Last Known Eruption
5h 25m ago

Latest Eruptions

Eruption DurationInterval
26 Jul 2021 @ 093423.5m 22h 33m
25 Jul 2021 @ 110125.51d 2h 58m
24 Jul 2021 @ 080318.5m 18h 34m
23 Jul 2021 @ 132928m 21h 21m
22 Jul 2021 @ 160824m 23h 16m
21 Jul 2021 @ 165225m 20h 43m
20 Jul 2021 @ 200922m 1s 19h 9m
20 Jul 2021 @ 0100 A14h 19m
19 Jul 2021 @ 104125m 22h 29m
18 Jul 2021 @ 121229m 48s 1d 6h 53m
17 Jul 2021 @ 0519 ie22h 42m
16 Jul 2021 @ 063726m 40s 1d 28m
15 Jul 2021 @ 060925m 7s 20h 54m
14 Jul 2021 @ 0915~22m 23h 3m
13 Jul 2021 @ 101225m 37s 1d 53m
12 Jul 2021 @ 091928.5m 20h 24m
11 Jul 2021 @ 1255~25m 14h 49m
10 Jul 2021 @ 220624m 32s 22h 36m
09 Jul 2021 @ 2330 A17h 26m
09 Jul 2021 @ 060425m 16s 21h 21m
08 Jul 2021 @ 084326m 22h 54m
07 Jul 2021 @ 094924.5m 22h 32m
06 Jul 2021 @ 111726.5m 1d 1h 59m
05 Jul 2021 @ 091823m 23h 16m
04 Jul 2021 @ 10022d 28m
02 Jul 2021 @ 0934 ie wc19h 14m
01 Jul 2021 @ 1420~21m 17h 8m
30 Jun 2021 @ 2112~23m 15h 29m
30 Jun 2021 @ 0543 ie1d 2h 43m
29 Jun 2021 @ 0300 A16h 43m
28 Jun 2021 @ 101723h 43m
27 Jun 2021 @ 103424m 33s 1d 1h 36m
26 Jun 2021 @ 0858 ns1d 8h 28m
25 Jun 2021 @ 0030 A18h 34m
24 Jun 2021 @ 055629m 16s 20h 8m
23 Jun 2021 @ 0948~25m 23h 50m
22 Jun 2021 @ 0958~25m 22h 44m
21 Jun 2021 @ 1113:5624m 28s 1d 1h 29m
20 Jun 2021 @ 094432m 49s 1d 7h 14m
19 Jun 2021 @ 0230 A15h 40m
18 Jun 2021 @ 10501d 32m
17 Jun 2021 @ 1018 ie wc14h 18m
16 Jun 2021 @ 200024m 7s 22h 9m
15 Jun 2021 @ 2151 wc18h 21m
15 Jun 2021 @ 0330 A15h 48m
14 Jun 2021 @ 114221m 39s 19h 47m
13 Jun 2021 @ 1555 ie wc21h 51m
12 Jun 2021 @ 1804 ie wc1d 30m
11 Jun 2021 @ 1734 ie wc20h 47m
10 Jun 2021 @ 204728m 14s 1d 3h 25m
09 Jun 2021 @ 1722 ie wc20h 2m
08 Jun 2021 @ 212028m 12s 1d 4h 13m
07 Jun 2021 @ 1707~34m 1d 2h 15m
06 Jun 2021 @ 1452 ie17h 55m
05 Jun 2021 @ 205727m 48s 1d 21m
04 Jun 2021 @ 203625m 6s 17h 51m
04 Jun 2021 @ 0245 A1d 23h 45m
02 Jun 2021 @ 0300 A15h 56m
01 Jun 2021 @ 1104~23m 22h 57m
31 May 2021 @ 120726m 20s 23h 55m
30 May 2021 @ 121223m 21h 49m
29 May 2021 @ 142324m 23h 46m
28 May 2021 @ 1437 ie2d 4h 59m
26 May 2021 @ 0938 ie wc15h 8m
25 May 2021 @ 1830 ie1d 1h 12m
24 May 2021 @ 1718 ie wc21h 6m
23 May 2021 @ 2012 ie wc13h 58m
23 May 2021 @ 0613:30 ie5d 4h 28m
18 May 2021 @ 0145 A16h 25m
17 May 2021 @ 092027m 21s 19h 58m
16 May 2021 @ 132222m 56s 19h 49m
15 May 2021 @ 1733 ie2d 10h 11m
13 May 2021 @ 0722 ie22h 19m
12 May 2021 @ 0903 ie5d 23h 22m
06 May 2021 @ 0941 ie19h 16m
05 May 2021 @ 1425 ie1d 18h 20m
03 May 2021 @ 2005 ie wc2d 3h 4m
01 May 2021 @ 1701 ns wc2d 44m
29 Apr 2021 @ 1617 ie wc2d 22m
27 Apr 2021 @ 1555~24m 1d 7h 24m
