Last Known Eruption
2h 3m ago
Predicted Next Eruption
Today at 2005 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
19 Oct 2018 @ 1329G1Q5h 23m
19 Oct 2018 @ 0806 ? ie wc---6h 45m
19 Oct 2018 @ 0121 wc---5h 59m
18 Oct 2018 @ 1922 wc-2-6h 0m
18 Oct 2018 @ 1322 wc-1-5h 46m
18 Oct 2018 @ 0736 wc---5h 46m
18 Oct 2018 @ 0150 wc---5h 33m
17 Oct 2018 @ 2017 wc-1-5h 51m
17 Oct 2018 @ 1426 wc-2-5h 39m
17 Oct 2018 @ 0847G1-6h 39m
17 Oct 2018 @ 0208 wc---5h 49m
16 Oct 2018 @ 2019 ns wc---5h 49m
16 Oct 2018 @ 1430-2-5h 55m
16 Oct 2018 @ 0835 wc---6h 22m
16 Oct 2018 @ 0213 wc-2-5h 52m
15 Oct 2018 @ 2020:109m 52s D2/G1C6h 35m
15 Oct 2018 @ 1345 wc-2-6h 3m
15 Oct 2018 @ 0742 ie wc---6h 17m
15 Oct 2018 @ 0125 wc---5h 51m
14 Oct 2018 @ 1934 wc-2-5h 49m
14 Oct 2018 @ 1345 wc-2-6h 1m
14 Oct 2018 @ 0744 wc---5h 54m
14 Oct 2018 @ 0150 wc---6h 33m
13 Oct 2018 @ 1917 wc---5h 46m
13 Oct 2018 @ 1330:119m 21s G1C5h 51m
13 Oct 2018 @ 0739 wc-1-5h 56m
13 Oct 2018 @ 0143 wc---5h 35m
12 Oct 2018 @ 2008 wc---5h 53m
12 Oct 2018 @ 1414:1812m 18s D0/T1Q5h 59m 59s
12 Oct 2018 @ 0814:1911m 35s G1Q5h 54m
12 Oct 2018 @ 0220 wc---6h 1m
11 Oct 2018 @ 2019 wc---5h 42m
11 Oct 2018 @ 1436:0610m 10s G1C6h 22m 53s
11 Oct 2018 @ 0813:1311m 13s G1Q5h 54m
11 Oct 2018 @ 0219 E---5h 56m
10 Oct 2018 @ 2023 wc---5h 57m
10 Oct 2018 @ 142611m 30s T1Q5h 38m
10 Oct 2018 @ 0847:4410m 30s 5h 52m
10 Oct 2018 @ 0255 wc---5h 44m
09 Oct 2018 @ 2111 wc---6h 5m
09 Oct 2018 @ 1506---6h 4m
09 Oct 2018 @ 090211m G1Q11h 11m
08 Oct 2018 @ 2151 wc---5h 45m
08 Oct 2018 @ 1605:4911m 14s G1Q6h 0m
08 Oct 2018 @ 1005 ie wc---5h 54m
08 Oct 2018 @ 0411 E---6h 10m
07 Oct 2018 @ 2201 wc---5h 59m
07 Oct 2018 @ 1602 wc-1-5h 28m
07 Oct 2018 @ 1034 wc-2-5h 36m
07 Oct 2018 @ 0458 E---5h 55m
06 Oct 2018 @ 2303 wc---6h 13m
06 Oct 2018 @ 165012m G2-6h 25m
06 Oct 2018 @ 1025-1Q7h 4m
06 Oct 2018 @ 0321 wc---5h 52m
05 Oct 2018 @ 2129 wc---5h 35m
05 Oct 2018 @ 155410m 8s G2C6h 1m
05 Oct 2018 @ 0953 ns---5h 50m
05 Oct 2018 @ 0403 E---6h 10m
04 Oct 2018 @ 2153 wc---5h 45m
04 Oct 2018 @ 1608 wc---6h 11m
04 Oct 2018 @ 0957 E---5h 57m
04 Oct 2018 @ 0400 wc---5h 38m
03 Oct 2018 @ 2222 wc---6h 12m
03 Oct 2018 @ 161012m 36s G2*Q5h 46m
03 Oct 2018 @ 10249m 43s G2Q5h 52m
03 Oct 2018 @ 0432 wc---6h 24m
02 Oct 2018 @ 2208 ie---6h 34m
02 Oct 2018 @ 153411m 48s T2*Q6h 19m
02 Oct 2018 @ 091511m G1Q6h 20m
02 Oct 2018 @ 0255 wc---5h 59m
01 Oct 2018 @ 2056 E---5h 58m
01 Oct 2018 @ 14589m 53s G1C5h 52m
01 Oct 2018 @ 0906G1C11h 54m
30 Sep 2018 @ 2112 wc---5h 37m
30 Sep 2018 @ 1535---5h 59m
30 Sep 2018 @ 0936 wc---5h 45m
30 Sep 2018 @ 0351 wc---5h 41m
29 Sep 2018 @ 2210 wc---5h 58m
29 Sep 2018 @ 161210m 54s G1Q6h 18m
29 Sep 2018 @ 0954~10m 20s -1C5h 21m
