| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 22377 |
07 Jul 2022 @ 0745 |
--- |
JimS |
Off before this time. |
| 22307 |
04 Jul 2022 @ 1019 |
--- |
aferrara |
Grotto off, South Grotto Fountain splashing |
| 22222 |
30 Jun 2022 @ 0629 |
--- |
JimS |
Off and quiet. Marathon pool very low. Yesterday's marathon was a long one. |
| 21955 |
12 Jun 2022 @ 1524 |
--- |
Graham |
Still ie. Bijiu off. |
| 21928 |
11 Jun 2022 @ 1536 |
--- |
Graham |
Central vents ie. |
| 21921 |
11 Jun 2022 @ 1114 |
--- |
Graham |
Turned off recently. |
| 21884 |
10 Jun 2022 @ 0836 |
--- |
SteveO |
End at 0826 |
| 21874 |
09 Jun 2022 @ 1931 |
--- |
Forestbewithyou |
Off at this time |
| 21854 |
09 Jun 2022 @ 0650 |
--- |
JimS |
Ended by 0650. |
| 21826 |
08 Jun 2022 @ 1124 |
--- |
SantaFe108 |
Off before this time. |
| 21776 |
06 Jun 2022 @ 1202 |
--- |
Forestbewithyou |
Just shut off |
| 21738 |
05 Jun 2022 @ 0930 |
--- |
JimS |
Shutting down |
| 21719 |
04 Jun 2022 @ 1035 |
--- |
Graham |
Off before now. |
| 21587 |
30 May 2022 @ 1749 |
--- |
Graham |
Energy surge huffing steam. Doesnt seem close to erupting yet. Also 1816 |
| 21553 |
28 May 2022 @ 1304 |
--- |
Graham |
Central vents 1304ns. 1308 off. Also 1318 d=2m, 1327 d=5m, 1142 till Grotto started 1351. |
| 21543 |
27 May 2022 @ 2134 |
--- |
Ben VL |
Still ie |
| 21503 |
25 May 2022 @ 1930 |
--- |
Art |
Grotto no longer ie |
| 21485 |
25 May 2022 @ 1600 |
--- |
Art |
Grotto not ie |
| 21463 |
24 May 2022 @ 1530 |
--- |
Ben VL |
End of eruption 1530/31. |
| 21373 |
20 May 2022 @ 0640 |
--- |
RMichaels |
Grotto looks to have recently finished an eruption. Marathon Pool down about 18 inches. |
| 21369 |
19 May 2022 @ 1911 |
--- |
Graham |
Still ie from this morning. |
| 21313 |
16 May 2022 @ 1125 |
--- |
Brando |
Grotto off |
| 20717 |
17 Jan 2022 @ 1240 |
--- |
Graham |
Not ie at this time. |
| 20648 |
08 Jan 2022 @ 0913 |
--- |
aferrara |
Off sometime before this time. probably within 20 minutes. |
| 20127 |
25 Oct 2021 @ 1549 |
--- |
Darcie |
In eruption. Marathon pool is low (well below the orange ring) |
| 20009 |
16 Oct 2021 @ 2220 |
--- |
Brando |
Still ie at 22:20 |
| 19919 |
06 Oct 2021 @ 1540 |
06 Oct 2021 @ 1615 |
aferrara |
Off sometime in this window |
| 19851 |
02 Oct 2021 @ 1340 |
--- |
Kitt B |
Central ent delay at Grotto |
| 19822 |
01 Oct 2021 @ 0755 |
--- |
ddshepard |
Grotto is off |
| 19819 |
30 Sep 2021 @ 1950 |
--- |
Graham |
End. No Rocket. |
| 19803 |
30 Sep 2021 @ 1427 |
--- |
ddshepard |
Grotto off about this time. No Rocket major observed from about 13:45 onward |
| 19795 |
29 Sep 2021 @ 1758 |
--- |
Frypan9 |
Eruption stopped at 17:58 |
| 19765 |
28 Sep 2021 @ 0650 |
--- |
Graham |
Off when I walked by. Quit overnight after a 28+ hour eruption. |
| 19753 |
27 Sep 2021 @ 1941 |
--- |
Graham |
Still ie from yesterday afternoon D>28h |
| 19738 |
26 Sep 2021 @ 0912 |
--- |
User34 |
Off, was on just a few minutes prior |
| 19729 |
25 Sep 2021 @ 1548 |
--- |
Graham |
Central vents on. Also 1556, 1606, 1738. |
| 19725 |
25 Sep 2021 @ 0812 |
--- |
Brian |
Off now |
| 19631 |
17 Sep 2021 @ 0943 |
--- |
CrisG |
eruption has ended |
| 19571 |
14 Sep 2021 @ 2245 |
--- |
Brando |
Grotto appears to be off at this time |
| 19500 |
12 Sep 2021 @ 0640 |
--- |
Graham |
Off and having an energy push. Bijou on, pressure pool up. Yesterdays eruption didn't go on too long, 6 to 10h, but maybe enough to get a Fountain today? |
| 19501 |
11 Sep 2021 @ 2000 |
--- |
Graham |
Still ie. |
| 19481 |
11 Sep 2021 @ 1733 |
--- |
User34 |
Two central vents on, Grotto shutting off, central vents cycled off and on and then Grotto restarted at 1739 |
| 19352 |
07 Sep 2021 @ 1040 |
--- |
Kitt B |
Grotto ended at 1040 |
| 19330 |
06 Sep 2021 @ 0916 |
--- |
Kitt B |
Grotto ended at 0916 |
| 19322 |
05 Sep 2021 @ 1924 |
--- |
Graham |
