Last Known Eruption
13h 7m ago

Latest Eruptions

Eruption DurationInterval
14 Aug 2025 @ 17118m
14 Aug 2025 @ 1703~2m 6h 11m
14 Aug 2025 @ 1052 maj5h 17m
14 Aug 2025 @ 0535 ie maj>5h 2m 18h 8m
13 Aug 2025 @ 1127 maj5h 57m
13 Aug 2025 @ 0530 ie maj>5h 26m 1d 17h 10m
11 Aug 2025 @ 122010m
11 Aug 2025 @ 1210~4m 5h 46m
11 Aug 2025 @ 0624 maj23h 16m
10 Aug 2025 @ 0708 maj2h 3m
10 Aug 2025 @ 0505 ie maj>1h 34m 13h 33m
09 Aug 2025 @ 1532 ie maj9h 12m
09 Aug 2025 @ 0620 maj13h 4m
08 Aug 2025 @ 171613m
08 Aug 2025 @ 1703~4m 8h 49m
08 Aug 2025 @ 0814 maj2h 54m
08 Aug 2025 @ 0520 ie>2h 36m 17h 31m
07 Aug 2025 @ 1149 maj22h 37m
06 Aug 2025 @ 1312 maj4h 56m
06 Aug 2025 @ 0816 maj4h 37m 2h 41m
06 Aug 2025 @ 0535 ie maj>2h 34m 19h 47m
05 Aug 2025 @ 0948 maj5h 6m 3h 54m
05 Aug 2025 @ 0554 maj3h 37m 54m
05 Aug 2025 @ 0500 ie maj>40m 13h 55m
04 Aug 2025 @ 1505 maj6h 23m
04 Aug 2025 @ 0842 maj5h 37m 3h 42m
04 Aug 2025 @ 0500 ie maj>3h 35m 13h 0m
03 Aug 2025 @ 1600 maj5h 24m
03 Aug 2025 @ 1036 maj5h 15m 5h 21m
03 Aug 2025 @ 0515 ie maj>3h 56m 14h 6m
02 Aug 2025 @ 1509 maj4h 17m
02 Aug 2025 @ 1052 maj4h 7m 4h 17m
02 Aug 2025 @ 0635 maj4h 12m 2d 10h 46m
30 Jul 2025 @ 1949 maj2m
30 Jul 2025 @ 19472d 12h 2m
28 Jul 2025 @ 0745 ie1d 0m
27 Jul 2025 @ 0745 ie18h 54m
26 Jul 2025 @ 1251 maj4h 38m 4h 30m
26 Jul 2025 @ 0821 maj4h 11m 3h 6m
26 Jul 2025 @ 0515 ie maj>2h 51m 17h 48m
25 Jul 2025 @ 1127 maj4h 43m 6h 22m
25 Jul 2025 @ 0505 ie maj>2h 59m 15h 27m
24 Jul 2025 @ 1338 maj8h 28m
24 Jul 2025 @ 0510 ie>4h 24m 14h 3m
23 Jul 2025 @ 1507 maj8h 14m
23 Jul 2025 @ 0653 maj8h 8m 1d 1h 53m
22 Jul 2025 @ 0500 ie maj8h 55m
21 Jul 2025 @ 2005 maj8h 33m
21 Jul 2025 @ 1132 maj2d 23h 27m
18 Jul 2025 @ 1205 maj1d 22h 35m
16 Jul 2025 @ 1330 maj52m
16 Jul 2025 @ 1238 ie4h 37m
16 Jul 2025 @ 0801 maj5h 12m 19h 14m
15 Jul 2025 @ 1247 maj4h 39m
15 Jul 2025 @ 0808 maj4h 29m 3h 15m
15 Jul 2025 @ 0453 ie maj>2h 47m 15h 16m
14 Jul 2025 @ 1337 maj7h 34m
14 Jul 2025 @ 0603 ie maj>7h 29m 13h 29m
13 Jul 2025 @ 1634 maj8h 41m
13 Jul 2025 @ 0753 ie3h 13m
13 Jul 2025 @ 0440 ie maj>11h 23m 15h 3m
12 Jul 2025 @ 1337 maj3h 30m
12 Jul 2025 @ 1007 maj4h 33m
12 Jul 2025 @ 0534 maj4h 16m 29m
12 Jul 2025 @ 0505 ie min12h 59m
11 Jul 2025 @ 1606 maj5h 12m
11 Jul 2025 @ 1054 maj4h 54m 2d 22h 38m
08 Jul 2025 @ 1216 maj56m
08 Jul 2025 @ 1120 ie maj5h 45m
08 Jul 2025 @ 0535 ie13h 34m
07 Jul 2025 @ 1601 maj7h 51m
07 Jul 2025 @ 0810 ie maj2d 16h 35m
04 Jul 2025 @ 1535 ie23h 22m
