Last Known Eruption
1d 18h 52m ago

Latest Eruptions

Eruption DurationInterval
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
30 Aug 2019 @ 09152h 14m 2h 25m
30 Aug 2019 @ 0650 ie17h 53m
29 Aug 2019 @ 12574h 20m 5h 1m
29 Aug 2019 @ 07561h 20m 12h 2m
28 Aug 2019 @ 1954 ie wc6h 19m
28 Aug 2019 @ 13353h 10m 5h 12m
28 Aug 2019 @ 08231h 38m 16h 8m
27 Aug 2019 @ 16151h 25m 3h 30m
27 Aug 2019 @ 12451h 40m 5h 57m
27 Aug 2019 @ 0648 ie12h 33m
26 Aug 2019 @ 18151h 4m 3h 54m
26 Aug 2019 @ 14211h 35m 4h 4m
26 Aug 2019 @ 101718h 51m
25 Aug 2019 @ 15263h 7m 8h 42m
25 Aug 2019 @ 0644 ie23h 16m
24 Aug 2019 @ 07289h 37m 14h 28m
23 Aug 2019 @ 17001h 12m 2d 8h 43m
21 Aug 2019 @ 081714h 26m
20 Aug 2019 @ 1751 ie5h 36m
20 Aug 2019 @ 1215 ie13h 5m
19 Aug 2019 @ 2310 ie13h 30m
19 Aug 2019 @ 0940 ns13h 34m
18 Aug 2019 @ 2006 ns12h 27m
18 Aug 2019 @ 0739 ie17h 20m
17 Aug 2019 @ 1419~7h 37m
17 Aug 2019 @ 0642 ie17h 27m
16 Aug 2019 @ 1315 ie21h 25m
15 Aug 2019 @ 1550 ie22h 42m
14 Aug 2019 @ 1708 ie8h 39m
14 Aug 2019 @ 0829 ie11h 3m
13 Aug 2019 @ 2126 ie11h 48m
13 Aug 2019 @ 0938 ie~21h 3m
12 Aug 2019 @ 12354h 11m
12 Aug 2019 @ 082420h 57m
11 Aug 2019 @ 1127 ie15h 17m
10 Aug 2019 @ 2010 ie wc10h 12m
10 Aug 2019 @ 09583h 49m 1d 16m
09 Aug 2019 @ 0942~1d 1h 19m
08 Aug 2019 @ 08231d 31m
07 Aug 2019 @ 0752 ie22h 8m
06 Aug 2019 @ 094419h 4m
05 Aug 2019 @ 14401d 6h 18m
04 Aug 2019 @ 0822 ie1d 15h 27m
02 Aug 2019 @ 1655 ie wc6h 18m
02 Aug 2019 @ 1037 ns1d 1h 4m
01 Aug 2019 @ 0933 ie16h 13m
31 Jul 2019 @ 1720 ie22h 17m
30 Jul 2019 @ 1903 ie23h 35m
29 Jul 2019 @ 1928 ie wc22h 18m
28 Jul 2019 @ 2110 ie10h 34m
28 Jul 2019 @ 103621h 15m
27 Jul 2019 @ 13211d 3h 5m
26 Jul 2019 @ 1016 ie wc21h 27m
25 Jul 2019 @ 1249 ie18h 57m

Interval Statistics

Interval Count100
Min2h 19m
Max6d 5h 46m
Mean21h 19m
Median18h 54m

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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