Last Known Eruption
6h 34m ago
Predicted Next Eruption
Today at 0147 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
20 Sep 2020 @ 1952T1Q6h 10m
20 Sep 2020 @ 134211m ---6h 9m
20 Sep 2020 @ 0733 ie wc---18h 12m
19 Sep 2020 @ 132110m 38s G2Q6h 25m
19 Sep 2020 @ 065610m 13s D2/G1C12h 17m
18 Sep 2020 @ 183912m 5s G1Q6h 6m
18 Sep 2020 @ 123312m 11s G21Q6h 19m
18 Sep 2020 @ 0614 E---5h 58m
18 Sep 2020 @ 0016 E---7h 3m
17 Sep 2020 @ 171311m 9s G2Q5h 42m
17 Sep 2020 @ 113111m 7s G1Q5h 55m
17 Sep 2020 @ 0536 ie-1Q6h 4m
16 Sep 2020 @ 2332 E---5h 43m
16 Sep 2020 @ 17499m 26s G1C5h 51m
16 Sep 2020 @ 1158 E---5h 56m
16 Sep 2020 @ 0602 E---6h 33m
15 Sep 2020 @ 2329 E---6h 12m
15 Sep 2020 @ 1717 ie wc-2-5h 44m
15 Sep 2020 @ 1133 wc~11m 51s -1-6h 58m
15 Sep 2020 @ 0435 E---6h 8m
14 Sep 2020 @ 2227 E---6h 1m
14 Sep 2020 @ 1626~9m 40s -1Q5h 34m
14 Sep 2020 @ 10529m 5s G1C6h 24m
14 Sep 2020 @ 0428 E---6h 26m
13 Sep 2020 @ 2202 E---6h 8m
13 Sep 2020 @ 1554 wc~11m 21s -1-5h 53m
13 Sep 2020 @ 100112m G1Q6h 0m
13 Sep 2020 @ 0401 E---6h 57m
12 Sep 2020 @ 210411m G1C6h 28m
12 Sep 2020 @ 14369m 35s T1C6h 1m
12 Sep 2020 @ 083510m 12s G1C7h 56m
12 Sep 2020 @ 0039 E---7h 19m
11 Sep 2020 @ 1720D0/G1Q6h 28m
11 Sep 2020 @ 10529m T1C5h 54m
11 Sep 2020 @ 0458 E---5h 55m
10 Sep 2020 @ 2303 E---6h 12m
10 Sep 2020 @ 1651 ie---6h 0m
10 Sep 2020 @ 105111m 38s G2Q7h 2m
10 Sep 2020 @ 0349 wc-2-6h 51m
09 Sep 2020 @ 205810m 37s G2Q6h 14m
09 Sep 2020 @ 1444 wc---6h 7m
09 Sep 2020 @ 0837 ns wc---6h 10m
09 Sep 2020 @ 0227 wc---5h 50m
08 Sep 2020 @ 2037 wc---6h 5m
08 Sep 2020 @ 1432 ie wc>7m 56s -1-5h 39m
08 Sep 2020 @ 0853G1C6h 8m
08 Sep 2020 @ 0245 E---7h 56m
07 Sep 2020 @ 1849 E---5h 30m
07 Sep 2020 @ 1319 ie wc-1-5h 53m
07 Sep 2020 @ 0726 E---7h 38m
06 Sep 2020 @ 2348 E---6h 7m
06 Sep 2020 @ 1740:4611m 13s D2/G1Q6h 20m 4s
06 Sep 2020 @ 1120:4210m 19s G1Q8h 6m 16s
06 Sep 2020 @ 0314:2610m 22s D2/G1C7h 12m 0s
05 Sep 2020 @ 2002:2610m 28s D2/G1Q6h 45m 52s
05 Sep 2020 @ 1316:3410m 41s D2/G2Q6h 13m
05 Sep 2020 @ 070310m 1s T1Q6h 36m
05 Sep 2020 @ 0026:299m 7s D0/G2C6h 2m 32s
04 Sep 2020 @ 1823:578m 24s D0/T1C5h 38m 4s
04 Sep 2020 @ 1245:5310m 59s G2Q5h 50m
04 Sep 2020 @ 065510m 20s T1Q7h 22m
03 Sep 2020 @ 2332:0110m 32s T1Q6h 38m 14s
03 Sep 2020 @ 1653:4710m 25s D2/G2C6h 24m 40s
03 Sep 2020 @ 1029:079m 33s G1C6h 6m 51s
03 Sep 2020 @ 0422:1611m 6s D0/G2Q5h 48m 33s
02 Sep 2020 @ 2233:4310m 49s T1Q6h 22m 34s
02 Sep 2020 @ 1611:0910m 4s D4/G1Q7h 5m 14s
02 Sep 2020 @ 0905:5510m 36s D0/G1Q5h 51m 35s
02 Sep 2020 @ 0314:2011m 47s G1Q6h 9m
01 Sep 2020 @ 2105 wc---6h 16m
01 Sep 2020 @ 1449 ie wc-1-6h 13m
01 Sep 2020 @ 0836G1Q7h 27m
01 Sep 2020 @ 0109 wc-1-7h 12m