03 Jul 2025 @ 1613 maj1h 55m
03 Jul 2025 @ 1418 ie maj1d 6h 21m
02 Jul 2025 @ 0757 ie maj2d 19h 21m
29 Jun 2025 @ 1236 maj5h 4m
29 Jun 2025 @ 0732 ie1d 3m
28 Jun 2025 @ 0729 ie6d 15h 29m
21 Jun 2025 @ 1600 maj1d 8h 7m
20 Jun 2025 @ 0753 ie1d 8m
19 Jun 2025 @ 0745 ie2d 3m
17 Jun 2025 @ 0742 ie23h 17m
16 Jun 2025 @ 0825 ie4d 12h 40m
11 Jun 2025 @ 1945 maj12h 53m
11 Jun 2025 @ 0652 maj11h 3m
10 Jun 2025 @ 1949 ini maj3h 37m
10 Jun 2025 @ 1612 ie7h 55m
10 Jun 2025 @ 0817 ie3h 17m
10 Jun 2025 @ 0500 ie9h 43m
09 Jun 2025 @ 1917 maj8m
09 Jun 2025 @ 190910h 54m
09 Jun 2025 @ 0815 ie2h 47m
09 Jun 2025 @ 0528 ie16h 29m
08 Jun 2025 @ 1259 ie20h 20m
07 Jun 2025 @ 1639 maj11m
07 Jun 2025 @ 1628 min4h 57m
07 Jun 2025 @ 1131 maj4h 28m
07 Jun 2025 @ 0703 maj11m
07 Jun 2025 @ 0652 min15h 3m

Interval Statistics

Interval Count100
Min2m
Max6d 15h 29m
Mean16h 34m
Median8h 37m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
41081 14 Aug 2025 @ 1705 --- JSJ Start of post-Fountain pause # 2. Pause # 2 from late 1705 to 1711 (d = ~6m). Trying to turn on at late 1710 to 1711.
41080 14 Aug 2025 @ 1655 --- JSJ Clepysdra turned off. 6h03m duration eruption - 1052 to 1655. Start of post-Fountain pause # 1. Pause # 1 from 1655 to 1703 (d = ~8m). Trying to turn on at 1702. New eruption started at 1703.
41016 11 Aug 2025 @ 1214 11 Aug 2025 @ 1220 JSJ Pause # 2. Trying to turn on at 1218 and 1219.
41014 11 Aug 2025 @ 1204 11 Aug 2025 @ 1210 JSJ Eruption done. Start of pause # 1 after Fountain Geyser's 1117 eruption. Eruption duration was 5h40m. Pause # 1 = 1204 to 1210. Trying to turn on at 1208 to 1210.
40973 11 Aug 2025 @ 0615 --- LynnS Clepsydra is in a pause.
40928 09 Aug 2025 @ 0615 --- LynnS In a pause
40915 08 Aug 2025 @ 1745 --- Tara on strong as seen from road
40918 08 Aug 2025 @ 1707 --- JSJ Start of pause # 2 after Fountain Geyser's 1616 to 1642 eruption.
40917 08 Aug 2025 @ 1655 --- JSJ Clepsydra off - 8h41m long eruption. Beginning of pause # 1 after Fountain Geyser's 1616 to 1642 eruption.
40887 07 Aug 2025 @ 0620 07 Aug 2025 @ 1149 LynnS Clepsydra in extended pause mode. Fountain erupted from an aborted stall. I don’t know when Clepsydra entered pause mode. Clepsydra turned off at 0720, was off when Fountain started at 0724, was ie at 0729, was observed off at 0736. Clepsydra remained during the rest of Fountain’s eruption. Clepsydra did not resume continuous eruptive activity with all vents participating until 1149.
