Last Known Eruption
65d 11h 47m ago

Latest Eruptions

EruptionDurationInterval
19 Jan 2017 @ 1814 ? wc37d 33m
13 Dec 2016 @ 1741 ns wc34d 2h 47m
09 Nov 2016 @ 1453 E4d 6h 40m
05 Nov 2016 @ 091332m 14d 14h 44m
21 Oct 2016 @ 1828 E5d 10h 54m
16 Oct 2016 @ 0734 wc7d 13h 21m
08 Oct 2016 @ 181329m 7d 20h 34m
30 Sep 2016 @ 2138 E3d 9h 39m
27 Sep 2016 @ 115936m 4d 6h 5m
23 Sep 2016 @ 0554 wc5d 2h 37m
18 Sep 2016 @ 0317 wc7d 4h 50m
10 Sep 2016 @ 2227 wc7d 11h 41m
03 Sep 2016 @ 104637m 5d 20h 33m
28 Aug 2016 @ 141333m 6d 1h 20m
22 Aug 2016 @ 125333m 4d 8m
18 Aug 2016 @ 124529m 4d 1h 55m
14 Aug 2016 @ 105033m 5d 21h 41m
08 Aug 2016 @ 130933m 4d 21h 9m
03 Aug 2016 @ 160035m 5d 19h 57m
28 Jul 2016 @ 200333m 4d 23h 16m
23 Jul 2016 @ 204731m 4d 15h 10m
19 Jul 2016 @ 053730m 4d 6h 48m
14 Jul 2016 @ 224929m 5d 10h 19m
09 Jul 2016 @ 123030m 4d 22h 8m
04 Jul 2016 @ 142236m 9d 19h 29m
24 Jun 2016 @ 185332m 4d 6h 5m
20 Jun 2016 @ 124835m 4d 19h 49m
15 Jun 2016 @ 165937m 7d 20h 4m
07 Jun 2016 @ 2055>33m 6d 19h 57m
01 Jun 2016 @ 0058 wc6d 5h 3m
25 May 2016 @ 1955 ie9d 19h 55m
16 May 2016 @ 0000 A6d 2h 0m
09 May 2016 @ 2200 A5d 9h 20m
04 May 2016 @ 12406d 12h 40m
28 Apr 2016 @ 0000 A5d 3h 29m
22 Apr 2016 @ 2031 wc6d 4h 57m
16 Apr 2016 @ 153433m 21d 17h 7m
25 Mar 2016 @ 2227 ? wc5d 2h 35m
20 Mar 2016 @ 1952 wc14d 10h 46m
06 Mar 2016 @ 0806 wc19d 11h 52m
15 Feb 2016 @ 2014 wc23d 6h 19m
23 Jan 2016 @ 1355 wc11d 13h 5m
12 Jan 2016 @ 0050 wc4d 19h 55m
07 Jan 2016 @ 0455 wc7d 18h 40m
30 Dec 2015 @ 1015 A16d 5h 31m
14 Dec 2015 @ 0444 wc18d 4h 49m
25 Nov 2015 @ 2355 wc16d 23h 55m
09 Nov 2015 @ 0000 A13d 3h 32m
26 Oct 2015 @ 2128 wc19d 2h 29m
07 Oct 2015 @ 185940d 9h 27m
28 Aug 2015 @ 093232m 126d 13h 3m
23 Apr 2015 @ 2029 ie wc114d 5h 29m
30 Dec 2014 @ 1400 wc6d 14h 0m
24 Dec 2014 @ 0000 A11d 0m
13 Dec 2014 @ 0000 A43d 11h 40m
30 Oct 2014 @ 13204d 13h 20m
26 Oct 2014 @ 0000 A11d 9h 38m
14 Oct 2014 @ 142229 m. +5d 1h 32m
09 Oct 2014 @ 12506d 12h 50m
03 Oct 2014 @ 0000 ? A6d 8h 59m
26 Sep 2014 @ 15014d 16h 1m
21 Sep 2014 @ 2300 A6d 9h 0m
15 Sep 2014 @ 14006d 16h 40m
08 Sep 2014 @ 2120 A9d 7h 51m
30 Aug 2014 @ 132932m 6d 5h 4m
24 Aug 2014 @ 082534m 7d 4h 55m
17 Aug 2014 @ 0330 A4d 8h 34m
12 Aug 2014 @ 185630m 5d 18h 56m
07 Aug 2014 @ 0000 A4d 0m
03 Aug 2014 @ 0000 A5d 18h 16m
28 Jul 2014 @ 0544 wc9d 18h 34m
18 Jul 2014 @ 1110 ns31m 2d 23h 27m
15 Jul 2014 @ 114333m 5d 11h 43m
10 Jul 2014 @ 0000 A11d 0m
29 Jun 2014 @ 0000 A4d 12h 0m
24 Jun 2014 @ 1200 A88d 12h 0m
28 Mar 2014 @ 0000 A47d 11h 0m
08 Feb 2014 @ 1200 ns11d 19h 37m
