Last Known Eruption
27m ago

Latest Eruptions

Eruption DurationInterval
17 Jul 2019 @ 1624 ie wc4h 15m
17 Jul 2019 @ 1209 ie16h 21m
16 Jul 2019 @ 1948 ie wc1d 10h 53m
15 Jul 2019 @ 0855 ie11h 30m
14 Jul 2019 @ 2125 ie1d 13h 3m
13 Jul 2019 @ 0822 ie14h 13m
12 Jul 2019 @ 18095h 57m
12 Jul 2019 @ 1212 ie18h 54m
11 Jul 2019 @ 17186h 7m
11 Jul 2019 @ 1111 ie4h 19m
11 Jul 2019 @ 0652 ie wc17h 57m
10 Jul 2019 @ 1255 ie wc1d 23h 2m
08 Jul 2019 @ 1353 wc1d 3h 37m
07 Jul 2019 @ 1016 ie17h 10m
06 Jul 2019 @ 1706 ie6h 15m
06 Jul 2019 @ 105115h 0m
05 Jul 2019 @ 1951 ie12h 36m
05 Jul 2019 @ 0715 ie22h 45m
04 Jul 2019 @ 0830 ie19h 27m
03 Jul 2019 @ 1303 ns wc~5h 1m
03 Jul 2019 @ 0802 ie1h 14m
03 Jul 2019 @ 0648 ie9h 46m
02 Jul 2019 @ 2102 ie6h 32m
02 Jul 2019 @ 1430 ie6h 38m
02 Jul 2019 @ 0752 ie10h 58m
01 Jul 2019 @ 2054 ie1d 3h 37m
30 Jun 2019 @ 1717 ie4h 33m
30 Jun 2019 @ 124417h 44m
29 Jun 2019 @ 1900 ns4h 46m
29 Jun 2019 @ 14143h 32m
29 Jun 2019 @ 1042 ie wc23h 21m
28 Jun 2019 @ 11212h 0m 15h 7m
27 Jun 2019 @ 201413h 59m
27 Jun 2019 @ 0615 ie17h 47m
26 Jun 2019 @ 12283h 55m 1d 5h 36m
25 Jun 2019 @ 065217h 15m
24 Jun 2019 @ 13371d 7h 16m
23 Jun 2019 @ 0621 ie10h 28m
22 Jun 2019 @ 195314h 34m 7h 27m
22 Jun 2019 @ 12262h 15m 5h 55m
22 Jun 2019 @ 0631 ie19h 50m
21 Jun 2019 @ 1041 ie17h 13m
20 Jun 2019 @ 1728 ie1d 9h 13m
19 Jun 2019 @ 0815 ie11h 57m
18 Jun 2019 @ 2018 ie wc1d 8h 46m
17 Jun 2019 @ 11321d 20h 48m
15 Jun 2019 @ 1444 ie wc22h 19m
14 Jun 2019 @ 1625 ie1d 2h 47m
13 Jun 2019 @ 1338 ie4h 42m
13 Jun 2019 @ 08562d 18h 13m
10 Jun 2019 @ 14434h 45m
10 Jun 2019 @ 0958 ? ie21h 28m
09 Jun 2019 @ 1230 ns20h 54m
08 Jun 2019 @ 1536 ns5h 12m
08 Jun 2019 @ 1024 ie1d 19h 12m
06 Jun 2019 @ 1512 ie18h 24m
05 Jun 2019 @ 20488h 28m
05 Jun 2019 @ 1220 ns20h 7m
04 Jun 2019 @ 16131d 4h 43m
03 Jun 2019 @ 1130 ie5h 39m
03 Jun 2019 @ 0551 ie11h 25m
02 Jun 2019 @ 18267h 7m
02 Jun 2019 @ 11192h 33m 15h 59m
01 Jun 2019 @ 19204h 42m
01 Jun 2019 @ 14381h 14m 4h 21m
01 Jun 2019 @ 1017>2h 20m 3h 57m
01 Jun 2019 @ 0620 ie12h 32m
31 May 2019 @ 1748 ie4h 24m
31 May 2019 @ 13244h 42m
31 May 2019 @ 0842 ns12h 30m
30 May 2019 @ 2012 ie wc5h 45m
30 May 2019 @ 14271d 1h 56m
29 May 2019 @ 1230:5415h 54m
28 May 2019 @ 203612h 48m
28 May 2019 @ 0748 ie wc1d 14h 33m
26 May 2019 @ 1715 ie5h 56m
26 May 2019 @ 1119 ie wc17h 35m
25 May 2019 @ 1744 ie1d 1h 57m
24 May 2019 @ 1547 ns wc22h 32m
23 May 2019 @ 1715 ie23h 41m
22 May 2019 @ 17341d 6h 37m
21 May 2019 @ 1057 ie2d 20h 10m
18 May 2019 @ 14472d 19h 51m
15 May 2019 @ 1856 ie wc1d 5h 37m
14 May 2019 @ 131910h 56m
14 May 2019 @ 0223 ? wc10h 22m
13 May 2019 @ 1601 ie wc1d 6h 26m
12 May 2019 @ 0935 ie wc13h 33m
11 May 2019 @ 2002 ie1d 23h 43m
09 May 2019 @ 2019 ie wc10h 17m
09 May 2019 @ 1002 ns19h 54m
08 May 2019 @ 1408 ie2d 3h 24m
06 May 2019 @ 1044 ie21h 31m
05 May 2019 @ 1313 ie wc6h 41m
05 May 2019 @ 0632 ? ie wc21h 0m
04 May 2019 @ 0932 ie22h 0m
03 May 2019 @ 113216h 5m
02 May 2019 @ 1927 ie7h 13m
02 May 2019 @ 1214 ie18h 10m
01 May 2019 @ 1804 ie1d 2h 44m

