Grand Geyser

Last Known Eruption
12h 27m ago

Latest Eruptions

Eruption DurationCodeInterval
24 Mar 2023 @ 0050 wc---6h 53m
23 Mar 2023 @ 1757 wc~9m 52s -1-6h 21m
23 Mar 2023 @ 1136 wc9m 16s -2-6h 34m
23 Mar 2023 @ 0502 wc-2-14h 47m
22 Mar 2023 @ 1415 wc~11m 16s -1-19h 40m
21 Mar 2023 @ 1835 ie wc-1-6h 24m
21 Mar 2023 @ 1211 wc~9m 37s -1-6h 40m
21 Mar 2023 @ 0531 wc---14h 6m
20 Mar 2023 @ 1525 wc~11m 4s -2*-6h 33m
20 Mar 2023 @ 0852 ie wc-1-13h 46m
19 Mar 2023 @ 1906 wc---6h 51m
19 Mar 2023 @ 1215 ie wc---13h 27m
18 Mar 2023 @ 2248 wc---6h 51m
18 Mar 2023 @ 1557 ie wc---6h 18m
18 Mar 2023 @ 0939 wc---6h 27m
18 Mar 2023 @ 0312 wc---7h 17m
17 Mar 2023 @ 1955 wc-1-7h 24m
17 Mar 2023 @ 1231 ie wc-1-15h 51m
16 Mar 2023 @ 2040 wc---6h 29m
16 Mar 2023 @ 1411 ie wc-1-7h 10m
16 Mar 2023 @ 0701 wc-1-13h 37m
15 Mar 2023 @ 1724 ? ie wc---1d 3h 28m
14 Mar 2023 @ 1356 wc~11m 24s -1-6h 56m
14 Mar 2023 @ 0700 E---7h 9m
13 Mar 2023 @ 2351 wc-1-7h 10m
13 Mar 2023 @ 1641 wc---7h 32m
13 Mar 2023 @ 0909 E---6h 24m
13 Mar 2023 @ 0245 E---6h 29m
12 Mar 2023 @ 2016 wc---6h 48m
12 Mar 2023 @ 1328 wcT2Q6h 33m
12 Mar 2023 @ 0655 wc---6h 49m
11 Mar 2023 @ 2306 E---7h 51m
11 Mar 2023 @ 1515 wc10m 41s G1C7h 23m
11 Mar 2023 @ 0752 wc-1-6h 24m
11 Mar 2023 @ 0128 wc-1-6h 23m
10 Mar 2023 @ 1905 wc-1-6h 53m
10 Mar 2023 @ 1212 E---6h 46m
10 Mar 2023 @ 0526 E---8h 53m
09 Mar 2023 @ 2033 wc---6h 16m
09 Mar 2023 @ 1417 E---9h 52m
09 Mar 2023 @ 0425 E---6h 25m
08 Mar 2023 @ 2200 wc-1-19h 42m
08 Mar 2023 @ 0218 wc-1-6h 52m
07 Mar 2023 @ 1926 wc-1-6h 38m
07 Mar 2023 @ 1248 E---6h 58m
07 Mar 2023 @ 0550 wc-1-6h 59m
06 Mar 2023 @ 2251 wc-1-6h 31m
06 Mar 2023 @ 1620~10m G2Q7h 0m
06 Mar 2023 @ 0920 wc-1-7h 25m
06 Mar 2023 @ 0155 wc---6h 32m
05 Mar 2023 @ 1923 wc---6h 35m
05 Mar 2023 @ 1248 wc---6h 35m
05 Mar 2023 @ 0613 wc---6h 3m
05 Mar 2023 @ 0010 wc-1-6h 30m
04 Mar 2023 @ 174012:31D3/G1Q8h 30m
04 Mar 2023 @ 0910-1-6h 30m
04 Mar 2023 @ 0240 E---6h 50m
03 Mar 2023 @ 1950 wc-1-6h 43m
03 Mar 2023 @ 1307G1C7h 22m
03 Mar 2023 @ 0545 E---6h 43m
02 Mar 2023 @ 2302 wc-1-6h 41m
02 Mar 2023 @ 1621G2Q6h 43m
02 Mar 2023 @ 0938 ie---7h 23m
02 Mar 2023 @ 0215 wc-1-6h 21m
01 Mar 2023 @ 1954 wc---6h 12m
01 Mar 2023 @ 1342T2Q7h 16m
01 Mar 2023 @ 0626 E---6h 15m
01 Mar 2023 @ 0011 wc-1-7h 16m
28 Feb 2023 @ 1655 wc---6h 29m
28 Feb 2023 @ 1026 wc-2-6h 29m
28 Feb 2023 @ 0357 wc---6h 16m
27 Feb 2023 @ 2141 wc-1-6h 26m
27 Feb 2023 @ 1515 wc---7h 55m
27 Feb 2023 @ 0720 ie wc---8h 48m
26 Feb 2023 @ 2232 E---7h 6m
26 Feb 2023 @ 1526 wc---7h 7m
26 Feb 2023 @ 0819 E---6h 16m
26 Feb 2023 @ 0203 E---6h 28m
25 Feb 2023 @ 1935 wc-1-6h 27m
25 Feb 2023 @ 1308 wc~10m 25s -1-6h 42m
25 Feb 2023 @ 0626 wc~11m -2-7h 34m
24 Feb 2023 @ 2252 wc---6h 20m
24 Feb 2023 @ 1632 ie---7h 34m
24 Feb 2023 @ 0858 ns wc~11½m-1-7h 8m
24 Feb 2023 @ 0150 wc-1-6h 43m
23 Feb 2023 @ 1907 wc-1-6h 42m
23 Feb 2023 @ 1225 wcunknown duration, too much steam-2-6h 19m
23 Feb 2023 @ 0606 wc---8h 3m
22 Feb 2023 @ 2203 ? wc---6h 43m
22 Feb 2023 @ 1520 ns wc-1-6h 18m
22 Feb 2023 @ 0902 E---18h 35m
21 Feb 2023 @ 1427 E---6h 0m
21 Feb 2023 @ 0827 E---6h 8m
21 Feb 2023 @ 0219 E---6h 19m
20 Feb 2023 @ 2000 E---6h 20m
20 Feb 2023 @ 1340 ie---6h 47m
20 Feb 2023 @ 0653 ie wc---6h 0m
20 Feb 2023 @ 0053 E---6h 40m
19 Feb 2023 @ 1813 ns wc-1-7h 29m
19 Feb 2023 @ 1044 wc---6h 54m

Interval Statistics

Interval Count100
Min6h 0m
Max1d 3h 28m
Mean7h 52m
Median6h 44m
Grand-Specific
Start5G/2T (71.43% G)
Max Bursts2
Mean Bursts1.21
Median Bursts1
End5Q/2C (71.43% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
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
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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