Last Known Eruption
18d 22h 53m ago

Latest Eruptions

Eruption DurationInterval
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
16 Aug 2016 @ 0554 min1d 9h 33m
14 Aug 2016 @ 2020 E58m 8d 13h 57m
06 Aug 2016 @ 0623 ie min18h 43m
05 Aug 2016 @ 1140 ie min4d 16h 55m
31 Jul 2016 @ 1844 E9m 1d 5h 22m
30 Jul 2016 @ 1322 E6m 1d 11h 32m
29 Jul 2016 @ 0149 E2m 5d 8h 40m
23 Jul 2016 @ 1709 E1h 21m 1d 11h 19m
22 Jul 2016 @ 05501d 19h 14m
20 Jul 2016 @ 1036 min3d 15h 16m
16 Jul 2016 @ 1919 E30m 5d 6h 58m
11 Jul 2016 @ 1221 E35m 4d 17h 53m
06 Jul 2016 @ 1828 min2d 2h 28m
04 Jul 2016 @ 1600 ie min2d 23h 9m
01 Jul 2016 @ 1651 ie min22h 1m
30 Jun 2016 @ 1850 ie min1d 10h 26m
29 Jun 2016 @ 0824 min2h 9m
29 Jun 2016 @ 0615 ie min3d 11h 25m
25 Jun 2016 @ 1850 ie min5d 22h 17m
19 Jun 2016 @ 2032 E1h 20m 15h 3m
19 Jun 2016 @ 05291h 25m 1d 1h 16m
18 Jun 2016 @ 0412 E10m 3d 3h 25m
15 Jun 2016 @ 0046 E12m 2d 4h 28m
12 Jun 2016 @ 20181h 25m 2d 12h 56m
10 Jun 2016 @ 0722 ie5d 16h 0m
04 Jun 2016 @ 1521 E1h 2m 11d 16m
24 May 2016 @ 1505 ie min20h 34m
23 May 2016 @ 1830 E27m 12h 7m
23 May 2016 @ 0623 ie min3d 12h 14m
19 May 2016 @ 1808 E48m 11d 40m
08 May 2016 @ 1728 E3m 2d 9h 58m
06 May 2016 @ 0730 E1h 29m 1d 3h 49m
05 May 2016 @ 0340 E15m 1d 1h 59m
04 May 2016 @ 0141 E52m 1d 12h 33m
02 May 2016 @ 1308 E52m 5d 14h 59m
26 Apr 2016 @ 2208 E33m 5d 10h 38m
21 Apr 2016 @ 11301h 20m 3d 4h 4m
18 Apr 2016 @ 0726 ie4d 21h 8m
13 Apr 2016 @ 1018 ie wc16d 19h 14m
27 Mar 2016 @ 1504 ie wc10d 20h 4m
16 Mar 2016 @ 1900 ie wc12d 2h 3m
04 Mar 2016 @ 1557 ie wc26d 1h 9m
07 Feb 2016 @ 1448 ? ie wc1d 2h 34m

Interval Statistics

Interval Count100
Min2h 9m
Max4y 169d 5h 41m
Mean21d 2h 36m
Median2d 22h 37m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
600 03 Jan 2012 @ 1400 --- BoekelUpload 1400 appeared post-eruptive
675 19 May 2011 @ 2000 20 May 2011 @ 0800 BoekelUpload overnight based on water in overflow channel
671 22 Apr 2011 @ 2000 23 Apr 2011 @ 0800 BoekelUpload overnight
1035 04 Dec 2008 @ 0000 04 Dec 2008 @ 2359 BoekelUpload replaced marker
1009 08 Sep 2008 @ 0630 --- BoekelUpload before 06:30
1006 29 Aug 2008 @ 0605 --- BoekelUpload before 06:05
1000 15 Aug 2008 @ 0600 --- BoekelUpload marker washed before 06:00
984 25 Jul 2008 @ 0600 --- BoekelUpload marker washed before 06:00
1375 08 Jun 2007 @ 0815 --- BoekelUpload marker gone 08:15
1374 01 Jun 2007 @ 0000 01 Jun 2007 @ 0600 BoekelUpload before 06:00
1373 18 Jan 2007 @ 2000 19 Jan 2007 @ 0800 BoekelUpload overnight 1/18 - 1/19
1371 16 Jan 2007 @ 2000 17 Jan 2007 @ 0800 BoekelUpload overnight 1/16 - 1/17
1372 16 Jan 2007 @ 2000 17 Jan 2007 @ 0800 BoekelUpload overnight 1/16 - 1/17/2007
14370 29 Aug 1995 @ 1327 --- JarnoO false start; 5'
14314 01 Jun 1995 @ 0720 --- JarnoO marker in place
14312 31 May 1995 @ 2100 --- JarnoO mark placed
14303 08 May 1995 @ 1849 --- JarnoO immediately post-eruptive
12667 14 Jun 1994 @ 0000 14 Jun 1994 @ 0720 JarnoO between xx:xx & 0720
12627 15 Mar 1994 @ 1530 --- JarnoO marker in place
12622 10 Mar 1994 @ 1430 --- JarnoO still marked
12200 20 May 1993 @ 0000 20 May 1993 @ 2359 JarnoO mark present all day
5481 26 Jul 1992 @ 0000 26 Jul 1992 @ 2359 JarnoO steam phase ~1m [no time entered into the logbook]
5042 28 Feb 1992 @ 1931 --- JarnoO marked 1931
4983 18 Feb 1992 @ 1200 --- JarnoO marked this morning
277 03 Aug 1973 @ 0000 03 Aug 1973 @ 0545 BoekelUpload <05:45 erupt
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