Last Known Eruption
14d 20h 27m ago

Latest Eruptions

Eruption DurationInterval
01 Apr 2024 @ 2011 ie wc min16d 11h 5m
16 Mar 2024 @ 0906 ie wc min15d 23h 42m
29 Feb 2024 @ 0824 wc min11m 9d 19h 13m
19 Feb 2024 @ 1311 ie min1d 20h 4m
17 Feb 2024 @ 1707 wc min8d 1h 53m
09 Feb 2024 @ 1514 ie wc min2d 6h 25m
07 Feb 2024 @ 0849 ie wc min24m < d < 27m10d 1h 28m
28 Jan 2024 @ 0721 wc min~20m 3d 22h 29m
24 Jan 2024 @ 0852 ie wc5d 21h 9m
18 Jan 2024 @ 1143 min1d 2h 34m
17 Jan 2024 @ 0909 min5d 17h 56m
11 Jan 2024 @ 1513 ie min1d 2h 26m
10 Jan 2024 @ 1247 min34d 23h 23m
06 Dec 2023 @ 1324 ns wc min4d 3h 20m
02 Dec 2023 @ 1004 wc min~23m 4d 18h 17m
27 Nov 2023 @ 1547 wc min16d 5h 26m
11 Nov 2023 @ 1021 ie wc min5d 2h 29m
06 Nov 2023 @ 0752 wc min4d 22h 9m
01 Nov 2023 @ 1043 wc min9m 3d 17h 56m
28 Oct 2023 @ 1647 wc min~25m 3d 7h 57m
25 Oct 2023 @ 0850 wc min23-24m8d 15h 22m
16 Oct 2023 @ 1728 wc min5d 4h 5m
11 Oct 2023 @ 1323 ns min25m 8d 4h 56m
03 Oct 2023 @ 0827 ie wc min3d 13h 12m
29 Sep 2023 @ 1915 min19m 2d 4h 55m
27 Sep 2023 @ 1420 min20m 3d 22h 18m
23 Sep 2023 @ 1602 ie min19h 28m
22 Sep 2023 @ 2034 ie min8d 5h 13m
14 Sep 2023 @ 1521 ie min1d 21h 28m
12 Sep 2023 @ 1753 min14m 9h 31m
12 Sep 2023 @ 0822 ie min19h 33m
11 Sep 2023 @ 1249 min14m 2d 22h 5m
08 Sep 2023 @ 1444 min19m 2d 53m
06 Sep 2023 @ 1351 ie min1d 21h 48m
04 Sep 2023 @ 1603 min12m 5d 22h 8m
29 Aug 2023 @ 1755 ie min10d 20h 15m
18 Aug 2023 @ 2140 ie min17d 5h 21m
01 Aug 2023 @ 1619 wc min10m 7d 2h 19m
25 Jul 2023 @ 1400 min22m 46d 21h 20m
08 Jun 2023 @ 1640 min22m 18d 0m
21 May 2023 @ 1640 min8m 4d 14m
17 May 2023 @ 1626 min21m 77d 6h 56m
01 Mar 2023 @ 0830 ie wc min15d 21h 0m
13 Feb 2023 @ 1130 ie wc28d 21h 0m
15 Jan 2023 @ 1430 ? A min14h 30m
15 Jan 2023 @ 0000 A min6d 0m
09 Jan 2023 @ 0000 A min6d 10h 20m
02 Jan 2023 @ 1340 ie min22h 14m
01 Jan 2023 @ 1526 ns wc min8d 11m
24 Dec 2022 @ 1515 ns wc min8d 22h 3m
15 Dec 2022 @ 1712 wc min~10m 26d 1h 44m
19 Nov 2022 @ 1528 ie wc min17d 4h 3m
02 Nov 2022 @ 1225 ie wc min>8m 9d 21h 6m
23 Oct 2022 @ 1519 wc min4d 22h 43m
18 Oct 2022 @ 1636 ie wc>1h 10m 13d 4h 28m
05 Oct 2022 @ 1208 ie4d 18h 29m
30 Sep 2022 @ 1739 min8m 1d 9h 30m
29 Sep 2022 @ 0809 min11m 5d 16h 21m
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

