Last Known Eruption
3h 7m ago
Predicted Next Eruption
Aug 19 at 0049 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
18 Aug 2019 @ 1856 ie wc---6h 13m
18 Aug 2019 @ 1243~12m G1Q6h 19m
18 Aug 2019 @ 0624 wc---6h 3m
18 Aug 2019 @ 0021 ie wc---6h 24m
17 Aug 2019 @ 175710m 54s T1Q7h 40m
17 Aug 2019 @ 1017D1/G2Q5h 53m
17 Aug 2019 @ 0424 ie wc---6h 55m
16 Aug 2019 @ 21299m 44s G1C5h 52m
16 Aug 2019 @ 153710m 25s G--5h 56m
16 Aug 2019 @ 0941D0/G1C5h 55m
16 Aug 2019 @ 0346 ie wc---5h 37m
15 Aug 2019 @ 22099m 43s G1C6h 3m
15 Aug 2019 @ 1606---6h 19m
15 Aug 2019 @ 0947 ie wc---6h 1m
15 Aug 2019 @ 0346 ie wc---5h 48m
14 Aug 2019 @ 21589m 22s G1C6h 31m
14 Aug 2019 @ 152711m 9s G2Q6h 2m
14 Aug 2019 @ 09259m 44s D2/G1C6h 16m
14 Aug 2019 @ 0309 wc---6h 1m
13 Aug 2019 @ 2108 ns wc---6h 9m
13 Aug 2019 @ 145910.5m G1Q8h 14m
13 Aug 2019 @ 0645 ie wc---6h 9m
13 Aug 2019 @ 00369m 20s T1C6h 15m
12 Aug 2019 @ 1821~11m D1/G1C6h 1m
12 Aug 2019 @ 1220---5h 26m
12 Aug 2019 @ 0654 wc---5h 22m
12 Aug 2019 @ 0132 ie wc---5h 50m
11 Aug 2019 @ 1942 E---5h 30m
11 Aug 2019 @ 141210m G1C5h 27m
11 Aug 2019 @ 0845 ie---5h 41m
11 Aug 2019 @ 0304 E---5h 24m
10 Aug 2019 @ 214011m 3s G1Q5h 13m
10 Aug 2019 @ 16279m 5s T1C5h 54m
10 Aug 2019 @ 103311m 49s T1Q5h 18m
10 Aug 2019 @ 0515 E---5h 8m
10 Aug 2019 @ 0007 ie wc---5h 14m
09 Aug 2019 @ 185312m 4s G1Q6h 16m
09 Aug 2019 @ 123711m 39s G1Q5h 43m
09 Aug 2019 @ 0654 wc---4h 59m
09 Aug 2019 @ 0155 E---5h 30m
08 Aug 2019 @ 20259m 20s G1C5h 24m
08 Aug 2019 @ 1500:3910m 27s G1C5h 40m 23s
08 Aug 2019 @ 0920:1612m 23s G1Q5h 10m
08 Aug 2019 @ 0410 E---5h 10m
07 Aug 2019 @ 2259:4311m 0s G1C5h 12m 32s
07 Aug 2019 @ 1747:1110m 32s D0/G1C5h 11m 18s
07 Aug 2019 @ 1235:5310m 7s G1Q5h 33m 3s
07 Aug 2019 @ 0702:508m 57s T2C6h 0m 42s
07 Aug 2019 @ 0102:0810m 7s G1C5h 35m 17s
06 Aug 2019 @ 1926:519m 18s D0/G1C5h 1m 0s
06 Aug 2019 @ 1425:5110m 35s G1C5h 18m 58s
06 Aug 2019 @ 0906:5311m 1s G1C5h 48m
06 Aug 2019 @ 0318 E---5h 8m
05 Aug 2019 @ 22109m T1C5h 18m
05 Aug 2019 @ 1651:1610m 56s D0/G1Q5h 44m 43s
05 Aug 2019 @ 1106:3310m 38s D3/G1C6h 26m
05 Aug 2019 @ 0440 ie wc---6h 25m
04 Aug 2019 @ 2215 ie wc---7h 25m
04 Aug 2019 @ 1449:569m 1s G1C6h 12m 18s
04 Aug 2019 @ 0837:389m 46s T2C5h 41m
04 Aug 2019 @ 0256 ? ie wc---6h 8m
03 Aug 2019 @ 204810m 8s D2/T1Q6h 33m
03 Aug 2019 @ 1415T1C6h 18m
03 Aug 2019 @ 0756:0710m 58s T1Q11h 42m 13s
02 Aug 2019 @ 2013:5410m 30s T1C6h 18m
02 Aug 2019 @ 1355T1C6h 6m
02 Aug 2019 @ 074910m 32s G1C6h 38m
02 Aug 2019 @ 0111 E---5h 57m
01 Aug 2019 @ 191411m 1s T2Q6h 28m
01 Aug 2019 @ 124610m 17s D0/G2Q5h 50m
01 Aug 2019 @ 06569m 55s D2/T1C12h 43m
31 Jul 2019 @ 181311m 38s T1Q6h 45m
31 Jul 2019 @ 112811m 30s D1D0/G1Q6h 2m
31 Jul 2019 @ 0526 wc---5h 51m
30 Jul 2019 @ 2335 ? ie wc---5h 50m
30 Jul 2019 @ 174510m 17s D2/T1C6h 39m
30 Jul 2019 @ 110611:20G1Q5h 57m
30 Jul 2019 @ 0509 ie wc---6h 32m
29 Jul 2019 @ 2237 E---5h 50m
29 Jul 2019 @ 1647 ns wc-2-5h 46m
29 Jul 2019 @ 110110.5m G1C5h 46m
29 Jul 2019 @ 0515 ns wc---5h 53m
28 Jul 2019 @ 2322 ? ie wc---5h 36m
28 Jul 2019 @ 174610m 28s G1C6h 19m
28 Jul 2019 @ 112712m 12s D4/G1Q6h 21m
28 Jul 2019 @ 0506 ie wc---12h 31m
27 Jul 2019 @ 163514m 21s G1Q5h 40m
27 Jul 2019 @ 10559m 31s G1Q5h 43m
27 Jul 2019 @ 0512 E---6h 1m
26 Jul 2019 @ 2310:2611m 15s G2Q6h 9m
26 Jul 2019 @ 170110m 30s D1/G2Q6h 13m
26 Jul 2019 @ 104810m 50s D0/G1C5h 34m
26 Jul 2019 @ 0514 ie wc---6h 12m
25 Jul 2019 @ 230211m G1Q6h 2m
25 Jul 2019 @ 170011m 2s D0/G1Q5h 41m
25 Jul 2019 @ 111910m 16s D0/G2C6h 3m
25 Jul 2019 @ 0516 wc---11h 46m
24 Jul 2019 @ 1730---7h 2m
24 Jul 2019 @ 102811m G1Q5h 48m
24 Jul 2019 @ 0440 E---6h 13m

Interval Statistics

Interval Count100
Min4h 59m
Max12h 43m
Mean6h 12m
Median5h 57m
Grand-Specific
Start46G/16T (74.19% G)
Max Bursts2
Mean Bursts1.18
Median Bursts1
End32C/29Q (52.46% C)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
3234 07 Jul 2016 @ 0514 --- JimS Pool empty. Vent and Turban quiet.
3209 05 Jul 2016 @ 0524 --- JimS Pool empty. Vent and Turban quiet.
3187 03 Jul 2016 @ 0500 --- Graham In overflow.
3163 01 Jul 2016 @ 0530 --- JimS Pool in overflow at 0530.
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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