26 Apr 2021 @ 0831 ie1d 16h 27m
24 Apr 2021 @ 1604 ie wc12h 34m
24 Apr 2021 @ 0330 A18h 7m
23 Apr 2021 @ 0923 ie wc23h 13m
22 Apr 2021 @ 101024m 18s 19h 19m
21 Apr 2021 @ 1451 ie13h 51m
21 Apr 2021 @ 0100 A21h 0m
20 Apr 2021 @ 0400 A1d 19h 52m
18 Apr 2021 @ 0808 ie wc22h 23m
17 Apr 2021 @ 094520m 19h 53m
16 Apr 2021 @ 1352 ns wc2d 4h 50m
14 Apr 2021 @ 0902 ns wc43d 23h 54m
01 Mar 2021 @ 0808 E1d 8h 23m
27 Feb 2021 @ 2345 E21h 12m
27 Feb 2021 @ 0233 E16h 43m
26 Feb 2021 @ 0950 E17h 5m
25 Feb 2021 @ 1645 E14h 37m
25 Feb 2021 @ 0208 E1d 7h 52m
23 Feb 2021 @ 1816 E16h 25m
23 Feb 2021 @ 0151 E15h 27m

Interval Statistics

Interval Count100
Min12h 34m
Max43d 23h 54m
Mean1d 12h 56m
Median22h 26m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
18097 25 Jun 2021 @ 2245 --- William did not erupt prior to this time.
17934 19 Jun 2021 @ 2100 --- WillBoekel no eruption yet
17750 13 Jun 2021 @ 1717 --- Craigmon99 2 feet below overflow
17661 11 Jun 2021 @ 0904 --- TheHikingDude High water, low boiling across the entire pool, about 2 inches from overflow
17466 04 Jun 2021 @ 2025 --- William high water
17464 04 Jun 2021 @ 1928 04 Jun 2021 @ 1955 William high water on arrival, dropped at 19:55
17365 02 Jun 2021 @ 0655 --- Mike C below overflow about 1 foot
15946 04 Sep 2020 @ 0004 --- BrandonC No eruption as of 0004
15924 31 Aug 2020 @ 1916 --- William water starting to rise
15893 29 Aug 2020 @ 1900 --- deanl water level was about 18-24" below overflow, so my guess is an eruption between 15 & 16:00.
15105 25 Jul 2020 @ 1950 --- William 1st overflow of sundress
14987 15 Jul 2020 @ 0600 15 Jul 2020 @ 0800 William No Arte overnight. high water at 07:10, low at 07:52
14752 28 Jun 2020 @ 0735 --- LynnS About 6-8 inches below the rim of the crater.
14739 26 Jun 2020 @ 1826 --- RLE Klammer Goose neck submerged as of 18:26
14713 22 Jun 2020 @ 1635 22 Jun 2020 @ 1833 RLE Klammer Pool at 16:35 was about 6-7 inches below rim. By 18:30, water was about 1 inch below rim, roughly estimate 1 1/2 inchs below gooseneck. No marmots.
13850 03 Oct 2019 @ 0728 --- RMichaels Pool looks like it has been in overflow for some time. Italy is full.
13848 02 Oct 2019 @ 1230 --- William Italy still down 1"
13687 14 Sep 2019 @ 0815 --- ThomasR Pool in overflow, but Little Italy not quite full yet. Possibly erupted around 0100 A.
13670 12 Sep 2019 @ 0800 12 Sep 2019 @ 1845 ThomasR No eruption during this time.
13655 12 Sep 2019 @ 0800 --- ThomasR No overnight eruption yet, pool is still overflowing.
13564 05 Sep 2019 @ 0630 05 Sep 2019 @ 0730 William No overnight eruption. Pushed around 07:15 but no eruption yet.