31 Aug 2020 @ 1756:3710m 0s D2/G2Q6h 5m 35s
31 Aug 2020 @ 1151:029m 34s G1C5h 50m
31 Aug 2020 @ 0601 ns wc---6h 41m
30 Aug 2020 @ 2320G2Q6h 9m
30 Aug 2020 @ 1710:2911m 22s G2*C6h 8m 31s
30 Aug 2020 @ 1101:5810m 28s D1/D0/G2Q5h 54m
30 Aug 2020 @ 0507 E---6h 18m
29 Aug 2020 @ 2249:0010m 39s G1Q6h 27m 42s
29 Aug 2020 @ 1621:1810m 6s D4/G1C6h 44m 6s
29 Aug 2020 @ 0937:1211m 29s T1Q5h 41m
29 Aug 2020 @ 0356 E---5h 27m
28 Aug 2020 @ 2228:299m 26s G1C5h 51m 7s
28 Aug 2020 @ 1637:2210m 14s G1Q6h 55m 6s
28 Aug 2020 @ 0942:1611m 44s D2/G2*Q6h 6m
28 Aug 2020 @ 0336 E---6h 27m
27 Aug 2020 @ 2108:2610m 49s G2Q5h 27m 10s
27 Aug 2020 @ 1541:1610m 11s G2Q5h 51m 54s
27 Aug 2020 @ 0949:2210m 14s G1C6h 19m
27 Aug 2020 @ 0330 E---6h 1m
26 Aug 2020 @ 2129 E---7h 0m
26 Aug 2020 @ 1429---5h 55m
26 Aug 2020 @ 083411m D0/G1C5h 58m
26 Aug 2020 @ 0236 E---6h 19m
25 Aug 2020 @ 2017 wc-1-6h 43m
25 Aug 2020 @ 1334 wc~10m 41s -1-6h 27m
25 Aug 2020 @ 0707 E---6h 27m
25 Aug 2020 @ 0040 E---5h 53m

Interval Statistics

Interval Count100
Min5h 27m
Max18h 12m
Mean6h 29m
Median6h 9m
Grand-Specific
Start44G/9T (83.02% G)
Max Bursts2
Mean Bursts1.29
Median Bursts1
End35Q/19C (64.81% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
16017 07 Sep 2020 @ 2015 --- William post eruptive, turban and vent off
15415 06 Aug 2020 @ 1715 --- JSJ Pool level visible again.
15413 06 Aug 2020 @ 1442 06 Aug 2020 @ 1452 JSJ Inclinometer readings: highest water during Grand Geyser's first "burst" = ~160 feet; highest water during second "burst" = ~149 feet.
15371 04 Aug 2020 @ 1933 04 Aug 2020 @ 1943 JSJ Inclinometer reading: highest water during 1st "burst" & 2nd "burst": 183 feet.
14753 28 Jun 2020 @ 0910 --- JarnoO (wc) post-eruptive (eruption was probably C) when cam panned back to downbasin after Old Faithful.
14588 10 Jun 2020 @ 2144 --- K.Cooper No Grand yet, Rift stopped
14577 10 Jun 2020 @ 0709 --- K.Cooper pool in overflow, overflow is increasing
14233 23 May 2020 @ 1347 --- Suzanne boop 1 ft high at 13:47:53. did not see previous Turban but suspect we are in a delay.
13954 17 Oct 2019 @ 0945 --- AngelaT Grand has not yet erupted, now ending its window of +/- 45 minutes.
13948 16 Oct 2019 @ 0855 16 Oct 2019 @ 0918 RLJones Post eruptive. Overflow has not yet rerurned
13827 28 Sep 2019 @ 1738 --- susiebb It was a Grand start, abruptly, and the initial burst was so high that, if I had seen it out of context, I would swear it was a second burst. And it was the first I have ever seen that the second burst height did not exceed the initial.
13820 27 Sep 2019 @ 1731 27 Sep 2019 @ 1743 Ajw Started splashing shortly after Vent began. Several tall splashes. Ended at 1743.
