Last Known Eruption
11d 14h 35m ago

Latest Eruptions

Eruption DurationInterval
07 Nov 2018 @ 161210d 13h 46m
28 Oct 2018 @ 0326 wc8d 12m
20 Oct 2018 @ 0314 wc8d 14h 58m
11 Oct 2018 @ 12161h 34m 18d 13h 21m
22 Sep 2018 @ 22551h 11m 5d 5h 47m
17 Sep 2018 @ 17081h 18m 9d 43m
08 Sep 2018 @ 16251h 23m 6d 23h 18m
01 Sep 2018 @ 17071h 15m 11d 3h 12m
21 Aug 2018 @ 13551h 17m 8d 13h 5m
13 Aug 2018 @ 00501h 11m 9d 2h 16m
03 Aug 2018 @ 22341h 10m 10d 8h 0m
24 Jul 2018 @ 14341h 9m 6d 14h 26m
18 Jul 2018 @ 0007:3112d 9h 54m
05 Jul 2018 @ 14131h 12m 14d 23h 59m
20 Jun 2018 @ 14141h 11m 11d 1h 1m
09 Jun 2018 @ 13131h 18m 16d 10h 50m
24 May 2018 @ 0223 wc19d 9h 3m
04 May 2018 @ 17201h 3m 9d 21h 31m
24 Apr 2018 @ 19491h 8m 40d 19h 49m
15 Mar 2018 @ 0000 ? A37d 23h 0m
05 Feb 2018 @ 0000 ? A93d 11h 58m
03 Nov 2017 @ 1302 wc24d 16h 51m
09 Oct 2017 @ 2011 wc1 to 1.5h94d 4h 41m
07 Jul 2017 @ 15301h 1m 1y 283d 10h 27m
28 Sep 2015 @ 0503 wc5y 250d 3h 7m
22 Jan 2010 @ 0056 E6d 4h 0m
15 Jan 2010 @ 2056 E340d 20h 56m
09 Feb 2009 @ 0000 A129d 6m
03 Oct 2008 @ 0054 E37d 17h 50m
26 Aug 2008 @ 07041h 10m 118d 16h 2m
29 Apr 2008 @ 15021h 27m 13d 4h 23m
16 Apr 2008 @ 1039 wc11d 11h 54m
04 Apr 2008 @ 2245 E7d 4h 54m
28 Mar 2008 @ 1751 wc5d 18h 41m
22 Mar 2008 @ 2310 E11d 4h 40m
11 Mar 2008 @ 1830 E7d 13h 15m
04 Mar 2008 @ 0415 E5d 12h 42m
27 Feb 2008 @ 1533 wc8d 6h 1m
19 Feb 2008 @ 09321h 38m 9d 11h 27m
09 Feb 2008 @ 2205 E5d 13h 5m
04 Feb 2008 @ 0900 wc8d 9h 0m
27 Jan 2008 @ 00005d 0m
22 Jan 2008 @ 0000 A8d 0m
14 Jan 2008 @ 0000 A14d 15h 17m
30 Dec 2007 @ 08431h 38m 8d 19h 28m
21 Dec 2007 @ 131510d 20h 30m
10 Dec 2007 @ 1645 ? ie wc15d 14h 54m
25 Nov 2007 @ 0151 wc6d 13h 52m
18 Nov 2007 @ 1159 ns wc6d 2h 25m
12 Nov 2007 @ 0934 ns wc5d 16h 30m
06 Nov 2007 @ 17045d 9h 39m
01 Nov 2007 @ 08251h 39m 5d 8h 38m
26 Oct 2007 @ 23471h 27m 4d 11h 32m
22 Oct 2007 @ 12155d 22h 50m
16 Oct 2007 @ 13251h 33m 6d 2h 51m
10 Oct 2007 @ 10345d 3h 49m
05 Oct 2007 @ 0645 ie wc6d 7h 0m
28 Sep 2007 @ 23455d 20h 45m
23 Sep 2007 @ 0300 ? ie7d 5h 23m
15 Sep 2007 @ 21377d 6h 5m
08 Sep 2007 @ 15321h 38m 9d 5h 15m
30 Aug 2007 @ 10171h 44m 5d 4h 49m
25 Aug 2007 @ 05281h 42m 7d 16h 37m
17 Aug 2007 @ 1251>1h 30m 7d 7h 3m
