Last Known Eruption
12h 19m ago
Predicted Next Eruption
Jul 23 at 2316 ± 120 minutes

Latest Eruptions

Eruption DurationInterval
23 Jul 2019 @ 120148m 10h 29m
23 Jul 2019 @ 0132 E10h 22m
22 Jul 2019 @ 151011h 39m
22 Jul 2019 @ 0331 E13h 39m
21 Jul 2019 @ 135215h 51m
20 Jul 2019 @ 2201 E9h 42m
20 Jul 2019 @ 121910h 17m
20 Jul 2019 @ 0202 E12h 58m
19 Jul 2019 @ 130410h 43m
19 Jul 2019 @ 0221 E10h 18m
18 Jul 2019 @ 160311h 10m
18 Jul 2019 @ 0453 E14h 10m
17 Jul 2019 @ 144311h 45m
17 Jul 2019 @ 0258 E11h 29m
16 Jul 2019 @ 152911h 31m
16 Jul 2019 @ 0358 E11h 6m
15 Jul 2019 @ 165210h 26m
15 Jul 2019 @ 0626 E11h 56m
14 Jul 2019 @ 18309h 21m
14 Jul 2019 @ 090912h 38m
13 Jul 2019 @ 203111h 2m
13 Jul 2019 @ 092911h 9m
12 Jul 2019 @ 2220 E11h 56m
12 Jul 2019 @ 10249h 54m
12 Jul 2019 @ 0030 E12h 3m
11 Jul 2019 @ 122710h 45m
11 Jul 2019 @ 0142 E12h 4m
10 Jul 2019 @ 133811h 21m
10 Jul 2019 @ 0217 E10h 42m
09 Jul 2019 @ 153511h 45m
09 Jul 2019 @ 0350 E18h 15m
08 Jul 2019 @ 0935 E9h 55m
07 Jul 2019 @ 2340 E11h 11m
07 Jul 2019 @ 122910h 43m
07 Jul 2019 @ 0146 E11h 26m
06 Jul 2019 @ 14209h 55m
06 Jul 2019 @ 0425 E11h 18m
05 Jul 2019 @ 17079h 55m
05 Jul 2019 @ 0712 ns12h 12m
04 Jul 2019 @ 190010h 49m
04 Jul 2019 @ 081112h 3m
03 Jul 2019 @ 200811h 32m
03 Jul 2019 @ 083611h 5m
02 Jul 2019 @ 2131 E10h 33m
02 Jul 2019 @ 105811h 2m
01 Jul 2019 @ 2356 E12h 17m
01 Jul 2019 @ 113910h 33m
01 Jul 2019 @ 0106 E9h 38m
30 Jun 2019 @ 152811h 37m
30 Jun 2019 @ 0351 E11h 27m
29 Jun 2019 @ 162412h 16m
29 Jun 2019 @ 0408 E10h 49m
28 Jun 2019 @ 171921h 26m
27 Jun 2019 @ 195311h 23m
27 Jun 2019 @ 083012h 2m
26 Jun 2019 @ 202811h 1m
26 Jun 2019 @ 092721h 56m
25 Jun 2019 @ 113110h 48m
25 Jun 2019 @ 0043 E10h 59m
24 Jun 2019 @ 134419h 57m
23 Jun 2019 @ 174715h 2m
23 Jun 2019 @ 0245 E11h 45m
22 Jun 2019 @ 150021h 35m
21 Jun 2019 @ 172510h 45m
21 Jun 2019 @ 0640 ie12h 0m
20 Jun 2019 @ 184010h 47m
20 Jun 2019 @ 0753 E10h 59m
19 Jun 2019 @ 205412h 51m
19 Jun 2019 @ 080314h 20m
18 Jun 2019 @ 17431d 2h 42m
17 Jun 2019 @ 150121h 2m
16 Jun 2019 @ 175911h 10m
16 Jun 2019 @ 0649 E9h 6m
15 Jun 2019 @ 214313h 41m
15 Jun 2019 @ 080213h 36m
14 Jun 2019 @ 182611h 42m
14 Jun 2019 @ 0644 ie13h 21m
13 Jun 2019 @ 17232d 5h 6m
11 Jun 2019 @ 121715h 54m
10 Jun 2019 @ 202310h 12m
10 Jun 2019 @ 101122h 14m
09 Jun 2019 @ 11571d 1h 40m
08 Jun 2019 @ 101710h 53m
07 Jun 2019 @ 2324 E11h 27m
07 Jun 2019 @ 11579h 14m
07 Jun 2019 @ 0243 E14h 28m
06 Jun 2019 @ 121510h 46m
06 Jun 2019 @ 0129 E11h 30m
05 Jun 2019 @ 135912h 58m
05 Jun 2019 @ 0101 E10h 51m
04 Jun 2019 @ 14109h 41m
04 Jun 2019 @ 0429 E11h 3m
03 Jun 2019 @ 172611h 10m
03 Jun 2019 @ 061611h 37m
02 Jun 2019 @ 183913h 24m
02 Jun 2019 @ 0515 E12h 30m
01 Jun 2019 @ 16459h 15m
01 Jun 2019 @ 073020h 32m
31 May 2019 @ 105822h 25m
