Last Known Eruption
23h 50m ago

Latest Eruptions

Eruption DurationInterval
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
10 Oct 2020 @ 1844 E10h 11m
10 Oct 2020 @ 083317h 29m
09 Oct 2020 @ 150411h 50m
09 Oct 2020 @ 0314 E10h 57m
08 Oct 2020 @ 161710h 11m
08 Oct 2020 @ 0606 E12h 23m
07 Oct 2020 @ 1743 ie11h 2m
07 Oct 2020 @ 0641 E9h 37m
06 Oct 2020 @ 2104 E11h 35m
06 Oct 2020 @ 092911h 20m
05 Oct 2020 @ 2209 E10h 51m
05 Oct 2020 @ 111812h 53m
04 Oct 2020 @ 2225 E9h 39m
04 Oct 2020 @ 1246 E9h 39m
04 Oct 2020 @ 0307 E12h 24m
03 Oct 2020 @ 1443 E11h 55m
03 Oct 2020 @ 0248 E10h 31m
02 Oct 2020 @ 161712h 3m
02 Oct 2020 @ 0414 E12h 56m
01 Oct 2020 @ 15189h 19m
01 Oct 2020 @ 0559 E11h 24m
30 Sep 2020 @ 183512h 8m
30 Sep 2020 @ 0627 E11h 30m
29 Sep 2020 @ 185710h 36m
29 Sep 2020 @ 0821 E10h 58m
28 Sep 2020 @ 2123 E1d 7h 48m
27 Sep 2020 @ 13351d 4h 22m
26 Sep 2020 @ 091310h 26m
25 Sep 2020 @ 2247 E10h 38m
25 Sep 2020 @ 120930m 10h 58m
25 Sep 2020 @ 0111 E14h 14m
24 Sep 2020 @ 1057 E9h 43m
24 Sep 2020 @ 0114 E10h 17m
23 Sep 2020 @ 1457 E10h 1m
23 Sep 2020 @ 0456 E12h 13m
22 Sep 2020 @ 1643 E9h 42m
22 Sep 2020 @ 0701 E11h 11m
21 Sep 2020 @ 1950 E10h 23m
21 Sep 2020 @ 092711h 41m
20 Sep 2020 @ 214612h 6m
20 Sep 2020 @ 0940 E10h 52m
19 Sep 2020 @ 2248 E12h 58m
19 Sep 2020 @ 09501h 15m 11h 41m
18 Sep 2020 @ 2209 E10h 51m
18 Sep 2020 @ 1118 E11h 29m
17 Sep 2020 @ 2349 E12h 29m
17 Sep 2020 @ 1120 E13h 7m
16 Sep 2020 @ 221311h 45m
16 Sep 2020 @ 1028 E11h 41m
15 Sep 2020 @ 2247 E11h 51m
15 Sep 2020 @ 1056 E10h 48m
15 Sep 2020 @ 0008 E12h 22m
14 Sep 2020 @ 114610h 27m
14 Sep 2020 @ 0119 E12h 39m
13 Sep 2020 @ 124012h 36m
13 Sep 2020 @ 000411h 50m
12 Sep 2020 @ 121414h 34m
11 Sep 2020 @ 2140 E12h 0m
11 Sep 2020 @ 0940 ie9h 35m
11 Sep 2020 @ 00058h 59m
10 Sep 2020 @ 150610h 22m
10 Sep 2020 @ 0444 E13h 4m
09 Sep 2020 @ 1540 ie11h 18m
09 Sep 2020 @ 0422 E11h 11m
08 Sep 2020 @ 1711 E9h 18m
08 Sep 2020 @ 0753 E11h 4m
07 Sep 2020 @ 2049 E12h 18m
07 Sep 2020 @ 0831 E10h 46m
06 Sep 2020 @ 2145 E11h 56m
06 Sep 2020 @ 0949 E16h 7m
05 Sep 2020 @ 1742>11h 47m
05 Sep 2020 @ 0555 ie11h 5m
04 Sep 2020 @ 185010h 54m
04 Sep 2020 @ 075611h 20m
03 Sep 2020 @ 203612h 22m
03 Sep 2020 @ 081410h 37m
02 Sep 2020 @ 213711h 32m
02 Sep 2020 @ 1005 E11h 57m
01 Sep 2020 @ 2208 E14h 7m
01 Sep 2020 @ 0801 E10h 58m
31 Aug 2020 @ 2103 maj5013h 8m
31 Aug 2020 @ 0755 ie10h 48m

Interval Statistics

Interval Count100
Min8h 59m
Max1d 7h 48m
Mean12h 3m
Median11h 31m

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.