27 Jan 2014 @ 1623 ns wc31d 4h 23m
27 Dec 2013 @ 1200 A9d 22h 43m
17 Dec 2013 @ 1317 ie14d 3h 14m
03 Dec 2013 @ 1003 ie wc25d 1h 25m
08 Nov 2013 @ 0838 ie wc14d 9h 38m
25 Oct 2013 @ 0000 A5d 9h 50m
19 Oct 2013 @ 141035m 22d 22h 35m
26 Sep 2013 @ 1535 ie wc5d 23h 37m
20 Sep 2013 @ 155832m 11d 1h 18m
09 Sep 2013 @ 144033m 11d 14h 40m
29 Aug 2013 @ 0000 A13d 4h 54m
15 Aug 2013 @ 1906 ns8d 12h 52m
07 Aug 2013 @ 0614 ie6d 21h 7m
31 Jul 2013 @ 0907 ie8d 7h 51m
23 Jul 2013 @ 0116 nsoff at ~013913d 3h 45m
09 Jul 2013 @ 2131~33m 6d 21h 31m
03 Jul 2013 @ 0000 A250d 5h 8m
25 Oct 2012 @ 1852 ie wc6d 3h 9m
19 Oct 2012 @ 15432d 15h 43m
17 Oct 2012 @ 0000 A4d 0m
13 Oct 2012 @ 0000 A4d 11h 37m
08 Oct 2012 @ 12233d 23h 38m

Interval Statistics

Interval Count100
Min2d 15h 43m
Max250d 5h 8m
Mean15d 16h 23m
Median6d 18h 18m

Latest Notes

Note IDStart TimeEnd TimeEntrantNote
3914 22 Jan 2017 @ 1500 --- Graham Layer of ice under an inch or two of fresh snow. Maybe from Thursday?
3910 19 Jan 2017 @ 1814 --- Graham Probably wishful thinking but it looked like steam in the right spot on the webcam and too early for Riverside. Pretty dark though. GO F&M!
3839 04 Nov 2016 @ 0905 --- steve No eruption of Fan & Mortar from 10-30-16 at 1300 to 11-4-16 at 0900.
3833 31 Oct 2016 @ 1036 --- steve No F & M overnight
3834 30 Oct 2016 @ 1301 --- steve A short event cycle. River on 1301. Main vent splashes at 1309 and 1313 only. River off 1314. River on 1324, gold 1334, angle 1339. For several minutes High varied from 1 to 6 feet every 3 seconds, then it increased to 4 to 8 feet for 2 minutes, then everything died.
3829 29 Oct 2016 @ 1621 --- DanS Cycles but no eruption this afternoon. Lower Mortar strong.
3816 26 Oct 2016 @ 1400 --- DanS Cycles. No eruption
3807 25 Oct 2016 @ 1400 --- DanS Event cycle. Stronger action than Sunday.
3799 23 Oct 2016 @ 1231 --- Janet White area not washed.
3794 21 Oct 2016 @ 1837 21 Oct 2016 @ 1843 Pat Snyder Possible F&M ie at 1837 webcam? Steam in the right spot. Riverside not due, based on the on-site time from earlier today (8 hours ago).
3790 16 Oct 2016 @ 0608 --- SteveO No F&M yet.
3789 15 Oct 2016 @ 1720 --- Kitt B No Fan and Mortar yet
3786 15 Oct 2016 @ 0630 --- SteveO No F&M yet.
3783 14 Oct 2016 @ 0920 --- Kitt B No fan and Mortar yet
3762 08 Oct 2016 @ 0755 --- SteveO No eruption yet.
3761 07 Oct 2016 @ 1826 --- Kitt B No eruption as of 1826.
3757 07 Oct 2016 @ 0957 --- Kitt B No eruption yet.
3677 17 Sep 2016 @ 0648 --- JimS No eruption yet.
3673 16 Sep 2016 @ 0659 --- JimS No eruption yet.
