Last Known Eruption
3h 4m ago
Predicted Next Eruption
Today at 1856 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
04 Aug 2020 @ 1301:4411m 27s D0/T1Q5h 41m 33s
04 Aug 2020 @ 0720:119m 6s G1C7h 5m 9s
04 Aug 2020 @ 0015:029m 56s G1C6h 32m 42s
03 Aug 2020 @ 1742:2010m 58s D1/T1Q6h 21m
03 Aug 2020 @ 1121G2Q6h 0m
03 Aug 2020 @ 0521 wc-1-5h 38m
02 Aug 2020 @ 2342:309m 54s G2Q6h 6m 14s
02 Aug 2020 @ 1736:1610m 48s G1Q5h 50m 27s
02 Aug 2020 @ 1145:4910m 54s ---6h 12m
02 Aug 2020 @ 0533 wc-1-6h 48m
01 Aug 2020 @ 2245 wc-2-5h 46m
01 Aug 2020 @ 1658:3411m 6s G2Q6h 5m 48s
01 Aug 2020 @ 1052:469m 39s D0/G1C5h 51m
01 Aug 2020 @ 0501 wc-1-5h 47m
31 Jul 2020 @ 2313:4810m 45s G1Q7h 19m
31 Jul 2020 @ 1554 wc-1-6h 38m
31 Jul 2020 @ 0916---8h 12m
31 Jul 2020 @ 0104 wc---6h 5m
30 Jul 2020 @ 1859 ie wc---5h 53m
30 Jul 2020 @ 1306 wc---6h 58m
30 Jul 2020 @ 0608 wc---6h 16m
29 Jul 2020 @ 2352 wc-2-7h 13m
29 Jul 2020 @ 1639 ie wc-1-6h 39m
29 Jul 2020 @ 1000---6h 10m
29 Jul 2020 @ 0350 E---6h 5m
28 Jul 2020 @ 2145 E---5h 40m
28 Jul 2020 @ 1605---6h 7m
28 Jul 2020 @ 0958 wc---6h 1m
28 Jul 2020 @ 0357 E---6h 45m
27 Jul 2020 @ 2112 wc---5h 40m
27 Jul 2020 @ 1532 wc---5h 48m
27 Jul 2020 @ 0944 wc~10m 56s -1-6h 48m
27 Jul 2020 @ 0256 E---7h 30m
26 Jul 2020 @ 192610m 57s G1Q6h 18m
26 Jul 2020 @ 1308~11m G1Q6h 10m
26 Jul 2020 @ 0658 ie---6h 20m
26 Jul 2020 @ 0038 E---6h 2m
25 Jul 2020 @ 1836 ie wc---7h 4m
25 Jul 2020 @ 1132G1-6h 35m
25 Jul 2020 @ 0457 wc-1-6h 30m
24 Jul 2020 @ 2227 wc---7h 18m
24 Jul 2020 @ 1509 wc~10m 19s -2-6h 57m
24 Jul 2020 @ 08129m 57s G1Q6h 58m
24 Jul 2020 @ 0114 E---6h 0m
23 Jul 2020 @ 1914 wc-1-6h 9m
23 Jul 2020 @ 130511m 40s G1Q6h 58m
23 Jul 2020 @ 0607 wc---5h 52m
23 Jul 2020 @ 0015 E---7h 35m
22 Jul 2020 @ 1640---6h 37m
22 Jul 2020 @ 1003---6h 30m
22 Jul 2020 @ 0333 E---6h 2m
21 Jul 2020 @ 2131 wc-1-5h 40m
21 Jul 2020 @ 1551 wc-1-6h 15m
21 Jul 2020 @ 0936 wc-1-5h 10m
21 Jul 2020 @ 0426 wc---6h 46m
20 Jul 2020 @ 214010m 23s G1C6h 17m
20 Jul 2020 @ 1523 wc-1-
20 Jul 2020 @ 1523D5/G1Q7h 10m
20 Jul 2020 @ 0813 wc-1-7h 26m
20 Jul 2020 @ 0047 wc---6h 59m
19 Jul 2020 @ 1748 wc---5h 52m
19 Jul 2020 @ 115610m 45s D3/G1Q6h 51m
19 Jul 2020 @ 0505 wc---7h 2m
18 Jul 2020 @ 2203 wc---5h 59m
18 Jul 2020 @ 1604 wc---6h 5m
18 Jul 2020 @ 0959 wc---5h 56m
18 Jul 2020 @ 0403 wc---7h 32m
17 Jul 2020 @ 2031~12m G1Q6h 0m
17 Jul 2020 @ 143110m 9s G1C6h 42m
17 Jul 2020 @ 0749 wc-2-6h 8m
17 Jul 2020 @ 0141 E---5h 54m
16 Jul 2020 @ 194710m 28s G1Q6h 55m
16 Jul 2020 @ 125210m 30s T2Q5h 57m
16 Jul 2020 @ 06559m 31s G2C6h 15m
16 Jul 2020 @ 0040 ie wc---7h 4m
15 Jul 2020 @ 173611m 19s G1Q5h 59m
15 Jul 2020 @ 1137~9.75m G1Q5h 58m
15 Jul 2020 @ 0539 wc---6h 35m
14 Jul 2020 @ 2304 wc---5h 51m
14 Jul 2020 @ 17139m 16s D3/-1C7h 12m
14 Jul 2020 @ 1001---5h 44m
14 Jul 2020 @ 0417 wc-1-6h 37m
13 Jul 2020 @ 2140 wc-2-5h 38m
13 Jul 2020 @ 1602-1-6h 5m
13 Jul 2020 @ 0957-1-6h 57m
13 Jul 2020 @ 0300 E---6h 2m
12 Jul 2020 @ 2058~10.25m G1C7h 2m
12 Jul 2020 @ 1356G1-5h 55m
12 Jul 2020 @ 080110m 41s G1Q6h 21m
12 Jul 2020 @ 0140 wc---5h 37m
11 Jul 2020 @ 20039m 23s T2C6h 55m
11 Jul 2020 @ 130810m 14s G1C5h 54m
11 Jul 2020 @ 07149m 56s ---6h 45m
11 Jul 2020 @ 0029 E---6h 26m
10 Jul 2020 @ 180311m ---6h 16m
10 Jul 2020 @ 1147---6h 3m
10 Jul 2020 @ 0544 wc-2-5h 58m
09 Jul 2020 @ 2346 wc---5h 58m
09 Jul 2020 @ 1748~10m T1C6h 7m
09 Jul 2020 @ 1141---6h 47m

