Last Known Eruption
1d 9h 29m ago

Latest Eruptions

Eruption DurationInterval
24 Mar 2023 @ 1222 ie wc10d 2h 34m
14 Mar 2023 @ 0948 ie1d 19h 39m
12 Mar 2023 @ 1409 ie1d 22h 29m
10 Mar 2023 @ 1440 ie22h 7m
09 Mar 2023 @ 1633 ie wc4d 2h 5m
05 Mar 2023 @ 1428 ie4h 50m
05 Mar 2023 @ 0938 ie19h 21m
04 Mar 2023 @ 14171d 1h 14m
03 Mar 2023 @ 1303 ie wc1d 3h 5m
02 Mar 2023 @ 0958 ns16h 46m
01 Mar 2023 @ 1712 ie wc1d 3h 44m
28 Feb 2023 @ 1328 ie wc1d 1h 27m
27 Feb 2023 @ 1201 ie1d 2h 33m
26 Feb 2023 @ 0928 ie17h 32m
25 Feb 2023 @ 1556 ie6h 8m
25 Feb 2023 @ 0948 ie6d 37m
19 Feb 2023 @ 091122h 59m
18 Feb 2023 @ 1012 ie19h 2m
17 Feb 2023 @ 1510 wc1d 2h 8m
16 Feb 2023 @ 1302 ie wc3d 1h 38m
13 Feb 2023 @ 1124 ie23h 56m
12 Feb 2023 @ 1128 ie wc1d 40m
11 Feb 2023 @ 1048 ie18h 19m
10 Feb 2023 @ 1629 ie wc4d 6h 14m
06 Feb 2023 @ 1015 ie23h 19m
05 Feb 2023 @ 1056 ie20h 31m
04 Feb 2023 @ 1425 ie wc4d 20h 46m
30 Jan 2023 @ 1739 ie wc2d 3h 21m
28 Jan 2023 @ 1418 ie2d 23h 7m
25 Jan 2023 @ 1511 ie6d 3h 19m
19 Jan 2023 @ 1152 ie4d 2h 9m
15 Jan 2023 @ 0943 ie18h 58m
14 Jan 2023 @ 1445 ie5h 52m
14 Jan 2023 @ 0853 ie17h 53m
13 Jan 2023 @ 1500>5h 42m
13 Jan 2023 @ 091820h 38m
12 Jan 2023 @ 1240 ns2d 2h 50m
10 Jan 2023 @ 0950 ie1d 19h 16m
08 Jan 2023 @ 1434 wc3h 52m
08 Jan 2023 @ 1042 ie1d 39m
07 Jan 2023 @ 1003 ie4d 20h 16m
02 Jan 2023 @ 1347 ie1d 1h 18m
01 Jan 2023 @ 1229 ie22h 44m
31 Dec 2022 @ 1345 ie5d 3h 52m
26 Dec 2022 @ 0953 ie1d 19h 24m
24 Dec 2022 @ 1429 ie5d 4h 19m
19 Dec 2022 @ 1010 ie1d 55m
18 Dec 2022 @ 0915 ie10d 23h 31m
07 Dec 2022 @ 0944 ns wc3d 20h 15m
03 Dec 2022 @ 1329 ie wc7d 4h 44m
26 Nov 2022 @ 0845 ie wc2d 18h 9m
23 Nov 2022 @ 1436 ns wc21h 32m
22 Nov 2022 @ 1704 ie wc2d 4h 46m
20 Nov 2022 @ 1218 ie wc9d 10m
11 Nov 2022 @ 1208 ie wc10d 4h 15m
01 Nov 2022 @ 0853 ie wc2d 21h 42m
29 Oct 2022 @ 1111 ie20h 5m
28 Oct 2022 @ 1506 ie2d 1m
26 Oct 2022 @ 1505 ie1d 7h 28m
25 Oct 2022 @ 0737 ie wc21h 7m
24 Oct 2022 @ 1030 ie wc3d 3h 26m
21 Oct 2022 @ 0704 ie wc18h 11m
20 Oct 2022 @ 1253 wc3h 23m
20 Oct 2022 @ 0930 ie2d 7m
18 Oct 2022 @ 0923 ie2d 16h 55m
15 Oct 2022 @ 16281d 6h 51m
14 Oct 2022 @ 0937 ie wc1d 15h 37m
12 Oct 2022 @ 1800 ns4h 25m
12 Oct 2022 @ 1335 ie6h 6m
12 Oct 2022 @ 0729 ie wc11h 39m
11 Oct 2022 @ 1950 A15h 5m
11 Oct 2022 @ 0445 ns wc21h 4m
10 Oct 2022 @ 0741 ie10h 0m
09 Oct 2022 @ 2141 ns wc10h 1m
09 Oct 2022 @ 1140 ie13h 20m
08 Oct 2022 @ 2220 ns wc10h 7m
08 Oct 2022 @ 1213 ie20h 43m
07 Oct 2022 @ 1530 ie3h 32m
07 Oct 2022 @ 1158 ie1h 13m
07 Oct 2022 @ 1045 ie20h 26m
06 Oct 2022 @ 1419 ie19h 2m
05 Oct 2022 @ 1917 ns5h 35m
05 Oct 2022 @ 1342 ns4h 52m
05 Oct 2022 @ 0850 ie2d 14h 20m
02 Oct 2022 @ 1830 wc7h 14m
02 Oct 2022 @ 1116 ie wc1d 20h 51m
30 Sep 2022 @ 14255h 50m
30 Sep 2022 @ 0835 ie wc19h 2m
29 Sep 2022 @ 13336h 30m
