Last Known Eruption
1d 10h 26m ago

Latest Eruptions

EruptionDurationInterval
19 Oct 2017 @ 1225 ie3h 45m
19 Oct 2017 @ 0840 ie17h 50m
18 Oct 2017 @ 1450 ie1d 4h 4m
17 Oct 2017 @ 10461d 23h 37m
15 Oct 2017 @ 1109 ie1d 16h 47m
13 Oct 2017 @ 1822 ie wc1d 9h 32m
12 Oct 2017 @ 0850 ie23h 43m
11 Oct 2017 @ 0907 ie6d 14m
05 Oct 2017 @ 0853 ie23h 24m
04 Oct 2017 @ 0929~3 hours15h 29m
03 Oct 2017 @ 1800 ie5h 16m
03 Oct 2017 @ 1244 ie1d 1h 14m
02 Oct 2017 @ 1130 ie18h 13m
01 Oct 2017 @ 1717 ie5h 58m
01 Oct 2017 @ 1119 ie20h 19m
30 Sep 2017 @ 1500 ie1h 55m
30 Sep 2017 @ 130542m 21h 35m
29 Sep 2017 @ 15304h 8m
29 Sep 2017 @ 1122 ns3h 20m
29 Sep 2017 @ 0802ended before 090514h 55m
28 Sep 2017 @ 17074h 52m
28 Sep 2017 @ 1215 ie23h 38m
27 Sep 2017 @ 123718h 44m
26 Sep 2017 @ 1753 ie5h 56m
26 Sep 2017 @ 1157 ns4h 2m
26 Sep 2017 @ 0755 ie16h 3m
25 Sep 2017 @ 15524h 11m
25 Sep 2017 @ 1141 ie4h 36m
25 Sep 2017 @ 0705 ie14h 1m
24 Sep 2017 @ 1704 ns5h 11m
24 Sep 2017 @ 1153 ns19h 51m
23 Sep 2017 @ 160222h 49m
22 Sep 2017 @ 1713 ns4h 0m
22 Sep 2017 @ 1313 ie1d 8m
21 Sep 2017 @ 1305 ie20h 42m
20 Sep 2017 @ 1623 ie6h 36m
20 Sep 2017 @ 0947 ns1d 19h 58m
18 Sep 2017 @ 1349 ie6h 16m
18 Sep 2017 @ 0733 ie14h 3m
17 Sep 2017 @ 1730 ie4h 7m
17 Sep 2017 @ 1323 ie21h 34m
16 Sep 2017 @ 1549 ie4h 20m
16 Sep 2017 @ 1129 ie5h 19m
16 Sep 2017 @ 0610 ie14h 54m
15 Sep 2017 @ 15161 h 34 m3h 48m
15 Sep 2017 @ 1128 ie4h 29m
15 Sep 2017 @ 065920h 32m
14 Sep 2017 @ 1027 ns wc5h 37m
14 Sep 2017 @ 0450 ie13h 39m
13 Sep 2017 @ 15116h 11m
13 Sep 2017 @ 0900 ie4h 56m
13 Sep 2017 @ 0404 ie11h 2m
12 Sep 2017 @ 1702 ie6h 38m
12 Sep 2017 @ 10244h 21m
12 Sep 2017 @ 0603~1h15m13h 53m
11 Sep 2017 @ 16105h 48m
11 Sep 2017 @ 1022 ns4h 47m
11 Sep 2017 @ 0535 ie10h 30m
10 Sep 2017 @ 1905 ie6h 7m
10 Sep 2017 @ 1258 ie5h 46m
10 Sep 2017 @ 0712 ie14h 17m
09 Sep 2017 @ 1655 ns4h 36m
09 Sep 2017 @ 1219 ie4h 49m
09 Sep 2017 @ 0730 ie14h 1m
08 Sep 2017 @ 1729 ie5h 43m
08 Sep 2017 @ 1146 ns5h 5m
08 Sep 2017 @ 0641 ie14h 14m
07 Sep 2017 @ 16277h 21m
07 Sep 2017 @ 0906 ie21h 18m
06 Sep 2017 @ 1148 ns3h 1m
06 Sep 2017 @ 0847 ie3h 21m
06 Sep 2017 @ 0526 ie12h 45m
05 Sep 2017 @ 1641 ns5h 14m
05 Sep 2017 @ 11272h 19m4h 50m
05 Sep 2017 @ 0637 ie15h 2m
04 Sep 2017 @ 15353h 41m
04 Sep 2017 @ 1154 ie4h 24m
04 Sep 2017 @ 0730 ns10h 55m
03 Sep 2017 @ 2035 ie6h 5m
03 Sep 2017 @ 14302h 20m 5h 52m
03 Sep 2017 @ 0838 ie18h 26m
02 Sep 2017 @ 14123h 31m 4h 10m
02 Sep 2017 @ 100219h 52m
01 Sep 2017 @ 14105h 15m
01 Sep 2017 @ 0855 ie17h 47m
31 Aug 2017 @ 1508 ie4h 27m
31 Aug 2017 @ 104117h 34m
30 Aug 2017 @ 1707 ie4h 47m
30 Aug 2017 @ 12204h 27m
30 Aug 2017 @ 075317h 23m
29 Aug 2017 @ 14305h 15m
29 Aug 2017 @ 091515h 47m
28 Aug 2017 @ 17286h 9m
28 Aug 2017 @ 11194h 30m
28 Aug 2017 @ 0649 ie11h 4m
27 Aug 2017 @ 19455h 37m
27 Aug 2017 @ 14087h 13m
27 Aug 2017 @ 0655 ie16h 17m
26 Aug 2017 @ 14384h 32m
26 Aug 2017 @ 100620h 37m

Interval Statistics

Interval Count100
Min1h 55m
Max6d 14m
Mean13h 11m
Median6h 37m

Latest Notes

Note IDStart TimeEnd TimeEntrantNote
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 --- AndrewW 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
1349 19 Sep 2007 @ 1040 --- BoekelUpload off @ 10:40
1348 15 Sep 2007 @ 0600 --- BoekelUpload off by 6:00
1347 14 Sep 2007 @ 0600 --- BoekelUpload not ie 06:00
1346 12 Sep 2007 @ 1200 --- BoekelUpload marathon end ~ 12:00
1345 08 Sep 2007 @ 0702 08 Sep 2007 @ 0745 BoekelUpload still ie 07:02; off by 7:45
1344 07 Sep 2007 @ 0600 --- BoekelUpload off before 06:00
1343 05 Sep 2007 @ 0743 --- BoekelUpload marathon; end 7:43 d=~17h
1342 01 Sep 2007 @ 0000 01 Sep 2007 @ 2359 BoekelUpload marathon
1341 24 Aug 2007 @ 0500 24 Aug 2007 @ 0530 BoekelUpload end marathon ~ 05:00 - 05:30
1340 14 Aug 2007 @ 0600 --- BoekelUpload off before 06:00
1339 06 Aug 2007 @ 0645 --- BoekelUpload end marathon ~ 06:45
1338 27 Jul 2007 @ 2016 --- BoekelUpload ~ 27 hour marathon ended 20:16
1337 17 Jul 2007 @ 0700 17 Jul 2007 @ 1658 BoekelUpload still erupting @ 07:00 end 16:38; end 16:58
1336 12 Jul 2007 @ 1000 --- BoekelUpload marathon end ~ 10:00 (start 17:13 7/11)
1335 09 Jul 2007 @ 0744 --- BoekelUpload marathon ended ~ 7:44
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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