13173 11 Aug 2019 @ 2025 --- William post eruptive. Turban and Vent active, Rift also on.
13112 08 Aug 2019 @ 1500 08 Aug 2019 @ 1511 JSJ Inclinometer reading: Highest water about 130 feet.
13097 07 Aug 2019 @ 1235 07 Aug 2019 @ 1246 JSJ Inclinometer reading: Grand's highest water reached about 165 feet.
12388 06 Jul 2019 @ 1841 --- User34 First overflow
11678 09 Jun 2019 @ 1505 --- User34 Pool half full
11581 04 Jun 2019 @ 1724 --- JSJ Inclinometer reading of highest spouts indicate Grand Geyser reached 113 feet high.
11371 27 May 2019 @ 0628 --- TSBryan Grand empty, Vent and Turban i.e.
11335 24 May 2019 @ 0749 24 May 2019 @ 0759 RLJones Grand empty with occasional gurgling and spits of water just barely visible by viewing from standing on bench
11162 04 May 2019 @ 0733 --- RLJones 0733 eruption was 1 burst
11113 28 Apr 2019 @ 0737 --- ddshepard Pool is empty. Looks like it erupted recently but fresh snow is on boardwalk with some ice underneath.
11095 27 Apr 2019 @ 0814 --- Micah Kipple Empty but I can hear it refilling.
10974 09 Apr 2019 @ 2359 --- Graham Grand assumed to erupt before midnight for another 5-Grand day. Joe saw steam from turban and vent on the webcam just after midnight.
10799 27 Dec 2018 @ 1635 --- JarnoO IE from static frame. Based on plume size probably exact, though not sure when that frame was taken.
10736 12 Nov 2018 @ 1439 --- Betty Possible Grand eruption, which was missed on streaming cam. I could see steam out of Grand direction on the daylight capture around this time in the upper left frame.
10702 02 Nov 2018 @ 1106 --- steve Pool now filling quickly
10701 02 Nov 2018 @ 1055 --- steve At 1055 the pool of Grand is still empty
10024 04 Sep 2018 @ 1355 --- SteveO Reached 1st overflow.
9167 13 Jul 2018 @ 0054 --- DaveM Somehow Heinrich's entry for Grand merged with mine. Hopefully Heinrich will post his much more complete entry again.
7834 21 Nov 2017 @ 0733 --- MikeG "Groblong" cloud downbasin at 7:33ie wc.
7712 15 Oct 2017 @ 1827 --- ljmercier Grand had a second burst!
7533 29 Sep 2017 @ 0747 --- JimS Pool empty, Vent and Turban quiet.
6245 09 Sep 2017 @ 1933 --- sfavor waves on grand
5570 02 Sep 2017 @ 0630 --- JimS Empty. Turban and Vent quiet.
5317 25 Aug 2017 @ 0626 --- JimS Pool empt, Vent and Turban ie.
5297 24 Aug 2017 @ 0604 --- JimS Pool empty. Vent and Turban quiet.
5296 23 Aug 2017 @ 2352 --- Jake Vent and Turban ie, Grand empty
4943 18 Aug 2017 @ 0907 --- Brian Overflow started at 9:07
4888 14 Aug 2017 @ 0655 --- JimS Pool below overflow.
4869 10 Aug 2017 @ 0619 --- JimS No water in the pool yet.
4541 26 Jul 2017 @ 0610 --- EmilyW Pool empty, vent turban quiet, no water visible in pool
4529 25 Jul 2017 @ 0523 --- SteveO Grand'a pool is empty and Vent & Turban are going.
4521 24 Jul 2017 @ 0638 --- JimS Small amount of water in the pool. Probably erupted around 0415.
4516 23 Jul 2017 @ 0656 --- JimS First overflow from the pool at this time.
4502 19 Jul 2017 @ 1500 --- SteveO VC in now predicting Grand 6.5 hours + or - 90 minutes
4480 18 Jul 2017 @ 0536 --- SteveO Grand's pool empty, Vent & Turban quiet.
4317 15 Jun 2017 @ 0634 --- B**2 Definitely post-eruption. Turban & Vent sill going.
4280 09 Jun 2017 @ 0701 --- JimS Start of overflow from pool.
4279 09 Jun 2017 @ 0624 --- JimS Plenty of water in the pool. Probably erupted about 0300.
4199 04 Jun 2017 @ 0601 --- JimS Pool empty. Vent and Turban quiet.
4135 27 May 2017 @ 0448 --- Betty probably ie, but very foggy downbasin, and streaming is very choppy, so I don´t dare to call it an eruption
4117 23 May 2017 @ 0521 --- SteveO Grand's pool empty, vent & Turban ie
4110 21 May 2017 @ 0618 --- JimS Pool empty and Vent and Turban ie.