29 Sep 2022 @ 0703 ie12h 13m
28 Sep 2022 @ 1850 wc9h 25m
28 Sep 2022 @ 0925 ie18h 5m
27 Sep 2022 @ 1520 ie3h 3m
27 Sep 2022 @ 12171d 42m
26 Sep 2022 @ 1135 ie22h 16m
25 Sep 2022 @ 1319 ie4h 39m
25 Sep 2022 @ 0840 ie13h 29m
24 Sep 2022 @ 1911 ie3h 57m
24 Sep 2022 @ 1514 ie6h 20m
24 Sep 2022 @ 0854 ie wc1d 37m

Interval Statistics

Interval Count100
Min1h 13m
Max10d 23h 31m
Mean1d 19h 43m
Median22h 51m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
24887 13 Jan 2023 @ 1053 --- Graham Quit now.
24723 26 Nov 2022 @ 1522 --- K.Cooper (wc) Still ie
24618 02 Nov 2022 @ 0905 --- mhreed In eruption—this may be the same eruption from yesterday, but I was rushing by and did not stop at Marathon Pool to confirm.
24230 05 Oct 2022 @ 0954 --- aferrara Still ie after Rocket Major.
24167 30 Sep 2022 @ 1033 --- SteveO Grotto is quiet.
24094 25 Sep 2022 @ 1535 --- Graham Not ie.
24000 22 Sep 2022 @ 1456 --- Graham Central vents on. Also 1547
23975 21 Sep 2022 @ 0900 --- TamlynP eruption complete
23811 13 Sep 2022 @ 0750 13 Sep 2022 @ 2110 Ben VL Marathon IE all day. This is likely either the same eruption as my 2035 A from last night, or the one after. Still IE 2110.
23768 11 Sep 2022 @ 1351 11 Sep 2022 @ 1528 aferrara Pressure Pool cycling every 10 minutes, often overtopping it's rim and beautiful blue. Central vents weakly erupting most cycles, heavy steam or splashing in Grotto increasing with each cycle. Between 1500 and the eruption GF overflowed during high pressure pools, but never boiled in this time period.
23766 11 Sep 2022 @ 1245 11 Sep 2022 @ 1345 aferrara Pressure pool cycling 10m, constant visible boiling in Grotto Fountain, stopped when SGF started
23648 08 Sep 2022 @ 0924 --- Kat Grotto off
23622 07 Sep 2022 @ 1315 --- CP Probably started between 1300 and 1315, based a a report by a visitor.
23570 04 Sep 2022 @ 1702 --- Graham End time. No Rocket or Spa.
23557 04 Sep 2022 @ 0900 --- Art End of eruption
23539 02 Sep 2022 @ 1746 --- Art Grotto shutting down/end of eruption.
23526 01 Sep 2022 @ 1422 --- Dave W Grotto off
23518 01 Sep 2022 @ 0700 --- Jake Platform Vents near Grotto ie @ 0700. Grotto Fountain with light splashing. Spa nearly full.
23512 31 Aug 2022 @ 1758 --- Dan A Grotto off
23511 31 Aug 2022 @ 1225 --- Dave W Grotto off
23485 30 Aug 2022 @ 1936 --- Art End of eruption
23477 29 Aug 2022 @ 1410 --- Art End of eruption
23472 29 Aug 2022 @ 0625 --- Art Likely erupted earlier this morning/overnight ? Area around Grotto Fountain and South GF all wet. Area from Grotto all the way to pressure pool wet. Dead quiet at 0625 per Jim S.
23457 28 Aug 2022 @ 0710 --- JimS Ended about 0710.
23456 28 Aug 2022 @ 0623 --- JimS Marathon from yesterday continues. Marathon pool very low. Giant platform shut down.
