Grand Geyser

Last Known Eruption
17h 21m ago

Latest Eruptions

Eruption DurationCodeInterval
27 Nov 2023 @ 1932 wc~11m -1-22h 3m
26 Nov 2023 @ 2129 wc---6h 37m
26 Nov 2023 @ 1452 wc~10m 29s -2*-6h 30m
26 Nov 2023 @ 0822 wc-1-8h 0m
26 Nov 2023 @ 0022 wc~11m -1-8h 19m
25 Nov 2023 @ 1603 wc~10m G1C20h 4m
24 Nov 2023 @ 1959 wc-1-6h 36m
24 Nov 2023 @ 1323 wc-1-14h 38m
23 Nov 2023 @ 2245 wc~11m -1-5h 58m
23 Nov 2023 @ 1647 wc~10m -2-7h 54m
23 Nov 2023 @ 0853 ie wc---13h 8m
22 Nov 2023 @ 1945 wc-1-20h 42m
21 Nov 2023 @ 2303 wc-1-6h 30m
21 Nov 2023 @ 1633 wc---22h 1m
20 Nov 2023 @ 1832 wc-1-7h 28m
20 Nov 2023 @ 1104 ie wc---23h 39m
19 Nov 2023 @ 1125 ie wc---16h 39m
18 Nov 2023 @ 1846 wc-1-6h 34m
18 Nov 2023 @ 1212 wc~11m 37s -1-20h 46m
17 Nov 2023 @ 1526 ie wc-1-8h 45m
17 Nov 2023 @ 0641 wc-2-13h 4m
16 Nov 2023 @ 1737 wc~11m -1-6h 51m
16 Nov 2023 @ 1046 wc-2Q21h 8m
15 Nov 2023 @ 1338 ie wc---6h 8m
15 Nov 2023 @ 0730 A wc---16h 4m
14 Nov 2023 @ 1526 wc---6h 11m
14 Nov 2023 @ 0915 wc---19h 47m
13 Nov 2023 @ 1328 wc~10m 35s -1Q6h 18m
13 Nov 2023 @ 0710 ie wc---13h 41m
12 Nov 2023 @ 1729 wc-1-8h 3m
12 Nov 2023 @ 0926 wc-2-6h 48m
12 Nov 2023 @ 0238 ? wc---13h 59m
11 Nov 2023 @ 1239 ie wc---19h 36m
10 Nov 2023 @ 1703 wc~9m 35s -1C8h 3m
10 Nov 2023 @ 0900 ie wc---18h 30m
09 Nov 2023 @ 1430 wc~11m 20s -1Q7h 28m
09 Nov 2023 @ 0702 ns wc---20h 13m
08 Nov 2023 @ 1049 wc~11m -1-20h 29m
07 Nov 2023 @ 1420---6h 49m
07 Nov 2023 @ 0731 ie wc---20h 53m
06 Nov 2023 @ 1038 wc~11m 10s -1C18h 37m
05 Nov 2023 @ 1601 wc---7h 7m
05 Nov 2023 @ 0854 wc-1-18h 49m
04 Nov 2023 @ 1505 wc-1-6h 41m
04 Nov 2023 @ 0824 wc---6h 28m
04 Nov 2023 @ 0156 wc-2-8h 52m
03 Nov 2023 @ 1704 ie wc-2-6h 41m
03 Nov 2023 @ 1023 wc~12m 5s -1Q6h 15m
03 Nov 2023 @ 0408 wc---12h 35m
02 Nov 2023 @ 1533 wc~11m -1-13h 29m
02 Nov 2023 @ 0204 wc~11m -1-12h 39m
01 Nov 2023 @ 1325 wc-1-6h 40m
01 Nov 2023 @ 0645 wc---6h 26m
01 Nov 2023 @ 0019 ie wc---7h 40m
31 Oct 2023 @ 1639 wc---7h 4m
31 Oct 2023 @ 0935---6h 33m
31 Oct 2023 @ 0302 wc-1-7h 15m
30 Oct 2023 @ 1947 wc-2-6h 44m
30 Oct 2023 @ 1303 wc~10m -1C6h 31m
30 Oct 2023 @ 0632 wc~12m -1-7h 53m
29 Oct 2023 @ 2239 wc-1-6h 51m
29 Oct 2023 @ 1548~10m G1C7h 12m
29 Oct 2023 @ 0836 ie wc---6h 54m
29 Oct 2023 @ 0142 wc-1-7h 6m
28 Oct 2023 @ 1836 wc-1-6h 3m
28 Oct 2023 @ 1233 wc-2-6h 39m
28 Oct 2023 @ 0554 wc~11m -1-13h 10m
27 Oct 2023 @ 1644 wc~9m 30s -1C6h 53m
27 Oct 2023 @ 095111m T1Q7h 53m
