Last Known Eruption
51m ago
Predicted Next Eruption
Today at 0839 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
14 Dec 2019 @ 0244 wc---6h 10m
13 Dec 2019 @ 2034 wc---5h 50m
13 Dec 2019 @ 1444 wc~9m 20s -1-5h 57m
13 Dec 2019 @ 0847 ie wc-1-12h 52m
12 Dec 2019 @ 1955 wc---6h 48m
12 Dec 2019 @ 1307 ie wc---6h 26m
12 Dec 2019 @ 0641 wc---12h 10m
11 Dec 2019 @ 1831 wc---6h 10m
11 Dec 2019 @ 1221 ie wc---6h 35m
11 Dec 2019 @ 0546 wc---6h 46m
10 Dec 2019 @ 2300 wc---6h 34m
10 Dec 2019 @ 1626 ns wc-2-6h 1m
10 Dec 2019 @ 1025 ns wc---6h 27m
10 Dec 2019 @ 0358 ie wc---6h 4m
09 Dec 2019 @ 2154 wc---7h 17m
09 Dec 2019 @ 1437 wc-1-6h 7m
09 Dec 2019 @ 0830 wc---6h 8m
09 Dec 2019 @ 0222 wc---13h 25m
08 Dec 2019 @ 1257 ie wc---13h 5m
07 Dec 2019 @ 2352 wc---5h 42m
07 Dec 2019 @ 1810 wc---5h 55m
07 Dec 2019 @ 1215 wc---6h 22m
07 Dec 2019 @ 0553 wc---6h 11m
06 Dec 2019 @ 2342 wc---6h 55m
06 Dec 2019 @ 1647 wc---6h 11m
06 Dec 2019 @ 1036 ns wc-1-6h 42m
06 Dec 2019 @ 0354 ie wc---5h 53m
05 Dec 2019 @ 2201 wc---6h 46m
05 Dec 2019 @ 1515 wc---20h 22m
04 Dec 2019 @ 1853 wc---6h 41m
04 Dec 2019 @ 1212 wc---7h 8m
04 Dec 2019 @ 0504 wc---6h 3m
03 Dec 2019 @ 2301 wc---6h 1m
03 Dec 2019 @ 1700 ie wc---6h 40m
03 Dec 2019 @ 1020 wc---6h 14m
03 Dec 2019 @ 0406 wc---6h 23m
02 Dec 2019 @ 2143 ie wc---5h 57m
02 Dec 2019 @ 1546 wc---6h 26m
02 Dec 2019 @ 0920 wc---12h 19m
01 Dec 2019 @ 2101 wc---6h 50m
01 Dec 2019 @ 1411 wc-1-6h 47m
01 Dec 2019 @ 0724 ie wc---6h 29m
01 Dec 2019 @ 0055 wc---7h 13m
30 Nov 2019 @ 1742 ie wc---1d 1h 1m
29 Nov 2019 @ 1641 ie wc---1d 14m
28 Nov 2019 @ 1627 wc---1d 27m
27 Nov 2019 @ 1600 wc-2-1d 0m
26 Nov 2019 @ 1600 ns wc-2-1d 32m
25 Nov 2019 @ 1528 wc---12h 16m
25 Nov 2019 @ 0312 ie wc---6h 2m
24 Nov 2019 @ 2110 wc---5h 47m
24 Nov 2019 @ 1523-1-6h 14m
24 Nov 2019 @ 0909 wc---19h 34m
23 Nov 2019 @ 1335G1Q6h 18m
23 Nov 2019 @ 0717 wc---13h 36m
22 Nov 2019 @ 1741 wc---6h 7m
22 Nov 2019 @ 1134T2Q19h 4m
21 Nov 2019 @ 163010m 53s G1Q5h 54m
21 Nov 2019 @ 1036 ns wc---6h 18m
21 Nov 2019 @ 0418 ie wc---12h 42m
20 Nov 2019 @ 1536 wc---6h 25m
20 Nov 2019 @ 0911 ns wc-1-6h 0m
20 Nov 2019 @ 0311 wc---12h 52m
19 Nov 2019 @ 1419 wc---5h 52m
19 Nov 2019 @ 0827 wc---6h 2m
19 Nov 2019 @ 0225 wc---11h 53m
18 Nov 2019 @ 143210m G1C6h 6m
18 Nov 2019 @ 082610m 1s G1C6h 38m
18 Nov 2019 @ 0148 wc---12h 4m
17 Nov 2019 @ 1344 ie wc-2-6h 29m
17 Nov 2019 @ 071510m 34s G1Q6h 1m
17 Nov 2019 @ 0114 wc---7h 17m
16 Nov 2019 @ 1757 wc---6h 15m
16 Nov 2019 @ 1142 wc---6h 13m
16 Nov 2019 @ 0529 ie wc---6h 0m
15 Nov 2019 @ 2329 wc---7h 13m
15 Nov 2019 @ 161613m 8s T1Q6h 9m
15 Nov 2019 @ 10079m 29s G1Q12h 49m
14 Nov 2019 @ 2118 wc---6h 25m
14 Nov 2019 @ 145310m 28s G1C6h 29m
14 Nov 2019 @ 08249m 46s D0/G1C6h 28m
14 Nov 2019 @ 0156 wc---6h 8m
13 Nov 2019 @ 1948 wc---5h 51m
13 Nov 2019 @ 13578m 48s T1C6h 28m
13 Nov 2019 @ 072911m 6s G1Q6h 5m
13 Nov 2019 @ 0124 wc---6h 27m
12 Nov 2019 @ 1857 wc---6h 56m
12 Nov 2019 @ 120111m 43s D0/G1Q5h 56m
12 Nov 2019 @ 0605 ie---5h 58m
12 Nov 2019 @ 0007 wc---6h 39m
11 Nov 2019 @ 17289m 37s T1C6h 14m
11 Nov 2019 @ 111411m 34s D2/T1Q7h 3m
11 Nov 2019 @ 0411 wc---6h 42m
10 Nov 2019 @ 2129 wc---6h 49m
10 Nov 2019 @ 14409m 41s G1C5h 41m
10 Nov 2019 @ 08599m 14s G1C6h 17m
10 Nov 2019 @ 0242 wc---5h 59m
09 Nov 2019 @ 2043 wc---6h 0m
09 Nov 2019 @ 14439m31T1Q6h 5m
09 Nov 2019 @ 08389m 32s G1C6h 3m

