Last Known Eruption
1d 21h 5m ago

Latest Eruptions

Eruption DurationInterval
22 May 2024 @ 0702 ie wc>20h 42m 5h 56m
22 May 2024 @ 0106 wc1h 34m 6h 25m
21 May 2024 @ 1841 wc7h 57m
21 May 2024 @ 104419h 20m
20 May 2024 @ 1524 wc5h 49m
20 May 2024 @ 0935 ie20h 51m
19 May 2024 @ 1244 wc7h 38m
19 May 2024 @ 0506 wc1h 48m 14h 55m
18 May 2024 @ 14111d 21h 39m
16 May 2024 @ 1632 wc25h21m < d < 26h05m2d 10h 8m
14 May 2024 @ 0624 ie wc21h 57m
13 May 2024 @ 0827 ie wc1d 20h 21m
11 May 2024 @ 1206 ns5h 11m
11 May 2024 @ 0655 ie wc19h 6m
10 May 2024 @ 1149 wc3h 51m
10 May 2024 @ 0758 ie1d 11h 42m
08 May 2024 @ 2016 wc7h 4m
08 May 2024 @ 1312 ie wc>1h 43m 6h 54m
08 May 2024 @ 0618 ie wc20h 0m
07 May 2024 @ 1018 ie14h 38m
06 May 2024 @ 1940 ns wc1d 8h 40m
05 May 2024 @ 1100 ie14h 20m
04 May 2024 @ 2040 wc5h 44m
04 May 2024 @ 1456 ie5h 18m
04 May 2024 @ 0938 ie wc3h 52m
04 May 2024 @ 0546 ie wc1d 18h 53m
02 May 2024 @ 1053 ns wc5h 53m
02 May 2024 @ 0500 ie wc1d 22h 39m
30 Apr 2024 @ 0621 ie wc1d 44m
29 Apr 2024 @ 0537 ns wc15h 4m
28 Apr 2024 @ 14331d 5h 52m
27 Apr 2024 @ 0841 ie wc1d 23h 57m
25 Apr 2024 @ 0844 ie wc18h 21m
24 Apr 2024 @ 1423 ie1d 2h 31m
23 Apr 2024 @ 1152 ie wc21h 31m
22 Apr 2024 @ 1421 ie7h 30m
22 Apr 2024 @ 0651 ie wc16h 21m
21 Apr 2024 @ 1430 ie12h 40m
21 Apr 2024 @ 0150 wc11h 33m
20 Apr 2024 @ 1417 ie wc11h 5m
20 Apr 2024 @ 0312 ns wc14h 30m
19 Apr 2024 @ 1242 ie wc10h 58m
19 Apr 2024 @ 0144 ns wc1d 7h 16m
17 Apr 2024 @ 18281d 9h 54m
16 Apr 2024 @ 0834 ie wc1d 17h 30m
14 Apr 2024 @ 1504 wc2d 5h 36m
12 Apr 2024 @ 0928 ns wc22h 58m
11 Apr 2024 @ 1030 ie wc18h 45m
10 Apr 2024 @ 1545 ie wc2d 3h 39m
08 Apr 2024 @ 1206 ie wc1d 1h 13m
07 Apr 2024 @ 1053 ie wc2d 3h 33m
05 Apr 2024 @ 0720 ie wc1d 21h 57m
03 Apr 2024 @ 0923 ie wc18h 23m
02 Apr 2024 @ 1500 ie wc2d 22h 26m
30 Mar 2024 @ 1634 ns wc4h 49m
30 Mar 2024 @ 1145 ie wc20h 41m
29 Mar 2024 @ 1504 ns wc7h 59m
29 Mar 2024 @ 0705 ie wc17h 47m
28 Mar 2024 @ 1318 ie22h 30m
27 Mar 2024 @ 1448 ns wc1d 2h 31m
26 Mar 2024 @ 1217 ns wc2d 23h 22m
23 Mar 2024 @ 1255 ie wc8h 57m
23 Mar 2024 @ 0358 ns wc13h 10m
22 Mar 2024 @ 1448 wc≥2h43m5h 16m
22 Mar 2024 @ 0932 wc5h 44m
22 Mar 2024 @ 0348 ns wc13h 6m
21 Mar 2024 @ 1442 ie wc7h 53m
21 Mar 2024 @ 0649 ie wc1d 20h 1m