10 Aug 2007 @ 05481h 35m 6d 1h 8m
04 Aug 2007 @ 04401h 30m 6d 20h 53m
28 Jul 2007 @ 07474d 7h 41m
24 Jul 2007 @ 00065d 15h 58m
18 Jul 2007 @ 08085d 54m
13 Jul 2007 @ 07146d 11h 25m
06 Jul 2007 @ 19498d 7h 16m
28 Jun 2007 @ 12337d 22h 21m
20 Jun 2007 @ 14127d 11h 56m
13 Jun 2007 @ 02165d 22h 43m
07 Jun 2007 @ 03336d 17h 54m
31 May 2007 @ 09397d 4h 7m
24 May 2007 @ 05324d 17h 23m
19 May 2007 @ 12095d 0m
14 May 2007 @ 12094d 21h 58m
09 May 2007 @ 14117d 19h 0m
01 May 2007 @ 19117d 3h 28m
24 Apr 2007 @ 1543 wc11d 12h 11m
13 Apr 2007 @ 0332 E15d 1h 10m
29 Mar 2007 @ 0222 E6d 18h 12m
22 Mar 2007 @ 0810 ns8d 17h 39m
13 Mar 2007 @ 14319d 6m
04 Mar 2007 @ 1325 wc>1.5 h5d 8h 43m
27 Feb 2007 @ 0442 E4d 7h 45m
22 Feb 2007 @ 2057 E4d 18h 25m
18 Feb 2007 @ 0232 E5d 21h 22m
12 Feb 2007 @ 051010d 20h 59m
01 Feb 2007 @ 0811 ns wc8d 21h 32m
23 Jan 2007 @ 1039 wc6d 21h 1m
16 Jan 2007 @ 1338 wc5d 2h 53m
11 Jan 2007 @ 10458d 8h 30m
03 Jan 2007 @ 0215 E10d 6h 35m
23 Dec 2006 @ 1940 E10d 14h 40m
13 Dec 2006 @ 0500 E9d 21h 0m
03 Dec 2006 @ 0800 ie6d 14h 2m
26 Nov 2006 @ 17587d 1h 48m

Interval Statistics

Interval Count100
Min4d 7h 41m
Max5y 250d 3h 7m
Mean43d 17h 2m
Median7d 20h 40m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
10744 18 Nov 2018 @ 1655 --- TheHikingDude Lots of steam originating from the tree line where it is. It might try and erupt. We are in the timeframe for an eruption.
10717 04 Nov 2018 @ 0830 --- steve No overnight eruption
10708 03 Nov 2018 @ 1110 --- steve No eruption overnight
10703 02 Nov 2018 @ 1128 --- steve For the last 10 minutes Bijou has been off with no water in Mastiff and even the sw vents are quiet with no steam. Grotto is on, maybe a Grotto marathon.
10672 28 Oct 2018 @ 1633 --- steve The danger sign and the giant sign were rolled, one to just above India and the other to the right side of the cage.
10671 28 Oct 2018 @ 1129 --- steve Geology will be in the ugb to replace the signs on Wednesday
10561 05 Oct 2018 @ 0930 --- Tara No eruption overnight.
9978 01 Sep 2018 @ 1708 --- Graham Water seen over the ridge on the webcam at 1708. Big puff of steam earlier at 1707 could have been Mastiff.
9901 28 Aug 2018 @ 0545 --- SteveO No Giant yet.
