Last Known Eruption
3h 13m ago

Latest Eruptions

Eruption DurationInterval
26 Jul 2021 @ 0925 ie3h 48m
26 Jul 2021 @ 0537 ie14h 16m
25 Jul 2021 @ 15218h 30m
25 Jul 2021 @ 06516h 21m
25 Jul 2021 @ 0030 wc12h 35m
24 Jul 2021 @ 11558h 7m
24 Jul 2021 @ 0348 wc7h 19m
23 Jul 2021 @ 20298h 32m
23 Jul 2021 @ 11571h 34m 17h 55m
22 Jul 2021 @ 18027h 55m
22 Jul 2021 @ 10071h 51m 1d 18h 29m
20 Jul 2021 @ 15381d 27m 6h 22m
20 Jul 2021 @ 09163h 3m 4h 41m
20 Jul 2021 @ 0435 ie7h 43m
19 Jul 2021 @ 2052 ie4h 24m
19 Jul 2021 @ 16281h 1m 5h 46m
19 Jul 2021 @ 10423h 13m 5h 4m
19 Jul 2021 @ 0538 ie7h 18m
18 Jul 2021 @ 2220 ns wc4h 43m
18 Jul 2021 @ 17372h 7m 4h 16m
18 Jul 2021 @ 13211h 37m 4h 58m
18 Jul 2021 @ 08232h 45m 16h 25m
17 Jul 2021 @ 15581h 57m 6h 10m
17 Jul 2021 @ 094816h 30m
16 Jul 2021 @ 17186h 31m
16 Jul 2021 @ 104719h 2m
15 Jul 2021 @ 15458h 0m
15 Jul 2021 @ 07452h 15m 14h 35m
14 Jul 2021 @ 17107h 38m
14 Jul 2021 @ 09321d 2h 47m
13 Jul 2021 @ 0645 ie14h 32m
12 Jul 2021 @ 1613 wc4h 24m
12 Jul 2021 @ 1149 ie wc5h 16m
12 Jul 2021 @ 0633 ie18h 3m
11 Jul 2021 @ 12305h 39m
11 Jul 2021 @ 0651 ie8h 3m
10 Jul 2021 @ 2248 ie7h 36m
10 Jul 2021 @ 15128h 18m
10 Jul 2021 @ 065416h 6m
09 Jul 2021 @ 14485h 24m
09 Jul 2021 @ 09241d 3h 23m
08 Jul 2021 @ 0601 ie12h 14m
07 Jul 2021 @ 1747 ie wc5h 3m
07 Jul 2021 @ 1244 ie5h 17m
07 Jul 2021 @ 0727 ns14h 17m
06 Jul 2021 @ 1710 ns3d 7h 53m
03 Jul 2021 @ 0917 ie3h 32m
03 Jul 2021 @ 0545 ie18h 17m
02 Jul 2021 @ 1128 ie5h 58m
02 Jul 2021 @ 0530 ie9h 54m
01 Jul 2021 @ 19361d 9h 25m
30 Jun 2021 @ 1011 ie1d 49m
29 Jun 2021 @ 0922 ie18h 38m
28 Jun 2021 @ 14443h 26m
28 Jun 2021 @ 1118 ie5h 29m
28 Jun 2021 @ 054913h 47m
27 Jun 2021 @ 16021h 37m
27 Jun 2021 @ 1425 ie4h 51m
27 Jun 2021 @ 0934 ns12h 25m
26 Jun 2021 @ 210910h 49m
26 Jun 2021 @ 1020 ns17h 20m
25 Jun 2021 @ 17006h 21m
25 Jun 2021 @ 1039 ie4h 11m
25 Jun 2021 @ 0628 ie11h 18m
24 Jun 2021 @ 1910 ie22h 30m
23 Jun 2021 @ 2040 ie1d 13h 30m
22 Jun 2021 @ 0710 ns7h 22m
21 Jun 2021 @ 2348 wc8h 10m
21 Jun 2021 @ 15387h 1m
21 Jun 2021 @ 0837 ie wc22h 56m
20 Jun 2021 @ 09414h 9m
20 Jun 2021 @ 0532 ie1d 23h 51m
18 Jun 2021 @ 0541 ie6h 38m
17 Jun 2021 @ 2303 wc5h 32m
17 Jun 2021 @ 17317h 31m
17 Jun 2021 @ 1000 ie18h 1m
16 Jun 2021 @ 15595h 28m
16 Jun 2021 @ 1031 ie4h 51m
16 Jun 2021 @ 0540 ie6h 41m
15 Jun 2021 @ 2259 wc5h 53m
15 Jun 2021 @ 1706 ie6h 16m
15 Jun 2021 @ 10504h 45m
15 Jun 2021 @ 0605 ie11h 59m
14 Jun 2021 @ 1806 wc5h 28m
14 Jun 2021 @ 12385h 24m
14 Jun 2021 @ 071411h 58m
13 Jun 2021 @ 1916 ie5h 13m
13 Jun 2021 @ 14032h 11m 6h 18m
13 Jun 2021 @ 0745 ns13h 19m
12 Jun 2021 @ 1826 ns5h 2m
12 Jun 2021 @ 13247h 23m
12 Jun 2021 @ 0601 ie18h 29m
11 Jun 2021 @ 11323h 20m 14h 52m
10 Jun 2021 @ 2040 ie wc9h 26m
10 Jun 2021 @ 1114 ie3h 41m
10 Jun 2021 @ 073313h 28m
09 Jun 2021 @ 1805 wc3h 55m
09 Jun 2021 @ 14106h 22m
