Last Known Eruption
3y 296d 6h 1m ago

Latest Eruptions

Eruption DurationInterval
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
06 Feb 2016 @ 1214 ie wc16d 12h 14m
21 Jan 2016 @ 0000 A2d 0m
19 Jan 2016 @ 0000 A1d 20h 0m
17 Jan 2016 @ 0400 A3d 19h 31m
13 Jan 2016 @ 0829 ie wc1d 17h 4m
11 Jan 2016 @ 1525 wc31d 4h 48m
11 Dec 2015 @ 1037 ? ie wc55d 21h 27m
16 Oct 2015 @ 1410 min2d 5h 12m
14 Oct 2015 @ 0858 min1h 31m
14 Oct 2015 @ 07271h 22m 1d 18h 47m
12 Oct 2015 @ 12401h 16m 12d 22h 44m
29 Sep 2015 @ 135616d 21h 28m
12 Sep 2015 @ 1627 E3m 1h 37m
12 Sep 2015 @ 1450 min1m 30s 9d 6h 6m
03 Sep 2015 @ 0844 ie wc15h 46m
02 Sep 2015 @ 16581h 1m 1d 3h 7m
01 Sep 2015 @ 1351 min2d 7h 4m
30 Aug 2015 @ 0647 maj~15m 11h 46m
29 Aug 2015 @ 1901 min27m 4d 8h 34m
25 Aug 2015 @ 1027 min8d 1h 24m
17 Aug 2015 @ 0903 min50m
17 Aug 2015 @ 0813 ie min19h 32m
16 Aug 2015 @ 1241 ie maj10d 7h 5m
06 Aug 2015 @ 0536 ns min5d 11h 5m

Interval Statistics

Interval Count100
Min50m
Max55d 21h 27m
Mean5d 5h 26m
Median2d 11h 27m

Latest Notes

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