Last Known Eruption
11d 19h 24m ago

Latest Eruptions

Eruption DurationInterval
04 Nov 2018 @ 0756 ie26m
04 Nov 2018 @ 0730 ie14h 10m
03 Nov 2018 @ 1820 ie3h 10m
03 Nov 2018 @ 1510 ie wc4h 40m
03 Nov 2018 @ 1030 ie23h 26m
02 Nov 2018 @ 1104 ie21h 30m
01 Nov 2018 @ 1334 ie2d 21h 32m
29 Oct 2018 @ 1602 ie wc1d 6h 58m
28 Oct 2018 @ 0904 ie wc19h 24m
27 Oct 2018 @ 1340 ie wc5h 49m
27 Oct 2018 @ 0751 ie wc5d 21h 44m
21 Oct 2018 @ 1007 ie1d 20h 46m
19 Oct 2018 @ 132157m 2d 18h 15m
16 Oct 2018 @ 19067h 51m
16 Oct 2018 @ 1115 ns1d 2h 49m
15 Oct 2018 @ 0826 ie23h 38m
14 Oct 2018 @ 0848 ie wc19h 51m
13 Oct 2018 @ 1257 ie18h 46m
12 Oct 2018 @ 1811 ie wc1h 53m
12 Oct 2018 @ 1618 ns1d 2h 43m
11 Oct 2018 @ 1334:34 ie2h 24m
11 Oct 2018 @ 1110 ie19h 33m
10 Oct 2018 @ 1536:50 ns3h 37m
10 Oct 2018 @ 115922h 5m
09 Oct 2018 @ 1353:015h 25m 3s
09 Oct 2018 @ 0827:58 ns19h 35m
08 Oct 2018 @ 1252 ie3h 50m
08 Oct 2018 @ 0902 ns15h 53m
07 Oct 2018 @ 1709 ie5h 4m
07 Oct 2018 @ 1205 ie4h 6m
07 Oct 2018 @ 0759 ie wc15h 49m
06 Oct 2018 @ 16101h 45m
06 Oct 2018 @ 1425 ns wc6h 23m
06 Oct 2018 @ 0802 ie wc14h 27m
05 Oct 2018 @ 1735 ie3h 45m
05 Oct 2018 @ 1350~44m 3h 43m
05 Oct 2018 @ 100721h 50m
04 Oct 2018 @ 12175h 38m
04 Oct 2018 @ 0639 ie11h 16m
03 Oct 2018 @ 19235h 26m
03 Oct 2018 @ 13574h 57m
03 Oct 2018 @ 0900 ie3h 35m
03 Oct 2018 @ 0525 ie9h 4m
02 Oct 2018 @ 202141m 7h 25m
02 Oct 2018 @ 1256 ie1h 46m
02 Oct 2018 @ 1110 ie2h 43m
02 Oct 2018 @ 0827 ns19h 38m
01 Oct 2018 @ 124959m 3h 59m
01 Oct 2018 @ 0850 A17h 10m
30 Sep 2018 @ 15404h 3m
30 Sep 2018 @ 1137 ns3h 50m
30 Sep 2018 @ 0747 ie12h 51m
29 Sep 2018 @ 1856 ie4h 24m
29 Sep 2018 @ 1432 ie6h 59m
29 Sep 2018 @ 0733 ie12h 51m
28 Sep 2018 @ 18421h 14m2h 44m
28 Sep 2018 @ 15583h 54m
28 Sep 2018 @ 1204~1h01m6h 27m
28 Sep 2018 @ 05379h 37m
27 Sep 2018 @ 20003h 36m
27 Sep 2018 @ 1624 ie2h 15m
27 Sep 2018 @ 14095h 12m 5h 4m
27 Sep 2018 @ 0905 ie3h 16m
27 Sep 2018 @ 0549 ie13h 32m
26 Sep 2018 @ 1617 ns4h 1m
26 Sep 2018 @ 1216 ie2h 57m
26 Sep 2018 @ 0919 ns~55m 3h 44m
26 Sep 2018 @ 0535 ie11h 16m
25 Sep 2018 @ 1819 ns~ 54 m3h 8m
25 Sep 2018 @ 1511 ns3h 28m
25 Sep 2018 @ 11434h 4m
25 Sep 2018 @ 07392h 42m
25 Sep 2018 @ 0457 ie10h 57m
24 Sep 2018 @ 1800 ie1h 4m
24 Sep 2018 @ 16563h 33m
24 Sep 2018 @ 132319h 29m
23 Sep 2018 @ 1754 ie21h 39m
22 Sep 2018 @ 20151h 2m 3h 50m
22 Sep 2018 @ 1625 ie22h 36m
21 Sep 2018 @ 1749 ie4h 43m
21 Sep 2018 @ 13061h 33m 3h 36m
21 Sep 2018 @ 093014h 31m
20 Sep 2018 @ 1859 ns3h 28m
20 Sep 2018 @ 15311h 23m 1d 1h 24m
19 Sep 2018 @ 1407 ie4h 1m
19 Sep 2018 @ 1006 ie18h 45m
18 Sep 2018 @ 1521 ie20h 21m
17 Sep 2018 @ 1900 ie4h 28m
17 Sep 2018 @ 1432 ie19h 32m
16 Sep 2018 @ 1900 ie6h 20m
16 Sep 2018 @ 1240 ie4h 40m
16 Sep 2018 @ 0800 ie3h 4m
16 Sep 2018 @ 0456 ie10h 35m
15 Sep 2018 @ 1821 ns3h 42m
15 Sep 2018 @ 14393h 37m
15 Sep 2018 @ 11021 hr 4 m3h 19m
15 Sep 2018 @ 0743 ns9h 46m
14 Sep 2018 @ 2157 ie1h 50m
14 Sep 2018 @ 2007 ie4h 36m
14 Sep 2018 @ 153154m 6h 54m

Interval Statistics

Interval Count100
Min26m
Max5d 21h 44m
Mean12h 14m
Median5h 32m

Latest Notes

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