30 May 2019 @ 123322h 4m

Interval Statistics

Interval Count100
Min9h 6m
Max2d 5h 6m
Mean13h 10m
Median11h 28m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
12560 22 Jul 2019 @ 1117 --- Barbara Lasseter Not in overflow
12521 19 Jul 2019 @ 0620 --- Barbara Lasseter Full to within 6-8inches of rim with low boil at north end
12512 18 Jul 2019 @ 0630 --- Barbara Lasseter Deep boiling with water visible only at the peak of the most vigorous boils
12500 16 Jul 2019 @ 0630 --- Barbara Lasseter Pool has refilled. Slight boil remains
12481 14 Jul 2019 @ 0750 --- Barbara Lasseter Overflow 0750
12480 14 Jul 2019 @ 0609 --- Barbara Lasseter Not in overflow
12462 13 Jul 2019 @ 0547 --- deanl Not in overflow yet
12254 05 Jul 2019 @ 0609 --- jkgood Light overflow
12101 04 Jul 2019 @ 0645 --- Barbara Lasseter Start of overflow. New prediction 0810 plus or minus 15 min
11904 21 Jun 2019 @ 0640 --- LynnS Very late in the eruption, thrashing around in the empty crater.
11889 19 Jun 2019 @ 1955 --- William in overflow when I arrived. ringed boil by 20:09.
11683 09 Jun 2019 @ 1024 --- LynnS Start of overflow
11653 08 Jun 2019 @ 0855 --- LynnS In early overflow; overflow coming out the east face but not trickling off first platform yet.
11639 07 Jun 2019 @ 2112 --- User34 Barely below overflow
11693 03 Jun 2019 @ 1726 --- Barbara Lasseter 74 minute overflow
11468 31 May 2019 @ 1956 31 May 2019 @ 2020 imapayne We arrived at great fountain around 1945 to a completely empty steaming crater. Standing on the benches, no water could be seen. At 1956, still no water. At 1957 the pool began to rise and by 2000 it was full and had a tiny trickle out the back, the pool held until 2011, but never really overflowed when it began to drop again. As it was late and the water was almost gone again, we decided to leave.
10278 18 Sep 2018 @ 1006 --- udo 724 victor announced prediction: 1240
10271 17 Sep 2018 @ 1645 --- ThomasR Post-eruptive, pool visible and sizzling at the edge.
10087 07 Sep 2018 @ 0930 --- Maureen VEC is now using 10 hr 45 m for middle of prediction window.
9886 26 Aug 2018 @ 0635 --- Barbara Lasseter first overflow
9884 26 Aug 2018 @ 0633 --- PamW Not in overflow.
9776 19 Aug 2018 @ 0650 19 Aug 2018 @ 0930 Glocho Maureen arrived this morning c. 06:50 and observed the end of Great Fountain. Gloria downloaded logger data at 9am with electronic eruption start time of 07:12. Since this directly contradicts Maureen's observation, I have removed this data point. The other data downloaded at the same time with the same device (08/18/18 1000E, 2021E) also did not match yesterday's observed eruptions, though I did download electronic times for yesterday and 8/17 PM through another device that appear to match.
