Last Known Eruption
9d 4h 3m ago

Latest Eruptions

Eruption DurationInterval
11 Jan 2021 @ 1430 ie10h 33m
11 Jan 2021 @ 0357 E10h 48m
10 Jan 2021 @ 1709 E10h 23m
10 Jan 2021 @ 0646 E12h 31m
09 Jan 2021 @ 1815 E9h 45m
09 Jan 2021 @ 0830 E12h 2m
08 Jan 2021 @ 2028 E9h 30m
08 Jan 2021 @ 1058 E12h 14m
07 Jan 2021 @ 2244 E11h 44m
07 Jan 2021 @ 1100 E11h 32m
06 Jan 2021 @ 2328 E9h 57m
06 Jan 2021 @ 1331 E9h 16m
06 Jan 2021 @ 0415 E10h 48m
05 Jan 2021 @ 1727 E13h 42m
05 Jan 2021 @ 0345 E10h 36m
04 Jan 2021 @ 1709 E10h 8m
04 Jan 2021 @ 0701 E11h 43m
03 Jan 2021 @ 1918 E11h 20m
03 Jan 2021 @ 0758 E11h 26m
02 Jan 2021 @ 2032 E10h 8m
02 Jan 2021 @ 1024 E11h 5m
01 Jan 2021 @ 2319 E11h 3m
01 Jan 2021 @ 1216 E10h 19m
01 Jan 2021 @ 0157 E12h 8m
31 Dec 2020 @ 1349 E10h 50m
31 Dec 2020 @ 0259 E9h 54m
30 Dec 2020 @ 1705 E9h 52m
30 Dec 2020 @ 0713 E11h 8m
29 Dec 2020 @ 2005 E11h 41m
29 Dec 2020 @ 0824 E10h 56m
28 Dec 2020 @ 2128 E10h 4m
28 Dec 2020 @ 1124 E9h 53m
28 Dec 2020 @ 0131 E13h 32m
27 Dec 2020 @ 1159 E11h 5m
27 Dec 2020 @ 0054 E10h 31m
26 Dec 2020 @ 1423 E9h 9m
26 Dec 2020 @ 0514 E11h 32m
25 Dec 2020 @ 1742 E9h 30m
25 Dec 2020 @ 0812 E11h 35m
24 Dec 2020 @ 2037 E9h 59m
24 Dec 2020 @ 1038 E10h 26m
24 Dec 2020 @ 0012 E11h 49m
23 Dec 2020 @ 1223 E10h 59m
23 Dec 2020 @ 0124 E13h 55m
22 Dec 2020 @ 1129 E9h 20m
22 Dec 2020 @ 0209 E10h 43m
21 Dec 2020 @ 1526 E13h 14m
21 Dec 2020 @ 0212 E11h 9m
20 Dec 2020 @ 1503 E10h 44m
20 Dec 2020 @ 0419 E10h 16m
19 Dec 2020 @ 1803 E12h 37m
19 Dec 2020 @ 0526 E9h 52m
18 Dec 2020 @ 1934 E13h 38m
18 Dec 2020 @ 0556 E14h 31m
17 Dec 2020 @ 1525 E10h 42m
17 Dec 2020 @ 0443 E8h 19m
16 Dec 2020 @ 2024 E12h 23m
16 Dec 2020 @ 0801 E11h 31m
15 Dec 2020 @ 2030 E11h 33m
15 Dec 2020 @ 0857 E45d 17h 36m
30 Oct 2020 @ 1621 E9h 20m
30 Oct 2020 @ 0701 E12h 37m
29 Oct 2020 @ 1824 E10h 49m
29 Oct 2020 @ 0735 E10h 46m
28 Oct 2020 @ 2049 E11h 19m
28 Oct 2020 @ 0930 E11h 22m
27 Oct 2020 @ 2208 E9h 57m
27 Oct 2020 @ 1211 E15h 15m
26 Oct 2020 @ 2056 E10h 12m
26 Oct 2020 @ 1044 E11h 5m
25 Oct 2020 @ 2339 E13h 10m
25 Oct 2020 @ 1029 E10h 20m
25 Oct 2020 @ 0009 E13h 44m
24 Oct 2020 @ 1025 E10h 29m
23 Oct 2020 @ 2356 E10h 18m
23 Oct 2020 @ 1338 E10h 16m
23 Oct 2020 @ 0322 E9h 35m
22 Oct 2020 @ 1747 E13h 38m
22 Oct 2020 @ 0409 E12h 10m
21 Oct 2020 @ 15599h 19m
21 Oct 2020 @ 0640 E11h 35m
20 Oct 2020 @ 1905 E16h 48m
20 Oct 2020 @ 0217 E12h 37m
19 Oct 2020 @ 1340 E13h 20m
19 Oct 2020 @ 0020 E15h 0m
18 Oct 2020 @ 0920 ns10h 42m
17 Oct 2020 @ 2238 E11h 15m