4081 11 May 2017 @ 0710 --- JimS Start of overflow from pool at 0710.
4080 10 May 2017 @ 0632 --- JimS First water came into the pool.
4072 08 May 2017 @ 0635 --- JimS First water came into the pool. Usually occurs 2hrs to 2hrs 10min after the eruption starts.
4071 08 May 2017 @ 0607 --- JimS Pool empty. Vent and Turban quiet.
3955 20 Feb 2017 @ 0831 --- WillBoekel has not reached overflow yet
3954 19 Feb 2017 @ 1030 --- WillBoekel entered overflow in the last hour
3945 10 Feb 2017 @ 0622 --- novakg Possible Grand eruption. Very difficult to tell on webcam.
3935 29 Jan 2017 @ 0721 --- Graham Empty. Turban and Vent ie
3933 28 Jan 2017 @ 0737 --- Graham Empty gurgling and steaming
3932 27 Jan 2017 @ 0740 --- Graham Empty and quiet
3917 23 Jan 2017 @ 0720 --- Graham Post eruptive
3916 23 Jan 2017 @ 0656 --- vw Very large steam plum when I opened window. Too dark and steamy to see clearly. Video review would be helpful.
3901 24 Dec 2016 @ 1747 --- Betty Steam cloud in Grand area, so it possibly went. Hard to tell in the dim light and vanishing visibility.
3877 23 Nov 2016 @ 0820 --- vw Very large steam plume, but I was unable to see water during approx. 10m of heavy steam. Too uncertain to log as an eruption. Review of video may reveal better determination.
3862 06 Nov 2016 @ 0824 --- WillBoekel pool pretty full but not in overflow.
3800 23 Oct 2016 @ 1301 --- Janet Jones Water in Grand but still a ways to overflow
3774 10 Oct 2016 @ 0939 --- ACarlson Sorry. No E time. Logger is not working.
3764 09 Oct 2016 @ 0756 --- SteveO Grand is empty
3732 01 Oct 2016 @ 0805 --- bhoppe Pool was in overflow, but was quite low during Turban eruption.
3717 26 Sep 2016 @ 0722 --- Kitt B Grand 0722 ie? hearing it from Beehive overlook
3714 25 Sep 2016 @ 0551 --- Betty Steam cloud in the right area, but it is too dark to be sure
3690 20 Sep 2016 @ 0755 --- JimS First water came into the pool.
3687 19 Sep 2016 @ 0640 --- JimS Pool in overflow.
3682 17 Sep 2016 @ 2242 --- ARoe Left Grand. Had not erupted yet.
3675 16 Sep 2016 @ 1505 --- Devin C. At 1500 the pool was full and waving. At 1502 Grand started splashing and doming about four times to 1-4 feet tall. It then died. Pool dropped and turban was at 1507.
3659 14 Sep 2016 @ 0727 --- JimS Pool in overflow at 727 when I returned from beehive.
3658 14 Sep 2016 @ 0659 --- JimS Almost in overflow at 0659.
3650 12 Sep 2016 @ 0701 --- JimS Already in overflow at 0701.
3644 11 Sep 2016 @ 0826 --- JimS Overflow started at 0826.
3643 11 Sep 2016 @ 0714 --- JimS Below overflow at 0714.
3613 07 Sep 2016 @ 0629 --- JimS Already in overflow when I arrived at 0629.
3607 06 Sep 2016 @ 0636 --- JimS Already in overflow when I arrived at 0636.
3602 05 Sep 2016 @ 0640 --- JimS Pool was already in overflow when I arrived at 0640.
3598 04 Sep 2016 @ 0628 --- JimS Pool empty. Turban and Vent quiet at 0628.
3594 02 Sep 2016 @ 0046 --- JarnoO Might've erupted. Visible steam for about 10 to 11 minutes.
3584 01 Sep 2016 @ 0530 01 Sep 2016 @ 0630 JimS Pool empty and Vent and Turban quiet at 0530. First water at 0630.
3577 31 Aug 2016 @ 0528 --- JimS In overflow at 0528.
3574 30 Aug 2016 @ 0538 --- JimS Pool in overflow.
3569 29 Aug 2016 @ 0615 --- JimS Empty. Turban ie but no Vent.
3571 29 Aug 2016 @ 0411 --- JarnoO Might've erupted. Duration was approximately 10 minutes
3527 22 Aug 2016 @ 1034 --- udo 11 minutes into Turban cycle Grand started full pool having waves.
3509 19 Aug 2016 @ 0626 --- JimS The pool at 0626 looks right for an eruption at about 0326.