13532 04 Sep 2019 @ 0628 --- G$ Overflowing with Italy full. Does not appear to have erupted overnight
13506 02 Sep 2019 @ 1400 02 Sep 2019 @ 1845 Michael No eruption yet.
13483 01 Sep 2019 @ 0825 --- deanl erupted overnight - I'm guessing about 04:00
13459 30 Aug 2019 @ 0715 --- William Pool in overflow, most likely no overnight eruption.
13413 27 Aug 2019 @ 1000 --- ThomasR Had an overnight eruption. Pool was already in overflow, Little Italy was full, some other smaller pools weren’t full yet.
13353 22 Aug 2019 @ 1915 22 Aug 2019 @ 2100 William Pool full and water level high.
13345 22 Aug 2019 @ 0645 --- William Had overnight eruption. Pool is full, Italy 1 inch below rim.
13321 20 Aug 2019 @ 0710 20 Aug 2019 @ 0740 William Pool is high with gooseneck covered on pushes.
13304 18 Aug 2019 @ 0804 --- deanl Italy low and overflow into the "Creek". I'm guessing 02;00
13294 17 Aug 2019 @ 0414 --- JoeN looks to be in eruption, steam still seen as Grand erupted at 0424
13278 16 Aug 2019 @ 0605 --- RMichaels Pool is in high overflow.
13239 14 Aug 2019 @ 1655 --- minissa First OF . By which we mean first OF into pool on left of formation that is below pool shaped like a rough pentagon. Very close to OF into trapezoid pool next to horseshoe. End of Artemesia was 1346, so 3 hours 9 minutes from end of eruption to first OF, 3 hours 27 minutes from start of eruption to first OF. Hoping we can get a closed interval and compare OF length to total interval length. We have photos documenting progress low water to OF, will post
13232 14 Aug 2019 @ 1309 --- minissa Arrived about 20 minutes ago to find horseshoe and gooseneck well covered, some bubbles from point and to right of point
13221 13 Aug 2019 @ 2105 --- RMichaels Pool had been high for 30 min. before I left due to darkness. No eruption yet.
13200 12 Aug 2019 @ 2055 --- RMichaels Pool overflowing and cycling. No eruption yet.
13193 12 Aug 2019 @ 1615 12 Aug 2019 @ 1655 William nice overflow and runoff down back channels. Had two decent pushes that covered horseshoe and wet but did not cover the goose's body. Treeline channel wet and right channel flowing lightly.
13189 12 Aug 2019 @ 1031 --- RMichaels Start of overflow.
13188 12 Aug 2019 @ 0755 --- JoeN looked like Artemisia at 0252 on GOSA overnight which would agree with RM's note. With it being that dark it would be only a guess.
13187 12 Aug 2019 @ 0751 --- RMichaels Pool is about 8 inches below overflow. Likely erupted very early in the morning.
13150 10 Aug 2019 @ 1650 --- William post eruptive. pool down 1 1/2 to 2 feet from overflow and rising. Italy about 1/2" from rim.
13143 10 Aug 2019 @ 1105 --- RMichaels Pool in light overflow.
13089 07 Aug 2019 @ 0905 --- William had overnight eruption. pool is full with light overflow.
13041 05 Aug 2019 @ 0600 05 Aug 2019 @ 1300 William Arte being Arte... in moderate to heavy overflow at arrival with horseshoe and gooseneck covered throughout observation.
12800 26 Jul 2019 @ 0730 --- William No overnight eruption. pool in overflow with moderate runoff.
12787 23 Jul 2019 @ 1445 --- K.Cooper Something was erupting in this area at this time, however, it is unknown whether it was Atomizer or Artemisia
12566 23 Jul 2019 @ 0719 --- Casey An earlier post indicated an eruption at this time. An observation of the pool ~2 hours later seems to indicate a far earlier eruption.
12537 20 Jul 2019 @ 0830 20 Jul 2019 @ 0955 William Pool in overflow, horseshoe not yet covered upon arrival. water slightly better by end time but still light overflow.
12515 18 Jul 2019 @ 1215 18 Jul 2019 @ 2115 William in moderate overflow upon arrival. no eruption.
12458 12 Jul 2019 @ 2000 12 Jul 2019 @ 2045 William heavy overflow, gooseneck underwater during pushes.
