Last Known Eruption
6h 32m ago
Predicted Next Eruption
Today at 1745 ± 120 minutes

Latest Eruptions

Eruption DurationInterval
13 May 2025 @ 0635 ie13h 54m
12 May 2025 @ 164110h 10m
12 May 2025 @ 063110h 45m
11 May 2025 @ 194611h 8m
11 May 2025 @ 083811h 45m
10 May 2025 @ 20539h 43m
10 May 2025 @ 111011h 22m
09 May 2025 @ 234813h 51m
09 May 2025 @ 095711h 23m
08 May 2025 @ 22349h 45m
08 May 2025 @ 12491d 1h 42m
07 May 2025 @ 110711h 6m
07 May 2025 @ 0001 ie1d 18h 31m
05 May 2025 @ 0530 ie1d 14h 41m
03 May 2025 @ 144923h 20m
02 May 2025 @ 15294d 22h 53m
27 Apr 2025 @ 1636 ie21h 43m
26 Apr 2025 @ 18531d 2h 56m
25 Apr 2025 @ 1557 ns20h 39m
24 Apr 2025 @ 191811h 19m
24 Apr 2025 @ 0759 ie13h 11m
23 Apr 2025 @ 1848 ie23h 58m
22 Apr 2025 @ 18502d 8h 34m
20 Apr 2025 @ 101622h 27m
19 Apr 2025 @ 1149 ie50d 2h 3m
28 Feb 2025 @ 0846 ns2d 12h 16m
25 Feb 2025 @ 2030 ie6d 3h 25m
19 Feb 2025 @ 1705 ie10d 5h 1m
09 Feb 2025 @ 1204 ie13d 1h 8m
27 Jan 2025 @ 1056 ie7d 19h 14m
19 Jan 2025 @ 1542 ie9d 1h 18m
10 Jan 2025 @ 1424 ie7d 23h 57m
02 Jan 2025 @ 1427 ie6d 22h 57m
26 Dec 2024 @ 1530 ie2d 6h 30m
24 Dec 2024 @ 0900 ie19d 20h 45m
04 Dec 2024 @ 1215 ie11d 9h 54m
23 Nov 2024 @ 022111h 51m
22 Nov 2024 @ 14301h 42m 27d 2h 1m
26 Oct 2024 @ 13291d 6m
25 Oct 2024 @ 13231d 23h 17m
23 Oct 2024 @ 1406 ie22h 34m
22 Oct 2024 @ 153221h 46m
21 Oct 2024 @ 1746 ie1d 1h 51m
20 Oct 2024 @ 155521h 10m
19 Oct 2024 @ 1845>10m 23h 42m
18 Oct 2024 @ 19031d 37m
17 Oct 2024 @ 1826 ie10h 31m
17 Oct 2024 @ 0755 ie11h 9m
16 Oct 2024 @ 20469h 52m
16 Oct 2024 @ 105411h 46m
15 Oct 2024 @ 2308 A11h 30m
15 Oct 2024 @ 113822h 39m
14 Oct 2024 @ 12591d 6h 41m
13 Oct 2024 @ 061811h 12m
12 Oct 2024 @ 190610h 33m
12 Oct 2024 @ 083314h 5m
11 Oct 2024 @ 182810h 12m
11 Oct 2024 @ 081612h 33m
10 Oct 2024 @ 194312h 16m
10 Oct 2024 @ 072711h 3m
09 Oct 2024 @ 202411h 22m
09 Oct 2024 @ 090212h 6m
08 Oct 2024 @ 205610h 44m
08 Oct 2024 @ 10129h 16m
08 Oct 2024 @ 005611h 6m
07 Oct 2024 @ 135021h 27m
06 Oct 2024 @ 1623 ie1d 3h 17m
05 Oct 2024 @ 13061d 3h 25m
04 Oct 2024 @ 094113h 20m
03 Oct 2024 @ 20211h 3m 10h 27m
03 Oct 2024 @ 095412h 34m
02 Oct 2024 @ 2120 ie10h 57m
02 Oct 2024 @ 10239h 48m
02 Oct 2024 @ 0035 ie13h 3m
01 Oct 2024 @ 113222h 39m
30 Sep 2024 @ 125322h 27m
29 Sep 2024 @ 14261d 58m
28 Sep 2024 @ 132822h 52m
27 Sep 2024 @ 143622h 58m
26 Sep 2024 @ 153823h 38m
25 Sep 2024 @ 1600 A23h 38m
24 Sep 2024 @ 16221d 4h 49m
23 Sep 2024 @ 11331d 2h 22m
22 Sep 2024 @ 091110h 58m
21 Sep 2024 @ 221312h 23m
21 Sep 2024 @ 095011h 45m
20 Sep 2024 @ 220514h 0m
20 Sep 2024 @ 080511h 20m
19 Sep 2024 @ 204511h 1m
19 Sep 2024 @ 09441d 37m
18 Sep 2024 @ 09079h 37m
17 Sep 2024 @ 2330 A11h 10m
17 Sep 2024 @ 122022h 6m
16 Sep 2024 @ 141412h 18m
16 Sep 2024 @ 015612h 15m
15 Sep 2024 @ 1341 ie30m 11h 34m
15 Sep 2024 @ 020712h 52m
14 Sep 2024 @ 131522h 28m
13 Sep 2024 @ 14471h 3m 1d 45m
12 Sep 2024 @ 1402 ie23h 47m

Interval Statistics

Interval Count100
Min9h 16m
Max50d 2h 3m
Mean2d 10h 29m
Median20h 54m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
39029 13 May 2025 @ 0856 --- K.Cooper still having bursts to 50ft
39011 12 May 2025 @ 1844 --- Graham Good 5th, strong 6th and 7th with blue bubbles, ok 8th and 9th ended 1844. Attempted a 10th, but failed.