19 Mar 2024 @ 1048 ns wc16h 4m
18 Mar 2024 @ 1844 ie wc9h 14m
18 Mar 2024 @ 0930 ie wc21h 3m
17 Mar 2024 @ 1227 wc20h 51m
16 Mar 2024 @ 1536 wc5h 31m
16 Mar 2024 @ 1005 ie wc18h 40m
15 Mar 2024 @ 1525 ie wc>2h 8m 2d 21h 30m
12 Mar 2024 @ 1755 ie wc1d 8h 13m
11 Mar 2024 @ 0942 wc1d 14h 53m
09 Mar 2024 @ 1749 ie wc5h 10m
09 Mar 2024 @ 1239 wc1d 22h 15m
07 Mar 2024 @ 1424 ie wc6h 45m
07 Mar 2024 @ 0739 ie wc16h 54m
06 Mar 2024 @ 1445 ie wc4h 58m
06 Mar 2024 @ 0947 wc2d 21m
04 Mar 2024 @ 0926 ie wc4d 1h 10m
29 Feb 2024 @ 0816 ie wc2d 2h 32m
27 Feb 2024 @ 0544 wc7h 10m
26 Feb 2024 @ 2234 wc1h 25m 1d 22h 0m
25 Feb 2024 @ 0034 wc1d 3h 4m 6h 22m
24 Feb 2024 @ 1812 ns wc7h 11m
24 Feb 2024 @ 1101 ie wc6h 22m
24 Feb 2024 @ 0439 wc5h 52m
23 Feb 2024 @ 2247 wc1h 39m 5h 5m
23 Feb 2024 @ 1742 ns wc5h 4m
23 Feb 2024 @ 1238 ie wc11h 45m
23 Feb 2024 @ 0053 wc7h 12m
22 Feb 2024 @ 17411d 16h 39m
21 Feb 2024 @ 0102 ie wc4h 24m
20 Feb 2024 @ 2038 wc4h 51m
20 Feb 2024 @ 1547 wc56m 16h 47m
19 Feb 2024 @ 2300 wc5h49m < d < 7h13m9h 55m

Interval Statistics

Interval Count100
Min3h 51m
Max4d 1h 10m
Mean22h 14m
Median16h 34m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34597 17 May 2024 @ 1905 --- Mikemcc Grotto is off
34432 04 May 2024 @ 1253 04 May 2024 @ 1306 Janet Jones Grotto was firmly off.
34302 21 Apr 2024 @ 1516 --- SantaFe108 End of eruption. Little buddies came on strong after Rocket's eruption, but after one good surge from Rocket the whole system slowly wound down.
34216 19 Apr 2024 @ 1402 --- Mikemcc Grotto quit
34058 21 Feb 2024 @ 0903 --- JarnoO (wc) May still be ie from 0102ie (and has definitely been ie since 0903 as of writing). From overnight captures, ended around the 2254 Grand.
33826 16 Jan 2024 @ 1527 --- K.Cooper off.
33825 16 Jan 2024 @ 1512 --- K.Cooper restarted
33790 14 Jan 2024 @ 1455 --- K.Cooper had a good pressure pool with strong grotto fountain boiling. no water anywhere since as of 1549
32848 15 Dec 2023 @ 0955 --- Pholli quietly steaming
31056 23 Nov 2023 @ 0700 23 Nov 2023 @ 1330 MikeG Appeared to be off from sunrise until somewhere in middle of Giant's eruption.
31058 22 Nov 2023 @ 0650 22 Nov 2023 @ 1730 MikeG In eruption every time the webcam was pointed downbasin.
