Last Known Eruption
13h 47m ago

Latest Eruptions

Eruption DurationInterval
19 Jul 2018 @ 1645 ie4h 35m
19 Jul 2018 @ 1210 ie16h 6m
18 Jul 2018 @ 2004 ie11h 2m
18 Jul 2018 @ 090212h 16m
17 Jul 2018 @ 2045:555h 7m 30s
17 Jul 2018 @ 1538:253h 54m
17 Jul 2018 @ 1144 ie3h 59m
17 Jul 2018 @ 07456h 47m
17 Jul 2018 @ 0057:04 ie3h 4m
16 Jul 2018 @ 2153 ie7h 57m
16 Jul 2018 @ 1356 ie5h 13m
16 Jul 2018 @ 084314h 22m
15 Jul 2018 @ 1821 ie4h 1m
15 Jul 2018 @ 14203h 31m
15 Jul 2018 @ 10494h 29m
15 Jul 2018 @ 0620 ie3h 59m
15 Jul 2018 @ 02217h 54m
14 Jul 2018 @ 18275h 18m
14 Jul 2018 @ 13094h 58m
14 Jul 2018 @ 0811 ns2h 50m
14 Jul 2018 @ 052110h 6m
13 Jul 2018 @ 19154h 42m
13 Jul 2018 @ 1433 ns5h 5m
13 Jul 2018 @ 09281h 31m 3h 56m
13 Jul 2018 @ 0532 ns9h 49m
12 Jul 2018 @ 19434h 59m
12 Jul 2018 @ 14444h 53m
12 Jul 2018 @ 0951 ns4h 5m
12 Jul 2018 @ 0546 ie10h 46m
11 Jul 2018 @ 1900 ie6h 46m
11 Jul 2018 @ 12141h 30m 3h 38m
11 Jul 2018 @ 0836 ns16h 8m
10 Jul 2018 @ 16285h 33m
10 Jul 2018 @ 10555h 25m
10 Jul 2018 @ 0530 ie8h 9m
09 Jul 2018 @ 2121 ie4h 55m
09 Jul 2018 @ 1626 ie3h 40m
09 Jul 2018 @ 1246 ie3h 27m
09 Jul 2018 @ 0918:27 ns52m 0s 3h 18m
09 Jul 2018 @ 0600 ie12h 0m
08 Jul 2018 @ 18004h 36m
08 Jul 2018 @ 13245h 0m
08 Jul 2018 @ 0824 ie3h 0m
08 Jul 2018 @ 0524 ie9h 34m
07 Jul 2018 @ 1950 ns5h 18m
07 Jul 2018 @ 143253m 4h 33m
07 Jul 2018 @ 095928m 4h 7m
07 Jul 2018 @ 0552 ie18h 43m
06 Jul 2018 @ 11094h 51m
06 Jul 2018 @ 0618 ns15h 15m
05 Jul 2018 @ 15032h 32m
05 Jul 2018 @ 12311h 24m 4h 14m
05 Jul 2018 @ 08171h 25m 4h 19m
05 Jul 2018 @ 0358 ie4h 6m
04 Jul 2018 @ 23524h 47m
04 Jul 2018 @ 19051h24 m3h 56m
04 Jul 2018 @ 15091h 1m 3h 37m
04 Jul 2018 @ 11323h 33m
04 Jul 2018 @ 07593h 4m
04 Jul 2018 @ 0455 ie7h 55m
03 Jul 2018 @ 2100 ie4h 23m
03 Jul 2018 @ 16374h 41m
03 Jul 2018 @ 11565h 1m
03 Jul 2018 @ 06553h 4m 14h 58m
02 Jul 2018 @ 155755m 4h 29m
02 Jul 2018 @ 112817h 47m
01 Jul 2018 @ 17411h 4m 4h 39m
01 Jul 2018 @ 13026h 23m
01 Jul 2018 @ 063912h 23m
30 Jun 2018 @ 18165h 12m
30 Jun 2018 @ 13043h 34m
30 Jun 2018 @ 09303h 25m
30 Jun 2018 @ 0605 ie11h 27m
29 Jun 2018 @ 18385h 26m
29 Jun 2018 @ 13121h 8m 4h 4m
29 Jun 2018 @ 090814h 2m
28 Jun 2018 @ 19064h 16m
28 Jun 2018 @ 14501h 3m 1h 45m
28 Jun 2018 @ 130542m 2h 1m
28 Jun 2018 @ 110455m 1h 44m
28 Jun 2018 @ 092042 miin1h 32m
28 Jun 2018 @ 074839m 1h 38m
28 Jun 2018 @ 0610 ie13h 1m
27 Jun 2018 @ 170955m 4h 36m
27 Jun 2018 @ 12331h 33m 3h 28m
27 Jun 2018 @ 090558m 15h 35m
26 Jun 2018 @ 17301015h 12m
26 Jun 2018 @ 12182h 8m 3h 48m
26 Jun 2018 @ 083046m 2h 58m
26 Jun 2018 @ 0532 ie13h 29m
25 Jun 2018 @ 16031h 26m 5h 55m
25 Jun 2018 @ 100888. Min3h 58m
25 Jun 2018 @ 06101h 0m 14h 41m
24 Jun 2018 @ 15292h 30m 6h 8m