27 Oct 2023 @ 0158 wc-2-6h 33m
26 Oct 2023 @ 1925 wc-1-19h 9m
26 Oct 2023 @ 0016 wc-2-6h 8m
25 Oct 2023 @ 1808 ie wc---6h 48m
25 Oct 2023 @ 1120 ie wc---14h 30m
24 Oct 2023 @ 205010:36G1Q6h 43m
24 Oct 2023 @ 1407---6h 16m
24 Oct 2023 @ 0751 ie wc---20h 18m
23 Oct 2023 @ 1133 wc---13h 15m
22 Oct 2023 @ 2218 wc---7h 29m
22 Oct 2023 @ 1449-2Q6h 48m
22 Oct 2023 @ 0801 ? ie wc---14h 9m
21 Oct 2023 @ 1751:1010m 16s D3/G1Q7h 4m 24s
21 Oct 2023 @ 1046:4612m 5s G1Q18h 54m
20 Oct 2023 @ 1552<8.5m G1C7h 40m
20 Oct 2023 @ 0812~10m T1Q16h 26m
19 Oct 2023 @ 1546 ns wc---6h 15m
19 Oct 2023 @ 0931~9m T2C15h 22m
18 Oct 2023 @ 180911m T1Q8h 32m
18 Oct 2023 @ 0937 wc-2-19h 46m
17 Oct 2023 @ 13518m 19s T1C6h 29m
17 Oct 2023 @ 0722 ns wc-2-13h 18m
16 Oct 2023 @ 180410m 50s G1Q6h 26m
16 Oct 2023 @ 113811m 41s G1Q7h 8m
16 Oct 2023 @ 0430 A---7h 4m
15 Oct 2023 @ 212611m 7s T1Q7h 43m
15 Oct 2023 @ 1343T1C6h 23m
15 Oct 2023 @ 0720 ie wc---14h 48m
14 Oct 2023 @ 16328:50G1C6h 53m
14 Oct 2023 @ 093912m 5s G1Q13h 22m
13 Oct 2023 @ 20179m 54s G1C7h 36m

Interval Statistics

Interval Count100
Min5h 58m
Max23h 39m
Mean10h 52m
Median7h 40m
Grand-Specific
Start11G/8T (57.89% G)
Max Bursts2
Mean Bursts1.22
Median Bursts1
End15Q/13C (53.57% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
28939 21 Oct 2023 @ 0731 --- User34 Nearing first overflow
28601 01 Oct 2023 @ 0709 --- NihonRanger Pool is nice and full, doing a good amount of overflow. Small ripple waves, nothing big yet.
28509 27 Sep 2023 @ 1103 --- Brian Rift off
28138 09 Sep 2023 @ 0905 --- SteveO Reached overflow.
28128 09 Sep 2023 @ 0636 --- K.Cooper Pool empty
28075 07 Sep 2023 @ 0627 --- SteveO Not in overflow yet.
28026 05 Sep 2023 @ 0757 --- JimS First overflow from pool
27800 27 Aug 2023 @ 0644 --- JimS Pool still below overflow
27770 25 Aug 2023 @ 0652 --- JimS Slight amount of water in pool. Vent and Turban quiet
27696 20 Aug 2023 @ 0622 --- JimS Already in overflow
27679 19 Aug 2023 @ 0610 --- JimS Already in overflow
27651 17 Aug 2023 @ 0627 --- JimS Already in overflow
27514 11 Aug 2023 @ 0603 --- JimS Pool empty, Turban ie, Vent quiet
27501 10 Aug 2023 @ 1622 --- minissa Some interesting afterbhrst activity started around 1610. Vigorous Vent and Turban, Grand erupting from empty pool intermittently to as high as 12 feet. Eruption was recorded as a Q, so this caught our attention. Noticed from over by Spasmodic.
