Last Known Eruption
2h 47m ago
Predicted Next Eruption
Oct 19 at 0316 ± 60 minutes

Latest Eruptions

EruptionDurationCodeInterval
18 Oct 2017 @ 2040 wc-1-6h 19m
18 Oct 2017 @ 1421G1C6h 33m
18 Oct 2017 @ 0748 wc-1-5h 34m
18 Oct 2017 @ 0214 wc-1-6h 13m
17 Oct 2017 @ 2001 wc---5h 52m
17 Oct 2017 @ 1409G2C6h 16m
17 Oct 2017 @ 0753 wc---5h 59m
17 Oct 2017 @ 0154 wc---5h 57m
16 Oct 2017 @ 1957 wc---6h 4m
16 Oct 2017 @ 1353-1C6h 22m
16 Oct 2017 @ 0731 ns wc---6h 50m
16 Oct 2017 @ 0041 wc---6h 46m
15 Oct 2017 @ 1755 wc-2-6h 2m
15 Oct 2017 @ 115310T1C7h 12m
15 Oct 2017 @ 0441 wc-1-6h 33m
14 Oct 2017 @ 2208 wc---6h 48m
14 Oct 2017 @ 1520 wc-1-6h 33m
14 Oct 2017 @ 0847 wc---12h 35m
13 Oct 2017 @ 2012 wc---6h 18m
13 Oct 2017 @ 135411m -2C6h 19m
13 Oct 2017 @ 0735 wc-1-6h 20m
13 Oct 2017 @ 0115 wc~10m ---6h 35m
12 Oct 2017 @ 18409m G--6h 9m
12 Oct 2017 @ 1231 wc---6h 28m
12 Oct 2017 @ 0603 wc---6h 22m
11 Oct 2017 @ 2341 wc---7h 15m
11 Oct 2017 @ 1626 ns wc---6h 10m
11 Oct 2017 @ 1016-1C6h 56m
11 Oct 2017 @ 0320 wc---5h 43m
10 Oct 2017 @ 2137 wc---6h 59m
10 Oct 2017 @ 1438 wc-2-5h 55m
10 Oct 2017 @ 0843 wc---6h 12m
10 Oct 2017 @ 0231 wc---6h 42m
09 Oct 2017 @ 1949 wc---6h 20m
09 Oct 2017 @ 1329 wc±11m16s-1-6h 16m
09 Oct 2017 @ 0713 wc---6h 50m
09 Oct 2017 @ 0023 wc-1-5h 46m
08 Oct 2017 @ 1837 wc---7h 5m
08 Oct 2017 @ 1132 wc-1-5h 56m
08 Oct 2017 @ 0536 wc---5h 49m
07 Oct 2017 @ 2347 wc-1-5h 35m
07 Oct 2017 @ 1812 wc-2-6h 18m
07 Oct 2017 @ 1154G1C7h 41m
07 Oct 2017 @ 0413 wc-2-6h 18m
06 Oct 2017 @ 2155 wc---5h 57m
06 Oct 2017 @ 155810m 38s G1C6h 3m
06 Oct 2017 @ 0955~10m G1C5h 57m
06 Oct 2017 @ 0358 wc---6h 17m
05 Oct 2017 @ 2141 wc---6h 9m
05 Oct 2017 @ 1532G1Q6h 31m
05 Oct 2017 @ 0901~9m G1C6h 13m
05 Oct 2017 @ 0248 wc---6h 25m
04 Oct 2017 @ 2023 wc---6h 34m
04 Oct 2017 @ 1349G1C6h 6m
04 Oct 2017 @ 0743 E---6h 24m
04 Oct 2017 @ 0119 E---6h 26m
03 Oct 2017 @ 1853?D3/T2Q6h 44m
03 Oct 2017 @ 1209G--6h 11m
03 Oct 2017 @ 0558 wc---6h 10m
02 Oct 2017 @ 2348 wc-1-6h 0m
02 Oct 2017 @ 174810m 31s G1C6h 19m
02 Oct 2017 @ 1129G1C5h 35m
02 Oct 2017 @ 0554 wc---5h 43m
02 Oct 2017 @ 0011 wc---5h 41m
01 Oct 2017 @ 1830 wc---6h 3m
01 Oct 2017 @ 1227G1Q5h 51m
01 Oct 2017 @ 0636 wc---6h 4m
01 Oct 2017 @ 0032 wc---6h 11m
30 Sep 2017 @ 1821---6h 21m
30 Sep 2017 @ 120011m 3s G1Q5h 56m
30 Sep 2017 @ 0604 E---6h 21m
29 Sep 2017 @ 2343 wc---6h 11m
29 Sep 2017 @ 1732G1C5h 52m
29 Sep 2017 @ 11409m 40s G1Q5h 50m
29 Sep 2017 @ 0550 wc---6h 36m
28 Sep 2017 @ 2314---6h 30m
28 Sep 2017 @ 1644~12m T1Q5h 56m
28 Sep 2017 @ 1048 wc---6h 12m
28 Sep 2017 @ 0436 wc---5h 47m
27 Sep 2017 @ 2249 wc-2-6h 32m
27 Sep 2017 @ 161711m 30s G2Q6h 9m
27 Sep 2017 @ 100810m 2s G2Q6h 25m
27 Sep 2017 @ 0343 wc---6h 11m
26 Sep 2017 @ 2132 wc-2-6h 24m
26 Sep 2017 @ 150810m 13s G1C6h 18m
26 Sep 2017 @ 085013m 15s D2/T1Q6h 28m
26 Sep 2017 @ 0222 wc---6h 5m
25 Sep 2017 @ 2017 wc---5h 47m
25 Sep 2017 @ 143010m 16s G2Q6h 16m
25 Sep 2017 @ 081411m 50s G2*Q6h 30m
25 Sep 2017 @ 0144 wc---7h 36m
24 Sep 2017 @ 1808-1C5h 43m
24 Sep 2017 @ 122510m 10s D0/G1C5h 59m
24 Sep 2017 @ 0626 wc-2-5h 53m
24 Sep 2017 @ 0033 wc---6h 18m
23 Sep 2017 @ 181510m 50s G2*C5h 33m
23 Sep 2017 @ 124211m 29s T2*Q6h 4m
23 Sep 2017 @ 0638 wc---6h 28m
23 Sep 2017 @ 0010 wc---6h 19m
22 Sep 2017 @ 1751---5h 50m