24 Jun 2018 @ 09211h 40m 17h 33m
23 Jun 2018 @ 15481h 57m 5h 39m
23 Jun 2018 @ 10092h 51m 3h 55m
23 Jun 2018 @ 0614 ie15h 23m
22 Jun 2018 @ 14515h 15m
22 Jun 2018 @ 093618h 26m

Interval Statistics

Interval Count100
Min1h 32m
Max18h 43m
Mean6h 44m
Median4h 54m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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
8208 15 May 2018 @ 1807 --- Polly Grotto appears to be off (from Castle).
8215 15 May 2018 @ 1524 --- Tom C. FWIW, Grotto had three false starts (rocket splashing to ~6', water 4'-10' above Grotto, and just enough water out the back to make an experienced observer get a radio out and check the time - one was erroneously called) between the 1146 end and 1608 start. One at 1316, one circa 1440, and one at 1514. I also saw one sometime prior to the 1324 eruption on the 14th.
8202 15 May 2018 @ 1146 --- bbev off at 1146
8151 10 May 2018 @ 1945 --- Bijoumonkey Grotto off ~1945 per Tara
8123 08 May 2018 @ 1820 --- Bijoumonkey Grotto end ~1820
8079 05 May 2018 @ 1404 --- sfavor off/calm at the moment
8052 02 May 2018 @ 0915 --- WillBoekel recently turned off. little bit of water trickling down runoff channel
8050 01 May 2018 @ 1026 --- Micah Kipple Rocket did not shut grotto down. Still in marathon.
8029 28 Apr 2018 @ 0755 --- Micah Kipple Grotto off
7993 23 Apr 2018 @ 0652 --- RMichaels Quiet, water down a few inches in marathon pool.
7984 21 Apr 2018 @ 1347 --- DanS Still erupting 1250 Off 1330.
7872 15 Jan 2018 @ 0217 --- JoeN something very large to the right of grand in Giant area too large for grotto I think
7746 24 Oct 2017 @ 1643 --- DanS Still off 1643
7538 29 Sep 2017 @ 1153 --- Polly Off before 1153. Strong and lengthy Rocket at start.
7535 29 Sep 2017 @ 0905 --- Kitt B not erupting
7046 23 Sep 2017 @ 1512 23 Sep 2017 @ 1520 Polly Central Vents delay.
7045 23 Sep 2017 @ 1404 23 Sep 2017 @ 1420 Polly Central Vents delay. (Grotto made a strong attempt but did not start.)
6852 19 Sep 2017 @ 1138 19 Sep 2017 @ 1246 Polly At 1238, Grotto appeared to be ie from the Inn parking lot. At 1228ie I saw heavy steam while watching Grand. Grotto was already off when I approached - noises like it just shut down and steam in the runoff channel
6285 11 Sep 2017 @ 1610 --- Kitt B Grotto ended at 1747.
5958 08 Sep 2017 @ 1445 --- B**2 Rocket tried, but both shut down.
5905 08 Sep 2017 @ 0930 --- c.barwin Off, some steam.
5566 01 Sep 2017 @ 1620 --- LotusBaker no rocket grotto off
5562 31 Aug 2017 @ 2055 --- Tara No Grotto yet.
5549 31 Aug 2017 @ 1708 --- LotusBaker grotto off
5519 31 Aug 2017 @ 1259 --- Kitt B Grotto ended.
5513 30 Aug 2017 @ 1802 --- LotusBaker Grotto off
5185 21 Aug 2017 @ 0752 --- c.barwin dry and definitely off.