9659 12 Aug 2018 @ 0720 --- Barbara Lasseter not yet in overflow
9625 11 Aug 2018 @ 0759 --- Barbara Lasseter 1st overflow
9591 10 Aug 2018 @ 0631 --- Barbara Lasseter within 2-3inches of rim
9503 07 Aug 2018 @ 0631 --- Barbara Lasseter boiling steam from deep in crater
9364 01 Aug 2018 @ 0754 --- rbwhitaker Well below overflow. Some small boiling on the north side.
9359 01 Aug 2018 @ 0636 --- Barbara Lasseter well below overflow, runoff channel dry
9338 31 Jul 2018 @ 0722 --- rbwhitaker Already in overflow when I arrived
9299 26 Jul 2018 @ 0101 --- billwarnock Maureen told me this afternoon that initial report of 0202E, which I posted this morning, was later determined to be 0101. She will post this time and this afternoon's eruption, which was around 1330, when she gets home.
9196 15 Jul 2018 @ 0605 --- Barbara Lasseter no visible water in crater. Runoff channel's wet.
9104 10 Jul 2018 @ 0936 --- udo NPS prediction 1845 via radio call on West repeater.
9094 10 Jul 2018 @ 0613 --- Micah Kipple In ovf
9073 08 Jul 2018 @ 2200 --- Kyle not in overflow
9035 05 Jul 2018 @ 0630 --- steve The morning eruption was finiished prior to 0630
8832 21 Jun 2018 @ 1200 --- Maureen Word from VEC is Firehole Lake Drive is open again!
8696 15 Jun 2018 @ 1238 15 Jun 2018 @ 1245 Maureen Initial overflow at 1238, that maintained until 1245, then dropped. Long false overflow.
8691 15 Jun 2018 @ 0832 --- DanS Post eruptive
8640 11 Jun 2018 @ 1920 --- DanS Not yet in overflow as of 1920
8612 09 Jun 2018 @ 2114 --- underarockphoto Overflow for 25m
8610 09 Jun 2018 @ 2100 --- Tara In early overflow. Left before eruption.
8585 09 Jun 2018 @ 0826 --- underarockphoto Near start of overflow
8526 07 Jun 2018 @ 1509 --- billwarnock In overflow; no boiling in center yet.
8536 07 Jun 2018 @ 1442 --- LynnS Start of overflow.
8504 06 Jun 2018 @ 0642 --- LynnS Start of overflow
8456 05 Jun 2018 @ 1130 --- billwarnock Great Fountain not yet in overflow.
8414 02 Jun 2018 @ 0945 --- Maureen Overflow start
8392 01 Jun 2018 @ 1250 --- LynnS Start of overflow
8376 31 May 2018 @ 1331 --- LynnS Already on overflow at 1331
8377 31 May 2018 @ 0515 --- LynnS Great Fountain had already finished its eruption.
8355 30 May 2018 @ 1612 --- geysergaze Overflow
8293 25 May 2018 @ 1130 --- Barbara Lasseter not in overflow
8318 25 May 2018 @ 1125 --- Kyle not in overflow and well below
7810 01 Nov 2017 @ 1105 --- billwarnock Great Fountain in early overflow.
7809 01 Nov 2017 @ 0957 --- billwarnock Not in overflow. Very windy day. Snow predicted around 1300.
7802 31 Oct 2017 @ 1310 --- billwarnock Great Fountain overflow started at about 1310
7794 29 Oct 2017 @ 0950 --- billwarnock In good overflow when I arrived.
7784 28 Oct 2017 @ 1019 --- udo About 6 inches below overflow but dropping.
7781 27 Oct 2017 @ 1202 --- DanS Not in overflow
7780 27 Oct 2017 @ 1008 --- DanS Not in overflow
7779 26 Oct 2017 @ 1825 --- DanS Looks normal post-eruptive.
7776 26 Oct 2017 @ 0925 --- udo Overflowing with boils appear to be continuing. Very doubtful that any eruptions have happened since the end of wild phase. It's still trying to recover. Runoff channels are flowing. The beach is dry where an eruption wave would have wetted it. 0944 dropping. 0957 overflow restarted. 1046 dropping. 1107 overflow restarted. 1126 dropping. 1141 overflow restarted. 1220 dropping. 1232 overflowing.
7770 25 Oct 2017 @ 1858 25 Oct 2017 @ 1930 DanS Still in overflow, boiling and crashing.
