Last Known Eruption
5h 45m ago
Predicted Next Eruption
Sep 21 at 0230 ± 120 minutes

Latest Eruptions

Eruption DurationInterval
20 Sep 2019 @ 1515 A9h 40m
20 Sep 2019 @ 0535 E13h 4m
19 Sep 2019 @ 163110h 15m
19 Sep 2019 @ 0616 E10h 13m
18 Sep 2019 @ 200311h 14m
18 Sep 2019 @ 084911h 15m
17 Sep 2019 @ 213414h 13m
17 Sep 2019 @ 072111h 1m
16 Sep 2019 @ 2020 E10h 33m
16 Sep 2019 @ 094713h 22m
15 Sep 2019 @ 202511h 48m
15 Sep 2019 @ 083713h 2m
14 Sep 2019 @ 193513h 39m
14 Sep 2019 @ 0556 E13h 38m
13 Sep 2019 @ 161810h 20m
13 Sep 2019 @ 0558 E12h 44m
12 Sep 2019 @ 171410h 52m
12 Sep 2019 @ 0622 E10h 20m
11 Sep 2019 @ 2002 E11h 41m
11 Sep 2019 @ 0821 E13h 19m
10 Sep 2019 @ 1902 E14h 59m
10 Sep 2019 @ 0403 E25m 12h 0m
09 Sep 2019 @ 160311h 41m
09 Sep 2019 @ 0422 E11h 36m
08 Sep 2019 @ 1646 E8h 26m
08 Sep 2019 @ 082010h 40m
07 Sep 2019 @ 2140 E12h 37m
07 Sep 2019 @ 090310h 19m
06 Sep 2019 @ 2244 E10h 34m
06 Sep 2019 @ 121010h 29m
06 Sep 2019 @ 0141 E11h 17m
05 Sep 2019 @ 142411h 32m
05 Sep 2019 @ 0252 E10h 45m
04 Sep 2019 @ 160711h 31m
04 Sep 2019 @ 043610h 23m
03 Sep 2019 @ 181310h 11m
03 Sep 2019 @ 0802 ns10h 35m
02 Sep 2019 @ 2127 E11h 15m
02 Sep 2019 @ 101213h 19m
01 Sep 2019 @ 205312h 0m
01 Sep 2019 @ 085313h 57m
31 Aug 2019 @ 185611h 0m
31 Aug 2019 @ 075611h 9m
30 Aug 2019 @ 2047 E13h 6m
30 Aug 2019 @ 074110h 30m
29 Aug 2019 @ 2111 E11h 6m
29 Aug 2019 @ 100510h 29m
28 Aug 2019 @ 2336 E12h 36m
28 Aug 2019 @ 110010h 30m
28 Aug 2019 @ 0030 ns11h 41m
27 Aug 2019 @ 124910h 34m
27 Aug 2019 @ 0215 E9h 28m
26 Aug 2019 @ 1647 E12h 38m
26 Aug 2019 @ 0409 E12h 47m
25 Aug 2019 @ 152212h 12m
25 Aug 2019 @ 0310 E11h 16m
24 Aug 2019 @ 15549h 54m
24 Aug 2019 @ 0600 E10h 5m
23 Aug 2019 @ 195510h 47m
23 Aug 2019 @ 090812h 54m
22 Aug 2019 @ 201411h 11m
22 Aug 2019 @ 090310h 29m
21 Aug 2019 @ 223414h 42m
21 Aug 2019 @ 075212h 45m
20 Aug 2019 @ 1907 E9h 11m
20 Aug 2019 @ 095610h 16m
19 Aug 2019 @ 2340 E10h 46m
19 Aug 2019 @ 125412h 1m
19 Aug 2019 @ 0053 E8h 26m
18 Aug 2019 @ 162710h 56m
18 Aug 2019 @ 0531 E13h 0m
17 Aug 2019 @ 163113h 20m
17 Aug 2019 @ 0311 E9h 34m
16 Aug 2019 @ 173710h 25m
16 Aug 2019 @ 071211h 47m
15 Aug 2019 @ 192510h 40m
15 Aug 2019 @ 084515h 26m
14 Aug 2019 @ 171911h 28m
14 Aug 2019 @ 0551 E11h 23m
13 Aug 2019 @ 182810h 46m
13 Aug 2019 @ 0742 E11h 45m
12 Aug 2019 @ 195711h 20m
12 Aug 2019 @ 0837 E10h 42m
11 Aug 2019 @ 2155 E13h 42m
11 Aug 2019 @ 081310h 33m
10 Aug 2019 @ 2140 E10h 51m
10 Aug 2019 @ 10499h 58m
10 Aug 2019 @ 0051 E11h 4m
09 Aug 2019 @ 134710h 46m
09 Aug 2019 @ 0301 E13h 35m
08 Aug 2019 @ 1326 E14h 47m
07 Aug 2019 @ 2239 E10h 49m
07 Aug 2019 @ 115012h 34m
06 Aug 2019 @ 2316 E9h 22m
06 Aug 2019 @ 135410h 18m
06 Aug 2019 @ 0336 E10h 55m
05 Aug 2019 @ 16419h 46m
05 Aug 2019 @ 0655 E9h 57m
04 Aug 2019 @ 2058 E9h 33m
04 Aug 2019 @ 112514h 5m

