Last Known Eruption
6m ago
Predicted Next Eruption
Apr 10 at 0132 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
09 Apr 2020 @ 1937 ns wc---6h 14m
09 Apr 2020 @ 1323 ie wc---6h 10m
09 Apr 2020 @ 0713 wc---6h 24m
09 Apr 2020 @ 0049 wc---5h 25m
08 Apr 2020 @ 1924 wc---5h 54m
08 Apr 2020 @ 1330 wc-1-7h 28m
08 Apr 2020 @ 0602 wc---5h 45m
08 Apr 2020 @ 0017 wc---5h 47m
07 Apr 2020 @ 1830 wc-1-6h 8m
07 Apr 2020 @ 1222 wc~9½m-1-5h 57m
07 Apr 2020 @ 0625 ie wc---6h 51m
06 Apr 2020 @ 2334 wc---6h 11m
06 Apr 2020 @ 1723 wc-1-6h 23m
06 Apr 2020 @ 1100 wc-1-12h 47m
05 Apr 2020 @ 2213 wc---6h 4m
05 Apr 2020 @ 1609 wc-2-6h 11m
05 Apr 2020 @ 0958 wc-1-6h 17m
05 Apr 2020 @ 0341 wc---6h 6m
04 Apr 2020 @ 2135 wc---5h 27m
04 Apr 2020 @ 160810:07D2/G1C6h 34m
04 Apr 2020 @ 09349:47G3C6h 11m
04 Apr 2020 @ 0323 wc---6h 16m
03 Apr 2020 @ 2107 wc-2-6h 23m
03 Apr 2020 @ 1444 wc-1-6h 6m
03 Apr 2020 @ 0838 wc---6h 7m
03 Apr 2020 @ 0231 wc---6h 5m
02 Apr 2020 @ 2026 ie wc---5h 35m
02 Apr 2020 @ 1451 ie wc-2-11h 55m
02 Apr 2020 @ 0256 wc---12h 36m
01 Apr 2020 @ 1420 ie wc---5h 37m
01 Apr 2020 @ 0843 ns wc---5h 51m
01 Apr 2020 @ 0252 wc---6h 2m
31 Mar 2020 @ 2050 wc---1d 2h 6m
30 Mar 2020 @ 1844 ie wc---6h 55m
30 Mar 2020 @ 1149 wc---7h 13m
30 Mar 2020 @ 0436 wc---6h 13m
29 Mar 2020 @ 2223 wc---6h 12m
29 Mar 2020 @ 1611 wc-2-6h 37m
29 Mar 2020 @ 093410:44G1Q6h 35m
29 Mar 2020 @ 0259 wc---6h 37m
28 Mar 2020 @ 2022 ie wc---5h 50m
28 Mar 2020 @ 1432 ns wc---5h 56m
28 Mar 2020 @ 0836 ie wc---5h 50m
28 Mar 2020 @ 0246 wc---6h 9m
27 Mar 2020 @ 2037 wc---6h 4m
27 Mar 2020 @ 1433 ie wc---17h 58m
26 Mar 2020 @ 2035 wc---6h 4m
26 Mar 2020 @ 1431 wc-1-6h 5m
26 Mar 2020 @ 0826 ie wc---12h 13m
25 Mar 2020 @ 2013 wc---6h 34m
25 Mar 2020 @ 1339 ie wc-1-11h 23m
25 Mar 2020 @ 0216 wc---17h 45m
24 Mar 2020 @ 0831 ns wc---6h 3m
24 Mar 2020 @ 0228 wc---6h 50m
23 Mar 2020 @ 1938 ie wc---5h 58m
23 Mar 2020 @ 1340 wc-1-5h 55m
23 Mar 2020 @ 0745 wc---11h 51m
22 Mar 2020 @ 1954 wc---6h 45m
22 Mar 2020 @ 1309 wc-1-6h 33m
22 Mar 2020 @ 0636 wc---5h 51m
22 Mar 2020 @ 0045 ie wc---5h 58m
21 Mar 2020 @ 1847 wc---5h 42m
21 Mar 2020 @ 1305 ie wc---6h 23m
21 Mar 2020 @ 0642 ie wc---11h 55m
20 Mar 2020 @ 1847 wc---6h 26m
20 Mar 2020 @ 1221 wc---11h 57m
20 Mar 2020 @ 0024 wc---6h 57m
19 Mar 2020 @ 1727 wc---6h 7m
19 Mar 2020 @ 1120 wc---19h 28m
18 Mar 2020 @ 1552 ie wc>8m -2*-12h 14m
18 Mar 2020 @ 0338 wc---11h 29m
17 Mar 2020 @ 1609 wc---6h 54m
17 Mar 2020 @ 0915 wc---18h 47m
16 Mar 2020 @ 1428 ie wc---1d 18h 28m
14 Mar 2020 @ 2000 ? ie wc---12h 49m
14 Mar 2020 @ 0711 E---5h 58m
14 Mar 2020 @ 0113 wc-2-6h 22m
13 Mar 2020 @ 1851 wc---6h 31m
13 Mar 2020 @ 1220 wc---5h 44m
13 Mar 2020 @ 0636 wc---6h 13m
13 Mar 2020 @ 0023 wc---6h 3m
12 Mar 2020 @ 1820 wc-1-5h 50m
12 Mar 2020 @ 1230 wc-1-5h 51m
12 Mar 2020 @ 0639 E---6h 4m
12 Mar 2020 @ 0035 E---5h 53m
11 Mar 2020 @ 1842 wc-1-6h 50m
11 Mar 2020 @ 1152 wc-2-6h 0m
11 Mar 2020 @ 0552 ns wc-1-5h 45m
11 Mar 2020 @ 0007 ns wc---5h 58m
10 Mar 2020 @ 1809 ns wc-1-6h 10m
10 Mar 2020 @ 1159 wc---6h 20m
10 Mar 2020 @ 0539 wc-2-5h 55m
09 Mar 2020 @ 2344 wc---6h 36m
09 Mar 2020 @ 1708 ns wc-1-7h 7m
09 Mar 2020 @ 1001 ie wc-1-6h 13m
09 Mar 2020 @ 0348 wc---6h 5m
08 Mar 2020 @ 2143 wc---5h 57m
08 Mar 2020 @ 1546 ie wc---6h 5m
08 Mar 2020 @ 0941 ns---6h 56m
08 Mar 2020 @ 0145 E---6h 3m

Interval Statistics

Interval Count100
Min5h 25m
Max1d 18h 28m
Mean7h 54m
Median6h 11m
Grand-Specific
Start3G/0T (100% G)
Max Bursts3
Mean Bursts1.35
Median Bursts1
End2C/1Q (66.67% C)

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 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
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
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.
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.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool


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