7769 25 Oct 2017 @ 1116 25 Oct 2017 @ 1722 billwarnock As Udo has noted, overflows today were accompanied by very strong boils, mainly around the rim. Overflow/heavy boils ranged from 22 to 29 minutes in duration, but the last two seen beginning at 1516 and 1645 lasted 32 and 37 minutes respectively. Durations of drops below overflow ranged between 12 and 15 minutes throughout this period. The last two drops the water wasn't visible. I still believe it had a large eruption overnight.
7754 25 Oct 2017 @ 1545 --- udo Pool is dropping with edge boils subsiding. Crashes are progressively getting deeper and taking longer to refill.
7755 25 Oct 2017 @ 1516 --- udo Overflow restarted with immediate boiling around edges. Again.
7756 25 Oct 2017 @ 1501 --- udo Pool is dropping with edge boils.
7753 25 Oct 2017 @ 1450 --- Janet White Boiling along edges like it’s ready to erupt but was told by Udo & Bill it’s been doing that for hours.
7757 25 Oct 2017 @ 1435 --- udo Overflow restarted.
7758 25 Oct 2017 @ 1417 --- udo Pool is dropping with edge boils continuing.
7759 25 Oct 2017 @ 1337 --- udo Pool is dropping with edge boils continuing.
7760 25 Oct 2017 @ 1310 --- udo Overflow and vigorous boiling restarted.
7761 25 Oct 2017 @ 1254 --- udo Pool is dropping with edge boils subsiding. Crash coming next I predict.
7762 25 Oct 2017 @ 1232 --- udo Overflow restarted with vigorous boiling.
7763 25 Oct 2017 @ 1215 --- udo Pool dropped below overflow again after vigorous edge boils subsided. Crashing at 1218.
7764 25 Oct 2017 @ 1154 --- udo Overflow with boiling restarted. Nearly hit a meter at 1155.
7765 25 Oct 2017 @ 1140 --- udo Crash!
7766 25 Oct 2017 @ 1116 --- udo Overflow and vigorous boiling has resumed after crashing. Nearly hit a meter at 1118 but not in the area where meter boil usually happens. Very odd.
7767 25 Oct 2017 @ 1101 --- udo Crashed to about a foot below overflow.
7768 25 Oct 2017 @ 1035 --- udo Nice boiling action. Upper terrace is overflowing into lower terrace and runoff channel. Runoff channels are flowing thru 2nd culvert and toward White Dome. Looks pre-eruptive. We'll see.
7750 24 Oct 2017 @ 1800 24 Oct 2017 @ 1940 DanS Still quietly in overflow. No edge boils yet. Departed at last light 1940, under quarter moon and big dipper. Coyote ambled by and crossed road at 1824.
7748 24 Oct 2017 @ 1613 24 Oct 2017 @ 1750 billwarnock Was in light overflow when I arrived. Also saw Fountain plume ie at 1613. Went to Flats to confirm & met Maureen. When we returned to GF after 1630 still in light overflow which increased until 1649 when pool dropped. Rises to overflow then slight drop continued until I left at 1750. Dan S still there.
7747 24 Oct 2017 @ 1700 --- Maureen Going in and out of overflow. Quick up and downs. No boils seen yet. Beautiful day in the LGB. So nice.
7741 24 Oct 2017 @ 1552 --- udo Overflow restarted. Unfortunately I must leave this.
7742 24 Oct 2017 @ 1539 --- udo 3rd overflow start. Stopped after 8 minutes.
7743 24 Oct 2017 @ 1525 --- udo 2nd overflow start. Lasted about 3 minutes and stopped.
7744 24 Oct 2017 @ 1510 --- udo Overflow started just orior to my arrivsl at 1510. Stopped after approx. 5 minutes. Did not crash.
7739 24 Oct 2017 @ 1344 24 Oct 2017 @ 1430 billwarnock Water in center pool now placid and about a foot below rim. Yesterday afternoon water not visible; boiling heard and lots of steam. During 45 minutes pool rose a little and fell a little 3 times, never quite reaching overflow. Will check back later.
7738 24 Oct 2017 @ 1350 --- DanS Still quiet.
7745 24 Oct 2017 @ 1240 --- udo Dry patches still exist and are enlarging. No overflows yet.
