Last Known Eruption
4d 4h 47m ago

Latest Eruptions

Eruption DurationInterval
23 Sep 2022 @ 1548 ie min20h 4m
22 Sep 2022 @ 1944 min3d 2h 15m
19 Sep 2022 @ 1729 ie10h 53m
19 Sep 2022 @ 0636 min3m 22h 50m
18 Sep 2022 @ 0746 ie17h 1m
17 Sep 2022 @ 1445 ie wc min1d 3h 3m
16 Sep 2022 @ 1142 min10m 18h 10m
15 Sep 2022 @ 1732 min15m 1d 19h 15m
13 Sep 2022 @ 2217 ie min3d 5h 32m
10 Sep 2022 @ 1645 min10m 8h 6m
10 Sep 2022 @ 0839 ie min>9m 7h 40m
10 Sep 2022 @ 0059 ns min>16m 13h 43m
09 Sep 2022 @ 1116 ie min2d 18h 16m
06 Sep 2022 @ 1700 A2d 3h 27m
04 Sep 2022 @ 1333 min13m 7d 22h 57m
27 Aug 2022 @ 1436 ie wc6d 20h 49m
20 Aug 2022 @ 1747 ns10d 21h 1m
09 Aug 2022 @ 2046 ns min13m 7d 6h 0m
02 Aug 2022 @ 1446 ie min4d 2h 11m
29 Jul 2022 @ 1235 ie13d 18h 18m
15 Jul 2022 @ 1817 ie95d 1h 36m
11 Apr 2022 @ 1641 ie wc7d 8h 28m
04 Apr 2022 @ 0813 wc16d 44m
19 Mar 2022 @ 0729 ie wc12d 21h 8m
06 Mar 2022 @ 0921 ie4d 15h 24m
01 Mar 2022 @ 1757 ie wc7h 27m
01 Mar 2022 @ 1030 ie4d 16h 40m
24 Feb 2022 @ 1750 ie wc5d 3h 31m
19 Feb 2022 @ 1419 wc min<26m 5d 3h 50m
14 Feb 2022 @ 1029 ie wc20h 11m
13 Feb 2022 @ 1418 ie7d 4h 14m
06 Feb 2022 @ 1004 ie7d 20h 8m
29 Jan 2022 @ 1356 ns min21h 59m
28 Jan 2022 @ 1557 ns min5d 1h 25m
23 Jan 2022 @ 1432 ie5d 14h 32m
18 Jan 2022 @ 0000 A min12h 26m
17 Jan 2022 @ 1134 min13m 11h 34m
17 Jan 2022 @ 0000 A min11h 16m
16 Jan 2022 @ 1244 ie min>14m 22h 30m
15 Jan 2022 @ 1414 ie wc min>19m 1d 21h 41m
13 Jan 2022 @ 1633 min25m 1d 5h 52m
12 Jan 2022 @ 1041 min13m 17d 21h 48m
25 Dec 2021 @ 1253 ns38d 4h 21m
17 Nov 2021 @ 0832 ie wc min15h 8m
16 Nov 2021 @ 1724 ie min3d 5h 42m
13 Nov 2021 @ 1142 ie min1d 23h 21m
11 Nov 2021 @ 1221 wc27d 4m
15 Oct 2021 @ 1317 min~7m 3d 22h 11m
11 Oct 2021 @ 1506 ie min2d 20h 31m
08 Oct 2021 @ 1835 wc min6d 4h 48m
02 Oct 2021 @ 1347 wc min6d 1h 15m
26 Sep 2021 @ 1232 min6m 5d 2h 21m
21 Sep 2021 @ 1011 min28m 4d 18h 35m
16 Sep 2021 @ 1536 min6m 22h 5m
15 Sep 2021 @ 1731 min20m 1d 46m
14 Sep 2021 @ 1645 ns min~18m 1d 21h 17m
12 Sep 2021 @ 1928 min20m 4d 9h 19m
08 Sep 2021 @ 1009 ie3d 18h 48m
04 Sep 2021 @ 1521 ie min4d 3h 11m
31 Aug 2021 @ 1210 ie1d 19h 15m
29 Aug 2021 @ 1655 ie3d 1h 2m
26 Aug 2021 @ 1553 min30m 4d 2h 53m
22 Aug 2021 @ 1300 A min7d 4h 13m
15 Aug 2021 @ 0847 ns min11d 1m
04 Aug 2021 @ 0846 ie22d 23h 45m
12 Jul 2021 @ 0901 ns2h 29m 20d 17h 25m
21 Jun 2021 @ 1536 ie4y 169d 5h 41m
04 Jan 2017 @ 0855 ie1d 20h 46m