Interval Statistics

Interval Count100
Min1h 14m
Max2d 20h 10m
Mean18h 43m
Median16h 13m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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 White 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.
9144 11 Jul 2018 @ 2024 --- bhoppe Grotto off
9113 10 Jul 2018 @ 1252 --- bhoppe off at 1252
9006 04 Jul 2018 @ 0910 --- Kyle Grotto Off
9017 03 Jul 2018 @ 1320 --- Tom C. Grotto off.
8897 26 Jun 2018 @ 0611 --- BrianR Turned off
8828 21 Jun 2018 @ 0620 --- JimS Quiet now but Marathon Pool down about 6 inches
8791 19 Jun 2018 @ 1655 --- User34 Shutting off
8728 16 Jun 2018 @ 1735 --- CrisG off after rocket
8719 16 Jun 2018 @ 1250 --- Polly Grotto off by 1250 (after Rocket).
8870 16 Jun 2018 @ 1135 --- Polly Central Vents ie
8695 15 Jun 2018 @ 1507 --- Mkeller End 1502
8692 15 Jun 2018 @ 1044 --- CrisG off. steaming gently
8682 14 Jun 2018 @ 2018 --- Tara Grotto off.
8677 14 Jun 2018 @ 1230 --- Polly Grotto off after Rocket.
8657 13 Jun 2018 @ 1255 --- CrisG eruption has ended. Quietly steaming
8521 07 Jun 2018 @ 1428 --- underarockphoto Off following rocket
8481 06 Jun 2018 @ 1502 --- Polly Grotto off 1502 (after Rocket).
8476 06 Jun 2018 @ 0628 --- JimS Off by 0628 after Rocket.
8464 05 Jun 2018 @ 1600 --- Polly Grotto off shortly after Rocket.
8452 05 Jun 2018 @ 0845 --- JimS Ended about 0845
8451 04 Jun 2018 @ 0815 --- Kitt B Grotto was not in eruption during Giant Hot Period
8375 31 May 2018 @ 1646 --- geysergaze Grotto off
8358 30 May 2018 @ 2023 --- Graham Grotto turned off. Believe this is the end of the 1500 eruption. Spa was full at 1800 but I didn't see it erupting. Bijou was weaker than normal at 1900. Then there was a good hot period at 1956.
8342 29 May 2018 @ 1654 --- Art Grotto off
8340 29 May 2018 @ 1155 --- EricZ grotto off
8226 17 May 2018 @ 2004 --- Tara Grotto off.
8221 17 May 2018 @ 1310 --- BobInSLC Grotto off
EntrySourceLinkComment
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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