9607 10 Aug 2018 @ 1904 10 Aug 2018 @ 1905 JSJ Seven minutes after end of hot period, Giant had sustained, wide, subvertical (very slightly angled to the left) surging above the cone for ~0.25 to 0.5 minutes.
9558 08 Aug 2018 @ 2114 --- Brian Unattended at 2115
8827 20 Jun 2018 @ 2349 --- Tom C. Tara's write up of the GHP is excellent and contains more info than I could have recalled. I'd just add that Catfish and B-C vent (which I've called "Crawdad" for years, without any support) were also active to varying degrees throughout the GHP, but never notable enough for me to include in my calls. But that's not the point of this note. I'd just like to say that the Grotto which preceded the GHP was still ie. right through the Giant start. It was 7 min. shy of 2 hrs. in duration at that point. It had 'tried' and failed to have a Rocket major for ~ 20 min. from about the 1 hr. to 80 min. mark. The previous Giant (6/9/18) was preceded by about a 2 hr. Grotto that also 'tried' and failed to have a Rocket major from about the 1 hr. mark until it just gave up and quit without a Rocket. So, 2 data points. Use them recklessly. Also, Grotto started again within 10 min. of Giant ending.
8878 19 Jun 2018 @ 1223 --- Polly Surge from A & B vents almost out of the cone. (Also vertical surges at 1236 - A & B 1' , 1238 - B vent 2' , 1248 B vent.)
8733 16 Jun 2018 @ 1820 --- Polly Unattended
8871 16 Jun 2018 @ 1224 16 Jun 2018 @ 1800 Polly Periodic vertical surges in Giant (1-3 feet, but mostly 1 foot).
8700 15 Jun 2018 @ 1854 --- Mkeller Two minute cycle of reverse jetting over 1/2 way up Giant's cone
8970 14 Jun 2018 @ 1342 14 Jun 2018 @ 1400 Polly Periodic vertical surging in Giant 1-2' high.
8580 08 Jun 2018 @ 2130 --- WillBoekel unattended
8513 06 Jun 2018 @ 1749 --- WillBoekel unattended
8172 13 May 2018 @ 0550 --- SteveO No Giant yet, I've gone to Norris.
8165 12 May 2018 @ 1215 12 May 2018 @ 1227 Polly Numerous good-sized splashes both vertical and right to left in Giant’s cone.
8257 11 May 2018 @ 0820 11 May 2018 @ 1800 Polly Energy has shifted overnight. Bijou is behaving normally with pauses. (No steam phase in Bijou observed.). Giant has more normal-looking surges. Mastiff is much calmer today, with occasional splashes, depth charging, and occasional bathtubs. Observations were at various time spans during the day.
7966 06 Apr 2018 @ 1330 --- Bijoumonkey Giant sign and "Stay On Walk" sign have rolled off the platform.
7940 07 Feb 2018 @ 0850 --- Dave from B Giant and Mastiff signs have moved/rolled. Possible eruption between Sat, Feb 3 1312 (Graham's last post) and 1600 Tuesday, Feb 6 (NPS OFVEC )
7897 30 Jan 2018 @ 0730 --- Graham Back to normal now, no depth charging.
7892 29 Jan 2018 @ 1456 --- Graham Some vertical splashes. Over several hours there were occasional vertical splashes the width of the cone, not reaching the bite. A few vertical spikes on the left side reached the bite.
7890 29 Jan 2018 @ 1350 --- Graham Giant doing some left to right splashes out of the cone and Mastiff is depth charging. More water than I saw yesterday.
7700 10 Oct 2017 @ 1823 --- WillBoekel Mastiff sign has moved and the giant sign is not under the boardwalk but certainly moved (it is approximately 15 feet from the boardwalk) and facing the wrong direction. Hope this helps.