3672 15 Sep 2016 @ 2100 --- RLJones no eruption yet but very large & noisy steam bursts from main during what appeared to be a R on from 2035 to 2045. F&M unattended after 2100.
3666 15 Sep 2016 @ 0650 --- JimS No eruption yet.
3645 11 Sep 2016 @ 1330 11 Sep 2016 @ 1525 Tara Recovery cycle activity. Bottom Vent was in eruption at 1330, and still erupting when I returned at 1350, with brief pauses every few minutes and some low splashes in Lower Mortar. It continued until 1406 when River came on. There was steam in Main during Bottom's activity but I did not see a splash. The apron below Gold was completely dry; Gold was on at 1417 but very weak with no overflow. Angle splash at 1419, fully on at 1422. Bottom was i.e. again at 1525.
3640 10 Sep 2016 @ 2036 --- WillBoekel no eruption yet
3634 10 Sep 2016 @ 0650 --- JimS No eruption yet.
3627 09 Sep 2016 @ 0638 --- JimS No eruption yet.
3621 08 Sep 2016 @ 0630 --- JimS No eruption yet.
3595 03 Sep 2016 @ 0623 --- JimS No eruption yet.
3593 02 Sep 2016 @ 0624 --- JimS No eruption yet.
3560 28 Aug 2016 @ 0620 --- JimS No eruption yet.
3554 27 Aug 2016 @ 0615 --- JimS No eruption yet.
3550 26 Aug 2016 @ 2250 --- WillBoekel no eruption yet. Need to get sleep before work in morning.
3523 22 Aug 2016 @ 0612 --- JimS No eruption yet.
3491 14 Aug 2016 @ 0555 --- JimS No eruption yet.
3484 13 Aug 2016 @ 0450 --- Archer No eruption yet, and currently unattended because I saw a pair of eyes down there and did not wish to tempt fate. When I left, River had turned off but Angle was still spritzing. I will return closer to dawn.
3443 08 Aug 2016 @ 0550 --- JimS No eruption yet.
3440 07 Aug 2016 @ 2100 --- Tara Unattended.
3438 07 Aug 2016 @ 1000 --- AndrewW No eruption yet as of 1000 this morning, came up on horrendous water levels but the run off channels of bottom vent conpletely wet to the river. Perhaps it is late in an event cycle
3407 02 Aug 2016 @ 2200 --- WillBoekel no eruption yet. leaving unattended until about 0100-0200. just had a decent event cycle that did not lead to an eruption.
3405 02 Aug 2016 @ 0540 --- Suzanne No eruption as of 0540.
3403 01 Aug 2016 @ 2130 --- Tara Unattended.
3392 01 Aug 2016 @ 1845 --- Tara No eruption yet, likely late in event cycle. Bottom Vent runoff channel recently wet, all minor vents on. High steady for 5 minutes and low surges in Upper Mortar but no lock and no eruption.
3383 28 Jul 2016 @ 0545 --- JimS No eruption yet.
3381 27 Jul 2016 @ 2250 --- Tara No eruption yet. Bottom Vent channel wet, probably had events in previous cycle.
3352 23 Jul 2016 @ 0539 --- JimS No eruption yet.
3301 14 Jul 2016 @ 0530 --- JimS No eruption yet.
3272 09 Jul 2016 @ 1148 --- Kitt B radioed splashing in Main and all other Fan Vents quet
3268 09 Jul 2016 @ 0600 --- deanl no eruption yet
3198 04 Jul 2016 @ 0500 --- Graham No F&M yet.
3186 03 Jul 2016 @ 0445 --- Graham No F&M yet
3171 02 Jul 2016 @ 0445 --- Graham No F&M yet.
3170 01 Jul 2016 @ 2135 --- Graham Unattended
3161 01 Jul 2016 @ 0448 --- Graham No F&M yet.
3160 30 Jun 2016 @ 2130 --- WillBoekel Now unattended. No eruption yet.
3156 30 Jun 2016 @ 0514 --- JimS No eruption yet.
3155 29 Jun 2016 @ 2130 --- Tara Unattended.
3152 29 Jun 2016 @ 0519 --- JimS No eruption yet.
3149 28 Jun 2016 @ 2230 --- Tara Fan & Mortar unattended.
3127 24 Jun 2016 @ 0554 --- JimS No eruption yet.
3068 15 Jun 2016 @ 0543 --- JimS No eruption yet.