29 Sep 2018 @ 0433 wc---5h 18m
28 Sep 2018 @ 2315 wc---5h 44m
28 Sep 2018 @ 1731~13m G1Q5h 45m
28 Sep 2018 @ 1146~11m T1Q5h 58m
28 Sep 2018 @ 054811m 17s G1Q6h 9m
27 Sep 2018 @ 2339 wc---6h 5m
27 Sep 2018 @ 173411m 14s G1Q6h 0m
27 Sep 2018 @ 113411m 31s G1Q5h 55m
27 Sep 2018 @ 0539 wc---6h 10m
26 Sep 2018 @ 2329 wc---7h 4m
26 Sep 2018 @ 162510m 20s G1Q5h 56m
26 Sep 2018 @ 102910m 21s G1C6h 6m
26 Sep 2018 @ 0423 wc-1-6h 39m
25 Sep 2018 @ 214411m T1Q6h 6m
25 Sep 2018 @ 153811m 28s G1Q6h 4m
25 Sep 2018 @ 093411m 29s D0/G2Q5h 57m
25 Sep 2018 @ 0337 wc-2-5h 38m
24 Sep 2018 @ 21599m 45s T2C5h 54m
24 Sep 2018 @ 160510m 47s -2-6h 17m
24 Sep 2018 @ 094810m 25s G1C6h 13m

Interval Statistics

Interval Count100
Min5h 18m
Max11h 54m
Mean6h 5m
Median5h 57m
Grand-Specific
Start26G/6T (81.25% G)
Max Bursts2
Mean Bursts1.33
Median Bursts1
End22Q/10C (68.75% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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 White 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 --- DGInc 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 --- DGInc 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 --- DGInc 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 --- DGInc 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 --- DGInc 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.
3135 26 Jun 2016 @ 0247 --- DaveM Appeared to be post eruptive at 0247 when web camera restarted
3133 25 Jun 2016 @ 0601 --- JimS Start of overflow.
3130 24 Jun 2016 @ 0214 24 Jun 2016 @ 0246 DGInc May have erupted during the nightly reset of the webcam. Some steam was visible in that area (maybe Turban and Vent continued until 0323?) and I haven't seen a Grand before or after the interuption.
3083 17 Jun 2016 @ 0511 --- JimS Pool in overflow at 0511.
3077 16 Jun 2016 @ 0533 --- JimS Pool in overflow, Turban ie at 0533.
3055 12 Jun 2016 @ 0512 --- JimS Pool in overflow, no eruption yet.
3045 11 Jun 2016 @ 0508 --- JimS Some water in pool but well below overflow.
3033 10 Jun 2016 @ 0506 --- JimS Pool empty, Turban ie.
3016 09 Jun 2016 @ 0545 --- JimS First ? water into the pool at 0545.
3015 09 Jun 2016 @ 0504 --- JimS Pool empty, Vent and Turban quiet.
3003 07 Jun 2016 @ 0117 --- DGInc May have erupted @ 0117
2989 06 Jun 2016 @ 0530 --- JimS First ? water came into the pool.
2987 06 Jun 2016 @ 0515 --- JimS Pool empty, Vent and Turban quiet.
2969 05 Jun 2016 @ 0519 --- JimS First ? water into three pool at 0519.
2968 05 Jun 2016 @ 0515 --- JimS Pool empty, Turban and Vent quiet.
2944 02 Jun 2016 @ 0518 --- JimS Pool in overflow on my arrival at 0518.
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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