5459 27 Aug 2017 @ 1325 27 Aug 2017 @ 1425 minissa Noted voluminous steam not Bijou while awaiting Grotto. Sat in cage through several short (2 min) Bijou pauses. Noted depth charging in back Mastiff plus some frank splashing with decent volume although only 1-2 feet in height, also some vertical (B Vent?) splashing from Giant. However, the activity in Mastiff was not coordinated with Bijou pauses and I did not see water rise in front Mastiff with any pause. Back Mastiff was ejecting quite a bit of water and steam overall, though
3959 03 Mar 2017 @ 1233 --- steve All the signs are in place at Giant, frozen in place
2637 24 Dec 2015 @ 1230 --- Tara Platform covered in snow, no eruption since 9/28/15.
2471 04 Oct 2015 @ 0710 --- JimS Bijou strong. Mastiff depth charging.
2467 03 Oct 2015 @ 1904 --- WillBoekel Foot bath for about 30 sec
2463 03 Oct 2015 @ 0815 --- JimS Platform quiet. Bijou quiet. Trying to recover from Grotto marathon.
2450 01 Oct 2015 @ 0700 --- JimS Bijou strong. Grotto eruption now is not a continuation of yesterday's marathon.
2448 30 Sep 2015 @ 2105 30 Sep 2015 @ 2310 Jake Post Grotto marathon...Bijou off. occasional light spitting from Catfish. Nothing out of Mastiff but steam. Giant noisy with occasional water visible. Light steam from Feather.
2445 30 Sep 2015 @ 1630 --- Jake Bijou off. Grotto in marathon.
2436 29 Sep 2015 @ 0820 29 Sep 2015 @ 1000 JimS Bijou strong with no pauses. Mastiff depth charging strongly to 1 or 2 feet at times. Catfish some sprinkling. Water in Giant with left to right splashing at times.
2433 28 Sep 2015 @ 1415 --- Tara Water visible in Giant. Everything else on the platform was gently steaming.
2430 28 Sep 2015 @ 0834 --- JimS Found that the Giant sign was rolled under the cage and lots of water on the boardwalk north of Giant platform. Danger sign also looks moved and grass in runoff channel flattened. Certainly looks like a Giant eruption.
1193 11 Jul 2014 @ 1200 11 Jul 2014 @ 1800 JSJ Giant Geyser was engaged in its usual small to moderately small splashing - observed in the afternoon of 11 July 2014.
1050 25 Apr 2014 @ 0000 --- WillBoekel Logs are still on the platform :(
1225 04 Jun 2013 @ 1200 04 Jun 2013 @ 1800 JSJ Giant Geyser was engaged in its usual, intermittent, visibly low splashing eruption behavior - observed in the early afternoon of 4 June 2013.
774 20 Apr 2013 @ 0000 20 Apr 2013 @ 2359 WillBoekel Signs are still on the platform. Please wake up Giant!!!
953 28 Apr 2008 @ 0000 28 Apr 2008 @ 2359 BoekelUpload signs washed; see 4/16; marker replaced
950 05 Apr 2008 @ 0000 05 Apr 2008 @ 2359 BoekelUpload signs replaced 4/5 see 4/4
949 26 Mar 2008 @ 1835 --- BoekelUpload signs replaced 18:35 -- see 3/22
938 12 Feb 2008 @ 0000 12 Feb 2008 @ 2359 BoekelUpload signs replaced
936 11 Feb 2008 @ 0000 11 Feb 2008 @ 2359 BoekelUpload overnight, see 2/9 [Note: No eruption overnight 2/11]
933 05 Feb 2008 @ 0000 05 Feb 2008 @ 2359 BoekelUpload signs replaced 2/5
928 29 Jan 2008 @ 0930 --- BoekelUpload signs replaced ~ 09:30
732 26 Jan 2008 @ 0000 27 Jan 2008 @ 2359 Tara Giant signs washed sometime on January 26 or 27.