17 Oct 2020 @ 1123 E12h 52m
16 Oct 2020 @ 2231 E11h 25m
16 Oct 2020 @ 1106 E11h 1m
16 Oct 2020 @ 0005 E10h 31m
15 Oct 2020 @ 1334 E11h 29m
15 Oct 2020 @ 0205 E13h 52m
14 Oct 2020 @ 121313h 14m
13 Oct 2020 @ 2259 E13h 47m
13 Oct 2020 @ 091211h 51m
12 Oct 2020 @ 2121 E11h 13m
12 Oct 2020 @ 1008 E13h 48m
11 Oct 2020 @ 2020 E11h 36m
11 Oct 2020 @ 0844 E14h 0m

Interval Statistics

Interval Count100
Min8h 19m
Max45d 17h 36m
Mean22h 17m
Median11h 8m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
16422 14 Oct 2020 @ 1120 --- am Heavy overflow
16385 10 Oct 2020 @ 0743 --- steve No eruption yet this morning.
16382 09 Oct 2020 @ 1830 --- Art Pool full with visible boil up to 1-2’ from the south end of pool. Visitors stated no eruption since they had been observing (~20 minutes)
16381 09 Oct 2020 @ 1700 --- Art Still ie. Saw several large bursts with water falling outside of crater.
16379 09 Oct 2020 @ 1342 --- steve Quick rise and overflow again at 1342. This time it stayed up.
16378 09 Oct 2020 @ 1300 --- steve In overflow again at 1300 and dropped just below overflow a few minutes later. Then several minutes after that it crashed.
16377 09 Oct 2020 @ 1238 --- steve It went into overflow at 1238, but dropped out of overflow a couple of minutes later.
16332 05 Oct 2020 @ 1005 --- steve First overflow at about 1005 after a fast rise.
16329 04 Oct 2020 @ 1625 --- User34 Large crowd, low pool (couldn't tell if it was boiling or not), and still water on terraces. Not in overflow yet?
16315 01 Oct 2020 @ 1701 --- mhvogel I want to give all of the geyser enthusiasts a heads up. Beginning today, October 1, the NPS will no longer be predicting Great Fountain for the rest of the year. Half of our staff has left and we don't have enough people on our staff to go to the other basins and get geyser data. I will personally get GF and Fountain data when I have time. We will resume GF predictions beginning in May of next year. However, I will continue to post GF and Fountain E times on Geysertimes.
16288 27 Sep 2020 @ 1246 --- am In overflow when I arrived
16281 27 Sep 2020 @ 0921 --- DanS Not in overflow
15989 05 Sep 2020 @ 1640 --- jkgood Beginning of overflow
15944 03 Sep 2020 @ 1830 --- CraigC start of overflow
15902 30 Aug 2020 @ 1920 --- CraigC start of overflow. 1936 dropped, out of overflow. Back in overflow at 1942
15626 17 Aug 2020 @ 0955 --- Skippyphoto bubbling visible around rim.
15625 17 Aug 2020 @ 0950 --- Skippyphoto sound of overflow started.