Quit 1924, so a short duration. |
| 19315 |
05 Sep 2021 @ 1258 |
--- |
Graham |
Central vents ie. also 1337ie and 1347, 1m before Grotto started without Grotto Fountain. |
| 19179 |
31 Aug 2021 @ 2135 |
--- |
William |
grotto on weak, marathon pool was low at this time. |
| 19164 |
30 Aug 2021 @ 1251 |
--- |
Graham |
Ended 1251, duration just over 3h30m. One Rocket Major near the end. |
| 19145 |
29 Aug 2021 @ 1144 |
--- |
BrianR |
End of eruption |
| 19155 |
29 Aug 2021 @ 0728 |
29 Aug 2021 @ 0953 |
BrianR |
Very unusual activity in Grotto complex, one of the two strangest starts I have ever seen.
At 7:28 I arrived at Grotto to here it grumbling without any water splashing. I then saw the “pressure pool” was up and heard water boiling at Grotto Fountain. I then saw that Spa was in overflow with fast moving water to the river. From past observations I knew this was going to cause chaos if Grotto is trying to start. Further observation of the fountain area I saw that besides Grotto Fountain boiling at about one feet, The two vents in front of South Grotto Fountain were also boiling. Now the details going forward:
7:28-8:28
Grotto - grumbling with No water splashes or central vent activity
“Pressure Pool “ - always up
Grotto Fountain - continuous 1 ft boil
Two vents in front of South Grotto Fountain - 1 to 4 ft continuous boiling
South Grotto Fountain main pool - barely a weak 1 ft splash every five minutes
Startling - 1 to 2 ft sporadic splashing (I started to check it at 8:15)
Spa - continuous strong overflow without any vents on
8:28
Spa - overflow stopped, pool starts to drop
8:28-8:59
All previous described activity continues except Spa is no longer in overflow
8:59
Grotto becomes silent, Grotto Fountain stops visible boiling
8:59 - 9:39
Grotto and Grotto Fountain - in conjunction,
Three Grotto grumbling (still no water splashes) and Grotto Fountain boiling up to 4 ft episodes (9:06-9:09, 9:18-9:25, 9:33-9:39) with equal amount of time of silence and not boiling between.
“Pressure Pool” - always up but changing level with Grotto Fountain
South Grotto Fountain front vents - one or both now boiling a few inches to 2 ft, stronger when Grotto Fountain not boiling
South Grotto Fountain main vent - still very little weak one ft splashes
Startling - one ft sporadic splashes more. active when Grotto Fountain not boiling
Spa - only half of its pool full at 9:30
9:42 Grotto Fountain starts a boil that leads to the 9:48 eruption, Grotto silent this time
9:52 South Grotto Fountain erupts
9:51 Grotto starts to grumble, has first splash of water at 9:52, and erupts at 9:53
A minute or so later Startling had a 4 ft burst followed by a couple of 2 ft bursts about a half minute later before South Grotto Fountain flooded it. It did not erupt.
Note again this activity was already in progress upon my arrival |
| 19642 |
28 Aug 2021 @ 0724 |
28 Aug 2021 @ 1808 |
BrianR |
Arrived at Grotto knowing that a marathon eruption ended sometime in the early morning
Grotto Splashes of water:
12:36
18:08
Rocket Splashes of water:
8:09-8:10
8:36
9:36
11:23
12:00
12:24
14:19
14:59
First heard Grotto Fountain water: 15:05
Grotto Fountain splashes/boiling:
17:37
18:05-18:08
Pressure Pool up:
17:08
17:36-17:38
18:05-18:08
Spa pool level and vents:
See 8/22 Spa comments for definition key
7:25 — 1, LV on (north pool vent)
9:01 — 1.25
9:34 — 1.5
9:45 — 1.75
10:40 — 2
10:48 — LV off
12:01 — 2
12:50 — 2.25
13:45 — 2.25
14:41 — 2.75
15:08 — 3
15:48 — 3
16:14 — 3.25
16:42 — 3.25
17:44 — 3.5
Left area at 18:15, heard next day that 2 more Pressure Pool up cycles were seen, but was left unattended after that. |
| 19122 |
28 Aug 2021 @ 0615 |
--- |
William |
off when I passed at this time |
| 19101 |
27 Aug 2021 @ 0825 |
--- |
BrianR |
End of eruption
Expanded comments prior to end of eruption:
Arrived at Grotto 7:16 to find it i.e.
