Last Known Eruption
65d 20h 30m ago

Latest Eruptions

Eruption DurationInterval
08 Feb 2024 @ 1732 ie33d 9h 3m
06 Jan 2024 @ 0829 ie68d 19h 44m
29 Oct 2023 @ 1345 ns40m 20h 49m
28 Oct 2023 @ 1656 ie1d 5h 32m
27 Oct 2023 @ 1124 ie2d 18h 38m
24 Oct 2023 @ 1646 ie4d 4h 18m
20 Oct 2023 @ 1228 ie1d 23h 26m
18 Oct 2023 @ 13021d 49m
17 Oct 2023 @ 12131d 1h 28m
16 Oct 2023 @ 1045 ie~601d 33m
15 Oct 2023 @ 1012 ?6d 16h 46m
08 Oct 2023 @ 17261d 18m
07 Oct 2023 @ 170822h 36m
06 Oct 2023 @ 18322d 8h 32m
04 Oct 2023 @ 1000 ? ie1d 17m
03 Oct 2023 @ 0943 ? ie2d 1h 19m
01 Oct 2023 @ 0824 ? ie1d 22h 24m
29 Sep 2023 @ 100022h 7m
28 Sep 2023 @ 1153~1h 15m 21h 25m
27 Sep 2023 @ 142823h 38m
26 Sep 2023 @ 14501d 1h 20m
25 Sep 2023 @ 13301d 35m
24 Sep 2023 @ 125522h 46m
23 Sep 2023 @ 14091d 57m
22 Sep 2023 @ 1312 ? ie2d 5h 44m
20 Sep 2023 @ 0728 ie12h 35m
19 Sep 2023 @ 185310h 23m
19 Sep 2023 @ 0830 A17h 20m
18 Sep 2023 @ 151022h 16m
17 Sep 2023 @ 1654:0021h 9m
16 Sep 2023 @ 19451d 1h 17m
15 Sep 2023 @ 18283d 8h 9m
12 Sep 2023 @ 101922h 19m
11 Sep 2023 @ 1200 Adone by 132020h 40m
10 Sep 2023 @ 152021h 49m
09 Sep 2023 @ 173122h 30m
08 Sep 2023 @ 19011d 8h 26m
07 Sep 2023 @ 103535m 23h 0m
06 Sep 2023 @ 11352d 5h 16m
04 Sep 2023 @ 0619 ie23h 22m
03 Sep 2023 @ 0657 ie12h 28m
02 Sep 2023 @ 182910h 53m
02 Sep 2023 @ 073622h 49m
01 Sep 2023 @ 08471h 5m 13h 34m
31 Aug 2023 @ 191310h 43m
31 Aug 2023 @ 083023h 19m
30 Aug 2023 @ 0911 ie22h 42m
29 Aug 2023 @ 1029 ie1d 19m
28 Aug 2023 @ 1010 ie1d 2h 5m
27 Aug 2023 @ 0805 ie1d 22h 13m
25 Aug 2023 @ 0952 ie23h 4m
24 Aug 2023 @ 10482d 2h 49m
22 Aug 2023 @ 0759 ns1d 12h 43m
20 Aug 2023 @ 191612h 16m
20 Aug 2023 @ 0700 ie1d 21h 50m
18 Aug 2023 @ 0910 ie12h 8m
17 Aug 2023 @ 210210h 17m
17 Aug 2023 @ 1045 A22h 44m
16 Aug 2023 @ 12013d 18h 40m
12 Aug 2023 @ 17211d 23m
11 Aug 2023 @ 16581d 2h 24m
10 Aug 2023 @ 14341d 20h 4m
08 Aug 2023 @ 18301d 21h 44m
06 Aug 2023 @ 20461d 10h 29m
05 Aug 2023 @ 1017 ie1d 21h 34m
03 Aug 2023 @ 1243 ie1d 23h 34m
01 Aug 2023 @ 130922h 52m
31 Jul 2023 @ 1417 E11h 14m
31 Jul 2023 @ 0303 E11h 20m
30 Jul 2023 @ 15432d 1h 39m
28 Jul 2023 @ 14043d 7h 7m
25 Jul 2023 @ 0657 ie11h 10m
24 Jul 2023 @ 19471d 12h 41m
23 Jul 2023 @ 0706 ie12h 48m
22 Jul 2023 @ 181823h 24m
21 Jul 2023 @ 1854 ie1d 4h 29m
20 Jul 2023 @ 142522h 0m
19 Jul 2023 @ 162523h 8m
18 Jul 2023 @ 1717 ie1d 9h 26m
17 Jul 2023 @ 0751 ie21h 53m
16 Jul 2023 @ 095814h 10m
15 Jul 2023 @ 1948 ie12h 32m
15 Jul 2023 @ 0716 ie10h 21m
14 Jul 2023 @ 2055 ie1d 1h 43m
13 Jul 2023 @ 191212h 14m
13 Jul 2023 @ 0658 ie11h 8m
12 Jul 2023 @ 195010h 49m
12 Jul 2023 @ 0901 ie11h 51m