3067 14 Jun 2016 @ 2130 --- WillBoekel No eruption yet.
3064 14 Jun 2016 @ 0514 --- JimS No eruption yet.
3062 13 Jun 2016 @ 2230 --- WillBoekel has not erupted yet. Got flushed out by a grizzly bear back by the pit toilet. Went back to dorm. Night watch shifts have been cancelled for the night.
3000 07 Jun 2016 @ 0505 07 Jun 2016 @ 0551 JimS No eruption yet. Normal cycle 0545, Angle 0551.
2998 07 Jun 2016 @ 0015 --- WillBoekel No eruption yet. Had strong event cycle with a false lock. We both left after this and plan to have one of us be back early in the morning.
2997 06 Jun 2016 @ 2240 --- WillBoekel No eruption yet.
2991 06 Jun 2016 @ 0810 --- cb No F&M yet!
2891 25 May 2016 @ 1029 --- WillBoekel No eruption yet.
2885 24 May 2016 @ 1234 --- WillBoekel has not erupted yet
2857 20 May 2016 @ 0602 --- JimS No eruption yet.
2846 15 May 2016 @ 0534 --- Graham Down basin steam on webcam in the vicinity of F&M. Believe Riverside erupted earlier so unsure what is going on.
2848 15 May 2016 @ 0532 --- JimS See note on Riverside.
2833 10 May 2016 @ 0755 --- WillBoekel erupted overnight. area washed.
2827 09 May 2016 @ 0830 --- WillBoekel No eruption yet.
2804 30 Apr 2016 @ 1229 --- WillBoekel catch basins full and area washed. last check that I know of was last Sunday
2780 23 Apr 2016 @ 0934 --- WillBoekel eruption from last night confirmed
2765 18 Apr 2016 @ 1610 18 Apr 2016 @ 1710 Polly Bottom Vent rumbles w/little splashes before River on ~1614; 1618 Gold thick & strong; 1623 Angle; 1628 Gold steam; 1709 River off. Main Vent steam off & on throughout.
2720 03 Apr 2016 @ 1326 --- Bijoumonkey Marker replaced. Catch basins empty - no recent eruption (since 3/25?)
2715 22 Mar 2016 @ 1600 --- Bijoumonkey Erupted since 3/19/16 - marker replaced.
2704 06 Mar 2016 @ 0807 --- Betty Big plume in the right area.
2640 30 Dec 2015 @ 1015 --- AndreaEide Snow around boardwalk next to Fan and Mortar was slushy. One visitor said that they were drenched.
2636 24 Dec 2015 @ 1245 --- Tara Formation covered with snow, no ice on boardwalk. No eruption recently.
2628 16 Dec 2015 @ 1000 --- LPEhler Snow still blankets the run off channel of these sleeping geysers...
2629 06 Dec 2015 @ 1630 --- Bijoumonkey Erupted since 11/30/15. Marker replaced.
2626 30 Nov 2015 @ 1500 --- Bijoumonkey Erupted since 11/14/15. Marker replaced.
2611 12 Nov 2015 @ 1340 --- Bijoumonkey Erupted since 11/04/15. Marker replaced.
1554 02 May 2015 @ 1900 --- Jake has not erupted in the past several days
1539 19 Apr 2015 @ 1730 25 Apr 2015 @ 0900 WillBoekel has erupted in the past week (4/19-4/25). will post an approximate time after I talk to people in the basin.
1521 12 Mar 2015 @ 0930 --- LPEhler Marker still present.
1517 04 Feb 2015 @ 0940 --- LPEhler Marker still present at Fan and Mortar.
1502 15 Jan 2015 @ 0930 --- LPEhler Marker still present at geyser.
1499 08 Jan 2015 @ 1124 --- LPEhler Snow and the marker still present on Fan and Mortar.
1493 24 Dec 2014 @ 1030 24 Dec 2014 @ 1149 ACarlson No pile of rocks or snow visible at geyser. Eruption in the last few days.
1443 09 Oct 2014 @ 0745 --- cb Fan & Mortar has not erupted as of 0745
1442 08 Oct 2014 @ 1730 08 Oct 2014 @ 1830 cb Had an event cycle at approx 1730 that included 1 splash from main vent and water levels that were interesting for a short time. No Fan & Mortar as of 1830.
1441 08 Oct 2014 @ 1031 --- cb NO FAN AND MORTAR YET! (AS OF 1031)
1440 07 Oct 2014 @ 1535 --- billwarnock Have not erupted as of 1535 though has had several event cycles, one with double River pause, and decent water levels in High and Gold.  Only one light splash from Main shortly after River on at 1459.
