Last Known Eruption
12h 1m ago

Latest Eruptions

Eruption DurationCodeInterval
25 Jun 2024 @ 16369m 55s T1Q8h 56m
25 Jun 2024 @ 074010m 39s G1Q10h 38m
24 Jun 2024 @ 210210m 20s T1Q6h 24m
24 Jun 2024 @ 14389m 25s D5D2/G1C9h 3m
24 Jun 2024 @ 0535 ie--Q8h 20m
23 Jun 2024 @ 211511m T1Q7h 37m
23 Jun 2024 @ 1337:0510m 2s T1Q10h 7m
23 Jun 2024 @ 0330 A---6h 53m
22 Jun 2024 @ 203710m 25s G1Q8h 30m
22 Jun 2024 @ 120712m 12s T2Q6h 52m
22 Jun 2024 @ 0515 A---7h 30m
21 Jun 2024 @ 2145 A---6h 9m
21 Jun 2024 @ 1535:1813m 6s D3/T1Q8h 6m
21 Jun 2024 @ 07299m 32s T1C9h 2m
20 Jun 2024 @ 2227T1Q7h 38m
20 Jun 2024 @ 144911m 19s T1Q8h 53m
20 Jun 2024 @ 0556 wc---8h 26m
19 Jun 2024 @ 2130 wc-2-9h 15m
19 Jun 2024 @ 121510m 40s G1Q7h 22m
19 Jun 2024 @ 0453 wc-2-8h 2m
18 Jun 2024 @ 205111m 22s D5/G1Q8h 2m
18 Jun 2024 @ 124910m 5s T2Q10h 34m
18 Jun 2024 @ 0215 A---7h 57m
17 Jun 2024 @ 181810m 32s G1C7h 10m
17 Jun 2024 @ 110810m G1C6h 38m
17 Jun 2024 @ 0430 A---10h 36m
16 Jun 2024 @ 175411m 43s G1Q7h 5m
16 Jun 2024 @ 104910m 41s G2Q6h 49m
16 Jun 2024 @ 0400 A---8h 25m
15 Jun 2024 @ 19359m 55s D0/G1C7h 17m
15 Jun 2024 @ 12189m 50s T1C8h 12m
15 Jun 2024 @ 0406 wc---9h 1m
14 Jun 2024 @ 1905~11m G2Q6h 58m
14 Jun 2024 @ 120710m 53s G1Q7h 37m
14 Jun 2024 @ 0430 wc-2-6h 33m
13 Jun 2024 @ 215710m G1C7h 55m
13 Jun 2024 @ 140212m D11/T1Q9h 53m
13 Jun 2024 @ 0409 wc-1-8h 22m
12 Jun 2024 @ 194711m 24s G1Q7h 39m
12 Jun 2024 @ 12089m 42s D2/G2C6h 47m
12 Jun 2024 @ 0521~11m -2Q6h 29m
11 Jun 2024 @ 225211m 8s G1Q8h 51m
11 Jun 2024 @ 140110m 30s D10/T1Q9h 50m
11 Jun 2024 @ 0411 wc-2-7h 31m
10 Jun 2024 @ 204010m 26s G1C6h 41m
10 Jun 2024 @ 135910m 9s D5/T1C7h 38m
10 Jun 2024 @ 062110m 11s T1C6h 45m
09 Jun 2024 @ 23369m 49s T1C7h 17m
09 Jun 2024 @ 161910m 17s G1C7h 19m
09 Jun 2024 @ 0900T2Q7h 30m
09 Jun 2024 @ 0130 A---7h 42m
08 Jun 2024 @ 174811m 15s G1Q6h 37m
08 Jun 2024 @ 11119m 55s G2C6h 51m
08 Jun 2024 @ 0420 wc-1-6h 19m
07 Jun 2024 @ 22019m 58s D3/G1C7h 52m
07 Jun 2024 @ 140910m 46s T1C11h 9m
07 Jun 2024 @ 0300 A---6h 59m
06 Jun 2024 @ 200110m 42s G1Q7h 6m
06 Jun 2024 @ 125511m 7s T1Q8h 35m
06 Jun 2024 @ 0420 wc-1-7h 25m
05 Jun 2024 @ 205511m 27s D0/G1Q9h 20m
05 Jun 2024 @ 11359m 34s D5/T1C14h 51m
04 Jun 2024 @ 204410:01D7/T2C8h 2m
04 Jun 2024 @ 124211m 13s G2Q7h 4m
04 Jun 2024 @ 05389m 58s T1C8h 37m
03 Jun 2024 @ 210111m 45s G1Q6h 44m
03 Jun 2024 @ 141711m 40s D4/G1Q7h 27m
03 Jun 2024 @ 065010m 50s T2Q7h 14m
02 Jun 2024 @ 233612m 1s G1Q7h 44m
02 Jun 2024 @ 155211m 13s G2Q7h 38m
02 Jun 2024 @ 08149m 28s T2C10h 47m
01 Jun 2024 @ 2127~11m -1Q6h 30m
01 Jun 2024 @ 145710m 10s T1C6h 32m
01 Jun 2024 @ 082510m 53s G2Q12h 51m
31 May 2024 @ 193410m 21s G2Q7h 31m
31 May 2024 @ 120311m 33s G2*Q7h 50m
31 May 2024 @ 0413 wc-1-6h 8m
30 May 2024 @ 220510m 58s D6/G2Q8h 29m
30 May 2024 @ 133610m 57s T1Q9h 56m
30 May 2024 @ 0340 wc---6h 24m
29 May 2024 @ 2116-1-7h 46m
29 May 2024 @ 1330T1Q9h 0m
29 May 2024 @ 0430 wc-1-6h 40m
28 May 2024 @ 2150 wc---7h 54m
28 May 2024 @ 135611m T1Q7h 54m
28 May 2024 @ 0602 ns wc-2-13h 35m
27 May 2024 @ 1626:419m 29s D8/G2C8h 53m 49s
27 May 2024 @ 0732:5210m 7s G2C15h 30m
26 May 2024 @ 160212m G3Q6h 53m
26 May 2024 @ 090912m T21Q14h 42m
25 May 2024 @ 1827 ns wc-1-11h 44m
25 May 2024 @ 064310m 50s G2Q6h 26m
25 May 2024 @ 0017 wc-1-6h 7m
24 May 2024 @ 18109m 42s T1C6h 31m
24 May 2024 @ 113910m 33s T1Q6h 46m
24 May 2024 @ 0453 ns wc-1-6h 24m
23 May 2024 @ 2229 wc---7h 30m
23 May 2024 @ 145910m 15s T1C7h 57m
23 May 2024 @ 0702 wc~12m 3s -1-12h 59m
22 May 2024 @ 1803 wc-1-7h 54m