27485 10 Aug 2023 @ 0619 --- JimS Already in overflow
27469 09 Aug 2023 @ 0609 --- JimS Pool below overflow
27450 07 Aug 2023 @ 0626 --- JimS Pool empty, Turban and Vent quiet
27395 03 Aug 2023 @ 0610 --- JimS Pool empty, Turban and Vent quiet
27343 30 Jul 2023 @ 1828 --- RVD Grand intermittently "erupting" from an empty pool, with some spritzy bursts matching the height of Vent Geyser which continues to go strong. Turban continues to also have strong eruptions and the Triplet has joined in. I have not seen this before. This is roughly half an hour after the main eruption (which i did not see). Stayed at Grand for almost 10 minutes to watch.
27273 28 Jul 2023 @ 0533 --- JimS Pool empty, Turban and Vent ie
27249 27 Jul 2023 @ 0611 --- JimS Already in overflow
27208 25 Jul 2023 @ 0609 --- JimS Already in overflow
27189 24 Jul 2023 @ 0608 --- JimS Already in overflow
27137 21 Jul 2023 @ 0617 --- JimS Already in overflow
27129 20 Jul 2023 @ 0602 --- JimS Pool empty, Turban and Vent quiet
27080 16 Jul 2023 @ 0553 --- JimS Pool empty, Turban and Vent quiet
27060 14 Jul 2023 @ 0508 --- dandersen Pool Empty
27043 13 Jul 2023 @ 0540 --- JimS Pool empty, Turban and Vent quiet
26999 11 Jul 2023 @ 0525 --- JimS Pool empty, Turban and Vent quiet.
26875 07 Jul 2023 @ 0544 --- JimS Already in overflow
26859 06 Jul 2023 @ 0533 --- JimS Already in overflow
26813 04 Jul 2023 @ 0549 --- JimS Already in overflow
26689 27 Jun 2023 @ 0536 --- JimS Pool empty, Turban and Vent quiet
26655 25 Jun 2023 @ 0543 --- JimS Already in overflow
26630 24 Jun 2023 @ 0539 --- JimS Already in overflow
26581 22 Jun 2023 @ 0533 --- JimS Already in overflow
26554 21 Jun 2023 @ 0537 --- JimS Already in overflow
26484 20 Jun 2023 @ 0538 --- JimS Already in overflow
26452 19 Jun 2023 @ 0540 --- JimS Already in overflow
26433 18 Jun 2023 @ 0549 --- JimS Pool empty, Vent quiet, Turban came on at 0552
26352 16 Jun 2023 @ 0632 --- JimS First overflow from pool, implying last eruption was about 0230.
26327 15 Jun 2023 @ 0547 --- JimS Water visible in the pool. Turban and Vent quiet.
26261 12 Jun 2023 @ 0730 --- JimS First overflow from the pool, implying eruption about 0330.
26256 12 Jun 2023 @ 0610 --- JimS Water visible in the pool
26205 10 Jun 2023 @ 0602 --- JimS Pool nearly empty, Turban and Vent quiet
26178 09 Jun 2023 @ 0606 --- JimS Pool is in overflow.
26147 08 Jun 2023 @ 0658 --- JimS Start of overflow from pool. Implies last eruption was about 0300.
25998 04 Jun 2023 @ 0628 --- JimS First water visible in pool meaning it's last eruption was probably about 0430.
25994 04 Jun 2023 @ 0530 --- K.Cooper empty
25968 02 Jun 2023 @ 1729 --- TSBryan Grand splashed, rested, splashed again with moderate waves, then dropped. Turban at 24 minutes.
25957 02 Jun 2023 @ 0639 --- JimS 1st visible water came into the pool. usually comes about 2 hours after eruption
25878 29 May 2023 @ 0550 --- JimS Pool empty.
25810 27 May 2023 @ 0600 --- JimS Just a small amount of water in the pool. Turban and Vent quiet.
25448 15 May 2023 @ 0846 --- RLJones Post eruptive at 0842 with Vent and Tuban continuing. They stopped at 0845.