5328 19 Aug 2017 @ 1416 19 Aug 2017 @ 1429 Tara False start with Central Vents, duration ~13m. Sloshed around and put water out the back but never really got going.
5011 18 Aug 2017 @ 1730 --- nails Off at 1719
4980 18 Aug 2017 @ 1304 --- Brian Grotto quiet by 1258
4865 09 Aug 2017 @ 1045 --- Tara Central Vents active and sloshing in Grotto, probably started shortly after this.
4822 07 Aug 2017 @ 1624 --- udo Ended at 1624
4819 07 Aug 2017 @ 0748 --- c.barwin off by 0748
4871 02 Aug 2017 @ 2115 --- Tara Quiet, no eruption yet.
4567 28 Jul 2017 @ 1700 --- Archer Not in eruption.
4557 27 Jul 2017 @ 1725 --- donnielg Off at 17:25
4466 15 Jul 2017 @ 0840 --- Archer Not erupting.
4459 14 Jul 2017 @ 1345 --- Archer Still erupting at 1245 on my way down to F&M; not erupting at 1345.
4346 21 Jun 2017 @ 1220 --- Polly Grotto shut off at 1220 per Janet and Barbara.
4334 18 Jun 2017 @ 1838 --- WillBoekel turned off.
4324 15 Jun 2017 @ 1450 --- Polly Steam from Grotto (seen from F&M) but not positive it had started at this time or a bit later. Was seen ie before 1545 and was off before 1645.
4318 15 Jun 2017 @ 0650 --- B**2 Just finished a shutdown.
4244 06 Jun 2017 @ 2000 --- Archer Grotto had a marathon today - around this time Bijou was still off but sputtering. Marathon Pool was down a few inches and unsettled. There is a morning start time for Grotto today and also an ie time just a few hours later - was this possibly the same eruption?
4092 13 May 2017 @ 0605 --- JimS Marathon over sometime before 0605. Marathon pool down about 18 inches.
3869 06 Nov 2016 @ 1253 --- WillBoekel turned off.
3767 30 Sep 2016 @ 1635 --- bhoppe eruption end at 1635
3694 20 Sep 2016 @ 1105 --- LotusBaker Grotto is ie for awhile by splashing
3656 13 Sep 2016 @ 1634 --- LotusBaker stopped at 1634
3674 09 Sep 2016 @ 1155 --- bhoppe eruption end at 1155
3425 05 Aug 2016 @ 1827 --- bhoppe Eruption end at 1827.
3293 12 Jul 2016 @ 0932 --- cb OFF @ 0932
3201 04 Jul 2016 @ 0802 --- User34 Off, but rumbling loudly and water still running in runoff channels
3043 10 Jun 2016 @ 1942 --- bhoppe Eruption ended. Last water at 1942
3004 07 Jun 2016 @ 1151 --- Barbara Lasseter eruption ended
2970 05 Jun 2016 @ 0755 --- EmilyW Off by 0755
2948 02 Jun 2016 @ 1533 --- BobInSLC still ie
2859 20 May 2016 @ 1531 --- Jake no longer erupting. no steam visible on webcam. possible end time could've been anywhere in the last 3 hours
2742 16 Apr 2016 @ 1458 --- Siegmund Central Vents started 1458, killed Grotto Fountain and caused a textbook 40-minute delay.
2651 17 Jan 2016 @ 1234 --- Graham Central vents started , d=8m
2554 16 Oct 2015 @ 1156 16 Oct 2015 @ 1220 User34 Shut off sometime between 1200 and 1220
2473 04 Oct 2015 @ 1000 --- WillBoekel appears to be off from castle.
2468 03 Oct 2015 @ 2015 --- Archer Grotto had not yet restarted at this time.
2462 03 Oct 2015 @ 0815 --- JimS Quiet. Marathon over.
2452 01 Oct 2015 @ 1300 --- JimS The Grotto this morning did not lead to a marathon.
2447 30 Sep 2015 @ 1725 --- Jake Grotto finished erupting about 1725. Possible 18hr+ eruption, Grotto and Spa were ie at 0600
2349 14 Sep 2015 @ 1525 --- bhoppe Grotto off upon passing. Marathon ended between 1215 and 1525.
2350 14 Sep 2015 @ 1441 --- decooper Waited at Grotto until 1305 for the 24 hour marathon mark. When I biked by at 1441 it was off.
2343 14 Sep 2015 @ 0700 --- bhoppe Still in marathon from yesterday 1302 eruption
EntrySourceLinkComment
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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