11 Jul 2023 @ 211011h 59m
11 Jul 2023 @ 0911 ie14h 25m
10 Jul 2023 @ 1846 ie11h 4m
10 Jul 2023 @ 0742 ie11h 25m
09 Jul 2023 @ 2017 ie11h 10m
09 Jul 2023 @ 0907 ie21h 48m
08 Jul 2023 @ 111923h 40m
07 Jul 2023 @ 11391d 1h 21m
06 Jul 2023 @ 101822h 51m
05 Jul 2023 @ 11273d 26m
02 Jul 2023 @ 11015d 15h 21m
26 Jun 2023 @ 1940 ie23h 6m

Interval Statistics

Interval Count100
Min10h 17m
Max68d 19h 44m
Mean2d 6h 41m
Median23h 20m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
28863 18 Oct 2023 @ 1137 18 Oct 2023 @ 1154 DanS Pool dropped about a foot by 1137. Pool back up and boiling resumed by 1154.
28862 18 Oct 2023 @ 1013 --- DanS Pool dropped a bit. Unattended 1016-1112.
28861 18 Oct 2023 @ 1004 --- DanS In early overflow
28838 17 Oct 2023 @ 1107 17 Oct 2023 @ 1127 DanS Pool dropped about a foot again, boils stopped. Pool back up and boils resumed 1127.
28837 17 Oct 2023 @ 1029 17 Oct 2023 @ 1046 DanS Pool dropped about one foot by 1029 and edge boils stopped. Pool coming back up at 1044 with renewed edge boils at 1046.
28835 17 Oct 2023 @ 0927 --- DanS In early overflow
28549 29 Sep 2023 @ 1610 --- User34 Pool hasn't budged in two hours
28529 28 Sep 2023 @ 1135 --- DanS Already in overflow
28515 27 Sep 2023 @ 1312 --- CraigC started overflow
28442 24 Sep 2023 @ 1144 --- CraigC started overflow
28353 19 Sep 2023 @ 1744 --- CraigC started overflow
28334 18 Sep 2023 @ 1600 18 Sep 2023 @ 1710 DanS Fantastic late bursts on GF: tall, strong 5th, 6th, 7th. Decent 8th, small 9th, 10th barely ejected water beyond crater. Sometimes pays to stay…
28114 08 Sep 2023 @ 1100 --- CraigC I believe GF is post-eruptive. At 1030 water level was about a foot below the rim. there was light boiling around the inside of the rim. The boiling stopped at 1100 and water dropped a few inches.
28104 07 Sep 2023 @ 1900 07 Sep 2023 @ 2055 Tara I was at Fountain during this time and never saw a steam cloud from Great Fountain. At 2055 it became too dark to see.
27888 31 Aug 2023 @ 1728 --- Kyle not in overflow
27879 31 Aug 2023 @ 0750 --- SteveO In overflow.
27751 23 Aug 2023 @ 1600 23 Aug 2023 @ 1845 TLH Pool remained 12"-18" below full.
27683 19 Aug 2023 @ 1050 --- Art Appeared post eruptive. Vigorous boiling on left side as seen from benches. Not in overflow.
27640 16 Aug 2023 @ 1039 --- Suzanne Start of overflow.
27639 16 Aug 2023 @ 0957 --- Suzanne Started overflowing briefly but then dropped after 3 to 4 minutes.
27335 30 Jul 2023 @ 1421 --- Darcie Started overflow
27036 12 Jul 2023 @ 1905 --- Tara Overflow in progress, runoff starting trickling off top platform.