25452 14 May 2023 @ 1735 --- SantaFe108 Huge afterplay, bursting up to 40 feet out of an empty pool.
24971 02 Feb 2023 @ 1340 --- mhvogel Electronic time is from Bluetooth logger located in grand runoff channel. The electronic time has nothing to do with telemetered loggers. I thought Bluetooth was toast as the the last time I tried to connect to the logger, it failed.
24865 11 Jan 2023 @ 0734 --- Graham Turban and Vent ie.
24609 01 Nov 2022 @ 1020 --- mhreed Water several centimeters below overflow; no first overflow yet.
24118 26 Sep 2022 @ 1415 26 Sep 2022 @ 1422 Brian Walked up to Geyser approximately 1410, noted period of sustained heavy overflow starting at 1415 and ending shortly before turban at 1423. no knowledge of when prior Turban was, but this behaved like a delay interval.
23535 02 Sep 2022 @ 0635 --- Suzanne Pool empty.
23455 28 Aug 2022 @ 0624 --- JimS Pool empty. Turban and Vent quiet.
23407 26 Aug 2022 @ 0619 --- JimS Pool empty. Turban and Vent quiet
23379 24 Aug 2022 @ 0617 --- JimS Pool empty. Turban and Vent Quiet.
23170 14 Aug 2022 @ 0605 --- JimS Pool empty. Turban and Vent ie.
23001 03 Aug 2022 @ 0606 --- JimS Pool empty. Turban and Vent Quiet.
22925 29 Jul 2022 @ 0545 --- JimS No eruption yet
22903 28 Jul 2022 @ 0604 --- JimS Could see some water in the pool. Maybe not the first water.
22902 28 Jul 2022 @ 0545 --- JimS Pool empty, Turban and Vent quiet.
22869 26 Jul 2022 @ 0543 --- JimS Pool in overflow
22834 25 Jul 2022 @ 0602 --- JimS First overflow from pool.
22801 23 Jul 2022 @ 0634 --- JimS First water visible in the pool.
22799 23 Jul 2022 @ 0542 --- JimS Pool empty. Turban and Vent quiet.
22770 22 Jul 2022 @ 0548 --- JimS Pool empty, no water visible, Turban and Vent quiet.
22693 19 Jul 2022 @ 1221 --- JimS 1st overflow
22687 19 Jul 2022 @ 0536 --- JimS Appears to be start of overflow.
22709 19 Jul 2022 @ 0431 --- jluesse No eruption yet. Out of NPS prediction. Still shows some promise.
22429 09 Jul 2022 @ 1308 --- hkoenig First ovfl
22346 06 Jul 2022 @ 0531 --- JimS Pool empty
22294 03 Jul 2022 @ 0541 --- JimS Pool empty
22108 25 Jun 2022 @ 0750 --- K.Cooper overflow just starting
22106 25 Jun 2022 @ 0547 --- JimS Pool empty
21597 31 May 2022 @ 1202 --- Stephen_Gemar The Emperor called “Waves on Grand,” but it did not erupt, which resulted in a Turban Delay.
20896 22 Mar 2022 @ 1641 --- JarnoO (wc) Appears to be post-eruptive based on constant steam from Vent and Turban area when cam panned downbasin after Old Faithful. Interval likely over 9 hours.
20828 18 Feb 2022 @ 0900 18 Feb 2022 @ 0905 aferrara Water level about 5 inches below full. Logger shows no eruption since 0032 this morning. Rapidly filling as of 0905.
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.
EntrySourceLinkComment
07 Jan 2023 @ 1613 Delta4Heavy85 https://adobe.ly/3GsvpVV Grand's eruption from the webcams view.
04 Jan 2023 @ 1237 Delta4Heavy85 https://adobe.ly/3jZ7UfI Video of eruption from the Webcam's view
25 Nov 2022 @ 2318 Art-P https://www.youtube.com/watch?v=Q0hVAQ7RK54 GRAND video
17 May 2021 @ 0059 JoeN https://i.imgur.com/ZgC53Oh.png Grand 0059
04 Aug 2020 @ 1933 JSJ https://www.youtube.com/watch?v=wOTjWdGdOEY 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.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool
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