @ 1057 ie20h 23m
07 Sep 2019 @ 14345h 0m
07 Sep 2019 @ 0934 ns19h 56m
06 Sep 2019 @ 1338 ie5h 5m
06 Sep 2019 @ 0833 ie20h 7m
05 Sep 2019 @ 12261d 8m
04 Sep 2019 @ 121821h 32m
03 Sep 2019 @ 1446 ie6h 51m
03 Sep 2019 @ 0755 ie1d 18h 15m
01 Sep 2019 @ 1340 ns4h 3m
01 Sep 2019 @ 0937 ie1d 1h 29m
31 Aug 2019 @ 08081h 55m 14h 3m
30 Aug 2019 @ 18058h 50m

Interval Statistics

Interval Count100
Min2h 19m
Max12d 18h 31m
Mean2d 5h 33m
Median1d 15m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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....
9752 17 Aug 2018 @ 1804 --- Tara Central Vents i.e.
9747 17 Aug 2018 @ 1356 --- Tara Grotto had several splashes inside its cone and Central Vents started, still i.e. at 1406.
9675 12 Aug 2018 @ 1643 12 Aug 2018 @ 1648 minissa Came upon Grotto, Rocket, and Central Vents splashing as though ie but all had shut down by 1447. Honestly not sure at this time if this was the end of a short, early eruption or an attempted start with something like a Central Vent delay???
9670 12 Aug 2018 @ 1420 --- BobInSLC 10:19 eruption still going strong
9671 12 Aug 2018 @ 1417 --- minissa Grotto turned back on after Rocket major approx 1417, then had turned off by end of Grand approx 1455
9601 10 Aug 2018 @ 1532 --- Tara Ended at about this time, definitely off by 1535. There may have been a Rocket major at 1510 but I could not see for sure from Fan & Mortar.
9578 09 Aug 2018 @ 1321 --- Tara Grotto end, no Rocket.
9571 09 Aug 2018 @ 0821 --- Tara Grotto off by this time.
9549 08 Aug 2018 @ 1338 --- Tara Grotto end.
9525 07 Aug 2018 @ 2025 --- Brian Grotto end
9455 03 Aug 2018 @ 2044 --- Tara Grotto off.
9431 03 Aug 2018 @ 1321 --- donnielg Grotto off
9428 03 Aug 2018 @ 0950 --- donnielg Off at 9:50
9424 03 Aug 2018 @ 0647 --- Brian Grotto off
9372 01 Aug 2018 @ 1655 --- rbwhitaker Grotto off
9265 21 Jul 2018 @ 1657 --- deanl grotto ended
9205 15 Jul 2018 @ 1913 --- Micah Kipple Grotto is off.
9201 15 Jul 2018 @ 1715 --- hkoenig Grotto ends. D=2h55m
9198 15 Jul 2018 @ 1154 --- deanl ended with last splashes
9183 14 Jul 2018 @ 1434 --- deanl ended - Rocket killed it I guess
9168 13 Jul 2018 @ 0627 --- JimS Ended about 0625.
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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