26653 24 Jun 2023 @ 2015 --- Tara In overflow well off terraces, ring boiling
26652 24 Jun 2023 @ 1930 --- Tara Calm pool, water level ~8-10 inches below rim, rising
26604 22 Jun 2023 @ 1905 --- Tara in overflow, just starting to trickle off terraces
26196 09 Jun 2023 @ 1715 --- Art Appears to be several hours post eruptive. Runoff channel still very wet and lots of puddling despite full sun and no rain. Water about 2 feet below overflow with a small boil in back of pool by area of first overflow channel.
26027 04 Jun 2023 @ 1128 --- gobysmith start of overflow
26026 03 Jun 2023 @ 1039 --- gobysmith hiked in along the road. in overflow, light boiling
24473 21 Oct 2022 @ 1718 --- DanS In overflow
24458 21 Oct 2022 @ 0903 --- DanS Post eruptive
24459 21 Oct 2022 @ 0903 --- DanS Post eruptive
24389 15 Oct 2022 @ 1220 --- Smell of eggs Sat around G.F. From 12:20 to 15:50 the pool looked to be in recovery from the previous eruption, the pool had risen anywhere 6”-1’4’ from the time I sat, I assume that morning eruption was anywhere from 8:30 - 10:00.
24371 14 Oct 2022 @ 1440 --- Tara platform wet, channels damp, water visible but down and boiling a little at the edge; erupted maybe 2-3 hours earlier.
24357 13 Oct 2022 @ 1540 --- Tara runoff channels and platform damp, guessing eruption in last 2-3 hours. water level visible and rising with a bit of boiling around the edges. probably refilling?
24348 12 Oct 2022 @ 1635 --- Tara Channels dry, no water visible in crater
24344 09 Oct 2022 @ 1549 --- User34 Still i.e.
24285 06 Oct 2022 @ 1011 --- DanS Not in overflow yet
24220 04 Oct 2022 @ 1140 --- DanS Overflow in progress
24218 04 Oct 2022 @ 1005 --- DanS Not in overflow yet
24202 03 Oct 2022 @ 1600 --- Art Pool down about a foot or more. Probably erupted around 1100-1200?
24173 30 Sep 2022 @ 1439 --- RMichaels First overflow.
24113 25 Sep 2022 @ 1740 --- SteveO 1740 start of overflow.
24054 24 Sep 2022 @ 1510 --- Art About 6” below overflow already. Maybe an eruption before sunset tonight?
24024 23 Sep 2022 @ 1903 --- Art Still not in overflow yet
23978 21 Sep 2022 @ 0730 --- RLJones first overflow
23940 20 Sep 2022 @ 0800 --- Graham In overflow lightly trickling off the terraces. 0815 much noisier overflow. 0826 audible boil.
23845 15 Sep 2022 @ 1447 --- ThomasR Start of overflow. Initial light overflow at 1405 but not sustained.
23677 09 Sep 2022 @ 1215 --- Ben VL Pool pretty darn low. Guessing it had a long series last night. It is possible it could have been a crash. But if it is, it's a very large crash.
23613 06 Sep 2022 @ 2007 --- Art Start of overflow
23405 25 Aug 2022 @ 1347 --- cb In overflow at 1347 ie and tricking over all the Terrances & down toward White dome. nice rim boil.
23151 12 Aug 2022 @ 1334 --- minissa Largish steam cloud in the right place, but seen from the road
21802 06 Jun 2022 @ 1605 --- LynnS Start of overflow
21227 10 May 2022 @ 1346 --- ypcaribou Tall steam seen from main road at entrance to Firehole Lake Drive. May have been ie.
20156 28 Oct 2021 @ 0915 28 Oct 2021 @ 0925 DanS Quiet. Looks mid-cycle.
20154 27 Oct 2021 @ 1801 27 Oct 2021 @ 1835 DanS GF calm and pretty at sunset. No indication of being in Wild Phase.
20128 25 Oct 2021 @ 1829 --- steve Great Fountain is in overflow, the pool is not boiling and the area of steaming water outside of the main vent is relatively small.
20063 19 Oct 2021 @ 1528 --- mwolf begin overflow
20007 16 Oct 2021 @ 1750 --- annelies8 In overflow, not going to be super accurate with this but it's probably been going a while (at least 30?) already based on how far out the water has extended
19929 06 Oct 2021 @ 1505 --- am Boiling and in overflow upon arrival
19837 01 Oct 2021 @ 2010 --- BillJ No overflow yet, before it got too dark to see.
