Last Known Eruption
5h 48m ago
Predicted Next Eruption
Today at 0912 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
21 Sep 2018 @ 0236 wc---5h 46m
20 Sep 2018 @ 2050-1C5h 45m
20 Sep 2018 @ 150510m 40s D0/G1Q6h 7m
20 Sep 2018 @ 085811m G1Q6h 17m
20 Sep 2018 @ 0241 wc---5h 52m
19 Sep 2018 @ 204911m G1Q5h 58m
19 Sep 2018 @ 145110m 24s G2Q5h 30m
19 Sep 2018 @ 09219m 0s D1/G1C6h 46m
19 Sep 2018 @ 0235 wc---5h 52m
18 Sep 2018 @ 2043G2C6h 10m
18 Sep 2018 @ 143311m T2Q6h 5m
18 Sep 2018 @ 082811m G1-6h 20m
18 Sep 2018 @ 0208 wc---6h 28m
17 Sep 2018 @ 194011m 25s G1Q6h 5m
17 Sep 2018 @ 1335 wc-2-5h 33m
17 Sep 2018 @ 0802 wc-2-5h 56m
17 Sep 2018 @ 0206 wc---5h 59m
16 Sep 2018 @ 200710m 58s D0/G1Q5h 54m
16 Sep 2018 @ 141310m T1C6h 2m
16 Sep 2018 @ 08119m 55s G1Q6h 4m
16 Sep 2018 @ 0207 wc---6h 39m
15 Sep 2018 @ 1928-2-5h 41m
15 Sep 2018 @ 1347G1Q/---6h 9m
15 Sep 2018 @ 0738 wc-1-5h 59m
15 Sep 2018 @ 0139 wc---5h 53m
14 Sep 2018 @ 1945:289m 53s G1C5h 52m 48s
14 Sep 2018 @ 1352:4010m 15s G2Q5h 46m 15s
14 Sep 2018 @ 0806:258m 52s T1C5h 52m
14 Sep 2018 @ 0214 wc---5h 57m
13 Sep 2018 @ 201710m 30s G2C5h 31m
13 Sep 2018 @ 1445:359m 18s G1Q6h 6m
13 Sep 2018 @ 0839 wc-2-5h 42m
13 Sep 2018 @ 0257 E---6h 4m
12 Sep 2018 @ 2053-2-5h 40m
12 Sep 2018 @ 151311m 18s G2Q6h 8m
12 Sep 2018 @ 090511m 11s T2Q5h 39m
12 Sep 2018 @ 0326 wc---5h 36m
11 Sep 2018 @ 21509m 44s G1C5h 43m
11 Sep 2018 @ 160710m 40s G1C5h 45m
11 Sep 2018 @ 1022G1C/---5h 46m
11 Sep 2018 @ 0436 wc---6h 4m
10 Sep 2018 @ 2231:2812m 4s G2*Q5h 51m 39s
10 Sep 2018 @ 1639:4910m 44s G1Q6h 22m 48s
10 Sep 2018 @ 1017:0113m 13s G2*Q6h 32m
10 Sep 2018 @ 0345 wc---5h 40m
09 Sep 2018 @ 220511m T1C6h 3m
09 Sep 2018 @ 1602 wc11m 36s G2Q6h 3m
09 Sep 2018 @ 0958:1211m 36s G2Q5h 58m
09 Sep 2018 @ 0400 wc---5h 38m
08 Sep 2018 @ 2222 ? wc---5h 57m
08 Sep 2018 @ 1625-2-5h 37m
08 Sep 2018 @ 104810m 48s G2Q5h 46m
08 Sep 2018 @ 05026h 2m
07 Sep 2018 @ 2300-2C5h 54m
07 Sep 2018 @ 1705:5810m 46s -1Q7h 5m
07 Sep 2018 @ 100012m 11s G2Q5h 37m
07 Sep 2018 @ 0423 wc---6h 5m
06 Sep 2018 @ 2218 wc---5h 39m
06 Sep 2018 @ 16399m 12s G1C6h 20m
06 Sep 2018 @ 101911m 19s D0/G2*Q5h 56m
06 Sep 2018 @ 0423 wc---6h 1m
05 Sep 2018 @ 2222 wc---5h 57m
05 Sep 2018 @ 1624:0412m 12s G1Q6h 21m
05 Sep 2018 @ 1003 wc-1-6h 5m
05 Sep 2018 @ 035812m 3s G1Q6h 18m
04 Sep 2018 @ 2139:0311m 29s G1Q5h 48m
04 Sep 2018 @ 15518m 58s D1/T1C6h 4m
04 Sep 2018 @ 0947G1-6h 8m
04 Sep 2018 @ 033912m 15s T1Q6h 8m
03 Sep 2018 @ 2130:0711m 17s G1Q5h 41m 30s
03 Sep 2018 @ 1548:379m 44s G1C5h 52m 24s
03 Sep 2018 @ 0956:139m 17s G1C6h 1m
03 Sep 2018 @ 0355 wc-2-6h 14m
02 Sep 2018 @ 2141 wc---5h 53m
02 Sep 2018 @ 1547:1710m 4s T2Q6h 3m 15s
02 Sep 2018 @ 0944:0212m 3s G1Q6h 8m
02 Sep 2018 @ 0336 wc---6h 1m
01 Sep 2018 @ 2135 wc---6h 1m
01 Sep 2018 @ 1534T1Q6h 6m
01 Sep 2018 @ 092811m 24s D0/T1Q6h 10m
01 Sep 2018 @ 031810m 39s G1C5h 43m
31 Aug 2018 @ 2135 wc---5h 50m
31 Aug 2018 @ 1544:2010m 1s T1C5h 50m 45s
31 Aug 2018 @ 0953:359m 33s G1C6h 2m
31 Aug 2018 @ 0351 wc-2-5h 47m
30 Aug 2018 @ 2204-1-6h 20m
30 Aug 2018 @ 1544 wc---5h 55m
30 Aug 2018 @ 0948:4810m 9s G1C5h 51m
30 Aug 2018 @ 0357 wc---5h 52m
29 Aug 2018 @ 2205 wc---5h 40m
29 Aug 2018 @ 1625G1C6h 19m
29 Aug 2018 @ 100611m 12s G1Q6h 11m
29 Aug 2018 @ 0355 wc---5h 50m
28 Aug 2018 @ 2205 wc-2-5h 53m
28 Aug 2018 @ 1611:1710m 11s G1C6h 3m
28 Aug 2018 @ 10089m 42s G1C6h 22m
28 Aug 2018 @ 0346 wc---5h 53m
27 Aug 2018 @ 2153 wc---6h 23m
27 Aug 2018 @ 153010m G1Q6h 16m
27 Aug 2018 @ 091412m G1Q6h 10m

Interval Statistics

Interval Count100
Min5h 30m
Max7h 5m
Mean5h 59m
Median5h 58m
Grand-Specific
Start44G/11T (80% G)
Max Bursts2
Mean Bursts1.36
Median Bursts1
End34Q/22C (60.71% 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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