29395 03 Nov 2023 @ 1355 --- Delta4Heavy85 (Wc) Quiet
29358 02 Nov 2023 @ 1500 --- Delta4Heavy85 (Wc) Quiet
29203 29 Oct 2023 @ 1030 --- SantaFe108 End of eruption, quit right after I entered it ie.
28867 18 Oct 2023 @ 1614 --- Delta4Heavy85 (Wc) Quit
28831 17 Oct 2023 @ 0858 --- Delta4Heavy85 (Wc) Quiet, likely quit after the 0826 Rocket Major
28823 16 Oct 2023 @ 1236 --- Delta4Heavy85 (Wc) Quiet
28757 14 Oct 2023 @ 1249 --- Mikemcc Grotto ended at this time
28735 11 Oct 2023 @ 1845 --- Ben VL Still IE - another marathon. Either the same as last night's or the one after it.
28721 09 Oct 2023 @ 1605 --- aferrara ie, bijou dry, marathon pool down ~18" and boiling. Probably same eruption as this morning.
28603 01 Oct 2023 @ 1154 --- Mikemcc Grotto shut off at this time.
28528 28 Sep 2023 @ 1257 --- CraigC Grotto shut off
28508 27 Sep 2023 @ 1026 --- CraigC Grotto shut off
28507 27 Sep 2023 @ 0729 --- User34 Corner vent in steam, runoff channels trickling. Just turned off
28477 26 Sep 2023 @ 1205 --- CraigC Grotto shut off
28468 25 Sep 2023 @ 1231 --- Delta4Heavy85 (Wc) Quit 13m after the 1218 Rocket Major. D = 55m
28462 25 Sep 2023 @ 0920 --- CraigC Grotto shut off
28463 25 Sep 2023 @ 0758 --- CraigC Grotto ie
28438 24 Sep 2023 @ 1018 --- CraigC Grotto shut off
28424 23 Sep 2023 @ 1010 --- CraigC Grotto shut off
28362 20 Sep 2023 @ 1128 --- CraigC Grotto off
28342 19 Sep 2023 @ 1119 --- CraigC Grotto shut off
28337 19 Sep 2023 @ 0655 --- CraigC ie. possibly since last evening. Marathon Pool very very low, and boiling. Darcie noted Bijou off.
28207 11 Sep 2023 @ 0911 --- Colin_W Quiet
28161 09 Sep 2023 @ 2030 --- Ben VL Still ie at this time. Seems to be leaning towards a marathon.
28120 08 Sep 2023 @ 1444 --- CraigC Grotto shut off
28111 08 Sep 2023 @ 0921 --- CraigC Grotto shut off
28091 07 Sep 2023 @ 1429 --- CraigC Grotto shut off
28063 06 Sep 2023 @ 1736 --- CraigC Grotto shut off
27967 03 Sep 2023 @ 0650 --- CraigC Grotto was off when I arrived
27930 02 Sep 2023 @ 1050 --- CraigC Grotto turned off
27922 02 Sep 2023 @ 0852 --- CraigC Grotto turned off
27913 01 Sep 2023 @ 1752 --- CraigC Grotto turned off
27894 01 Sep 2023 @ 1036 --- CraigC Grotto turned off
27886 31 Aug 2023 @ 1455 --- Dan A Grotto is off
27869 30 Aug 2023 @ 1645 --- CraigC Grotto off
27866 30 Aug 2023 @ 1209 --- CraigC Grotto off
27848 29 Aug 2023 @ 1039 --- CraigC Grotto off
27829 28 Aug 2023 @ 1505 --- CraigC Grotto off
27820 28 Aug 2023 @ 0750 --- CraigC Grotto off
27813 27 Aug 2023 @ 0941 --- BrianR End of eruption
27798 26 Aug 2023 @ 1740 --- RMichaels Ended at this time.