09 Jun 2021 @ 07481h 20m 13h 4m
08 Jun 2021 @ 1844 wc10h 8m

Interval Statistics

Interval Count100
Min1h 37m
Max3d 7h 53m
Mean11h 31m
Median7h 37m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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
17789 14 Jun 2021 @ 1947 --- Craigmon99 Off after rocket at this time
17787 14 Jun 2021 @ 1806 --- William steam in the area, near start... probably grotto?
17766 14 Jun 2021 @ 0905 --- CraigC Grotto shut off between 0845 and 0905
17756 13 Jun 2021 @ 2004 --- K.Cooper (wc) Grotto still ie at this time
17748 13 Jun 2021 @ 1614 --- CraigC Grotto shut off
17715 12 Jun 2021 @ 1443 --- CraigC grotto off
17696 12 Jun 2021 @ 1003 --- CraigC central vents splashing
17688 12 Jun 2021 @ 0722 --- CraigC Grotto shut off
17678 11 Jun 2021 @ 0843 --- TheHikingDude Grotto off, no sign of water on the entire platform. Calm as can be. Spa was 2 feet below the rim.
17654 11 Jun 2021 @ 0713 --- CraigC good energy cycle in Grotto, water barely visible in pressure pool at Grotto Ftn
17652 11 Jun 2021 @ 0638 --- CraigC marathon pool about 8 inches down
17590 08 Jun 2021 @ 1700 08 Jun 2021 @ 1835 annelies8 No eruption between these times that I saw, although from 1725 on I was dividing attention between this and Riverside. Not sure if it hasn't gone yet or I missed it earlier.
17541 07 Jun 2021 @ 2058 --- Craigmon99 still ie
17505 06 Jun 2021 @ 1128 06 Jun 2021 @ 1210 Polly Grotto marathon end sometime between 1128 and 1210.
17498 06 Jun 2021 @ 0630 --- CraigC Grotto ie., Marathon Pool appears about 4 inches below high water mark
17470 05 Jun 2021 @ 0850 --- CraigC Grotto off, observed from F&M
17243 29 May 2021 @ 0000 --- JarnoO (wc) Marathon continued overnight; Overnight captures: 0025, 0100, 0157, 0256. May have quit somewhere between 0256 and 0615. At first glance only passive steam rising at the latter time.
17232 28 May 2021 @ 1940 --- Ben VL Still IE when I left for Grand at this time.
17228 28 May 2021 @ 1300 --- JarnoO (wc) Marathon. Still ie 1300 (as well as seen ie somewhere around 1145), 1420, 1500, 1600, 1725, 1809, 1856, 1950. Daytime & overnight captures: 2100, 2200, 2300.
17224 28 May 2021 @ 0954 --- gobysmith still in eruption
16819 23 Jan 2021 @ 0954 --- RangerRebecca Grotto off but emitting steam. Audible thuds or thumping; like steam bubbles collapsing in an empty chamber.
16808 13 Jan 2021 @ 1501 --- JarnoO (wc) ie at this time; not known if continuation of 0849ns
16500 03 Nov 2020 @ 1206 --- TheHikingDude Grotto appears off at this time.
16472 28 Oct 2020 @ 1412 --- Janet Jones Off. No steam rising or water heard. Steam rising in Grotto Fountain, but hard to see any water level.
16459 27 Oct 2020 @ 0031 --- TheHikingDude ie at this time via webcam. Still not sure if a new eruption or a continuations of the ones from 9:01 or 16:46 the previous day.
