Last Known Eruption
10h 18m ago

Latest Eruptions

Eruption DurationInterval
16 Aug 2018 @ 21003h 31m
16 Aug 2018 @ 1729 ie3h 19m
16 Aug 2018 @ 1410 ns2h 54m
16 Aug 2018 @ 111615h 36m
15 Aug 2018 @ 1940 ns5h 28m
15 Aug 2018 @ 1412 ie4h 30m
15 Aug 2018 @ 0942 ns1h 22m
15 Aug 2018 @ 0820 ie16h 6m
14 Aug 2018 @ 1614 ie4h 24m
14 Aug 2018 @ 1150 ie3h 22m
14 Aug 2018 @ 0828 ns14h 58m
13 Aug 2018 @ 1730 ie3h 23m
13 Aug 2018 @ 1407 ie18h 40m
12 Aug 2018 @ 19271h 36m
12 Aug 2018 @ 1751 ns7h 32m
12 Aug 2018 @ 1019~4h21m3h 41m
12 Aug 2018 @ 063842m 12h 1m
11 Aug 2018 @ 1837 ns4h 33m
11 Aug 2018 @ 14044h 20m
11 Aug 2018 @ 09443h 9m
11 Aug 2018 @ 0635 ie4h 42m
11 Aug 2018 @ 01538h 22m
10 Aug 2018 @ 173153m 4h 18m
10 Aug 2018 @ 1313 ns4h 24m
10 Aug 2018 @ 08497h 19m
10 Aug 2018 @ 0130 ns8h 30m
09 Aug 2018 @ 17005h 37m
09 Aug 2018 @ 11234h 24m
09 Aug 2018 @ 065911h 25m
08 Aug 2018 @ 19346h 44m
08 Aug 2018 @ 1250 ie4h 33m
08 Aug 2018 @ 081712h 10m
07 Aug 2018 @ 2007 ie3h 17m
07 Aug 2018 @ 1650 ie6h 32m
07 Aug 2018 @ 1018 ie15h 36m
06 Aug 2018 @ 1842 ie5h 53m
06 Aug 2018 @ 1249 ie4h 7m
06 Aug 2018 @ 0842 ns11h 44m
05 Aug 2018 @ 2058 ie5h 35m
05 Aug 2018 @ 15236h 15m
05 Aug 2018 @ 0908 ie20h 48m
04 Aug 2018 @ 1220 ie16h 46m
03 Aug 2018 @ 19343h 24m
03 Aug 2018 @ 16101h3h 53m
03 Aug 2018 @ 12173h 28m
03 Aug 2018 @ 08499h 4m
02 Aug 2018 @ 234510h 56m
02 Aug 2018 @ 12493h 49m
02 Aug 2018 @ 090057m 3h 29m
02 Aug 2018 @ 05314h 29m
02 Aug 2018 @ 0101:153h 47m
01 Aug 2018 @ 2114 ie2h 7m
01 Aug 2018 @ 1907 ns3h 33m
01 Aug 2018 @ 15341h 21m 4h 19m
01 Aug 2018 @ 11153h 10m
01 Aug 2018 @ 0804:057h 45m
01 Aug 2018 @ 00195h 8m
31 Jul 2018 @ 1910:454h 40m
31 Jul 2018 @ 14304h 14m
31 Jul 2018 @ 1015:071d 36m 34s
30 Jul 2018 @ 0938:3315h 38m 59s
29 Jul 2018 @ 1759:344h 18m 47s
29 Jul 2018 @ 1340:474h 41m 15s
29 Jul 2018 @ 0859:32 ns14h 38m
28 Jul 2018 @ 1821 ie6h 49m
28 Jul 2018 @ 1132 ns3h 21m
28 Jul 2018 @ 081111h 13m
27 Jul 2018 @ 20584h 33m
27 Jul 2018 @ 1624:3018h 36m
26 Jul 2018 @ 2148 ns1d 11h 0m
25 Jul 2018 @ 10484h 41m
25 Jul 2018 @ 0607 ie10h 28m
24 Jul 2018 @ 1939 ns4h 26m
24 Jul 2018 @ 15132h 44m
24 Jul 2018 @ 12294h 17m
24 Jul 2018 @ 0812 ns6h 42m
24 Jul 2018 @ 0130 ns7h 13m
23 Jul 2018 @ 1817 ? ns3h 52m
23 Jul 2018 @ 14254h 33m
23 Jul 2018 @ 09521h 9m 0s 17h 18m
22 Jul 2018 @ 1634 ie5h 43m
22 Jul 2018 @ 1051 ie3h 28m
22 Jul 2018 @ 0723 ie wc7h 48m
21 Jul 2018 @ 2335 ie8h 0m
21 Jul 2018 @ 1535 ns2h 57m
21 Jul 2018 @ 1238 ie53m
21 Jul 2018 @ 1145 ie3h 37m
21 Jul 2018 @ 0808 ie14h 35m
20 Jul 2018 @ 17333h 4m 4h 35m
20 Jul 2018 @ 1257:14 ns2h 34m
20 Jul 2018 @ 1023 ie17h 38m
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

Interval Statistics

Interval Count100
Min53m
Max1d 11h 0m
Mean7h 25m
Median4h 40m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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
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
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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