Last Known Eruption
24m ago

Interval Statistics

Interval Count100
Min1h 52m
Max232d 20h 54m
Mean4d 22h 6m
Median19h 28m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
39663 05 Jun 2025 @ 1618 --- minissa Uh... Several {I saw 4} surges that I expected to be recording as an eruption but... Uh... Nope
39405 27 May 2025 @ 1341 --- User34 Steam increased after Slot, single splash from an empty crater
38831 04 May 2025 @ 1516 --- K.Cooper empty
38726 01 May 2025 @ 1314 --- rayceanderson Water came up and then dropped during Slot’s eruption
38466 18 Apr 2025 @ 1142 --- SantaFe108 Low and lightly bubbling, water clear.
38307 24 Feb 2025 @ 1604 --- K.Cooper 4im below overflow. calm. clear of bacteria
38102 25 Dec 2024 @ 1428 25 Dec 2024 @ 1505 aferrara 1428-empty, 1441- visible water, occasionally weak bubbling, Drained as a tivity increased in slot until no water seen by ~1505
38089 25 Dec 2024 @ 1031 --- K.Cooper empty
38054 21 Dec 2024 @ 0957 --- mhreed Water visible but low from standing on bench; lazy bubbling.
38026 17 Dec 2024 @ 0736 --- K.Cooper low and probably dormant
37782 27 Oct 2024 @ 1150 --- Janet Jones Below overflow but with bubbles rising regularly.
37511 10 Oct 2024 @ 1449 --- SantaFe108 Low and cold.
34448 05 May 2024 @ 1514 --- SantaFe108 Overflowing and bubbling.
34296 21 Apr 2024 @ 1132 --- SantaFe108 Just below overflow.
34221 19 Apr 2024 @ 1735 --- SantaFe108 In overflow and bubbling.
34073 27 Feb 2024 @ 0636 --- JarnoO Not seen on the overnights at all, even in clear weather. Guess it really doesn't like snow.
33947 29 Jan 2024 @ 0900 --- JarnoO Has recovered from the long (>4h) intervals during the daytime hours of January 27. Seems even 3h00m±15m would suffice now.
33929 26 Jan 2024 @ 1130 --- JarnoO Plate's intervals have abruptly lengthened overnight compared to the currently typical 3h00m±30m, starting with 0026 wc (I=4h06m), previous interval ±3h29m (it could be argued that that one was the start of the lengthening - the one before was ±3h at most given the unclosed interval). The next one, 0435 wc, had an interval of 4h09m and the most recent one of 5h36m. Could be it's nearing the end of an active phase, not to be seen for days to weeks. Given past intervals, it appears certain it's done that repeatedly since reactivation early 2022, so it's not out of the ordinary.
33870 18 Jan 2024 @ 1320 --- K.Cooper bubbles
33855 17 Jan 2024 @ 1550 --- K.Cooper bubbles no overflow
33814 16 Jan 2024 @ 0750 --- K.Cooper erupted recently
33760 07 Jan 2024 @ 1706 --- Graham Erupted between now and 1520. Pool down now.
29209 29 Oct 2023 @ 1235 --- SantaFe108 Overflowing but not bubbling.
28809 15 Oct 2023 @ 1112 --- SantaFe108 Overflowing with really small bubbling.
28668 07 Oct 2023 @ 1212 --- Dan A Bubbling now
28665 07 Oct 2023 @ 1112 --- SantaFe108 Overflowing but not bubbling yet.
28647 05 Oct 2023 @ 1904 05 Oct 2023 @ 2000 Ben VL Bubbling as I passed by. No eruption by the time I left the hill around 2000. Guessing it's in the 'bubbling for hours' mode.
28263 15 Sep 2023 @ 1514 --- Dan A Bubbling
28260 15 Sep 2023 @ 0702 --- K.Cooper just below overflow
28216 11 Sep 2023 @ 1516 --- K.Cooper starting overflow no bubbles
28206 11 Sep 2023 @ 0828 --- K.Cooper in overflow and bubbling
28194 10 Sep 2023 @ 1607 --- K.Cooper strong overflow and lots of bubbles
28163 10 Sep 2023 @ 0618 --- K.Cooper well below overflow
28139 09 Sep 2023 @ 0926 --- K.Cooper Just starting overflow over
28112 08 Sep 2023 @ 1147 --- Ben VL Bubbling
27945 02 Sep 2023 @ 1532 --- SantaFe108 Overflowing out the back, not bubbling at this time.
27909 01 Sep 2023 @ 1534 --- Graham in overflow and bubbling
27681 19 Aug 2023 @ 0930 --- RMichaels Overflowing and bubbling.
27669 18 Aug 2023 @ 1600 18 Aug 2023 @ 1800 RMichaels Overflowing and bubbling throughout this period and probably longer.
27559 13 Aug 2023 @ 1430 --- aferrara Bubbling, slightly turbid water
27353 31 Jul 2023 @ 1311 --- Dan A Has been bubbling for over 3 hours with no eruption, bubbling had nearly stopped at one point, have never observed this before
27333 30 Jul 2023 @ 1300 --- Dan A Overflowing and bubbling
27275 28 Jul 2023 @ 1657 --- Dan A In strong overflow and bubbling
27274 28 Jul 2023 @ 1454 --- Dan A Overflowing but not bubbling
27267 27 Jul 2023 @ 1729 --- RMichaels Overflowing but not bubbling.
