Last Known Eruption
10m ago
Predicted Next Eruption
Today at 1950 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
25 Oct 2021 @ 1307 ie---5h 50m
25 Oct 2021 @ 0717 wc-1-6h 22m
25 Oct 2021 @ 0055 wc---7h 27m
24 Oct 2021 @ 1728 wc---7h 39m
24 Oct 2021 @ 0949 wc---7h 46m
24 Oct 2021 @ 0203 wc---6h 17m
23 Oct 2021 @ 1946 E---7h 28m
23 Oct 2021 @ 1218---6h 8m
23 Oct 2021 @ 0610 wc-1-6h 8m
23 Oct 2021 @ 0002 wc-2-6h 32m
22 Oct 2021 @ 1730 wc~10m 26s -1-6h 30m
22 Oct 2021 @ 1100---6h 42m
22 Oct 2021 @ 0418 ns wc---6h 55m
21 Oct 2021 @ 2123 wc---7h 4m
21 Oct 2021 @ 1419 ie---6h 36m
21 Oct 2021 @ 0743 wc-1-6h 3m
21 Oct 2021 @ 0140 wc-2-6h 22m
20 Oct 2021 @ 1918 wc---6h 24m
20 Oct 2021 @ 125412m G1Q6h 39m
20 Oct 2021 @ 0615 wc---6h 36m
19 Oct 2021 @ 2339 wc-2-6h 43m
19 Oct 2021 @ 165610m G1C6h 1m
19 Oct 2021 @ 1055 wc-2-6h 4m
19 Oct 2021 @ 0451 wc-2-6h 25m
18 Oct 2021 @ 2226 wc-2-7h 13m
18 Oct 2021 @ 151310m ---5h 51m
18 Oct 2021 @ 0922 ie---6h 4m
18 Oct 2021 @ 0318 wc---7h 17m
17 Oct 2021 @ 2001G--5h 51m
17 Oct 2021 @ 1410 ie---6h 3m
17 Oct 2021 @ 0807 E---5h 54m
17 Oct 2021 @ 0213 E---6h 15m
16 Oct 2021 @ 19589m 47s T1C6h 25m
16 Oct 2021 @ 133310m 3s G1Q6h 14m
16 Oct 2021 @ 0719 wc-1-6h 7m
16 Oct 2021 @ 0112 wc---6h 20m
15 Oct 2021 @ 1852 wc-1-6h 4m
15 Oct 2021 @ 12489m 37s G1C6h 27m
15 Oct 2021 @ 0621 wc---6h 19m
15 Oct 2021 @ 0002 wc-1-6h 9m
14 Oct 2021 @ 1753 ie wc---7h 3m
14 Oct 2021 @ 105011m 1s T1Q8h 19m
14 Oct 2021 @ 0231 E---5h 58m
13 Oct 2021 @ 2033 E---5h 42m
13 Oct 2021 @ 1451 wc-2-6h 3m
13 Oct 2021 @ 0848 ie wc---5h 56m
13 Oct 2021 @ 0252 E---5h 55m
12 Oct 2021 @ 2057 ie wc---6h 33m
12 Oct 2021 @ 1424 ns---5h 41m
12 Oct 2021 @ 0843 E---6h 10m
12 Oct 2021 @ 0233 E---5h 50m
11 Oct 2021 @ 2043 E---5h 48m
11 Oct 2021 @ 145510m26mG2C6h 45m
11 Oct 2021 @ 0810 ns wc-1-6h 37m
11 Oct 2021 @ 0133 wc---6h 5m
10 Oct 2021 @ 192810m 13s G1C6h 16m
10 Oct 2021 @ 131210m 14s G1C6h 18m
10 Oct 2021 @ 0654 wc-1-5h 57m
10 Oct 2021 @ 0057 wc---6h 6m
09 Oct 2021 @ 185111m 49s G21Q6h 5m
09 Oct 2021 @ 124610m G1C5h 57m
09 Oct 2021 @ 0649 wc-1-6h 10m
09 Oct 2021 @ 0039 E---6h 16m
08 Oct 2021 @ 1823 ns-1C6h 9m
08 Oct 2021 @ 1214 wc~11m 58s -1-6h 7m
08 Oct 2021 @ 0607 E---6h 8m
07 Oct 2021 @ 2359 E---6h 24m
07 Oct 2021 @ 173511.4m G1Q6h 37m
07 Oct 2021 @ 105811m G1Q6h 21m
07 Oct 2021 @ 0437 E---6h 20m
06 Oct 2021 @ 2217 E---7h 25m
06 Oct 2021 @ 145211m 46s T2*Q6h 37m
06 Oct 2021 @ 08159m T2C6h 32m
06 Oct 2021 @ 0143 E---6h 8m
05 Oct 2021 @ 193511m G1Q6h 15m
05 Oct 2021 @ 1320G1Q6h 12m
05 Oct 2021 @ 0708 E---6h 18m
05 Oct 2021 @ 0050 E---6h 38m
04 Oct 2021 @ 181212m G1C6h 10m
04 Oct 2021 @ 1202G2*Q5h 53m
04 Oct 2021 @ 0609 wc-1-6h 39m
03 Oct 2021 @ 2330 wc---6h 25m
03 Oct 2021 @ 1705G1Q6h 1m
03 Oct 2021 @ 110410m 56s G1Q6h 10m
03 Oct 2021 @ 0454 E---6h 1m
02 Oct 2021 @ 2253 E---6h 54m
02 Oct 2021 @ 155911m G1Q6h 12m
02 Oct 2021 @ 094710m 23s G2Q6h 13m
02 Oct 2021 @ 0334 E---6h 18m
01 Oct 2021 @ 2116 E---5h 53m
01 Oct 2021 @ 152311m 2s G2Q6h 7m
01 Oct 2021 @ 09169m 48s G2Q6h 14m
01 Oct 2021 @ 0302 wc---7h 0m
30 Sep 2021 @ 2002 wc---5h 57m
30 Sep 2021 @ 1404:5710m 44s T2Q7h 10m
30 Sep 2021 @ 065410m 10s T1Q6h 38m
30 Sep 2021 @ 0016 wc---6h 8m
29 Sep 2021 @ 180811m 11s G2Q6h 30m
29 Sep 2021 @ 1137:4312m 14s G1Q6h 57m
29 Sep 2021 @ 0440 wc---6h 44m

Interval Statistics

Interval Count100
Min5h 41m
Max8h 19m
Mean6h 23m
Median6h 16m
Grand-Specific
Start25G/6T (80.65% G)
Max Bursts2
Mean Bursts1.36
Median Bursts1
End20Q/11C (64.52% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
19499 12 Sep 2021 @ 0630 --- Graham Empty. gently steaming.