12473 12 Jul 2019 @ 1530 --- ldgordon Overflowing
12417 09 Jul 2019 @ 1025 --- William Pool 6"-12" below overflow
12039 29 Jun 2019 @ 1756 29 Jun 2019 @ 1758 William Observed what appeared to be a false start. Pool in heavy overflow and water level was covering gooseneck when I heard 3 faint thumps and saw water level rise 1/2 inch. Boil began to intensify and seemed to teeter on eruption for about 1 minute. Pool began to drop after activity and settled about 1inch from highest water level point observed within 10-15 min.
11965 26 Jun 2019 @ 0730 26 Jun 2019 @ 0830 William Pool in light overflow.
11952 25 Jun 2019 @ 1015 25 Jun 2019 @ 1200 William moderate overflow.
11912 22 Jun 2019 @ 1455 22 Jun 2019 @ 1621 ldgordon No eruption, high fill that covered gooseneck and horseshoe from about 1555 - 1605. Water still seemed relatively high upon leaving
11909 22 Jun 2019 @ 0700 22 Jun 2019 @ 1045 William no overnight eruption. light/moderate overflow.
11900 21 Jun 2019 @ 1700 --- William no eruption yet. Pool in heavy overflow
11896 21 Jun 2019 @ 0925 21 Jun 2019 @ 0945 William Just at overflow.
11893 20 Jun 2019 @ 1345 --- William overflow still light
11892 20 Jun 2019 @ 1030 20 Jun 2019 @ 1100 William light overflow. lots of waves on pool due to wind but looks low.
11861 17 Jun 2019 @ 1750 --- William light overflow.
11808 15 Jun 2019 @ 0920 --- William Pool 2-3 inches below overflow.
11795 14 Jun 2019 @ 1800 14 Jun 2019 @ 2100 William heavy overflow when I arrived. no eruption.
11781 14 Jun 2019 @ 1010 --- Choward Not in overflow. Just starting to spill into basins on south side of the crater.
11764 13 Jun 2019 @ 1605 13 Jun 2019 @ 1615 William in light overflow.
11763 13 Jun 2019 @ 1318 --- Suzanne pool 1 foot below overflow
11751 12 Jun 2019 @ 1815 12 Jun 2019 @ 2045 William Upon first arrival the pool had risen since my earlier observation and was putting heavy water out of the front of the pool. moderate runoff down the right channel. Increased boil area throughout observation. Another beautiful sunset at Arti.
11743 12 Jun 2019 @ 1300 12 Jun 2019 @ 1355 William Pool full... light overflow. Slight improvement in water level and boil by end of observation.
11730 11 Jun 2019 @ 2010 11 Jun 2019 @ 2045 William pool full upon arrival with very little runoff in any direction. water level up considerably by 20:30 and overflowing out of the back two channels. very little water down the right runoff channel.
11720 10 Jun 2019 @ 1715 10 Jun 2019 @ 2110 William No eruption. pool in overflow when I arrived.
11668 08 Jun 2019 @ 1900 08 Jun 2019 @ 1950 William No eruption. In overflow.
11647 08 Jun 2019 @ 1315 --- William in light overflow.
11502 02 Jun 2019 @ 1130 02 Jun 2019 @ 1145 William Pool is full and sending water into the exterior formations. Little to no water runoff out of either back channel.
11485 01 Jun 2019 @ 1515 01 Jun 2019 @ 2100 William No eruption. Pool in heavy overflow out of both back runoff channels.
11465 01 Jun 2019 @ 0757 --- Mike C foot below overflow
11427 30 May 2019 @ 1100 --- William Pool not in overflow.
11423 30 May 2019 @ 0711 --- Mike C pool down about foot below overflow
11414 29 May 2019 @ 1041 --- EricZ very light overflow
10559 05 Oct 2018 @ 0745 --- William Pool full and in light overflow.
10474 25 Sep 2018 @ 2000 26 Sep 2018 @ 0000 ThomasR Had an overnight eruption sometime before midnight. Pool already overflowing and Little Italy already full when we arrived at 0830.
10452 25 Sep 2018 @ 1915 25 Sep 2018 @ 1950 William In heavy overflow.
10422 24 Sep 2018 @ 1900 24 Sep 2018 @ 1930 William In heavy overflow.
10421 24 Sep 2018 @ 1800 --- ThomasR No eruption yet when we left at 1800 Sep 24.