19745 26 Sep 2021 @ 1150 --- User34 Post-eruptive
19672 21 Sep 2021 @ 0706 --- Art In overflow already when we arrived at 0730, possibly starting at 0706 per others.
19659 19 Sep 2021 @ 1835 --- Graham Not in overflow yet but close.
19514 12 Sep 2021 @ 1432 --- steve First overflow
19480 11 Sep 2021 @ 1332 --- steve First overflow.
19358 07 Sep 2021 @ 1133 --- steve First overflow that held. There was an earlier overflow with a crash.
19247 02 Sep 2021 @ 1210 --- Barbara Lasseter Start of overflow
19126 28 Aug 2021 @ 1226 --- JeffL in overflow
19087 26 Aug 2021 @ 1247 --- Micah Kipple In overflow
19056 25 Aug 2021 @ 1221 --- minissa Of at 1221
19031 23 Aug 2021 @ 2107 --- steve It’s hard to tell by headlights, but this may be the time of first overflow.
19012 23 Aug 2021 @ 0946 --- steve First overflow 0946, prediction of about 1106
18981 21 Aug 2021 @ 1325 --- minissa Arrived late for initial burst but later bursts {I'm thinking 3rd and esp 4th} had excellent height, volume and energy with one very nice blue bubble
18971 21 Aug 2021 @ 0300 --- LynnS Eruption had completely finished.
18960 18 Aug 2021 @ 1806 18 Aug 2021 @ 1818 minissa Pool not quite to overflow and still rising when we left
18890 10 Aug 2021 @ 1627 --- User34 Overflow reachieved
18888 10 Aug 2021 @ 1600 --- aferrara After about 30 minutes in weak overflow, pool dropped ~1.5'. Out of overflow.
18889 10 Aug 2021 @ 1529 --- User34 First overflow, started crashing at 1600-1605
18829 04 Aug 2021 @ 1035 --- LynnS Start of overflow
18815 03 Aug 2021 @ 0948 --- LynnS Start of overflow
18806 02 Aug 2021 @ 1900 02 Aug 2021 @ 1930 aferrara Water still 1' below overflow, rising very slightly over range of observation.
18773 01 Aug 2021 @ 0930 --- User34 First overflow
18759 31 Jul 2021 @ 1006 --- LynnS Start of overflow
18744 30 Jul 2021 @ 1302 --- LynnS Into overflow
18729 29 Jul 2021 @ 1252 --- LynnS Start of overflow
18707 28 Jul 2021 @ 1449 --- LynnS Overflow start
18706 28 Jul 2021 @ 1408 --- LynnS Overflowed briefly, then crashed
18688 27 Jul 2021 @ 1434 --- LynnS Start of overflow
18659 25 Jul 2021 @ 1424 --- LynnS Start of overflow
18655 25 Jul 2021 @ 0743 --- LynnS Still in post-eruptive audible boiling stage. Water level has dropped such that boiling is not visible while standing on the boardwalk.
18635 24 Jul 2021 @ 1324 --- LynnS Start of oberflow
18612 23 Jul 2021 @ 1403 --- LynnS Start of overflow
18611 23 Jul 2021 @ 1317 --- LynnS Pool rose close to overflow 1317 then crashed out of sight.
18610 23 Jul 2021 @ 1241 --- LynnS Pool rose to just slightly below overflow. Pool dropped several inches but did not crash 1254.
18591 22 Jul 2021 @ 1530 --- LynnS Not yet in overflow
18590 22 Jul 2021 @ 0545 --- Barbara Lasseter In overflow. Trickling over outer terrace.
18562 21 Jul 2021 @ 0605 --- Barbara Lasseter Not in overflow
18546 20 Jul 2021 @ 0701 --- steve In overflow when I pulled up but only a small amount of the first terrace is steaming. I left a minute later to check on Pink Cone so no guarantee it stayed in overflow.
18548 20 Jul 2021 @ 0615 --- Barbara Lasseter Not in overflow
18545 19 Jul 2021 @ 1814 --- steve First overflow
EntrySourceLinkComment
20 Jul 2020 @ 1948 Delta4Heavy85 https://adobe.ly/3qagZW6 Picture of large spike during B2
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.