3507 19 Aug 2016 @ 0326 --- Betty mentioned Grand ie at 0326
3451 09 Aug 2016 @ 0535 --- JimS Pool empty. Vent and Turban quiet.
3334 21 Jul 2016 @ 0610 --- JimS Overflow started 0610.
3311 18 Jul 2016 @ 0538 --- JimS Overflow from pool started at 0538.
EntrySourceLinkComment
04 Aug 2020 @ 1933 JSJ https://www.youtube.com/watch?v=sUq3QwqqLZk Video compilation showing Grand Geyser's 7:33 to 7:43 PM eruption on 4 August 2020.
06 Aug 2020 @ 1442 JSJ https://www.flickr.com/photos/jsjgeology/50213109327 Photo (out of 4) of Grand Geyser's 2:42 to 2:52 PM eruption on 6 August 2020.
25 Jul 2020 @ 1132 JSJ https://www.youtube.com/watch?v=cF1okeFGEbU Video of eruption.
02 May 2020 @ 2056 JoeN https://youtu.be/9bkNZP7Op8w 3 burst Grand
04 Apr 2020 @ 0934 JoeN https://youtu.be/-8WXc68IOd8 grand video
17 Mar 2020 @ 0915 ltgangi https://youtu.be/-yHg1pz44AY grand 03/17/2010
28 Feb 2020 @ 1219 JarnoO https://www.youtube.com/watch?v=gFsg-peggKo The video of this eruption.
18 Feb 2020 @ 1157 JarnoO https://www.youtube.com/watch?v=swxz4PHVB8w The eruption as seen from the webcam.
07 Jun 2018 @ 0713 JSJ https://www.flickr.com/photos/jsjgeology/41267057880 Photo (out of 3) of Grand Geyser's 7:13 to 7:25 AM eruption on 7 June 2018.
31 Jul 2017 @ 1608 JSJ https://www.youtube.com/watch?v=PVKlUye_S8A Time lapse video of Grand Geyser's afternoon eruption on 31 July 2017.
31 Jul 2017 @ 1608 JSJ https://www.flickr.com/photos/jsjgeology/35790098193 Photo (out of 6) of Grand Geyser's 4:08 to 4:20 PM eruption on 31 July 2017.
08 Jun 2016 @ 1409 JSJ https://www.flickr.com/photos/jsjgeology/31182392056 Thermal image (1 of 8) of Grand Geyser's 2:09 to 2:20 PM eruption on 8 June 2016.
08 Jun 2016 @ 1409 JSJ https://www.flickr.com/photos/jsjgeology/31182537916 Photo (1 of 12) of Grand Geyser's 2:09 to 2:20 PM eruption on 8 June 2016.
11 Aug 2016 @ 1454 JSJ https://www.flickr.com/photos/jsjgeology/29895281572 Photo (1 of 12) of Grand Geyser's 2:54 to 3:06 PM eruption on 11 August 2016.
15 Aug 2015 @ 1057 JSJ https://www.youtube.com/watch?v=5oFebRTTHA4#t=13m58s Clips 27-31 of this video compilation (time stamp 13:58 to the end) show Grand Geyser's 10:57 to 11:09 AM eruption on 15 August 2015.
07 Aug 2015 @ 1945 JSJ https://www.youtube.com/watch?v=5oFebRTTHA4#t=12m00s Clips 20-26 of this video compilation (time stamp 12:00 to 13:58) show Grand Geyser's 7:45 to 7:56 PM eruption on 7 August 2015.
06 Jul 2015 @ 1435 JSJ https://www.youtube.com/watch?v=5oFebRTTHA4#t=11m27s Clips 17-19 of this video compilation (time stamp 11:27 to 12:00) show Grand Geyser's 2:35 to 2:46 PM eruption on 6 July 2015.
20 May 2015 @ 1927 JSJ https://www.youtube.com/watch?v=5oFebRTTHA4#t=5m26s Clips 13-16 of this video compilation (time stamp 5:25 to 11:27) show Grand Geyser's 7:27 to 7:40 PM eruption on 20 May 2015.
18 May 2015 @ 1639 JSJ https://www.youtube.com/watch?v=5oFebRTTHA4 Clips 1-8 of this video compilation (time stamp 0:00 to 4:17) show Grand Geyser's 4:39 to 4:49 PM eruption on 18 May 2015.
04 Sep 2002 @ 1213 JSJ https://www.youtube.com/watch?v=oW-EWQ60ZwI Video of Grand Geyser's 12:10 PM eruption on 4 September 2002 - 3 bursts + afterburst.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool


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