Interval Statistics

Interval Count100
Min8h 26m
Max15h 26m
Mean11h 27m
Median11h 7m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
13750 19 Sep 2019 @ 0815 --- Barbara Lasseter Heavy noisy boiling in crater sometimes reaching top of crater. Runoff channels holding water
13715 16 Sep 2019 @ 0835 --- Barbara Lasseter First overflow
13709 15 Sep 2019 @ 1919 --- William first overflow
13699 15 Sep 2019 @ 0730 --- Barbara Lasseter First overflow
13677 13 Sep 2019 @ 0745 --- Barbara Lasseter 31 & foggy. No overflow. Audible boiling in the crater
13669 12 Sep 2019 @ 1544 --- Maureen Overflow start
13632 09 Sep 2019 @ 0710 --- Barbara Lasseter Mostly refilled. Still a little boiling at the edge
13626 08 Sep 2019 @ 0707 --- Barbara Lasseter First overflow
13623 07 Sep 2019 @ 2014 --- William no overflow by this time.
13585 05 Sep 2019 @ 1312 --- William first overflow
13541 04 Sep 2019 @ 1545 --- mhvogel One of co-workers told me the wrong overnight eruption time of GF. According to the Bluetooth download, the eruption time was 0440 which matches up with the dude that saw it at 0436. Sorry for the confusion.
13546 04 Sep 2019 @ 1306 --- mdschwarz Not in overflow. Parking lot full.
13496 01 Sep 2019 @ 1936 --- geysergaze Overflow 1936
13457 29 Aug 2019 @ 2029 --- steve Great Fountain was already in overflow. Start time unknown but the area of steaming water was still close to the main vent
13448 29 Aug 2019 @ 0856 --- steve First overflow, after a quick rise.
13440 28 Aug 2019 @ 0951 --- Maureen Overflow start.
13369 23 Aug 2019 @ 1840 --- Maureen Overflow start.
13360 23 Aug 2019 @ 0754 --- Maureen Overflow start.
13352 22 Aug 2019 @ 1840 --- William had not reached overflow at this time
13317 19 Aug 2019 @ 1135 --- Maureen Overflow start.
13311 18 Aug 2019 @ 1508 --- Maureen Overflow start.
13291 16 Aug 2019 @ 1634 --- William 1st overflow
13276 15 Aug 2019 @ 1812 --- William 1st overflow
13176 11 Aug 2019 @ 1945 --- minissa 1-2" from overflow, did not stay to confirm OF
13132 09 Aug 2019 @ 1356 09 Aug 2019 @ 1428 JSJ Inclinometer readings: highest water during 1st series about 81 feet; 2nd series about 59 feet; 3rd series about 45 feet.
12820 27 Jul 2019 @ 0618 --- Barbara Lasseter Overflow 0618
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 Jones 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.
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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