16456 26 Oct 2020 @ 1646 --- JarnoO (wc) ie at this time and later. Not sure if continuation of 0901ie or separate eruption
16448 21 Oct 2020 @ 0830 --- William off at this time, appears that it may have quit recently as it is still huffing steam and all runoff channels are wet.
16447 20 Oct 2020 @ 0730 20 Oct 2020 @ 1830 William off at 07:30 and also off at 18:30. Did not observe in between these times.
16440 17 Oct 2020 @ 0712 --- William looks to be on at this time, closest view I got was from TB platform
16508 16 Oct 2020 @ 1240 --- jonp Everything quiet at 12:40
16434 15 Oct 2020 @ 1840 15 Oct 2020 @ 1915 William turned off during this time.
16433 15 Oct 2020 @ 1725 --- TheHikingDude still ie as of 17:25, presumably a marathon.
16426 14 Oct 2020 @ 1640 --- jonp Grotto off at this time
16424 14 Oct 2020 @ 1618 --- TheHikingDude in ie as of 16:18, leaving as a note due to still being in possible marathon from this morning.
16418 13 Oct 2020 @ 0735 --- William ie at this time. Not sure if this is a continuation from last evenings eruption or a new eruption started overnight.
16416 12 Oct 2020 @ 1152 --- TheHikingDude Grotto off at this time.
16405 10 Oct 2020 @ 1600 --- steve Grotto may be in marathon; Bijou is barely spritzing and there is no water in Mastiff.
16355 06 Oct 2020 @ 1918 --- K.Cooper (wc) Still ie at 1918. Continuing eruption.
16307 29 Sep 2020 @ 1700 --- Art Grotto off
16290 27 Sep 2020 @ 1434 27 Sep 2020 @ 1439 William high water push, GF to 2' ending in central vent splashing.
16289 27 Sep 2020 @ 1423 27 Sep 2020 @ 1425 William high water in pool, 1' splashing in GF, no real push from Grotto
16287 27 Sep 2020 @ 1350 27 Sep 2020 @ 1354 William central vents delay. strong push from grotto, 1' splashing from GF
16285 27 Sep 2020 @ 1311 27 Sep 2020 @ 1314 William Central vents on, no water visible in pressure pool, some splashing in GF.
16246 24 Sep 2020 @ 1905 24 Sep 2020 @ 1935 William Grotto ie at this time, may still be ie from morning eruption
16214 20 Sep 2020 @ 1831 20 Sep 2020 @ 2000 William after being quiet all day after this morning's eruption water was visible in the pressure pool at 18:31 along with light splashing in Grotto Fountain. Same at 19:17. left for Grand but did not see steam to indicate an eruption prior to 20:00
16182 18 Sep 2020 @ 1920 --- JarnoO (wc) Appears to have quit some time before 1920. Have seen it ie continuously throughout the day.
16185 18 Sep 2020 @ 1752 --- Ben VL Off by this time.
16164 18 Sep 2020 @ 0736 --- CraigC still ie
16180 18 Sep 2020 @ 0453 --- Graham ie, believe a continuation from yesterdays eruption.
16083 12 Sep 2020 @ 1041 --- TheHikingDude grotto off
16072 11 Sep 2020 @ 1855 --- William grotto complex quiet
16018 07 Sep 2020 @ 1845 07 Sep 2020 @ 1956 William ie during this time, assumed to be still ie from this mornings eruption.
15958 04 Sep 2020 @ 1650 --- CraigC Grotto off
15956 04 Sep 2020 @ 1320 --- TheHikingDude grotto off
15950 04 Sep 2020 @ 0940 --- TheHikingDude Grotto off
15936 02 Sep 2020 @ 1623 --- CraigC grotto off
15920 31 Aug 2020 @ 1421 --- CraigC end of eruption
15890 29 Aug 2020 @ 1350 --- BrianR End of eruption
15773 28 Aug 2020 @ 1853 --- BrianR End of eruption
15754 27 Aug 2020 @ 1831 --- BrianR Still ie when I left area
15733 26 Aug 2020 @ 1837 --- JarnoO (wc) Been ie at all times since we panned away from Giantess and the Hill for short times after about noon or so. Not sure if this is a continuation of 0700ie eruption or a separate one.
15729 25 Aug 2020 @ 1109 --- BrianR End of eruption
15725 24 Aug 2020 @ 1915 --- BrianR End of eruption
15723 24 Aug 2020 @ 1211 --- BrianR End of eruption
15716 23 Aug 2020 @ 1611 --- BrianR End of eruption
15715 22 Aug 2020 @ 1124 --- 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.