Interval Statistics

Interval Count100
Min7h 27m
Max95d 1h 36m
Mean8d 6h 46m
Median4d 20h 19m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
33763 08 Jan 2024 @ 1258 --- Graham wet steam phase
31400 26 Nov 2023 @ 1607 26 Nov 2023 @ 1710 JarnoO (wc) Intermittent steaming which began while Sawmill was still ie from 1219. Continued during Sawmill's 1630 eruption and appeared to be done at 1710.
29211 29 Oct 2023 @ 1300 --- am Penta huffing steam…everything in Sawmill complex low on water. Splashing heard in Spasmodic but none seen. Dry and steamy. Sawmill empty
28804 15 Oct 2023 @ 1035 --- SantaFe108 Filled quickly, front pools nearly connected in a minute or two with good thick splashes out main vent. Then IT started erupting...
28649 05 Oct 2023 @ 2118 --- Ben VL Steam phase eruption ie
28586 30 Sep 2023 @ 1640 --- Graham Weak steam phase eruption.
28465 25 Sep 2023 @ 1203 --- Graham ie steam phase
28387 21 Sep 2023 @ 1202 --- Graham Steam phase ie before Sawmill quit
28141 09 Sep 2023 @ 0950 --- Graham Steam phase eruption in progress.
28094 07 Sep 2023 @ 1544 --- Graham Steam phase eruption.
27021 12 Jul 2023 @ 1454 --- minissa 15 minutes into Sawmill, Penta still has water, and the right hand "pool" vent is putting out water as if it's trying to erupt {from partially filled pool.}
26981 10 Jul 2023 @ 0010 --- Ben VL Splashing and pooling in the front vents. Sawmill just started a moment ago. Figure there was a setup for an eruption before Sawmill ruined it.
26415 17 Jun 2023 @ 1959 --- Craigmon99 First water seen in largest vent and lower vents
26290 13 Jun 2023 @ 1334 --- Graham Pooling water and bubbling in the vents. Then Sawmill started.
26282 13 Jun 2023 @ 0957 --- Graham Pooling water. 0958 dropping as Spasmodic drops.
26117 07 Jun 2023 @ 0810 --- Ben VL Water pooling in the front vents, pools merged at 0811. Dropped after spasmodic quit. Not as strong as what we got yesterday.
26097 06 Jun 2023 @ 2016 --- Graham Pooling water high in the vents again. Good thick splashes from main vent and then Sawmill started.
26092 06 Jun 2023 @ 1836 --- Graham Pooling water after 6+ h with no long Sawmill eruption. 1848 pools intermittently merged. 1853 dropped as Spasmodic quit.
25897 29 May 2023 @ 1846 --- Graham Pooling water rising. Spasmodic ie and rising. Oval rising. Sawmill off.1851 Spasmodic quit and Penta dropping.
25707 22 May 2023 @ 1745 --- SantaFe108 During two episode minutes apart, water rose in front vents till connecting and blooping. Main vent surged 1 foot or so and put thick runoff out the side of the cone. Sawmill turned on and killed it.
25581 20 May 2023 @ 1224 --- Brando Gurgling deep within, occasionally spitting water out of the main vent.
25456 15 May 2023 @ 2014 --- Graham Pooling water with some strong convection.
25322 04 May 2023 @ 2021 --- Ajw Frequent splashing from Penta's cone for over 4m..
25287 30 Apr 2023 @ 1322 --- SantaFe108 Water level has regressed to out-of-sight. Barely throwing droplets out of the cone.
25284 30 Apr 2023 @ 1308 --- SantaFe108 Splashing out of the front and main vents. About 12" above the cone.
25258 28 Apr 2023 @ 0924 --- mhvogel Small splashing in main vent. Vent closest to boardwalk full with small splashes
25217 23 Apr 2023 @ 1014 --- aferrara water pooling and undulating in three vents
24918 16 Jan 2023 @ 1053 --- Graham Pooling water low in the vent. Dropped after Sawmill started. Came back up, almost filling front vents. Dropped and very splashy after Spasmodic quit ~1220. Splashy went to steamy eruption 1235.
24908 15 Jan 2023 @ 1118 --- Graham Strong steam phase.
24895 14 Jan 2023 @ 0917 --- Graham Starting to pool water low in the vent again. 0948 water still rising after Sawmill started. Water levels dropped, still pooling deep in right vent.
24892 14 Jan 2023 @ 0805 --- Graham Pooling water low in the vents. Dropped 0819 and splashy.
24850 08 Jan 2023 @ 1659 --- Graham Steam phase eruption. D>20m
24426 16 Oct 2022 @ 1749 --- SantaFe108 Start of steam phase eruption. 12 minutes after Sawmill quit and 37 minutes after Spasmodic quit. Sawmill continued 25 minutes after Spasmodic shut off and Penta did not enter mixed phase.
24354 13 Oct 2022 @ 1336 --- Tara steam phase eruption ie
24236 05 Oct 2022 @ 1212 --- Tara steam phase eruption in progress
24177 01 Oct 2022 @ 0818 --- Graham Steam phase ie.
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.
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