7735 23 Oct 2017 @ 1030 23 Oct 2017 @ 1545 udo No water visible in vent. Runoff channel near road had small areas of ice in it this morning. Upper terrace had dry spots this afternoon indicating it has not overflowed since wild phase eruptions ended.
7693 08 Oct 2017 @ 1115 --- Maureen Prediction guess of 1500 + - 60 min. Nice weather in the LGB.
7690 05 Oct 2017 @ 1010 --- Kitt B post eruptive
7682 02 Oct 2017 @ 1325 --- Kitt B start of overflow
7598 01 Oct 2017 @ 1535 --- Tara Per Maureen, Great Fountain prediction 1610-1640.
7597 01 Oct 2017 @ 1436 --- Kitt B Maureen doesn't expect Great Fountain until after 1600.
7468 27 Sep 2017 @ 1827 --- Tara Overflow started.
7298 25 Sep 2017 @ 0820 --- Barbara Lasseter overflow started
6494 16 Sep 2017 @ 0707 --- TSBryan Very late stages of eruption.
6289 12 Sep 2017 @ 0721 --- RLJones About 6 inches below overflow at 0721
EntrySourceLinkComment
30 May 2018 @ 1726 EricZ https://static-geysercam-xyz.nyc3.digitaloceanspaces.com/GreatFountainGeyser.mp4 Video taken by tourist Grant Arinder
26 Jul 2017 @ 1752 JSJ https://www.flickr.com/photos/jsjgeology/36237239410 Photo (out of 10) of Great Fountain Geyser's 5:52 PM-onward eruption on 26 July 2017.
03 Jun 2017 @ 1832 JSJ https://www.flickr.com/photos/jsjgeology/34985316630 Photo (out of 9) of Great Fountain Geyser's evening eruption on 3 June 2017.
02 Jun 2017 @ 1645 JSJ https://www.flickr.com/photos/jsjgeology/35205457072 Photo (out of 7) of Great Fountain Geyser's late afternoon eruption on 2 June 2017.
02 Jun 2017 @ 1645 JSJ https://www.youtube.com/watch?v=UL1mwSjv1RY Time lapse video of Great Fountain Geyser's late afternoon eruption on 2 June 2017.
13 Aug 2016 @ 2027 JSJ https://www.youtube.com/watch?v=esB95f0I52U Time lapse video of Great Fountain Geyser's evening eruption on 13 August 2016.
13 Aug 2016 @ 2027 JSJ https://www.flickr.com/photos/jsjgeology/30109996042 Photo (1 of 7) of Great Fountain Geyser's evening eruption on 13 August 2016.
10 Aug 2016 @ 2018 JSJ https://www.flickr.com/photos/jsjgeology/30224237115 Photo (1 of 24) of Great Fountain Geyser's evening eruption on 10 August 2016.
10 Aug 2016 @ 2018 JSJ https://www.flickr.com/photos/jsjgeology/29594675523 Thermal image (1 of 3) of Great Fountain Geyser's evening eruption on 10 August 2016.
10 Aug 2016 @ 2018 JSJ https://www.youtube.com/watch?v=t4LIaXxRt0s Time lapse video of Great Fountain Geyser's evening eruption on 10 August 2016.
08 Sep 2014 @ 1505 Micah Kipple https://www.flickr.com/photos/sgplewka/15604440267 flickr
06 Sep 2014 @ 2003 Micah Kipple https://www.flickr.com/photos/wildwood4est/15368309463 flickr
13 Sep 2014 @ 1411 Micah Kipple https://www.flickr.com/photos/digbydachshund/15940278098 flickr
02 Jun 2014 @ 1303 Micah Kipple https://www.flickr.com/photos/125791209@N06/16128797716 flickr
25 Sep 2014 @ 1725 Micah Kipple https://www.flickr.com/photos/hhayk/16012608917 Flickr
24 Sep 2014 @ 1907 Micah Kipple https://www.flickr.com/photos/rtsmithcpa/15187347577 Flickr
24 Sep 2014 @ 1907 Micah Kipple https://www.flickr.com/photos/rtsmithcpa/15187166390 Flickr photo
19 Sep 2012 @ 1502 Jake http://www.youtube.com/watch?v=B3bTX5OQUEY a visitor\'s excellent video with the blue bubble at the 3 minute mark
Baseline does not exist.


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