23447 27 Aug 2022 @ 2058 --- User34 Still ie
23464 27 Aug 2022 @ 1920 --- BrianR Still i.e. @ 19:20, personally seen it i.e. since 6:62
23417 26 Aug 2022 @ 1640 --- BrianR End of eruption
23413 26 Aug 2022 @ 1004 --- BrianR End of eruption
23411 25 Aug 2022 @ 1530 --- BrianR End of eruption
23403 25 Aug 2022 @ 0821 --- BrianR End of eruption
23391 24 Aug 2022 @ 1833 --- BrianR End of eruption
23383 24 Aug 2022 @ 1139 --- BrianR End of eruption
23365 23 Aug 2022 @ 1529 --- annelies8 off at this time
23367 23 Aug 2022 @ 1002 --- BrianR End of marathon eruption
23362 23 Aug 2022 @ 0657 --- BrianR Grotto in marathon from yesterday 13:44 eruption Marathon pool down Giant platform quiet
23350 22 Aug 2022 @ 1143 --- BrianR End of eruption
23343 21 Aug 2022 @ 1923 --- BrianR End of eruption
23310 21 Aug 2022 @ 1052 --- BrianR End of eruption
23289 20 Aug 2022 @ 0914 --- BrianR End of eruption
23287 20 Aug 2022 @ 0652 --- BrianR Grotto in marathon from yesterday 14:52 Giant platform quiet Marathon Pool down
23285 19 Aug 2022 @ 2112 --- BrandonC Still ie
23224 17 Aug 2022 @ 0715 --- JimS Ended within the last 5 minutes.
23197 15 Aug 2022 @ 1412 --- minissa Off, thinking this might have been a marathon, as Bijou has been off all the time we've been out here
23175 14 Aug 2022 @ 1017 --- Art Pressure pool up 1020 - Pressure pool down
23174 14 Aug 2022 @ 0915 --- Art Pressure pool up 0919 - Pressure Pool Down
23172 14 Aug 2022 @ 0827 --- Art Grotto off but light boil/blip from Grotto Fountain
23026 04 Aug 2022 @ 0934 --- dandersen Eruption ended before this time
22971 02 Aug 2022 @ 0744 --- JimS In a marathon. Bijou quiet, Marathon Pool low.
22908 28 Jul 2022 @ 1023 --- aferrara Grotto Off
22800 23 Jul 2022 @ 0544 --- JimS Quiet
22754 21 Jul 2022 @ 0645 --- JimS Quiet by this time.
22712 19 Jul 2022 @ 1701 --- nails Off at this time
22655 17 Jul 2022 @ 2115 --- RMichaels Still ie at this time.
22636 17 Jul 2022 @ 0633 --- BrianR I believe Grotto is still i.e. from yesterday’s eruption Marathon Pool down Bijou off Still i.e. when I left area at 12:30 The John’s formula for next eruption is: I=1.7D+190 minutes Last year I had a 24hr eruption, the next eruption began 2 hrs before the formula predicted
22619 16 Jul 2022 @ 1300 --- BrianR End of eruption
22618 16 Jul 2022 @ 0641 --- BrianR End of eruption
22595 15 Jul 2022 @ 1557 --- BrianR End of eruption
22586 15 Jul 2022 @ 0924 --- BrianR End of eruption
22579 14 Jul 2022 @ 1734 --- BrianR End of eruption
22559 14 Jul 2022 @ 1031 --- BrianR End of eruption
22554 13 Jul 2022 @ 1918 --- BrianR End of eruption
22536 13 Jul 2022 @ 1238 --- BrianR End of eruption
22535 13 Jul 2022 @ 0851 --- BrianR End of eruption
22531 12 Jul 2022 @ 1942 --- BrianR End of eruption
22515 12 Jul 2022 @ 1436 --- BrianR End of eruption
22509 12 Jul 2022 @ 0842 --- BrianR End of eruption
22489 11 Jul 2022 @ 1645 --- BrianR End of eruption
22486 11 Jul 2022 @ 1325 --- BrianR End of eruption
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
EntrySourceLinkComment
18 Aug 2020 @ 1452 JSJ https://www.youtube.com/watch?v=L4pz9gWnQwk Video by Craig Corless showing the start of Grotto Geyser's 2:52 PM-onward eruption on 18 August 2020, with both Grotto Fountain Geyser & South Grotto Fountain Geyser erupting in the background.
03 Oct 2019 @ 1526 EricZ https://www.youtube.com/watch?v=YpsAVShVyxs&feature=youtu.be Grotto Start
15 Aug 2018 @ 0941 JSJ https://www.flickr.com/photos/jsjgeology/32563168958 Photo of initial runoff (approaching Variable Spring) from Grotto Geyser's 9:41 AM-onward eruption on 15 August 2018.
15 Aug 2018 @ 0941 JSJ https://www.flickr.com/photos/jsjgeology/44618689690 Photo of Grotto Geyser's 9:41 AM-onward eruption on 15 August 2018.
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.