Interval Statistics

Interval Count100
Min5h 41m
Max1d 1h 1m
Mean8h 24m
Median6h 26m
Grand-Specific
Start13G/6T (68.42% G)
Max Bursts2
Mean Bursts1.17
Median Bursts1
End10Q/9C (52.63% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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 donĀ“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
3267 09 Jul 2016 @ 0520 --- JimS Pool already in overflow at 0520.
3269 09 Jul 2016 @ 0036 --- JarnoO May have erupted. Duration was about 10 minutes, even though it is really hard to see (fancy 360p video quality)
3254 08 Jul 2016 @ 0538 --- JimS Overflow from the pool started 0538.
3256 08 Jul 2016 @ 0056 --- JarnoO May have erupted. Last visible steam was about 10 to 11 minutes after noticing it.
EntrySourceLinkComment
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.
05 Jul 2013 @ 0849 JSJ https://www.youtube.com/watch?v=kYDQyexnLfI Video by Micah Kipple of the 5 July 2013 morning eruption of Grand Geyser.
28 Jun 2013 @ 0834 JSJ https://www.youtube.com/watch?v=MZjEKbivLug Video by Micah Kipple of the 28 June 2013 morning eruption of Grand Geyser.
06 Aug 2013 @ 1307 Micah Kipple https://www.flickr.com/photos/128128779@N05/15606907148 flickr
27 Jul 2014 @ 1538 Micah Kipple https://www.flickr.com/photos/joshy55013/15630773769 flickr
24 Sep 2014 @ 1256 Micah Kipple https://www.flickr.com/photos/126760153@N03/15828712802 flickr
20 Sep 2014 @ 1611 Micah Kipple https://www.flickr.com/photos/129696754@N08/15877864399 flickr
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool


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