15615 16 Aug 2020 @ 1948 --- CraigC start of overflow
15540 12 Aug 2020 @ 1809 --- LynnS Great Fountain start of overflow
15518 11 Aug 2020 @ 1744 --- CraigC in overflow
15151 02 Aug 2020 @ 1405 --- aferrara Nearly in overflow at 1330, water level more than 1ft below overflow when I returned at 1405
15110 26 Jul 2020 @ 1545 --- CraigC in overflow per observer
15070 21 Jul 2020 @ 1525 --- CraigC in overflow per Byron
15061 21 Jul 2020 @ 0627 --- CraigC already in overflow
15058 20 Jul 2020 @ 1822 --- William 1st overflow
15043 20 Jul 2020 @ 0650 --- CraigC 650 pool crashed, 718 in overflow
15040 19 Jul 2020 @ 1909 --- CraigC 2nd 1927 to 1932. 3rd 1941 to 1947. 4th 1956 to 2002. 5th 2009 to 2017
15039 19 Jul 2020 @ 1753 --- CraigC started overflow
14986 14 Jul 2020 @ 1715 --- CraigC already in overflow when I arrived
14965 13 Jul 2020 @ 0524 13 Jul 2020 @ 0602 LynnS From 0524 until about 0600 Great Fountain was in the post-eruptive state where it periodically splashedup water without ejecting water from the crater (coning activity that does not reflect expenditure of energy and is not included in calculations of duration based prediction models), but had not quite entered the post-eruptive state where the pool fills to a few inches below overflow, then boils for awhile (stage 1 of Tomas Vachuda’s quiet period.) About 0600 the coning started to turn to activity that looked more like boiling around the edges of and the pool level, although several inches below the rim, was visible (stage 1 of Vachuda’s quiet period).
14894 06 Jul 2020 @ 1350 --- CraigC in overflow
14889 05 Jul 2020 @ 1545 --- LynnS Already in overflow.
14879 04 Jul 2020 @ 1845 --- CraigC in overflow
14813 30 Jun 2020 @ 1305 --- User34 Seemed very close to overflow, or in early overflow
14724 24 Jun 2020 @ 1350 --- William 1st overflow
14695 20 Jun 2020 @ 0549 --- LynnS Great Fountain in very early overflow; water has not yet started trickling off the first terrace.
14657 17 Jun 2020 @ 1705 --- LynnS Not yet in overflow
14638 14 Jun 2020 @ 1542 --- aferrara Fairly high water level ~1530 dropped ~1' below overflow
14634 13 Jun 2020 @ 1645 --- William arrived to overflow with light circular boil.
14605 11 Jun 2020 @ 1957 --- William first overflow
14546 05 Jun 2020 @ 1250 --- RLJones no eruption yet as of 1250
14530 03 Jun 2020 @ 2230 --- William Still no overflow at 22:30
14236 25 May 2020 @ 1523 --- mhvogel Hey geyser enthusiasts. I went to Firehole Lake Drive this morning to retrieve the data logger eruptions times of Great Fountain. It stopped logging on April 28 so there is nearly a month of eruptions that is lost. I reconfigured the logger so as of 0940 it began logging again. I'll input the eruption times as soon as I can as it takes a long time to enter over a month's worth of data. This summer Old Faithful Park Rangers will not be predicting Great Fountain geyser. We will not be there every morning like we used to be and that's rather unfortunate. This is due to low staffing levels and operational needs. It is way beyond my control.
13952 16 Oct 2019 @ 1546 --- Maureen Firehole Lake Drive has been closed since the whole park shut down last week and has NOT reopened.
13951 16 Oct 2019 @ 1438 --- mhvogel After arduously reviewing the GF electronic data, it appears GF is going into a "wild phase". On 10/9 it was doing these small eruptions every from 0443-1622 every 20-30 minutes. On 10/10 more small eruptions every 20-30 minutes. On 10/11 and 10/12 not much of anything. On 10/13 and 10/14 GF began to have small eruptions again about every 30-60 minutes. I hope this helps.
13991 14 Oct 2019 @ 1234 --- mhvogel After reviewing the great fountain graph, the wild phase period started on 10/9 and ended on the morning/afternoon of 10/14.
13990 14 Oct 2019 @ 1224 --- mhvogel The geology department emailed me the Great Fountain electronic graph for 10/14-10/18.
13901 07 Oct 2019 @ 1042 --- underarockphoto In full overflow
13894 06 Oct 2019 @ 1120 --- cb overflow just starting on the 2nd tier.
13873 04 Oct 2019 @ 1450 --- Maureen Overflow start.
13861 04 Oct 2019 @ 0730 --- underarockphoto Five inches below overflow.
13834 30 Sep 2019 @ 1247 --- Maureen The next eruption will be after 1500.
13802 25 Sep 2019 @ 1219 --- Maureen Overflow start.
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.
EntrySourceLinkComment
20 Sep 2020 @ 0940 JohnO https://youtu.be/sZzC-l1NQ74 Great Fountain Geyser eruption, September 20, 2020. Video composed of three clips from the first eruptive set. Eruption commenced 9:38 AM.
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.