Interval Statistics

Interval Count100
Min6h 7m
Max15h 30m
Mean8h 13m
Median7h 40m
Grand-Specific
Start36G/32T (52.94% G)
Max Bursts3
Mean Bursts1.33
Median Bursts1
End46Q/25C (64.79% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
35469 23 Jun 2024 @ 0603 --- JimS Pool nearly empty. Turban and Vent quiet.
35437 22 Jun 2024 @ 0607 --- JimS Pool empty, Vent and Turban ie.
35317 18 Jun 2024 @ 1919 --- Forestbewithyou 2 big boops/false starts
35270 17 Jun 2024 @ 0633 --- JimS First water into the pool
35269 17 Jun 2024 @ 0608 --- JimS Post eruptive. Vent and Turban quiet. Pool appears totally empty.
35241 16 Jun 2024 @ 0621 --- JimS Post eruptive, Vent quiet, Turban i.e., some water in the pool.
35231 15 Jun 2024 @ 0746 --- JimS First overflow from pool
35229 15 Jun 2024 @ 0616 --- JimS Post eruptive. Turban and Vent quiet.
35022 09 Jun 2024 @ 0500 --- K.Cooper a bit below half full, Mike said empty at 0300
34955 07 Jun 2024 @ 0708 --- JimS First overflow from pool
34952 07 Jun 2024 @ 0559 --- JimS Post eruptive. Already some water in the pool
34917 06 Jun 2024 @ 0617 --- JimS First water into pool at this time.
34665 25 May 2024 @ 0645 --- RLJones in eruption
34641 23 May 2024 @ 0022 --- JarnoO Either eruptive or post-eruptive at this time. In any case copious steaming until about 0100.
34185 14 Apr 2024 @ 1058 --- mhreed Water dropped back into crater mouth w/ Turban start. Has been periodically boiling.
33890 20 Jan 2024 @ 0711 --- K.Cooper empty
33879 19 Jan 2024 @ 0816 --- K.Cooper water is there, but low
33867 18 Jan 2024 @ 0745 --- K.Cooper pool decently high and overflowing
33796 15 Jan 2024 @ 0815 --- K.Cooper a few inches below overflow
33737 03 Jan 2024 @ 1105 --- mhvogel Grand erupted early this morning not too long before the post with question mark attached.
33371 22 Dec 2023 @ 1435 --- Pholli pool completely empty
33368 22 Dec 2023 @ 1005 --- aferrara pool low, no eruption since last night's as of this time. Economic in heavy overflow
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
EntrySourceLinkComment
20 Apr 2024 @ 2224 Joe   https://youtu.be/vIlPujViDqI 4 burst Grand
10 Jul 1995 @ 1319 mhreed https://www.youtube.com/watch?v=R7Ie05P2Sgc David Schwarz video of this eruption.
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.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool