Last Known Eruption
11h 44m ago

Latest Eruptions

Eruption DurationInterval
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
14 Sep 2018 @ 0837 nsapprox 1h 12m15h 41m
13 Sep 2018 @ 16561h 28m4h 35m
13 Sep 2018 @ 12211h 14 m3h 34m
13 Sep 2018 @ 0847 nsapprox 1 hr 53m11h 33m
12 Sep 2018 @ 21144h 48m
12 Sep 2018 @ 1626 ie3h 58m
12 Sep 2018 @ 1228 ie3h 56m
12 Sep 2018 @ 08322h 23m17h 23m
11 Sep 2018 @ 150940m 3h 23m
11 Sep 2018 @ 1146 ie4h 55m
11 Sep 2018 @ 0651 ns20m 11h 51m
10 Sep 2018 @ 1900 ie1d 2h 58m
09 Sep 2018 @ 1602 ie23h 2m
08 Sep 2018 @ 1700 ns2h 52m
08 Sep 2018 @ 14082h 24m
08 Sep 2018 @ 1144 ie1h 10m
08 Sep 2018 @ 1034 ns1h 44m5h 47m
08 Sep 2018 @ 04475h 57m
07 Sep 2018 @ 2250 ns3h 25m
07 Sep 2018 @ 1925 A32m 4h 6m
07 Sep 2018 @ 15192hour about4h 26m
07 Sep 2018 @ 10534h 2m
07 Sep 2018 @ 065143m 11h 27m
06 Sep 2018 @ 19246h 2m
06 Sep 2018 @ 13221h 39m3h 29m
06 Sep 2018 @ 09532h 45m
06 Sep 2018 @ 070827m 11h 15m
05 Sep 2018 @ 1953 ie2h 40m
05 Sep 2018 @ 1713 ns3h 52m
05 Sep 2018 @ 13211h 2m 3h 31m
05 Sep 2018 @ 0950 ie3h 35m
05 Sep 2018 @ 0615 ie10h 2m
04 Sep 2018 @ 20133h 10m
04 Sep 2018 @ 17032h 1m3h 54m
04 Sep 2018 @ 13091h 17m8h 6m
04 Sep 2018 @ 0503 ie10h 53m
03 Sep 2018 @ 18103h 10m
03 Sep 2018 @ 15003h 19m
03 Sep 2018 @ 11412h 44m
03 Sep 2018 @ 08572h 48m
03 Sep 2018 @ 0609 ie7h 12m
02 Sep 2018 @ 2257 ie3h 54m
02 Sep 2018 @ 1903 ns4h 21m
02 Sep 2018 @ 14425h 16m
02 Sep 2018 @ 092615h 35m
01 Sep 2018 @ 1751 ns3h 26m
01 Sep 2018 @ 142538m 3h 39m
01 Sep 2018 @ 104640m 5h 15m
01 Sep 2018 @ 0531 ns4hr 1m1h 42m
01 Sep 2018 @ 0349 ie9h 58m
31 Aug 2018 @ 1751 ie4h 40m
31 Aug 2018 @ 13115h 28m
31 Aug 2018 @ 07431h 32m 8h 50m
30 Aug 2018 @ 22533h 49m
30 Aug 2018 @ 1904 ie2h 49m
30 Aug 2018 @ 16151h 34m 4h 9m
30 Aug 2018 @ 12061h 24m 3h 47m
30 Aug 2018 @ 08192h 38m
30 Aug 2018 @ 05411h 40m 8h 11m
29 Aug 2018 @ 2130 ns4h 33m
29 Aug 2018 @ 16572h3h 46m
29 Aug 2018 @ 13111h 2m 3h 7m
29 Aug 2018 @ 100452m 4h 4m
29 Aug 2018 @ 06001h 22m 8h 21m
28 Aug 2018 @ 21394h 54m
28 Aug 2018 @ 16451h 26m 4h 2m
28 Aug 2018 @ 12434h 14m
28 Aug 2018 @ 08291h 20m 16h 46m
27 Aug 2018 @ 15433h 42m
27 Aug 2018 @ 120156m 5h 14m
27 Aug 2018 @ 064756m 14h 15m
26 Aug 2018 @ 16321h 38m 6h 2m
26 Aug 2018 @ 10301h 45m 4h 3m
26 Aug 2018 @ 0627 ie12h 30m
25 Aug 2018 @ 17571h 24m 3h 56m
25 Aug 2018 @ 140158m 4h 27m
25 Aug 2018 @ 09341h 32m 14h 25m
24 Aug 2018 @ 19093h 42m
24 Aug 2018 @ 15271h 5m 3h 48m

Interval Statistics

Interval Count100
Min1h 10m
Max1d 2h 58m
Mean6h 46m
Median4h 23m

Latest Notes

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


All data is shown in US/Mountain timezone unless specified otherwise.

GeyserTimes.org is not affiliated with the National Park Service, but it is "for the benefit and enjoyment of the people".

If you have any questions or comments please contact: webmaster@geysertimes.org

Support open geyser data: Patreon Page

© Copyright 2011-2018

Facebook Page Telegram Channel Google+ Page Get it on Google Play Download on the App Store

Google Play and the Google Play logo are trademarks of Google LLC.

Apple and the Apple logo are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc., registered in the U.S. and other countries.