27253 27 Jul 2023 @ 0722 --- SantaFe108 Overflowing and bubbling.
26956 09 Jul 2023 @ 0835 --- RMichaels Overflowing and bubbling.
26918 08 Jul 2023 @ 2022 --- RMichaels Overflowing and bubbling.
26907 08 Jul 2023 @ 1640 --- RMichaels Overflowing and bubbling.
26883 07 Jul 2023 @ 1726 --- Dan A Overflowing and bubbling
26865 06 Jul 2023 @ 1519 --- Dan A Overflowing and bubbling
26855 05 Jul 2023 @ 1024 --- Dan A In overflow and bubbling
26790 02 Jul 2023 @ 1049 --- Graham Water visible well down in the crater. Likely erupted this morning.
26767 01 Jul 2023 @ 1235 --- Ben VL In overflow
26611 23 Jun 2023 @ 0807 --- Forestbewithyou Plate is post eruptive
26465 19 Jun 2023 @ 1136 --- Graham Below overflow.
26155 08 Jun 2023 @ 1222 --- Graham In light overflow.
25829 28 May 2023 @ 0619 --- Graham Below overflow.
25826 27 May 2023 @ 1951 --- User34 Just below overflow. Bubbling
25750 24 May 2023 @ 1638 --- SantaFe108 Bubbling in-progress.
25673 21 May 2023 @ 1801 --- SantaFe108 Beginning of bubbling.
25644 21 May 2023 @ 1356 --- Dan A In overflow and bubbling
25608 20 May 2023 @ 1923 --- SantaFe108 Pool is recovering from eruption and is now ~5 inches below overflow.
25600 20 May 2023 @ 1759 --- SantaFe108 Began bubbling at this time.
25598 20 May 2023 @ 1738 --- SantaFe108 Lightly overflowing.
25409 12 May 2023 @ 1512 --- Janet Jones No microbes seen in the vent. Overflowing lightly.
25269 23 Apr 2023 @ 1600 --- SantaFe108 Full and hot.
23912 19 Sep 2022 @ 1024 --- Tara hot, down a few inches
23182 14 Aug 2022 @ 1527 --- Tara full, hot, and convecting, probably 2-3" higher than it was on 8/11/22
21192 06 May 2022 @ 2048 --- Tara hot and overflowing
17503 06 Jun 2021 @ 1035 --- Tara pool quiet, light ring of pale orange bacteria around edges
16496 31 Oct 2020 @ 1111 --- Janet Jones Low water level - full of brownish orange microbes.
10986 19 Apr 2019 @ 0927 --- udo Very dark bacteria growth = cooled considerably from last fall. sad.
10300 16 Sep 2018 @ 1340 --- Siegmund Full to the brim, brown bacteria in crater.
8550 01 Jun 2018 @ 2028 01 Jun 2018 @ 2200 Siegmund Quietly overflowing.
8129 09 May 2018 @ 0916 --- udo Plate has heated up and is now clear. Orange bacteria seen weeks ago is gone.
4826 07 Aug 2017 @ 1741 --- JSJ Plate Geyser's basin was water-filled and overflowing.
4428 09 Jul 2017 @ 1239 --- udo 1st doming bubbles seen
4098 16 May 2017 @ 1354 --- Betty Plate or Slot ie, but I never know which one it is
2959 03 Jun 2016 @ 1240 --- JSJ Plate Geyser's basin is water-filled.
2814 04 May 2016 @ 1330 --- udo Overflowing with small ripples.
2797 29 Apr 2016 @ 1323 --- Siegmund Overflowing. Algae only at edges of crater and in runoff channel (in contrast to opening weekend when the crater itself was orange)
2748 17 Apr 2016 @ 1534 --- mhreed Full with orange bacteria in crater.
110 17 Feb 2012 @ 0000 17 Feb 2012 @ 2359 ofcarolyn quite a bit of steam today, couldn\'t be sure of water
15303 13 Oct 1996 @ 1427 --- JarnoO overflowing
14395 28 Sep 1995 @ 1520 --- JarnoO overflow
14281 05 Feb 1995 @ 1630 --- JarnoO not before 1630
12737 08 Sep 1994 @ 2000 08 Sep 1994 @ 2009 JarnoO 20:0x
12643 02 May 1994 @ 1304 02 May 1994 @ 1354 JarnoO 13:x4
12355 22 Dec 1993 @ 1600 22 Dec 1993 @ 1609 JarnoO 16:0x ie
12320 21 Sep 1993 @ 1130 21 Sep 1993 @ 1139 JarnoO 11:3x
5675 28 Aug 1992 @ 1800 28 Aug 1992 @ 1859 JarnoO 18:xx
5429 09 Jul 1992 @ 2100 09 Jul 1992 @ 2159 JarnoO 21:xx
Baseline does not exist.