02 Jan 2017 @ 1209 ie min38d 6h 13m
25 Nov 2016 @ 0555 E46m 13d 15h 11m
11 Nov 2016 @ 1444 E1h 2m 2d 34m
09 Nov 2016 @ 1410 wc4d 4h 17m
05 Nov 2016 @ 1053 min<1m 6h 58m
05 Nov 2016 @ 0354 E50m 1d 3h 55m
03 Nov 2016 @ 2359 E1h 1m 2d 21h 22m
01 Nov 2016 @ 0237 E2h 35m 16h 11m
31 Oct 2016 @ 1026 E49m 3h 25m
31 Oct 2016 @ 0701 E57m 4d 23h 24m
26 Oct 2016 @ 0737 E13m 10d 15h 37m
15 Oct 2016 @ 160023h 52m
14 Oct 2016 @ 1608 min3h 48m
14 Oct 2016 @ 1220 min2d 20h 7m
11 Oct 2016 @ 1612 E59m 1d 8h 26m
10 Oct 2016 @ 0746 min3d 2h 31m
07 Oct 2016 @ 0514 E20m 2d 22h 5m
04 Oct 2016 @ 0709 E6m 2d 9h 11m
01 Oct 2016 @ 2158 E1h 10m 4h 17m
01 Oct 2016 @ 1741 E44m 1d 3h 47m
30 Sep 2016 @ 1354 ns10h 7m
30 Sep 2016 @ 0346 E1h 32m 6d 18m
24 Sep 2016 @ 0328 E3m 5d 9h 20m
18 Sep 2016 @ 1808 E2m 3d 23h 54m
14 Sep 2016 @ 1814 ns min10h 41m
14 Sep 2016 @ 0733 ie min2d 21h 42m
11 Sep 2016 @ 0950 E11m 2d 15h 58m
08 Sep 2016 @ 1751 E1h 12m 14d 7h 49m
25 Aug 2016 @ 1002 E1h 5m 1d 12h 32m
23 Aug 2016 @ 2130 E1h 5m 2d 9h 11m
21 Aug 2016 @ 1219 ie min1d 2h 20m
20 Aug 2016 @ 0959 min19m 4d 4h 5m

Interval Statistics

Interval Count100
Min3h 25m
Max4y 169d 5h 41m
Mean22d 7h 3m
Median2d 23h 33m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
24115 26 Sep 2022 @ 0824 --- SteveO Steam phase eruption IE.
24110 25 Sep 2022 @ 2336 25 Sep 2022 @ 2346 CrisG gurgling and occasionally tossing a couple drops from the top vent. getting chilly and need to move on.
24090 25 Sep 2022 @ 0905 --- Graham Steam phase 10m after Sawmill quit.
23999 22 Sep 2022 @ 1235 --- Graham Steam phase eruption. Sawmill quit 26m after Spasmodic, likely why no mixed phase.
23891 18 Sep 2022 @ 0808 --- SteveO End at 0808
23816 14 Sep 2022 @ 1144 --- Graham Steam phase eruption. d=10m
23796 13 Sep 2022 @ 1548 --- Graham 2nd steam phase eruption, this one after Sawmill quit.
23794 13 Sep 2022 @ 1523 --- Graham Steam phase started even though Sawmill is still ie. 1531 Sawmill quit and steam phase died away.
23688 09 Sep 2022 @ 1901 --- Graham Steam phase eruption 8m after Sawmill quit and group in deep drain. d=12m
23583 05 Sep 2022 @ 1320 --- Graham Steam phase, Sawmill still ie until 1326
23573 04 Sep 2022 @ 1856 --- DinosaursArentReal water partway filled in multiple holes.Splashing of 1-2 ft out of main hole. splashes of a few inches coming out of 2 of the other holes
23560 04 Sep 2022 @ 1330 --- Graham Steam phase eruption.
23401 25 Aug 2022 @ 0614 --- JimS ie in steam eruption only
23354 22 Aug 2022 @ 1813 --- K.Cooper (wc) Steam phase or mixed phase eruption of some sort. Certainly doing something, Sawmill off at this time. If anyone in-basin has eyes on it, please update this note!
23135 11 Aug 2022 @ 1129 --- JimS Stem phase ie
23115 09 Aug 2022 @ 1350 --- deanl steam phase eruption IE
22867 26 Jul 2022 @ 1716 --- aferrara standing water in vents
22612 16 Jul 2022 @ 1144 --- Brando 2 front pools empty, main vent gurgling with occasional drops of water coming out.
21975 13 Jun 2022 @ 1518 --- Graham Pooling water.
21945 12 Jun 2022 @ 0913 --- Graham Steam phase ie.
21866 09 Jun 2022 @ 1143 --- SteveO water pooling in lower vent, main vent is splashing a little water out the front.
21847 08 Jun 2022 @ 1946 --- Graham Steam phase ie. forcefully puffing steam.
21766 05 Jun 2022 @ 1831 --- Graham Water pooling low in the vents.
21757 05 Jun 2022 @ 1635 --- Graham Vigorous splashing in main vent for 1m. 1655 pools connected. 1728 small splash in main vent. Dropped 1730 with Spasmodic.
21755 05 Jun 2022 @ 1624 --- Graham Pooling water, Tardy cycle.
21712 04 Jun 2022 @ 0736 --- Graham Pooling water. Lost water by 0827 when Spasmodic had dropped too.
21529 27 May 2022 @ 1201 --- Graham Sawmill quit but Spasmodic still ie and Penta pooling water in vents.
21527 27 May 2022 @ 1040 --- Graham Water visible deep in right vrnt. Spasmodic high.
21368 19 May 2022 @ 1800 --- Graham Pooling water.
21366 19 May 2022 @ 1650 --- Graham Pooling water during Tardy cycle. Oval, Churn, Sawill up. Dropped when Spasmodic quit.
21306 16 May 2022 @ 1030 --- Brando Gargling deep in the cone, no water visible.
21142 01 May 2022 @ 1840 --- Ajw water being thrown out of main cone and one side vent.
20789 06 Feb 2022 @ 1010 --- mhvogel Mixed phase eruption ended then transitioned into heavy steam.
20726 18 Jan 2022 @ 1125 --- Graham No eruption on this deep drain. Just gentle steam. Twilight was down before Sawmill quit.
20719 17 Jan 2022 @ 1726 --- Graham Steam phase. Twilight down before Sawmill quit.
20702 16 Jan 2022 @ 0813 --- Graham Steam phase eruption only
20694 14 Jan 2022 @ 1737 --- Graham Penta just steamed gently for 30m after Sawmill quit and the group was in a deep drain. Left due to darkness.
20686 14 Jan 2022 @ 0747 --- Graham Steam phase, no water.
20668 11 Jan 2022 @ 1400 --- Graham Some splashing above main vent. Snow in runoff channel. Thumping Hole splashing at depth. Spasmodic rising, minor boil in front vent, nothing from evil vent.
20079 22 Oct 2021 @ 1436 --- PGuernsey heavily puffing steam
20011 17 Oct 2021 @ 0856 --- aferrara Puffing steam
19768 28 Sep 2021 @ 1025 28 Sep 2021 @ 1042 SteveO 1st huff of steam, force huffing increased until 1035 and then started to decrease. 1042 huffing fairly weak.
19744 26 Sep 2021 @ 1230 --- Graham Forced steam as it starts a deep drain.
19644 18 Sep 2021 @ 1434 --- Graham Forced steam as we go into a deep drain. Sawmill restarted a few minutes ago. No eruption on this deep drain.
19636 17 Sep 2021 @ 1132 --- Graham Pooling water and splashing in main vent and.right pool. dropped and continued to splash as Sawmill came on.
19633 17 Sep 2021 @ 1003 --- Graham Pooling water in vents. Spasmodic ie and close to overflow. Dropped 1022 when Spasmodic quit.
19617 16 Sep 2021 @ 1530 --- Graham Forced steam following the deep drain.
19357 07 Sep 2021 @ 1503 --- Graham Has water visible in front vents and is doing gurgling splashes. Spasmodic is high and ie but not connected and Sawmill is off. Water dropped when Spasmodic quit and it's not a deep drain.
19216 01 Sep 2021 @ 1214 --- Graham Quietly chugging steam as group goes into deep drain. Steam force steadily increasing. Noisy steam phase 1225 to 1230, then declining. Back to gentle chugging steam 1240.
19113 27 Aug 2021 @ 1814 --- Graham Pooling in the vents, bubbling and splashing. Vents are connected. 1840 water dropped but still in vents. No more bubbling. 1853 dropped when Spasmodic ended. No eruption.
19110 27 Aug 2021 @ 1641 --- Graham Pooling water deep in the vents and MV is splashy.
19106 27 Aug 2021 @ 1212 --- Graham Light steam phase.
19014 23 Aug 2021 @ 1539 --- Graham In steam phase. Twilight just below the pillars and dropping very slowly.
18615 23 Jul 2021 @ 2245 --- am Loud gurgling and splashing. Including up to 12 inches from main vent
18477 17 Jul 2021 @ 1436 --- SteveO Steam phase Penta, weak eruption but stronger than yesterday's. Duration 9 minutes.
18457 16 Jul 2021 @ 1605 --- SteveO Steam phase eruption. Little water with for a 1.5 minutes. Huff forceful steam to weak steam about 7 minutes total.
18379 12 Jul 2021 @ 0640 12 Jul 2021 @ 0650 SteveO Lower 2 vents forming a single pool, a little convection over west vent. 0650 water level dropping fast.
18239 02 Jul 2021 @ 1452 --- dank Large pool connecting front vents
18224 01 Jul 2021 @ 1658 --- Graham Grumbling at depth.
18217 01 Jul 2021 @ 0839 --- Graham Gurgling at depth.
18129 28 Jun 2021 @ 1637 --- TheHikingDude Lower two pools connected.
18083 25 Jun 2021 @ 0904 --- K.Cooper side pools connected with strong convection and starting to overflow onto the left. Parasite vent is on but weak.
18049 23 Jun 2021 @ 0715 --- Graham Pools joined.
18002 22 Jun 2021 @ 0745 --- Graham Appreciate start of overflow.
17995 22 Jun 2021 @ 0716 --- K.Cooper Side vents close to overflow, convective. Water pulsating in the main vent.
17959 21 Jun 2021 @ 1211 21 Jun 2021 @ 1244 Tara 1211 water level rising, bubbles in front vents, occasional splashes in main vent that slightly wet the cone. 1220 main vent no longer splashing, front vent pools connected and bubbling. 1233 front vents convecting and pool rising and falling, highest level just to edge of black gravel. 1244 water level onto black gravel, no further bubbling in front vents or splashing from main vent.
17958 21 Jun 2021 @ 1152 --- Tara front vents bubbling and gurgling, main vent spitting, water level several inches down, Spasmodic rising
17957 21 Jun 2021 @ 1000 21 Jun 2021 @ 1104 Tara water level up with convection from front vents, water seen occasionally in main vent
17823 15 Jun 2021 @ 1335 --- Craigmon99 Lower two pools connected
17821 15 Jun 2021 @ 1321 --- Craigmon99 Has water. Pools are disconnected Loose Rocks in lower right vent
17381 02 Jun 2021 @ 1521 --- Bhoffer Water is high enough to connect the two lower vents. The third one is pulsing in the cone.
15118 27 Jul 2020 @ 1135 --- William higher water again, two front vents flooded into each other.
15117 27 Jul 2020 @ 1000 --- William water level dropped enough to separate front two vents
15111 27 Jul 2020 @ 0815 --- William Two vents closest to the boardwalk are flooded together. Third vent is pulsing water within its cone.
14584 10 Jun 2020 @ 1330 --- K.Cooper 2 side vents in overflow
10649 21 Oct 2018 @ 1315 --- rbwhitaker Water is high enough that the two bottom vents' pools have merged into one. Water is hot and steaming, but no boiling in any of the vents. I can see water in one of the cone vents, and it's rising and falling maybe an inch or two every second or two.
10633 20 Oct 2018 @ 1230 --- Golpin Penta was full and making bubbling noises
9478 05 Aug 2018 @ 1700 --- Micah Kipple Hot enough that no bacteria can grow in the vents.
7614 01 Oct 2017 @ 1818 --- minissa per wc, can see pulsatile steam coming from the area of Penta. Can anyone confirm or refute?
3953 17 Feb 2017 @ 1540 --- WillBoekel still no eruptions. big snow drift in runoff chanel
3948 16 Feb 2017 @ 1120 --- WillBoekel has not been active for some time. Big snow drift over runoff chanel.
3915 22 Jan 2017 @ 1400 --- Graham Even though Churn is active, Penta is not. There's a large snow bank in the runoff channel.
3868 06 Nov 2016 @ 1207 --- mhreed Penta's "sixth" vent erupting to four inches through gravel.
3866 06 Nov 2016 @ 1036 --- udo Steam phase eruption
3639 10 Sep 2016 @ 1834 --- Devin C. Boardwalk around Penta is wet, possible mix phase eruption? Sawmill turned off at 1834.
3565 28 Aug 2016 @ 1539 --- sfavor intensity increased over last hour. maybe minor eruption just occurred.
3351 22 Jul 2016 @ 1708 --- Scott Grisso Steam phase eruption at 1706. Ended at 1720
3230 06 Jul 2016 @ 1826 --- Rocco Paperiello duration = 28 min, mixed water and steam, steam phase very loud at times
2771 21 Apr 2016 @ 0930 --- WillBoekel logger deployed for research permit #06094
2677 12 Feb 2016 @ 0901 --- WillBoekel No eruption overnight. snow marker still in place
2486 06 Oct 2015 @ 2130 --- Jake Bottom vents merge together with water not yet to overflow. true overflow probably an hour away
2328 12 Sep 2015 @ 1442 --- mhreed Weak steam phase for ~30s at 1442, and again at 1445.
2265 04 Sep 2015 @ 1521 --- Micah Kipple Gurgling loudly with water out of sight.
2153 14 Aug 2015 @ 1738 14 Aug 2015 @ 1739 JSJ Spouting from main vent at 1738 - didn't have time to reach very high before the eruption crashed at 1739.
1879 10 Jul 2015 @ 0540 --- User34 Runoff channels wet, appears to have erupted overnight
1506 17 Jan 2015 @ 0757 --- WillBoekel snow marker from yesterday is gone.
1127 08 Aug 2014 @ 1046 --- mhreed Steam phase eruption ie at 0146.
787 30 Apr 2013 @ 0900 30 Apr 2013 @ 1120 steve Penta erupted sometime between 0900 and 1120
720 08 Dec 2012 @ 1134 --- Micah Kipple Possible Penta or Old Tardy ie at 1134.
763 03 Sep 2012 @ 1600 03 Sep 2012 @ 1730 Micah Kipple I witnessed Penta having a steam/mixed type eruption sometime between 1600 and 1730, the spray was probably reaching somewhere between 5-10 feet.
EntrySourceLinkComment
22 Aug 2021 @ 1300 SantaFe108 https://flic.kr/p/2miMmeA Video which was found posted by a visitor on Instagram today. Visitor confirmed the date and approx time.
18 May 2015 @ 1827 JSJ https://www.youtube.com/watch?v=NX_0D-GpsAQ#t=2m03s Video of Penta Geyser's eruption initiation to postplay during the evening of 18 May 2015 (time stamp 2:03 to 14:59).
18 May 2015 @ 1827 JSJ https://www.flickr.com/photos/jsjgeology/17623305404 Photo (1 of many) of Penta Geyser's 6:27 to 7:23 PM eruption on 18 May 2015.
08 Jul 1993 @ 1756 JSJ https://www.youtube.com/watch?v=QQOwUuRN6Zo Video by David Schwarz of the initiation of Penta Geyser's 5:56 PM-onward eruption on 8 July 1993.
03 Sep 2012 @ 1704 Micah Kipple http://www.youtube.com/watch?v=4v1SejWbbgE
24 Aug 2011 @ 1844 kcmule http://tinyurl.com/PA1844-08242011
BaselineDistance (ft)Description
West Side 30North side of the walk near Twilight Spring