Last Known Eruption
13d 7h 52m ago

Latest Eruptions

Eruption DurationInterval
07 Nov 2019 @ 1437 ns37d 5h 50m
01 Oct 2019 @ 0947 ie4d 16h 20m
26 Sep 2019 @ 17273d 4h 47m
23 Sep 2019 @ 1240 ie9m 3d 48m
20 Sep 2019 @ 1152 ie1d 8m
19 Sep 2019 @ 1144 ie4d 4m
15 Sep 2019 @ 1139:436m 53s 18h 3m
14 Sep 2019 @ 17362d 2h 22m
12 Sep 2019 @ 15149m 1d 23h 34m
10 Sep 2019 @ 1540 ns4h 37m
10 Sep 2019 @ 11034d 22h 49m
05 Sep 2019 @ 1214~21m 1d 4m
04 Sep 2019 @ 1210 ns9d 1h 53m
26 Aug 2019 @ 101718h 52m
25 Aug 2019 @ 15258m 1d 8h 7m
24 Aug 2019 @ 071814m 14h 31m
23 Aug 2019 @ 164725m 6d 2h 29m
17 Aug 2019 @ 1418~2m 7d 4h 21m
10 Aug 2019 @ 09578m 30s 1d 27m
09 Aug 2019 @ 0930 ie1d 1h 23m
08 Aug 2019 @ 0807 ie1d 22h 29m
06 Aug 2019 @ 0938 ie19h 9m
05 Aug 2019 @ 1429 ie2d 22h 4m
02 Aug 2019 @ 1625 ie5h 52m
02 Aug 2019 @ 1033 ie1d 17h 21m
31 Jul 2019 @ 1712 ie3d 6h 49m
28 Jul 2019 @ 102321h 13m
27 Jul 2019 @ 131018m 6d 22h 3m
20 Jul 2019 @ 150728m 8h 6m
20 Jul 2019 @ 0701 ns7d 12h 53m
12 Jul 2019 @ 1808~6m 6d 7h 25m
06 Jul 2019 @ 1043 ie8d 14h 34m
27 Jun 2019 @ 200915m 1d 7h 56m
26 Jun 2019 @ 121327m 1d 5h 33m
25 Jun 2019 @ 064017m 17h 15m
24 Jun 2019 @ 132528m 1d 17h 36m
22 Jun 2019 @ 194911m 7h 25m
22 Jun 2019 @ 122410m 5d 58m
17 Jun 2019 @ 1126 ie3d 30m
14 Jun 2019 @ 1056 ? ie wc1d 2h 1m
13 Jun 2019 @ 08558d 16h 55m
04 Jun 2019 @ 160026m 1d 21h 35m
02 Jun 2019 @ 18253m 17s 7h 7m
02 Jun 2019 @ 11184m 2s 3d 22h 48m
29 May 2019 @ 1229:164m 15s 15h 57m
28 May 2019 @ 20326d 3h 10m
22 May 2019 @ 172216m 1h 10m
22 May 2019 @ 1612 ie>2.5m 4d 1h 39m
18 May 2019 @ 143334m 4d 1h 19m
14 May 2019 @ 131411d 1h 58m
03 May 2019 @ 11165d 21h 37m
27 Apr 2019 @ 133918m 1d 19h 8m
25 Apr 2019 @ 1831 ns20m 52m
25 Apr 2019 @ 1739 ie37d 34m
19 Mar 2019 @ 1705 ie50d 16m
28 Jan 2019 @ 1549 ie5d 4h 33m
23 Jan 2019 @ 111620m 1d 22h 56m
21 Jan 2019 @ 1220>42m 268d 15h 23m
27 Apr 2018 @ 2157 ie192d 11h 11m
17 Oct 2017 @ 1046 ns>3m 50d 20h 38m
27 Aug 2017 @ 140842d 2h 59m
16 Jul 2017 @ 11094m 5d 23h 55m
10 Jul 2017 @ 111422h 53m
09 Jul 2017 @ 122117h 16m
08 Jul 2017 @ 19056d 11h 35m
02 Jul 2017 @ 0730 A32d 21h 55m
30 May 2017 @ 09359d 14h 17m
20 May 2017 @ 1918 ie10m 12d 8h 21m
08 May 2017 @ 1057 ie8d 1h 10m
30 Apr 2017 @ 094722h 2m
29 Apr 2017 @ 11451d 40m
28 Apr 2017 @ 1105 ie3d 17h 55m
24 Apr 2017 @ 17103d 6h 5m
21 Apr 2017 @ 1105 ie167d 21h 23m
04 Nov 2016 @ 134220d 1h 1m
15 Oct 2016 @ 1241 ie7d 20h 38m
07 Oct 2016 @ 160322h 18m
06 Oct 2016 @ 1745 ie7h 28m
06 Oct 2016 @ 10174d 18h 7m
01 Oct 2016 @ 1610 ie2d 5h 52m
29 Sep 2016 @ 1018 ns18h 11m
28 Sep 2016 @ 1607 ie3d 2h 48m
25 Sep 2016 @ 1319 ie3d 19h 21m
21 Sep 2016 @ 17583d 3h 22m
18 Sep 2016 @ 1436 ie2d 3h 26m
16 Sep 2016 @ 1110 ns4d 20h 38m
11 Sep 2016 @ 14327m 1d 23h 1m
09 Sep 2016 @ 1531 ns5h 18m
09 Sep 2016 @ 101318h 16m
08 Sep 2016 @ 1557 ie1d 39m
07 Sep 2016 @ 151822h 18m
06 Sep 2016 @ 17003d 3h 24m
03 Sep 2016 @ 133613m 6d 1h 15m
28 Aug 2016 @ 122115h 56m
27 Aug 2016 @ 2025 ie1d 2h 53m
26 Aug 2016 @ 17321d 2h 15m
25 Aug 2016 @ 15176h 19m
25 Aug 2016 @ 08581d 20h 37m
23 Aug 2016 @ 122120m 1d 19h 13m
21 Aug 2016 @ 170814m 9h 7m