Grotto Central Vents:
Upper Pair 8:08-8:14
Upper Pair 8:22-8:24
Spa pool level and vents:
See 8/22 Spa comments for definition key
7:17 — 7, all vents off
7:30 — 5
7:39 — 3
8:16 — 1.25
8:41 — 2 |
| 19093 |
26 Aug 2021 @ 1803 |
--- |
BrianR |
End of eruption |
| 19091 |
26 Aug 2021 @ 1415 |
--- |
BrianR |
End of eruption |
| 19090 |
26 Aug 2021 @ 1117 |
--- |
BrianR |
End of eruption |
| 19061 |
25 Aug 2021 @ 1447 |
--- |
BrianR |
End of eruption |
| 19055 |
25 Aug 2021 @ 0823 |
--- |
BrianR |
End of eruption |
| 19045 |
24 Aug 2021 @ 1403 |
--- |
BrianR |
End of eruption
After eruption observations until I left area:
Grotto Splashes of water:
16:56
Rocket Splashes of water:
16:32
First heard Grotto Fountain water boiling: 15:59
Grotto Fountain splashes/boiling:
15:59-16:05
16:13-16:34
16:48-16:57
Pressure Pool up:
16:52-16:57
Spa pool level and vents:
See 8/22 Spa comments for definition key
14:05 — 2
14:41 — 3, LV on (north pool vent)
15:02 — 3.25
15:17 — 3.75
15:33 —- 4.1
15:47 —- 5
15:59 — 4.1, LV off
16:16 — 3.5
16:34 — 3.5
16:58 — 4
Left area 17:00 |
| 19044 |
24 Aug 2021 @ 0812 |
--- |
BrianR |
End of eruption
Expanded comments:
Arrived at 7:35 with Grotto i.e.
“Rocket Little Buddies”:
See 8/22 Grotto comments for definition key
Main, Tiny, Key 7:35 i.e.-8:11 |
| 19029 |
23 Aug 2021 @ 0902 |
--- |
BrianR |
End of eruption
Expanded comments relating to the previous Spa and Grotto eruption and the lead up to the next Grotto and Grotto Fountain eruption:
Arrived at 7:33 to Grotto i.e. knowing Spa was seen in eruption at 6:20, but I did not see any bursts.
Spa pool level and vents:
See 8/22/21 Spa comments for definition key
7:34 — 9, LV, BRV, RV all on
7:45 — RV off (south pool forward vent)
7:51 — BRV off (south pool back vent)
7:52 — LV off (north pool vent)
8:08 — 4
8:27 — 1
8:32 — 0
9:08 — 1, LV on
10:06 — 1
10:31 — 1.5
11:03 — 1.5
11:31 — 2
12:13 — 2.5
12:46 — LV off
12:56 — 3
13:31 — 3.25
13:49 — 3.25
14:21 — 3
14:52 — 3.25
15:21 — 3.25
15:49 — 3.25
16:48 — 3.25
17:36 — 3.5
18:12 — 3.5
Grotto Central Vents:
Upper Pair 8:59-9:02
Grotto Splashes of water:
10:59
“Rocket Little Buddies”
See 8/22/21 Grotto comments for definition key
Main & Tiny 8:10 i.e.-9:02
Key 8:58-9:02
Rocket Splashes of water:
9:43
9:46
10:15-10:17
10:27
10:59
11:24
11:28
12:03
12:41
13:15
13:39
Pressure Pool up:
16:02
16:44-16:46
17:30-17:34
18:18-18:23
Grotto Fountain splashes/boiling:
16:42
16:46
17:26
17:29-17:34
17:51
17:55
18:12
18:19-18:26
Unfortunately had to leave Grotto area at 18:30 did not get to see 19:13 Grotto Fountain eruption |
| 18991 |
22 Aug 2021 @ 1520 |
--- |
BrianR |
End of eruption
Expanded details before and after eruption ended follow
10:33 — arrived at Grotto i.e.