921 14 Jan 2008 @ 0915 --- BoekelUpload signs replaced ~ 09:15
919 13 Jan 2008 @ 1630 --- BoekelUpload signs still in place as of ~16:30 or so
914 04 Jan 2008 @ 1430 --- BoekelUpload signs replaced~14:30
1302 22 Dec 2007 @ 0930 --- BoekelUpload signs replaced ~09:30
740 14 Dec 2007 @ 0000 20 Dec 2007 @ 2359 Tara Giant eruption occurred sometime between December 14 and December 20, 2007. No further information is available.
1301 20 Dec 2007 @ 0945 --- BoekelUpload sign straightened ~ 9:45; eruption between 12/14 - 12/20
1300 14 Dec 2007 @ 0000 14 Dec 2007 @ 2359 BoekelUpload signs in place
741 03 Dec 2007 @ 0000 07 Dec 2007 @ 2359 Tara Eruption inferred sometime between December 3 and December 7, 2007. No further information is available.
1299 07 Dec 2007 @ 1510 --- BoekelUpload between 12/3
1298 29 Nov 2007 @ 0000 29 Nov 2007 @ 2359 BoekelUpload "Danger sign replaced (Giant sign frozen under platform)
1297 21 Nov 2007 @ 1500 --- BoekelUpload signs replaced 15:00
1296 17 Nov 2007 @ 1700 --- BoekelUpload signs replaced 17:00
1295 04 Oct 2007 @ 2000 05 Oct 2007 @ 0800 BoekelUpload overnight 10/4-10/5
1294 22 Sep 2007 @ 2000 23 Sep 2007 @ 0800 BoekelUpload overnight 9/22-9/23
3888 09 Sep 2006 @ 0645 --- Tara Water visible in Emerald Vent during marathon recovery.
858 10 Jul 2006 @ 1006 --- Tara Bathtub 1006.
855 07 Jul 2006 @ 2016 --- Tara Bathtub 2016.
851 03 Jul 2006 @ 0934 --- Tara Bathtub 0934.
852 03 Jul 2006 @ 0833 --- Tara Footbath 0833. Water barely visible in Mastiff.
850 29 Jun 2006 @ 0910 --- Tara Bathtub 0910.
849 28 Jun 2006 @ 1659 --- Tara Bathtub 1659.
848 28 Jun 2006 @ 1505 --- Tara Bathtub 1505. Tara Cross hot period log.
847 27 Jun 2006 @ 1503 --- Tara Bathtub 1503.
846 13 Jun 2006 @ 1051 --- Tara Bathtub 1051. Tara Cross hot period log.
845 13 Jun 2006 @ 0908 --- Tara Bathtub 0908. Tara Cross hot period log.
844 05 Jun 2006 @ 0920 --- Tara Bathtub 0920. Tara Cross hot period log.
843 04 Jun 2006 @ 1130 --- Tara Bathtub 1130. Tara Cross hot period log.
842 04 Jun 2006 @ 1030 --- Tara Bathtub 1030
841 30 May 2006 @ 1002 --- Tara Bathtub 1002
840 21 Mar 2006 @ 1229 --- Tara Bathtub @ 1229
EntrySourceLinkComment
13 Aug 2018 @ 0050 JSJ https://www.flickr.com/photos/jsjgeology/43381877975 Photo (1 of 3) of Giant Geyser's 12:50 to 2:01 AM eruption on 13 August 2018.
20 Jun 2018 @ 1414 Tara https://youtu.be/EY74M-MaWuM Video by Tara Cross.
09 Jun 2018 @ 1313 Tara https://youtu.be/clm0ZNYMqr8 Video by Tara Cross.
09 Jun 2018 @ 1313 JSJ https://www.flickr.com/photos/jsjgeology/albums/72157670860978848 Photo album of Giant Geyser's 1:13 to 2:31 PM eruption on 9 June 2018 (105 photos).