39016 12 May 2025 @ 1535 --- steve Drove up and it was in overflow likely started in the last half hour. The first terrace areas next to the main vent are steaming.
39002 12 May 2025 @ 0607 --- steve Arrived to GF in overflow, I think for some time. All the first terrace is steaming and there is runoff down to the flats between GF and White Dome
39001 11 May 2025 @ 1833 --- steve First overflow. GF had a false overflow at 1755 but after a few minutes it crashed.
38967 10 May 2025 @ 1945 --- Ben VL Ovfl in progress, this is a relay of a relay.
38984 10 May 2025 @ 1944 --- steve Arrived to find GF in overflow, it appears early in overflow.
38985 10 May 2025 @ 1944 --- steve Arrived to find GF in overflow, it appears early in overflow.
38920 10 May 2025 @ 0936 --- Ben VL Start of overflow per sat text from Korben.
38906 09 May 2025 @ 0839 --- steve In overflow when I arrived. Subjectively it appears relatively early in the overflow.
38897 08 May 2025 @ 2200 --- Tara in overflow and boiling
38885 08 May 2025 @ 1249 --- steve 1 meter boil 1248, second series 1305, third 1317, fourth tried at 1329, but was about 10-20 feet high for 1-2 minutes fifth tried at 1336 but fizzled.
38880 08 May 2025 @ 1125 --- Art Start of overflow per Sat text from Dan A.
38865 07 May 2025 @ 1009 --- Art In early stage of overflow (Per Sat text from Dan A)
38578 22 Apr 2025 @ 1833 --- DanS Well into overflow.
38567 21 Apr 2025 @ 1911 --- DanS Not yet in overflow
38549 20 Apr 2025 @ 0924 --- DanS Already In overflow
37592 16 Oct 2024 @ 0958 --- Bhoffer Recently began overflow
37517 10 Oct 2024 @ 1821 --- SantaFe108 Start of overflow.
37518 10 Oct 2024 @ 1820 --- steve First overflow within a minute or two of 1820.
37516 10 Oct 2024 @ 1653 --- mrsteed pool not yet full - no overflow
37466 09 Oct 2024 @ 1907 --- steve First overflow
37446 08 Oct 2024 @ 1635 --- mrsteed looks fairly empty
37421 06 Oct 2024 @ 1400 --- Tara trickle of overflow just starting, could not stay
37341 03 Oct 2024 @ 0820 --- Graham Approx start of overflow
37340 03 Oct 2024 @ 0745 --- Ben VL Close to overflow
37330 02 Oct 2024 @ 0906 --- Graham Start of overflow. Prediction 1016 to 1046.
37313 01 Oct 2024 @ 1009 --- TSBryan start of overflow
37314 01 Oct 2024 @ 1009 --- TSBryan start of overflow
37315 01 Oct 2024 @ 1009 --- TSBryan start of overflow
37316 01 Oct 2024 @ 1009 --- TSBryan start of overflow
37280 30 Sep 2024 @ 1125 --- Ben VL Start of overflow.
37238 29 Sep 2024 @ 0827 --- User34 Steaming hole
37192 27 Sep 2024 @ 1318 --- Art Great Fountain start of overflow per satellite text
37168 26 Sep 2024 @ 1427 --- Art In overflow per sat text
37162 26 Sep 2024 @ 0750 --- RLJones Pool is approximately 8 inches below overflow
37293 23 Sep 2024 @ 2321 --- Siegmund Not overflowing yet (as expected after very long duration morning eruption)
37290 22 Sep 2024 @ 2125 --- Siegmund Still not in overflow yet.
37097 20 Sep 2024 @ 2036 --- Dan A As of 2003 not yet in overflow, but pool is very high
37078 19 Sep 2024 @ 2012 --- Art Via Sat Text: GF about 50 minutes into overflow
37056 19 Sep 2024 @ 0817 --- Dan A Reached overflow at this time
36977 14 Sep 2024 @ 1416 --- Graham 4th stronger than 3rd. End 1403 5th weaker. End 1416 No 6th
36973 14 Sep 2024 @ 1155 --- CPartner first overflow 1155
36954 13 Sep 2024 @ 0851 --- Kyle quiet, lightly steaming. well below overflow
36856 08 Sep 2024 @ 1526 --- Tara radio call that overflow had started 10-15m before 1526
36867 08 Sep 2024 @ 1526 --- Kyle in early overflow probably 5-10 minutes in
36785 06 Sep 2024 @ 0713 --- Ben VL Not in overflow yet but pool is high.