“Rocket Little Buddies” definitions:
Buddy layout north to south: Tiny, Main, Key (the hole) sit at the northwest corner of Rocket and Distant sits apart of the others at the middle (west)
“Rocket Little Buddies”:
Main & Tiny 10:33-15:20
Grotto Splashes of water:
17:23
Rocket Splashes of water:
15:40
15:58-16:00
16:16
16:18
16:55
17:24
Spa pool levels and vents:
See Spa eruption comments for definition key and info before 15:20
15:31 — 0.5, LV on (north pool vent)
16:07 — 0.5
16:26 — 0.5
16:42 — 1
17:06 — 1.5
17:28 — 1.75
17:38 — 2, LV still on
Left Grotto at 17:40 |
| 18868 |
08 Aug 2021 @ 2015 |
08 Aug 2021 @ 2035 |
William |
turned off during this time. |
| 18751 |
31 Jul 2021 @ 1101 |
--- |
Dan A |
Grotto off |
| 18727 |
29 Jul 2021 @ 1343 |
--- |
SantaFe108 |
Eruption ended. Rocket continued to splash till 1947. |
| 18689 |
27 Jul 2021 @ 1540 |
--- |
JarnoO |
(wc) Marathon quit between 1533 and 1540, 19h15m < d < ~19h32m |
| 18604 |
23 Jul 2021 @ 1331 |
--- |
BrianR |
End of eruption |
| 18594 |
22 Jul 2021 @ 1158 |
--- |
BrianR |
End of eruption |
| 18564 |
21 Jul 2021 @ 1605 |
--- |
BrianR |
End of marathon eruption |
| 18558 |
21 Jul 2021 @ 0615 |
--- |
BrianR |
Eruption from 15:38 yesterday is still I.e |
| 18553 |
20 Jul 2021 @ 1219 |
--- |
BrianR |
End of eruption |
| 18552 |
20 Jul 2021 @ 0630 |
--- |
BrianR |
Grotto is off upon my arrival in area |
| 18531 |
19 Jul 2021 @ 1729 |
--- |
BrianR |
End of eruption |
| 18530 |
19 Jul 2021 @ 1355 |
--- |
BrianR |
End of eruption |
| 18529 |
19 Jul 2021 @ 0813 |
--- |
BrianR |
End of eruption |
| 18515 |
18 Jul 2021 @ 1944 |
--- |
BrianR |
End of eruption |
| 18514 |
18 Jul 2021 @ 1458 |
--- |
BrianR |
End of eruption |
| 18513 |
18 Jul 2021 @ 1108 |
--- |
BrianR |
End of eruption |
| 18482 |
17 Jul 2021 @ 1755 |
--- |
BrianR |
End of eruption |
| 18481 |
17 Jul 2021 @ 1129 |
--- |
BrianR |
End of eruption |
| 18385 |
12 Jul 2021 @ 1254 |
--- |
deanl |
ending after 2 rockets! |
| 18357 |
11 Jul 2021 @ 1126 |
--- |
William |
central vents delay, high water volume in grotto. |
| 18337 |
10 Jul 2021 @ 0758 |
--- |
donnielg |
Off at 7:58 |
| 18318 |
09 Jul 2021 @ 1022 |
--- |
donnielg |
Off at 10:22 |
| 18285 |
06 Jul 2021 @ 0650 |
--- |
deanl |
was ie at 6:50 - don't know how long |
| 18231 |
01 Jul 2021 @ 1909 |
--- |
William |
central vents delay |
| 18229 |
01 Jul 2021 @ 1856 |
--- |
William |
central vents delay |
| 18230 |
01 Jul 2021 @ 1830 |
--- |
William |
central vents delay around this time, did not get exact start of vents |
| 18114 |
27 Jun 2021 @ 1509 |
--- |
TheHikingDude |
Off at this time. Deep gurgling. |
| 18094 |
25 Jun 2021 @ 2222 |
--- |
annelies8 |
still ie |
| 18075 |
24 Jun 2021 @ 2036 |
--- |
William |
grotto turned off at this time after Rocket maj |
| 18029 |
22 Jun 2021 @ 1953 |
--- |
CrisG |
still ie |
| 18010 |
22 Jun 2021 @ 1457 |
--- |
CrisG |
still IE. bijou slowing down |
| 17979 |
21 Jun 2021 @ 1412 |
21 Jun 2021 @ 1416 |
William |
central vents active |
| 17944 |
20 Jun 2021 @ 1801 |
--- |
K.Cooper |
off by this time |
| 17903 |
19 Jun 2021 @ 0805 |
--- |
JimS |
Turned off by 0805 but still steaming and splashing. |
| 17895 |
18 Jun 2021 @ 2208 |
--- |
CrisG |
still in eruption |
| 17892 |
18 Jun 2021 @ 2036 |
--- |
Craigmon99 |
Still in eruption |
| 17844 |
16 Jun 2021 @ 0713 |
--- |
CraigC |
Grotto shut off |
| 17806 |
15 Jun 2021 @ 1323 |
--- |
CraigC |
Grotto shut off |