1439 07 Oct 2014 @ 0700 --- cb has not erupted as of 0700
1438 06 Oct 2014 @ 1930 --- cb No Fan and Mortar as of 1930
1431 04 Oct 2014 @ 0630 --- Jake did not erupt overnight, as of 0630
1436 03 Oct 2014 @ 1900 03 Oct 2014 @ 2100 WillBoekel at sunset mortar's catch basins seemed pretty full for the amount of precipitation in the past few days. but could not tell for sure if F&M had erupted
EntrySourceLinkComment
04 Aug 2009 @ 0930 Tara https://youtu.be/j6kgoHwTRVg Video by Tara Cross.
22 Jul 2009 @ 1705 Tara https://youtu.be/SXrTs60JXFU Video by Tara Cross.
24 Aug 2008 @ 0856 Tara https://youtu.be/tXbXAvnTAqo Video by Tara Cross.
03 Sep 2016 @ 1046 JSJ https://www.youtube.com/watch?v=fHBNk8QUtOc Another video showing the lead-up & initiation of Fan & Mortar Geysers' late morning eruption on 3 September 2016 (the action starts at time stamp 3:44).
27 Sep 2016 @ 1159 JSJ https://www.youtube.com/watch?v=jTesyPxEi1k Video of Fan & Mortar Geysers' noon-time eruption on 27 September 2016.
03 Sep 2016 @ 1046 JSJ https://www.youtube.com/watch?v=Wi4GAkZtZ6Q Video of lead-up & initiation of Fan & Mortar Geysers' late morning eruption on 3 September 2016.
03 Aug 2016 @ 1600 JSJ https://www.youtube.com/watch?v=M4D-IWcJ0RM Video of Fan & Mortar Geysers' 4:00 PM-onward eruption on 3 August 2016.
04 Jul 2016 @ 1422 JSJ https://www.flickr.com/photos/jsjgeology/28118687280 Thermal image (1 of 6) of Fan Geyser's 2:22 to 2:58 PM eruption on 4 July 2016.
04 Jul 2016 @ 1422 JSJ https://www.flickr.com/photos/jsjgeology/27755417113 Photo (1 of 10) of Fan Geyser's 2:22 to 2:58 PM eruption on 4 July 2016.
04 Jul 2016 @ 1422 JSJ https://www.youtube.com/watch?v=dqqb0EG5ODE#t=12m40s Clips 24-36 of this video compilation (time stamp 12:40-onward) show Fan Geyser's 2:22 to 2:58 PM eruption on 4 July 2016.
23 Jan 2015 @ 1317 WillBoekel https://www.youtube.com/watch?v=jfzijBk43wc&list=PLROlDXCUlcDtsmrLRYTjg8BqhsS_TXTB2&index=6 Here is the capture from that day Don't see any F&M steam at 1317 or after that point.
27 Jul 2010 @ 1956 Tara https://www.youtube.com/watch?v=D2MA9VbvFBA&feature=youtu.be Video of eruption by Tara Cross. Eruption starts at about 7:50 in the video.
30 Sep 2012 @ 1148 Micah Kipple https://www.youtube.com/watch?v=fuM2EV8SVx8 Will Boekel Video
13 Jun 2010 @ 1628 Micah Kipple https://www.youtube.com/watch?v=-6jwMgW4TX8 Another angle
13 Jun 2010 @ 1628 Micah Kipple https://www.youtube.com/watch?v=OskvCNPAoeQ Video
11 Jul 2001 @ 1228 Micah Kipple https://www.youtube.com/watch?v=qxnA2ZlMxpY David Schwarz Video
05 Nov 2014 @ 0953 WillBoekel https://www.facebook.com/photo.php?fbid=10152501200878723&set=pcb.10152519037592399&type=1&theater Post in FB Geyser Gazers
15 Sep 2014 @ 1400 WillBoekel https://www.youtube.com/watch?v=VYfQqNzoHEQ Found a video that was posted by a visitor
12 Aug 2014 @ 1856 WillBoekel https://www.youtube.com/watch?v=bXwoxoU_Jc8 Go Pro Video
12 Aug 2014 @ 1856 Jake https://www.youtube.com/watch?v=6utBOWBDiOQ Video from Mara (Archer)
BaselineDistance (ft)Description
Rock 100Both markers are on a rock behind the benches on the upstream side of the path


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