Last Known Eruption
4h 35m ago

Latest Eruptions

Eruption DurationInterval
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
09 May 2018 @ 07301h 27m
09 May 2018 @ 0603 ie12h 29m
08 May 2018 @ 17345h 16m
08 May 2018 @ 1218 ie4h 13m
08 May 2018 @ 080512h 59m
07 May 2018 @ 1906 ie10h 23m
07 May 2018 @ 0843 ie15h 28m
06 May 2018 @ 1715 ie5h 1m
06 May 2018 @ 1214 ns4h 47m
06 May 2018 @ 072714h 16m
05 May 2018 @ 1711 ns9h 14m
05 May 2018 @ 075713h 27m
04 May 2018 @ 1830 ie1h 12m
04 May 2018 @ 17184h 31m
04 May 2018 @ 1247 ie3h 29m
04 May 2018 @ 0918 ie16h 25m
03 May 2018 @ 16535h 26m
03 May 2018 @ 112717h 41m
02 May 2018 @ 17464h 51m
02 May 2018 @ 1255 ie18h 54m
01 May 2018 @ 18019h 19m
01 May 2018 @ 0842 ie1d 9h 28m
29 Apr 2018 @ 2314 ns6h 34m
29 Apr 2018 @ 1640 ie1h 35m
29 Apr 2018 @ 15057h 51m
29 Apr 2018 @ 0714 ns wc15h 5m
28 Apr 2018 @ 16094h 48m
28 Apr 2018 @ 112158m 2h 42m
28 Apr 2018 @ 0839~50m 1h 44m
28 Apr 2018 @ 0655 ns8h 57m
27 Apr 2018 @ 21587h 25m
27 Apr 2018 @ 1433 ns6h 0m
27 Apr 2018 @ 0833 ie16h 27m
26 Apr 2018 @ 160654m 1d 2h 17m
25 Apr 2018 @ 1349 ie18h 6m
24 Apr 2018 @ 1943 ns4h 45m
24 Apr 2018 @ 14581d 2h 39m
23 Apr 2018 @ 12194h 6m
23 Apr 2018 @ 081352m 14h 25m
22 Apr 2018 @ 17486h 4m
22 Apr 2018 @ 11444h 29m
22 Apr 2018 @ 0715 ie13h 18m
21 Apr 2018 @ 17576h 38m
21 Apr 2018 @ 1119 ie20h 41m
20 Apr 2018 @ 14383h 49m
20 Apr 2018 @ 104920h 36m
19 Apr 2018 @ 1413 ie20h 21m
18 Apr 2018 @ 17524d 2h 21m
14 Apr 2018 @ 15315d 1h 35m
09 Apr 2018 @ 1356 ie45d 19h 35m
22 Feb 2018 @ 1721 ie wc3d 7h 53m
19 Feb 2018 @ 0928 ie21h 48m
18 Feb 2018 @ 1140 ns23h 56m
17 Feb 2018 @ 1144 ie1d 31m
16 Feb 2018 @ 1113~1h 35m 12d 23h 26m

Interval Statistics

Interval Count100
Min1h 12m
Max45d 19h 35m
Mean1d 2h 39m
Median7h 38m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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
1002 22 Aug 2008 @ 0000 22 Aug 2008 @ 2359 BoekelUpload marathon
992 06 Aug 2008 @ 0620 --- BoekelUpload not ie 06:20
990 04 Aug 2008 @ 0530 --- BoekelUpload not ie 05:30
985 26 Jul 2008 @ 0530 --- BoekelUpload off @ 5:30
954 28 Apr 2008 @ 1830 --- BoekelUpload off at 18:30
945 04 Mar 2008 @ 0930 --- BoekelUpload off at 9:30
942 28 Feb 2008 @ 0930 --- BoekelUpload off at 09:30
939 12 Feb 2008 @ 0930 --- BoekelUpload off @ 09:30
934 05 Feb 2008 @ 0940 --- BoekelUpload off at 09:40
930 31 Jan 2008 @ 0930 31 Jan 2008 @ 1000 BoekelUpload off at 09:30 and 10:00
924 24 Jan 2008 @ 0902 --- BoekelUpload off at 09:02
918 09 Jan 2008 @ 0855 --- BoekelUpload off at 08:55
917 08 Jan 2008 @ 0800 --- BoekelUpload off @ 08:00 vr
916 05 Jan 2008 @ 1030 --- BoekelUpload on 10:30 vr
915 05 Jan 2008 @ 0925 --- BoekelUpload off at 09:25
1351 14 Oct 2007 @ 0800 14 Oct 2007 @ 1435 BoekelUpload in marathon 08:00ie; off 14:35
1350 21 Sep 2007 @ 0100 21 Sep 2007 @ 0600 BoekelUpload still on @ 01:00; off before 06:00
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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