Interval Statistics

Interval Count99
Min5h 10m
Max8h 12m
Mean6h 23m
Median6h 15m
Grand-Specific
Start26G/5T (83.87% G)
Max Bursts2
Mean Bursts1.23
Median Bursts1
End19Q/11C (63.33% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
3288 11 Jul 2016 @ 0551 --- JimS Pool in overflow at 0551. Possibly start of overflow.
3287 11 Jul 2016 @ 0010 --- EmilyW Left at 0010. No eruption yet, left on good pool that did not produce eruption. Great overflow at early at 12 minute mark, dropped at 16 minute mark. Ridges when turban erupted. Previous two fills were poor.
3281 10 Jul 2016 @ 0542 --- JimS Pool in overflow.
3283 10 Jul 2016 @ 0012 --- JarnoO May have erupted. Duration was about 10 minutes
EntrySourceLinkComment
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.
28 Aug 2013 @ 1731 JSJ https://www.youtube.com/watch?v=Myae9uC9qp8 Video by Micah Kipple of the 2nd burst of Grand Geyser's late afternoon eruption on 28 August 2013.
28 Aug 2013 @ 1731 JSJ https://www.youtube.com/watch?v=mtjkvtfaPN8 Video by Micah Kipple of the initiation of Grand Geyser's 5:30 PM eruption on 28 August 2013.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool


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