Interval Statistics

Interval Count100
Min52m
Max268d 15h 23m
Mean11d 17h 35m
Median2d 4h 39m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
13539 04 Sep 2019 @ 1224 --- c.barwin end time
12835 28 Jul 2019 @ 0938 --- rbwhitaker Got over two feet tall then backed down to nothing
12033 29 Jun 2019 @ 1454 --- Polly Wet around Grotto Fountain.
11992 27 Jun 2019 @ 1712 27 Jun 2019 @ 2007 BrianR After aborted eruption, the Grotto system went into a stalled pattern. Grotto Fountain was in a continuous boil up to 2 ft ( mostly 1 ft and under) from 17:49 to 19:28, 19:34 to 1943, and 19:51 to 19:58. The “pressure pool” was rising and falling just barely in and out of view from 17:20 to 18:51, then staying always in view until Grotto Fountain finally erupted at 20:09. Grotto was silent except for three one minute grumbles during this time. All Spa vents were off and the pool rose only 3 inches during this time.
11991 27 Jun 2019 @ 1708 27 Jun 2019 @ 1711 BrianR 6 to 10 ft eruption aborted, no Grotto
11336 23 May 2019 @ 1420 23 May 2019 @ 1521 Kyle as pressure pool rose and dropped Grotto Fountain bubbled/boiled to a height just above the height of it's cone for brief periods when the pressure pool was full and would stop when pressure pool level dropped
11264 18 May 2019 @ 1348 --- Mkeller Repeat of what happened at 12:56
11265 18 May 2019 @ 1256 --- Mkeller Erupted to 3-4 feet for about 3 minutes. Grotto tried to start. Central Vents erupted instead.
8982 25 Jun 2018 @ 1559 --- BrianR “Pressure Pool” up at 15:59 through 16:06, 263 minutes after last Grotto. Grotto Fountain water to 3 ft at 16:01, no eruption prior to Grotto
8981 25 Jun 2018 @ 1527 --- BrianR “Pressure Pool” up at 15:27 through 15:31 no Grotto Fountain water. 231 minutes after last Grotto
8980 24 Jun 2018 @ 1523 --- BrianR “Pressure Pool” up 15:23 through 15:26, no Grotto Fountain water. 262 minutes after last Grotto
7047 23 Sep 2017 @ 1600 23 Sep 2017 @ 1606 Polly Bubbles increasing to ~6 inches steady, then off 1606.
3517 20 Aug 2016 @ 1931 --- Kitt B Grotto Fountain ended at 1931
2533 11 Oct 2015 @ 1223 --- Siegmund Bubbling vigorously 1223; boiling hard 1228-1231, but never got more than ~30cm high
2151 14 Aug 2015 @ 1312 --- JSJ Blipping at 1312 (Grotto & Rocket started at 1314).
1656 28 May 2015 @ 1448 --- Archer Saw two distinct steam clouds from F&M. By the time I walked up to the Grotto area, Grotto Fountain was at 10 ft. and dying down. Not sure if missed or aborted eruption.
1612 19 May 2015 @ 1347 19 May 2015 @ 1358 JSJ Intermittent small blipping to very low spouting from 1347 to 1358. No more after Grotto Geyser eruption start at 1358.
1005 29 Aug 2008 @ 0000 29 Aug 2008 @ 2359 BoekelUpload
1352 09 Jun 2007 @ 0900 09 Jun 2007 @ 0909 BoekelUpload 9:0x
3879 03 Jul 2006 @ 0700 03 Jul 2006 @ 1545 Tara Grotto Fountain had been having periodic boiling episodes since sometime before 0700. These episodes alternated with eruptions by South Grotto Fountain. There were three stronger episodes at 0711, 1100, and 1400. These occurred midway between hourly Giant hot periods. When Grotto Fountain finally did erupt, it was weak and lasted only 5 minutes, but Grotto did follow at 1548.
EntrySourceLinkComment
04 Jun 2019 @ 1600 Janet Jones https://www.instagram.com/p/ByTruIXgn3S/?igshid=1p95trg6cm06a video - just wow!
06 Jun 2016 @ 1728 JSJ https://www.youtube.com/watch?v=zx8TS3vUBX8#t=5m32s Video compilation (starting at time stamp 5:32) of Grotto Fountain Geyser's 5:28 to 5:50 PM eruption on 6 June 2016.
12 May 2013 @ 1246 JSJ https://www.youtube.com/watch?v=Oezz90AHebA Video by Will Boekel of Grotto Fountain Geyser in eruption at 12:46 PM-onward on 12 May 2013.
27 Jun 2013 @ 1323 JSJ https://www.youtube.com/watch?v=gefNjjZY-vo Video by Will Boekel showing Grotto Fountain Geyser's 1:23 PM-onward eruption on 27 June 2013.
06 Jun 2016 @ 1728 JSJ https://www.flickr.com/photos/jsjgeology/30841241351 Photo (1 of 23) of Grotto Fountain Geyser's 5:28 to 5:50 PM eruption on 6 June 2016.
12 Jul 2013 @ 0835 JSJ https://www.youtube.com/watch?v=n2NnnyK4nYo Video by Micah Kipple of the Grotto Fountain Geyser-South Grotto Fountain Geyser dual eruption during the morning of 12 July 2013.
BaselineDistance (ft)Description
West Side 100Note this one is off trail beyond the bumper logs on a cinder block just beyond the sign on the log to the west side.


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