Last Known Eruption
1d 51m ago

Latest Eruptions

Eruption DurationInterval
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
22 Feb 2021 @ 1024 E1d 5h 48m
21 Feb 2021 @ 0436 E22h 22m
20 Feb 2021 @ 0614 E18h 55m
19 Feb 2021 @ 1119 E18h 0m
18 Feb 2021 @ 1719 E1d 7h 13m
17 Feb 2021 @ 1006 E1d 2h 1m
16 Feb 2021 @ 0805 E1d 4h 35m
15 Feb 2021 @ 0330 E23h 16m
14 Feb 2021 @ 0414 E1d 3h 49m
13 Feb 2021 @ 0025 E21h 44m
12 Feb 2021 @ 0241 E15h 37m
11 Feb 2021 @ 1104 E19h 24m
10 Feb 2021 @ 1540 E22h 0m
09 Feb 2021 @ 1740 E23h 58m
08 Feb 2021 @ 1742 E1d 2h 55m
07 Feb 2021 @ 1447 E20h 53m
06 Feb 2021 @ 1754 E15h 50m
06 Feb 2021 @ 0204 E20h 8m
05 Feb 2021 @ 0556 E14h 31m
04 Feb 2021 @ 1525 E1d 4h 55m
03 Feb 2021 @ 1030 E17h 30m
02 Feb 2021 @ 1700 E21h 39m
01 Feb 2021 @ 1921 E21h 13m
31 Jan 2021 @ 2208 E21h 10m
31 Jan 2021 @ 0058 E1d 21h 38m
29 Jan 2021 @ 0320 E12h 2m
28 Jan 2021 @ 1518 E17h 12m
27 Jan 2021 @ 2206 E1d 9h 41m
26 Jan 2021 @ 1225 E16h 21m
25 Jan 2021 @ 2004 E19h 29m
25 Jan 2021 @ 0035 E17h 7m
24 Jan 2021 @ 0728 E20h 53m
23 Jan 2021 @ 1035 ie wc2h 59m
23 Jan 2021 @ 0736 E19h 13m
22 Jan 2021 @ 1223 E18h 52m
21 Jan 2021 @ 1731 E17h 33m
20 Jan 2021 @ 2358 E18h 32m
20 Jan 2021 @ 0526 E16h 53m
19 Jan 2021 @ 1233 E1d 1h 8m
18 Jan 2021 @ 1125 E1d 6h 25m
17 Jan 2021 @ 0500 E1d 2h 29m
16 Jan 2021 @ 0231 E18h 23m
15 Jan 2021 @ 0808 E1d 4h 13m
14 Jan 2021 @ 0355 E1d 4h 58m
12 Jan 2021 @ 2257 E17h 56m
12 Jan 2021 @ 0501 E17h 22m
11 Jan 2021 @ 1139 E23h 59m
10 Jan 2021 @ 1140 E22h 40m
09 Jan 2021 @ 1300 E10d 11h 59m
30 Dec 2020 @ 0101 E13h 10m
29 Dec 2020 @ 1151 E14h 8m
28 Dec 2020 @ 2143 E13h 29m
28 Dec 2020 @ 0814 E22h 46m
27 Dec 2020 @ 0928 E1d 5h 59m
26 Dec 2020 @ 0329 E16h 57m
25 Dec 2020 @ 1032 E11h 50m
24 Dec 2020 @ 2242 E1d 2h 38m
23 Dec 2020 @ 2004 E1d 15h 48m
22 Dec 2020 @ 0416 E12h 39m
21 Dec 2020 @ 1537 E11h 21m
21 Dec 2020 @ 0416 E12h 31m
20 Dec 2020 @ 1545 E1d 3h 26m
19 Dec 2020 @ 1219 E1d 20m
18 Dec 2020 @ 1159 E1d 40m
17 Dec 2020 @ 1119 E11h 17m
17 Dec 2020 @ 0002 E12h 56m
16 Dec 2020 @ 1106 E1d 1h 16m
15 Dec 2020 @ 0950 E22h 5m
14 Dec 2020 @ 1145 E12h 58m
13 Dec 2020 @ 2247 E20h 45m
13 Dec 2020 @ 0202 E1d 8h 47m
11 Dec 2020 @ 1715 E19h 5m
10 Dec 2020 @ 2210 E22h 20m
09 Dec 2020 @ 2350 E1d 36m
08 Dec 2020 @ 2314 E23h 25m
07 Dec 2020 @ 2349 E19h 4m
07 Dec 2020 @ 0445 E19h 53m
06 Dec 2020 @ 0852 E1d 3h 11m
05 Dec 2020 @ 0541 E1d 1h 45m
04 Dec 2020 @ 0356 E1d 1h 18m
03 Dec 2020 @ 0238 E15h 49m
02 Dec 2020 @ 1049 E23h 54m
01 Dec 2020 @ 1055 E1d 4h 28m
30 Nov 2020 @ 0627 E13h 39m
29 Nov 2020 @ 1648 E21h 43m
28 Nov 2020 @ 1905 E19h 18m
27 Nov 2020 @ 2347 E21h 47m
27 Nov 2020 @ 0200 E1d 1h 28m

Interval Statistics

Interval Count100
Min2h 59m
Max43d 23h 54m
Mean1d 10h 23m
Median21h 12m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
6174 09 Sep 2017 @ 1145 --- Dave W In overflow
5883 06 Sep 2017 @ 0655 --- RMichaels Artemisia is full and overflowing, but appears to have erupted sometime overnight.
5879 05 Sep 2017 @ 1835 --- RMichaels In overflow.
5797 05 Sep 2017 @ 0638 --- RMichaels Pool about 2.5 feet below overflow. Appears to have erupted recently.
5684 04 Sep 2017 @ 0654 --- RMichaels 6 inches below overflow.
5677 03 Sep 2017 @ 1541 --- JudyS full with overflow
5571 02 Sep 2017 @ 0918 --- c.barwin post eruptive... about a foot below the rim.
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.