09 Jun 2018 @ 1313 JSJ https://www.youtube.com/watch?v=5yG-Ld1C3zw#t=5m13s Clips 12-43 of this video compilation (time stamp 5:13 to the end) show a Giant hot period & Giant Geyser's 1:13 to 2:31 PM eruption on 9 June 2018.
04 May 2018 @ 1720 JSJ https://www.flickr.com/photos/godsfireworks/41211489255 On-site photo by Micah Kipple of Giant Geyser's 5:20 to 6:23 PM eruption on 4 May 2018.
04 May 2018 @ 1720 JSJ https://www.flickr.com/photos/jsjgeology/41178429704/ Web camera screen capture of Giant Geyser's 5:20 to 6:23 PM eruption on 4 May 2018.
05 Feb 2018 @ 0000 EricZ https://www.youtube.com/watch?v=CIz1_k0UhR8&feature=youtu.be&t=6m51s Link to the YouTube Video for the evening of 2/4 @ 2350
07 Jul 2017 @ 1530 JSJ https://www.youtube.com/watch?v=3B_8zB_a-UQ Video of part of Giant Geyser's afternoon eruption on 7 July 2017.
07 Jul 2017 @ 1530 JSJ https://twitter.com/miguelazos/status/883505494307987456 Video of part of Giant Geyser's afternoon eruption on 7 July 2017.
07 Jul 2017 @ 1530 JSJ https://www.youtube.com/watch?v=rWsiSAIMKSg Video of part of Giant Geyser's afternoon eruption on 7 July 2017.
08 Sep 2007 @ 1532 Micah Kipple https://www.youtube.com/watch?v=0x7Qz_9dqk0 Video taken by Tara Cross with excellent footage of both vents of Mastiff Geyser
28 Sep 2015 @ 0503 JSJ https://www.youtube.com/watch?v=dTJ0rDL51bQ See the 11:51 (& onward) mark in this video for the best view of the big steam cloud.
28 Sep 2015 @ 0503 td http://i60.tinypic.com/2i9nfo8.jpg This was at 5:07.
28 Sep 2015 @ 0503 td http://i61.tinypic.com/2hdwbqf.jpg Maybe webcam pic from Castle (5:47) posting would help you.
29 Aug 2005 @ 1100 David http://www.flickr.com/photos/33245044@N00/83464899/in/photolist-8nMcZ-8nMr3-8nMr7-8nMr9-8nMra-8nMrb-dRhK6-eN4xp-iwqiX-iwrnf-iyYHU-iyYLe-mYgDr-q6RUN-qcnDE-qMyej-qMyen-Ch9Kv-MBoEN-ME9K7-ME9PG-N5x7p-N8c6c-2aAt7c-2GdYen-2Ge1NM-2Ge2e6-2Ge3GT-2Ge4ZF-2GihmN-2GiiDo-2GijgQ-2GijxQ-2Gik13-2Gimk5-2Gin4N-2Gip8o-2TZCd6-2UyVMb-32FgGc-46WhDZ-471o33-4uYgFW-4uYgGu-4wZnY4-4Dq7gG-4Dq7hq-4YfRw1-5p2Ba6-5p8nhe-5pcDxs flickr. Giant. 29 Aug 2005.
03 Jul 2006 @ 1925 Tara https://www.youtube.com/watch?v=K5iWNWXb-pM Video of Giant start by Eric Hatfield.
03 Jul 2006 @ 1925 Tara https://www.youtube.com/watch?v=1o9QGEJgPUk Video of Giant start by Thomas Barger.
18 Jul 2007 @ 0808 Tara http://www.youtube.com/watch?v=vUII4yGTWJE Video of eruption by David Schwarz
30 Aug 2007 @ 1017 Tara https://www.youtube.com/watch?v=LwN6VNeqehI
BaselineDistance (ft)Description
S. Bike Path 350On bike path by the benches near the south Daisy trail.
South Boardwalk 300South southwest along jugwalk toward Oblong Geyser
South boardwalk (near) 200On the east side of the walk toward Oblong Geyser


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