18871 09 Aug 2021 @ 0604 --- JimS Pool empty.
18863 08 Aug 2021 @ 0709 --- JimS Overflow from pool just starting at 0709. Agrees with an eruption around 3 AM.
18559 21 Jul 2021 @ 0702 --- SteveO 1st overflow.
18540 20 Jul 2021 @ 0556 --- JimS Pool well below overflow.
18464 17 Jul 2021 @ 0535 --- SteveO Grand is quiet and empty.
18360 11 Jul 2021 @ 1310 --- User34 First overflow around this time
18196 30 Jun 2021 @ 0538 --- JimS Pool empty and Turban and Vent quiet. Post eruptive.
18079 25 Jun 2021 @ 0537 --- JimS Pool empty and Turban and Vent quiet. Post eruptive.
17951 21 Jun 2021 @ 0624 --- K.Cooper Dry and steaming, post eruption
17897 18 Jun 2021 @ 1517 --- Micah Kipple First OF
17650 11 Jun 2021 @ 0608 --- JimS Pool has water but below overflow. Probably erupted around 0300.
17014 08 May 2021 @ 1829 --- Ajw 1 m pause at 1837
16991 06 May 2021 @ 0817 --- JimS Pool is not yet in overflow at this time.
16989 06 May 2021 @ 0744 --- Micah Kipple Grand's pool is still far below overflow. I am uncertain if there is even water visible. If there is it is just barely above the Vent level and quiet. No boiling or turbulence observed. Update 0749: water just barely visible from near Rift.
16502 04 Nov 2020 @ 1147 --- JarnoO (wc) Appears to be post-eruptive, with constant (sometimes big) steam rising for at least the previous 30 minutes or so.
16501 03 Nov 2020 @ 1531 --- JarnoO (wc) Appears to be post-eruptive, with constant steam for at least 25 minutes observed.
16243 24 Sep 2020 @ 0921 --- PamW Pool pretty empty looking.
16017 07 Sep 2020 @ 2015 --- William post eruptive, turban and vent off
15415 06 Aug 2020 @ 1715 --- JSJ Pool level visible again.
15413 06 Aug 2020 @ 1442 06 Aug 2020 @ 1452 JSJ Inclinometer readings: highest water during Grand Geyser's first "burst" = ~160 feet; highest water during second "burst" = ~149 feet.
15371 04 Aug 2020 @ 1933 04 Aug 2020 @ 1943 JSJ Inclinometer reading: highest water during 1st "burst" & 2nd "burst": 183 feet.
14753 28 Jun 2020 @ 0910 --- JarnoO (wc) post-eruptive (eruption was probably C) when cam panned back to downbasin after Old Faithful.
14588 10 Jun 2020 @ 2144 --- K.Cooper No Grand yet, Rift stopped
14577 10 Jun 2020 @ 0709 --- K.Cooper pool in overflow, overflow is increasing
14233 23 May 2020 @ 1347 --- Suzanne boop 1 ft high at 13:47:53. did not see previous Turban but suspect we are in a delay.
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.
EntrySourceLinkComment
17 May 2021 @ 0059 JoeN https://i.imgur.com/ZgC53Oh.png Grand 0059
04 Aug 2020 @ 1933 JSJ https://www.youtube.com/watch?v=sUq3QwqqLZk Video compilation showing Grand Geyser's 7:33 to 7:43 PM eruption on 4 August 2020.
06 Aug 2020 @ 1442 JSJ https://www.flickr.com/photos/jsjgeology/50213109327 Photo (out of 4) of Grand Geyser's 2:42 to 2:52 PM eruption on 6 August 2020.
25 Jul 2020 @ 1132 JSJ https://www.youtube.com/watch?v=cF1okeFGEbU Video of eruption.
02 May 2020 @ 2056 JoeN https://youtu.be/9bkNZP7Op8w 3 burst Grand
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.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool