Last Known Eruption
6h 40m ago

Latest Eruptions

Eruption DurationInterval
17 Jun 2018 @ 1501 ns4h 36m
17 Jun 2018 @ 1025 nsabout 1.5 hours18h 13m
16 Jun 2018 @ 16124h 11m
16 Jun 2018 @ 12012h 57m
16 Jun 2018 @ 090414h 33m
15 Jun 2018 @ 18311 hour4h 54m
15 Jun 2018 @ 1337 ie3h 43m
15 Jun 2018 @ 0954 ie3h 51m
15 Jun 2018 @ 0603 ie11h 40m
14 Jun 2018 @ 1823 ie3h 40m
14 Jun 2018 @ 1443 ns~ 1 hour.3h 3m
14 Jun 2018 @ 1140 ie3h 40m
14 Jun 2018 @ 080012h 56m
13 Jun 2018 @ 1904 ie3h 46m
13 Jun 2018 @ 1518 ie4h 9m
13 Jun 2018 @ 11093h 31m
13 Jun 2018 @ 0738 ie20h 48m
12 Jun 2018 @ 1050 ie4h 35m
12 Jun 2018 @ 0615 ie18h 16m
11 Jun 2018 @ 1159 ie1d 22h 3m
09 Jun 2018 @ 13563h 20m
09 Jun 2018 @ 10364h 59m
09 Jun 2018 @ 0537 ie9h 34m
08 Jun 2018 @ 2003 ns5h 8m
08 Jun 2018 @ 14554h 14m
08 Jun 2018 @ 10412h 8m4h 16m
08 Jun 2018 @ 0625 ie13h 15m
07 Jun 2018 @ 17103h 30m
07 Jun 2018 @ 1340 ns4h 19m
07 Jun 2018 @ 09213h 34m
07 Jun 2018 @ 0547 ie10h 11m
06 Jun 2018 @ 19365h 51m
06 Jun 2018 @ 1345 ie5h 7m
06 Jun 2018 @ 083813h 7m
05 Jun 2018 @ 19314h 20m
05 Jun 2018 @ 15113h 44m
05 Jun 2018 @ 1127 ie15h 20m
04 Jun 2018 @ 2007 ns6h 27m
04 Jun 2018 @ 1340 ie1d 22h 36m
02 Jun 2018 @ 1504~1h40m5h 6m
02 Jun 2018 @ 0958<56m 3h 11m
02 Jun 2018 @ 064713h 2m
01 Jun 2018 @ 174522h 31m
31 May 2018 @ 1914 ie4h 38m
31 May 2018 @ 1436 ns~2h10m5h 23m
31 May 2018 @ 0913 ns4h 27m
31 May 2018 @ 0446 ie13h 46m
30 May 2018 @ 1500 ie5h 38m
30 May 2018 @ 0922 ie3h 50m
30 May 2018 @ 0532 ie9h 49m
29 May 2018 @ 1943 ns4h 45m
29 May 2018 @ 1458 ns4h 55m
29 May 2018 @ 1003 ie23h 55m
28 May 2018 @ 1008 ie18h 0m
27 May 2018 @ 16082d 2h 6m
25 May 2018 @ 14025h 42m
25 May 2018 @ 082015h 25m
24 May 2018 @ 1655 ns10h 55m
24 May 2018 @ 0600 ie22h 44m
23 May 2018 @ 0716 ie10h 50m
22 May 2018 @ 20269h 9m
22 May 2018 @ 11175h 8m
22 May 2018 @ 0609 ie13h 13m
21 May 2018 @ 1656 ns6h 12m
21 May 2018 @ 1044 ie4h 11m
21 May 2018 @ 0633 ns15h 14m
20 May 2018 @ 1519 ns1:41:005h 5m
20 May 2018 @ 10144h 11m
20 May 2018 @ 0603 ie17h 21m
19 May 2018 @ 1242 ie4h 35m
19 May 2018 @ 08071h 0m 13h 54m
18 May 2018 @ 1813 ns6h 9m
18 May 2018 @ 1204 ie4h 49m
18 May 2018 @ 071512h 25m
17 May 2018 @ 1850 ie7h 21m
17 May 2018 @ 1129 ie3h 47m
17 May 2018 @ 074216h 15m
16 May 2018 @ 15274h 31m
16 May 2018 @ 1056 ie18h 48m
15 May 2018 @ 16086h 22m
15 May 2018 @ 0946 ie4h 21m
15 May 2018 @ 0525 ie16h 1m
14 May 2018 @ 13244h 16m
14 May 2018 @ 0908 ie3h 31m
14 May 2018 @ 0537 ie15h 34m
13 May 2018 @ 14032h 21m4h 14m
13 May 2018 @ 09494h 12m
13 May 2018 @ 0537 ie14h 51m
12 May 2018 @ 1446 ns5h 13m
12 May 2018 @ 0933 ie1h 42m4h 2m
12 May 2018 @ 0531 ie11h 50m
11 May 2018 @ 1741~1h25m5h 2m
11 May 2018 @ 1239 ie4h 50m
11 May 2018 @ 074919h 0m
10 May 2018 @ 12495h 42m
10 May 2018 @ 07071h 33m 11h 57m
09 May 2018 @ 1910 ie3h 51m
09 May 2018 @ 1519 ie3h 58m
09 May 2018 @ 1121 ie2h 0m
09 May 2018 @ 0921 ie1h 51m

Interval Statistics

Interval Count100
Min1h 51m
Max2d 2h 6m
Mean9h 26m
Median5h 8m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
8728 16 Jun 2018 @ 1735 --- CrisG off after rocket
8719 16 Jun 2018 @ 1250 --- Polly Grotto off by 1250 (after Rocket).
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
2272 06 Sep 2015 @ 0720 --- Jake had a marathon overnight. Spa is wet. Bijou off.
2149 14 Aug 2015 @ 1231 --- JSJ Already off at 1231.
1943 20 Jul 2015 @ 1325 --- SteveO 2 big splashes out the back, Grotto, & Rocket sloshed around a bit with the Central vents going. Then stop after 3 or 4 minutes.
1648 26 May 2015 @ 1900 --- Archer Central Vents in play.
828 12 Jun 2013 @ 2225 12 Jun 2013 @ 2345 Micah Kipple large cloud of steam hanging above grotto and Giant area most of the time I was at Grand 2225-2345
384 13 Aug 2012 @ 1212 --- rbwhitaker Still ie at 12:12
366 24 Jul 2012 @ 0000 24 Jul 2012 @ 2359 Graham In marathon since about midnight
369 24 Jul 2012 @ 2200 --- Graham Marathon ended approx 2200-2300
195 29 Apr 2012 @ 1327 --- WillBoekel Grotto was off at 1327
640 31 Jan 2011 @ 0000 31 Jan 2011 @ 2359 BoekelUpload marathon ?
1028 17 Oct 2008 @ 0900 --- BoekelUpload end ~09:00
1015 12 Sep 2008 @ 1710 13 Sep 2008 @ 1300 BoekelUpload started marathon 17:10 9/12 still ie 13:00 9/13
1007 05 Sep 2008 @ 0700 --- BoekelUpload marathon overnight; off @ 07:00
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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