Interval Statistics

Interval Count100
Min5h 33m
Max12h 35m
Mean6h 19m
Median6h 16m
Grand-Specific
Start23G/5T (82.14% G)
Max Bursts2
Mean Bursts1.35
Median Bursts1
End19C/12Q (61.29% C)

Latest Notes

Note IDStart TimeEnd TimeEntrantNote
7715 16 Oct 2017 @ 0003 --- Joethermop looked like Grand at 0003, lasted about 10 minutes, condition very dark, hard to be sure. Right place slightly early.
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 --- AndrewW 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.
4429 09 Jul 2017 @ 0757 --- Barbara Lasseter first burst ended at 0806. 2nd burst at 0807 lasted under one minute. G2 C
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.
4079 10 May 2017 @ 0601 --- JimS Pool empty. Vent and Turban quiet at 0601.
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.
3965 09 Apr 2017 @ 0726 --- vw Possible Grand eruption, ie. Too foggy to be sure. A video review may clarify.
3957 27 Feb 2017 @ 0740 --- vw Large steam plume. Timing for Grand eruption consistent. Unable to to see water due to steam/fog. Video review may confirm eruption.
3955 20 Feb 2017 @ 0831 --- WillBoekel has not reached overflow yet
3954 19 Feb 2017 @ 1030 --- WillBoekel entered overflow in the last hour
3947 15 Feb 2017 @ 0758 --- vw Very large steam plume in Grand area. Unable to verify as Grand due to ground fog, but size and duration suggest Grand eruption.
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.
3861 06 Nov 2016 @ 0625 --- Graham Big steam cloud from Grand or Oblong. Not sure which.
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.
3588 01 Sep 2016 @ 0435 --- DGInc Might've erupted
3585 31 Aug 2016 @ 2203 --- DGInc Might've erupted. 2204 is also possible.
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.
3404 02 Aug 2016 @ 0452 --- DGInc Might've been in eruption.
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.
3289 11 Jul 2016 @ 0043 --- DGInc MAY have erupted. Oblong is also a possibility. Due to the blurriness of the webcam it isn't visible as good as I would've liked, but it looked like 9 to 10 minutes. Maybe an E-time wouldn't be that bad to have though...
3287 11 Jul 2016 @ 0010 --- AndrewW 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.
3222 06 Jul 2016 @ 0111 --- DGInc Might have erupted at that time. Due to the blurriness it is almost unseeable. Duration was about 10 to 11 minutes.
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.
3132 25 Jun 2016 @ 0521 --- JimS Pool below 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.
EntrySourceLinkComment
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
10 Jun 2014 @ 1327 Micah Kipple https://www.flickr.com/photos/107465174@N04/15887463047 flickr
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool


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