10420 23 Sep 2018 @ 1800 24 Sep 2018 @ 0000 ThomasR Had an eruption overnight between 1800 and 0000. No eruption yet when we left at 1800 Sep 23. Pool full and overflowing when we arrived at 0800 Sep 24.
10301 19 Sep 2018 @ 1640 --- Tara About 18 inches below overflow.
10055 06 Sep 2018 @ 0833 --- EmilyW Did not erupt overnight. Pool full and overflowing
9975 01 Sep 2018 @ 0715 --- RMichaels Full and overflowing.
9698 13 Aug 2018 @ 1340 --- minissa In OF. At high end of cycle, horseshoe fairly well covered, although not completely. Trickle of water into middle OF channel R side of formation
9495 06 Aug 2018 @ 1440 --- Stephen_Gemar Not quite in overflow.
8591 08 Jun 2018 @ 0555 08 Jun 2018 @ 1620 LynnS Artemisia overflow was audible in both channels and heavy steam in the runoff channel that goes over the brink of the hill when I arrived. Conditions were still the same when I left at 1620.
8387 01 Jun 2018 @ 1444 --- EricZ pool full, but not overflowing
8364 31 May 2018 @ 0848 --- donnielg Big steam cloud seen from Daisy at 08:48.
8356 30 May 2018 @ 1900 --- Mike C pool down about 4 feet
8346 30 May 2018 @ 0746 --- B**2 About 1 ft below overflow.
7982 21 Apr 2018 @ 1215 --- RMichaels Pool full and in overflow.
7976 20 Apr 2018 @ 1630 20 Apr 2018 @ 1700 RMichaels In overflow.
6330 13 Sep 2017 @ 0756 --- Mike C pool down about 1 foot
6288 12 Sep 2017 @ 0734 --- Mike C Just about to overflow
6247 09 Sep 2017 @ 2105 --- Dave W Still full and overflowing when I left at 2105. No eruption yet.
EntrySourceLinkComment
05 Sep 2019 @ 0910 Michael https://darksky.net/details/44.4618,-110.8369/2019-9-05/us12/en Weather on 2019-09-05 at Old Faithful, WY according to Dark Sky Time Machine
27 Jul 2019 @ 0702 Michael https://darksky.net/details/44.4618,-110.8369/2019-7-27/us12/en Weather on 2019-07-27 at Old Faithful, WY according to Dark Sky Time Machine
10 Aug 2019 @ 0727 Michael https://darksky.net/details/44.4618,-110.8369/2019-8-10/us12/en Weather on 2019-08-10 at Old Faithful, WY according to Dark Sky Time Machine
05 Sep 2019 @ 0910 Michael https://youtu.be/N_1tIxoKIaU?t=1094 Old Faithful Geyser Streaming Webcam Capture of 2019-09-05 @ 0911:56
27 Jul 2019 @ 0702 Michael https://youtu.be/P7HwyIOtUpU?t=1522 Old Faithful Geyser Streaming Webcam Capture of 2019-07-27 @ 0654:00
10 Aug 2019 @ 0727 Michael https://youtu.be/NuegRYu7l1g?t=446 Old Faithful Geyser Streaming Webcam Capture of 2019-08-10 @ 0724:34
16 May 2015 @ 1141 JSJ https://www.flickr.com/photos/jsjgeology/18179663412 Photo (1 of 19) of Artemisia Geyser's 11:41 AM to 12:08 PM eruption on 16 May 2015.
14 Aug 2014 @ 1154 JSJ https://www.flickr.com/photos/jsjgeology/15465524472 Photo (1 of 6) of Artemisia Geyser's 11:54 to 12:18 PM eruption on 14 August 2014.
01 Sep 2012 @ 1453 JSJ https://www.youtube.com/watch?v=GM2_GU13R0w Video by Will Boekel of Artemisia Geyser's 2:53 to 3:21 PM eruption on 1 September 2012.
14 Aug 2014 @ 1154 JSJ https://www.youtube.com/watch?v=qAQZfQVyU98 Video of Artemisia Geyser's 11:54 AM to 12:18 PM eruption on 14 August 2014.
16 May 2015 @ 1141 JSJ https://www.youtube.com/watch?v=s-NNSHy25Qw Video of Artemisia Geyser's 11:41 AM to 12:08 PM eruption on 16 May 2015.
21 Aug 2014 @ 2033 kcmule http://www.coloradobills.com/yellowstone/ART2033.08212014.flv
Baseline does not exist.