Last Known Eruption
35d 23h 29m ago

Latest Eruptions

Eruption DurationInterval
18 Oct 2020 @ 1409~30m 5d 19h 59m
12 Oct 2020 @ 1810~29m 4d 9h 41m
08 Oct 2020 @ 08299m 28s 1d 19h 57m
06 Oct 2020 @ 1232 ie wc3d 31m
03 Oct 2020 @ 1201 ie wc20h 9m
02 Oct 2020 @ 1552 ie4d 1h 6m
28 Sep 2020 @ 144623h 20m
27 Sep 2020 @ 1526~10m 21h 31m
26 Sep 2020 @ 1755 ie5d 3h 34m
21 Sep 2020 @ 14211m 5h 54m
21 Sep 2020 @ 082712m 24s 6d 12h 39m
14 Sep 2020 @ 19482m 14d 7h 44m
31 Aug 2020 @ 120427m 23h 29m
30 Aug 2020 @ 12351d 20h 31m
28 Aug 2020 @ 160424m 3d 58m
25 Aug 2020 @ 15062.5m 22h 7m
24 Aug 2020 @ 16598m 7h 10m
24 Aug 2020 @ 09494.5m 2d 19h 7m
21 Aug 2020 @ 14421d 6h 14m
20 Aug 2020 @ 082817m 32s 1d 17h 48m
18 Aug 2020 @ 144026m 13s 2d 2h 58m
16 Aug 2020 @ 114220h 19m
15 Aug 2020 @ 15231d 3h 19m
14 Aug 2020 @ 1204 ie wc1d 3h 19m
13 Aug 2020 @ 0844:5521m 28s 1d 1h 35m
12 Aug 2020 @ 0709 ie5d 22h 33m
06 Aug 2020 @ 0836 ns>12m 1d 19h 12m
04 Aug 2020 @ 1323:56 ie13h 47m
03 Aug 2020 @ 2336 ie wc8d 5h 46m
26 Jul 2020 @ 1750 ie wc8d 7h 4m
18 Jul 2020 @ 1046 ie wc3d 18h 23m
14 Jul 2020 @ 162311m 23s 12d 22h 23m
01 Jul 2020 @ 18002m 22h 45m
30 Jun 2020 @ 191513m 7h 11m
30 Jun 2020 @ 120412m 22h 48m
29 Jun 2020 @ 131629m 2d 14h 50m
26 Jun 2020 @ 2226 ie8h 46m
26 Jun 2020 @ 134022m 6d 31m
20 Jun 2020 @ 1309 ie1d 3h 43m
19 Jun 2020 @ 0926 ie7d 41m
12 Jun 2020 @ 0845 ie wc2d 16h 52m
09 Jun 2020 @ 1553 ie3d 7h 53m
06 Jun 2020 @ 0800 A2d 13h 37m
03 Jun 2020 @ 18232d 2h 24m
01 Jun 2020 @ 1559 ie12d 4h 42m
20 May 2020 @ 1117 ie wc2d 21h 27m
17 May 2020 @ 1350 ie wc4d 2h 37m
13 May 2020 @ 1113 ie wc2d 18h 16m
10 May 2020 @ 1657 ie1d 2h 28m
09 May 2020 @ 1429 ie wc17d 20h 50m
21 Apr 2020 @ 173912d 4h 13m
09 Apr 2020 @ 1326 ie wc18d 20h 38m
21 Mar 2020 @ 1648 ie wc11d 5h 11m
10 Mar 2020 @ 1137 ? ns wc8d 1h 28m
02 Mar 2020 @ 0909 ?1d 10h 8m
29 Feb 2020 @ 2301 E114d 8h 24m
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

Interval Statistics

Interval Count100
Min4h 37m
Max114d 8h 24m
Mean5d 1h 56m
Median2d 2h 41m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
16086 12 Sep 2020 @ 1352 --- CraigC pressure pool up
16085 12 Sep 2020 @ 1305 --- CraigC pressure pool up
16065 11 Sep 2020 @ 1534 --- CraigC pressure pool is full
15951 04 Sep 2020 @ 1003 --- TheHikingDude pool empty
15929 02 Sep 2020 @ 0811 --- CraigC pressure pool up, small bubbling in GF
15912 31 Aug 2020 @ 1201 --- CraigC pressure pool rising. 1202 bursting in GF
15910 31 Aug 2020 @ 1122 --- CraigC pressure pool up, then fell, small bursting from GF
15909 31 Aug 2020 @ 1040 --- CraigC pressure pool up, just dropped. small bubbling from gf
15719 23 Aug 2020 @ 1247 23 Aug 2020 @ 1413 BrianR Overflowed water at various times in buildup to Grotto eruption, but never boiled. Pressure Pool had visible water ~ 95% of this time frame. This and South Grotto Fountain series of eruptions was due to Spa having a flowing runoff channel to the river and all three of its vents bubbling (I.e., it was trying to start at the same time as Grotto). Also Grotto Central Vents were active in this time frame when South Grotto Fountain was not erupting. Demetri will provide notes on Startling during this time frame
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 --- mhreed 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.
15329 19 Nov 1996 @ 1103 --- JarnoO overflowing heavily ~15-20 gpm
EntrySourceLinkComment
26 Jun 2020 @ 1345 JarnoO https://www.youtube.com/watch?v=u5PSt5bVzBI As seen from the webcam, by LindaG.
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.