36787 05 Sep 2024 @ 1910 --- steve First overflow
36782 05 Sep 2024 @ 0703 --- LynnS Start of overflow
36767 05 Sep 2024 @ 0650 --- Ben VL Was in overflow but dropped around this time
36752 04 Sep 2024 @ 1630 --- Graham NOT in overflow.
36750 04 Sep 2024 @ 0530 --- LynnS Already in overflow
36740 03 Sep 2024 @ 1920 --- steve First overflow.
36716 02 Sep 2024 @ 1750 --- Kyle overflow began
36700 02 Sep 2024 @ 0632 --- LynnS In overflow
36683 01 Sep 2024 @ 1840 --- steve First overflow, strong overflow
36689 01 Sep 2024 @ 1839 --- CP Start of overflow
36675 01 Sep 2024 @ 0600 --- LynnS In overflow, audible trickle at 0600 but no sounds of boiling.
36674 01 Sep 2024 @ 0430 --- LynnS Great Fountain was not in overflow at 0430.
36664 31 Aug 2024 @ 0646 --- LynnS Start of overflow
36652 31 Aug 2024 @ 0605 --- CraigC not in overflow yet
36657 30 Aug 2024 @ 1802 --- steve First overflow
36641 30 Aug 2024 @ 0510 --- LynnS In audible overflow
36614 29 Aug 2024 @ 0600 --- LynnS Is in heavy overflow
36594 28 Aug 2024 @ 0600 --- CraigC in audible overflow
36591 27 Aug 2024 @ 1811 --- Kyle in overflow already
36573 27 Aug 2024 @ 0835 --- LynnS Already in heavy overflow, audible boiling in the crater
36548 25 Aug 2024 @ 1304 --- LynnS Start of overflow
36547 25 Aug 2024 @ 0244 --- LynnS Overflow started before this time;started after 0220
36533 24 Aug 2024 @ 1429 --- Dan A As of 35 minutes ago not in overflow yet
36537 24 Aug 2024 @ 1410 --- LynnS Start of overflow
36536 24 Aug 2024 @ 1332 --- LynnS Start of overflow that lasted about 7 minutes.
36519 23 Aug 2024 @ 1256 --- LynnS Start of overtime
36511 22 Aug 2024 @ 1327 --- LynnS Start of overflow
36504 21 Aug 2024 @ 1201 --- LynnS Start of overflow
36490 20 Aug 2024 @ 1404 --- LynnS Start of overfloe
36438 17 Aug 2024 @ 1431 --- LynnS Overflow started
36437 17 Aug 2024 @ 0455 --- LynnS Ns for overflow—not trickling at 0502, trickling at 0510
36426 16 Aug 2024 @ 1411 --- LynnS Start of overflow
36419 15 Aug 2024 @ 1421 --- LynnS Start of overflow
36413 15 Aug 2024 @ 0430 --- LynnS Already in overflow when I arrived at 0430.
36411 14 Aug 2024 @ 1730 --- LynnS Start of overflow
36400 14 Aug 2024 @ 0457 --- LynnS In overflow when I arrived.
36392 13 Aug 2024 @ 1418 --- LynnS Start of overflow
36391 13 Aug 2024 @ 0425 --- LynnS Already in overflow when I arrived at 0425
36386 12 Aug 2024 @ 1653 12 Aug 2024 @ 1657 guttermangaming 2nd part of eruption, more water and large bursts of water many times. taller than last part
36385 12 Aug 2024 @ 1630 --- guttermangaming Lower beginning burst.
36384 12 Aug 2024 @ 1448 --- LynnS Back into overflow
36383 12 Aug 2024 @ 1426 --- LynnS Returned to overflow for about 5 minutes.
36382 12 Aug 2024 @ 1414 --- LynnS Start of overflow lasted 4-5 minutes
36372 11 Aug 2024 @ 1323 --- LynnS Start of overflow
36357 10 Aug 2024 @ 1228 --- LynnS Start of overflow out north channels
36338 09 Aug 2024 @ 1459 --- LynnS Start of overflow
36329 08 Aug 2024 @ 1518 --- LynnS Start of overflow
36302 06 Aug 2024 @ 1119 --- CraigC started overflow
36272 04 Aug 2024 @ 1306 --- mdschwarz Start of overflow
36271 04 Aug 2024 @ 1248 --- mdschwarz Pool down ~1 foot+ below overflow.
36270 04 Aug 2024 @ 1206 --- mdschwarz Not in overflow. Flat pool a few inches below overflow
36228 02 Aug 2024 @ 1700 --- annelies8 Not anywhere overflow, center is empty with some intermittent light splashing so I can only assume it has already erupted considering >13h interval. Not confident enough to make that official call though.
36215 02 Aug 2024 @ 0220 --- Bhoffer In 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.