27795 26 Aug 2023 @ 1512 --- BrianR End of eruption
27784 25 Aug 2023 @ 1926 --- BrianR End of eruption
27783 25 Aug 2023 @ 1510 --- BrianR End of eruption
27782 25 Aug 2023 @ 1056 --- BrianR End of eruption
27781 25 Aug 2023 @ 0711 --- BrianR End of eruption
27755 24 Aug 2023 @ 1422 --- BrianR End of eruption
27740 23 Aug 2023 @ 1724 --- BrianR End of eruption
27735 23 Aug 2023 @ 1236 --- BrianR End of eruption
27733 23 Aug 2023 @ 0809 --- BrianR End of eruption
27731 22 Aug 2023 @ 1758 --- BrianR End of eruption
27726 22 Aug 2023 @ 1436 --- BrianR End of eruption
27717 22 Aug 2023 @ 0933 --- BrianR End of eruption
27710 21 Aug 2023 @ 1547 --- BrianR End of eruption
27709 21 Aug 2023 @ 1059 --- BrianR End of eruption
27705 20 Aug 2023 @ 1830 --- BrianR End of eruption
27704 20 Aug 2023 @ 1400 --- BrianR End of eruption
27699 20 Aug 2023 @ 0830 --- BrianR End of eruption
27688 19 Aug 2023 @ 1639 --- BrianR End of eruption
27673 18 Aug 2023 @ 1900 --- BrianR Still i.e. when I left the area at 19:00, in marathon
27629 15 Aug 2023 @ 1530 15 Aug 2023 @ 1900 minissa Quiet, Bijou completely off, Marathon Pool refilling {about halfway at 1735}, nothing in Pressure Pool, no activity in Grotto Fountain. So assuming it's post marathon or other longish eruption
27617 15 Aug 2023 @ 1409 --- Ben VL Off by this time.
27543 12 Aug 2023 @ 2108 --- Ben VL Off by this time.
27527 11 Aug 2023 @ 1618 --- Dan A Off at this time
27488 10 Aug 2023 @ 0825 10 Aug 2023 @ 0830 aferrara Quit in this time window
27454 07 Aug 2023 @ 1509 --- Dan A Grotto off, no rocket
27416 05 Aug 2023 @ 1505 --- Mikemcc ended at this time
27314 29 Jul 2023 @ 1817 --- EmilyW Off at this time. Spa was high at 1440 and bijou off as well so this is likely the end of a prolonged eruption.
27225 25 Jul 2023 @ 1608 --- deanl ended by 1605 - another short eruption starting around 1509
27193 24 Jul 2023 @ 1230 --- deanl based on earlier Spa activity I believe Grotto is still in eruption from this morning and probably entering marathon
27158 23 Jul 2023 @ 1014 --- deanl ending at this time
27150 22 Jul 2023 @ 0948 --- JimS Quiet
27122 19 Jul 2023 @ 1157 --- deanl off at this time
27095 17 Jul 2023 @ 1435 --- deanl off now
27063 14 Jul 2023 @ 0556 --- dandersen Grotto off
27017 12 Jul 2023 @ 0828 --- Ben VL Off by now
26926 08 Jul 2023 @ 2113 --- Ben VL Looks like it's done when viewed from Grand. Probably quit within the last hour.
26904 08 Jul 2023 @ 0720 --- deanl changed my ie eruption to a note cuz it may have been a continuation of a marathon
26864 06 Jul 2023 @ 1421 --- JimS Quiet
26817 04 Jul 2023 @ 0858 --- Dan A Grotto is off
26762 01 Jul 2023 @ 1210 --- BrianR End of eruption
26761 01 Jul 2023 @ 0640 --- BrianR End of eruption
26752 30 Jun 2023 @ 1946 --- BrianR End of eruption
26748 30 Jun 2023 @ 1502 --- BrianR End of eruption
26743 30 Jun 2023 @ 0848 --- BrianR End of eruption
26732 29 Jun 2023 @ 1443 --- BrianR End of eruption
26730 29 Jun 2023 @ 0809 --- BrianR End of eruption
26724 28 Jun 2023 @ 1920 --- BrianR End of eruption
26711 28 Jun 2023 @ 1000 --- BrianR End of eruption
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.