40810 05 Aug 2025 @ 1454 05 Aug 2025 @ 1549 LynnS During this time Clepsydra had four pauses. I left the area when it entered the fifth pause at 1549.
40754 02 Aug 2025 @ 0510 02 Aug 2025 @ 0634 LynnS Clepsydra in pause mode. Time of Previous Fountain eruption and time Clepsydra had its first pause are unknown.
40738 01 Aug 2025 @ 2200 --- K.Cooper Off - Watched it for a few mins from the road and it did not turn on
40685 28 Jul 2025 @ 1412 --- anicolov in eruption, not sure if a continuation of morning observation
40606 25 Jul 2025 @ 1600 25 Jul 2025 @ 1640 deanl no pause until 1610, on again 1619, and on solid until I left at 1640
40578 24 Jul 2025 @ 1339 --- Scott H off; attempting restart as I drove by
40569 23 Jul 2025 @ 1500 23 Jul 2025 @ 1515 deanl 1st pause 1500. on again 1508. then steady
40572 23 Jul 2025 @ 0530 23 Jul 2025 @ 0650 LynnS Clepsydra in extended pause mode, turning on and off at 1-3 minute intervals, only one or two vents erupting
40560 22 Jul 2025 @ 1639 --- steve Clepsydra off 1639, on at 1644, off 1651, on at 1655, off 1703, on at 1707 and still off at 1717
40556 22 Jul 2025 @ 0742 22 Jul 2025 @ 0747 Polly Clepsydra was on full, then looked weaker.
40549 21 Jul 2025 @ 1934 --- Mikemcc Still pausing after fountains 15:23 eruption. Steady overflow from pool vent even when not erupting.
40540 21 Jul 2025 @ 1124 --- nails First pause after Fountain
40537 21 Jul 2025 @ 0905 21 Jul 2025 @ 1020 Tara on steady during this time
40531 21 Jul 2025 @ 0742 --- Polly On strong
40506 20 Jul 2025 @ 0845 --- JR In stall
40501 20 Jul 2025 @ 0758 --- Polly Clepsydra was on, then paused at this time.
40454 18 Jul 2025 @ 1157 --- Tara 1st pause after Fountain
40432 16 Jul 2025 @ 0505 16 Jul 2025 @ 0800 LynnS In pause mode
40416 15 Jul 2025 @ 0750 --- Polly Some steam, definitely not on full. Outside temp 52 degrees.
40334 11 Jul 2025 @ 0825 11 Jul 2025 @ 1054 LynnS In a pause, restarted 0830, continued having pauses until continuous activity resumed at 1054
40288 07 Jul 2025 @ 2130 --- K.Cooper Going into stall
40281 07 Jul 2025 @ 1046 --- deanl off about 1046, on 1053, off 1056, on 1102 and solid for >10m
40211 04 Jul 2025 @ 1344 --- K.Cooper off at 1311 and 1344
40162 30 Jun 2025 @ 0845 30 Jun 2025 @ 1115 Tara on steady for this period
40087 27 Jun 2025 @ 0900 --- Tara off at this time as seen from road
40000 22 Jun 2025 @ 0841 --- steve Off about 0841, on at 0847 but weak, off 0851, on 0857, still on at 0928 when I left
39976 21 Jun 2025 @ 0804 21 Jun 2025 @ 0806 Polly On, then appeared to pause in my short observation.
39981 20 Jun 2025 @ 1815 --- steve Clepsydra back on
39980 20 Jun 2025 @ 1808 --- steve Off again
39979 20 Jun 2025 @ 1806 --- steve Clepsydra back on
39978 20 Jun 2025 @ 1802 --- steve Clepsydra was off when I arrived
39940 20 Jun 2025 @ 1332 --- steve Clepsydra back on at 1332
39939 20 Jun 2025 @ 1329 --- steve Clepsydra is off. It stopped something the last 5 minutes.
40031 20 Jun 2025 @ 0900 --- Siegmund On strong
40026 19 Jun 2025 @ 0825 19 Jun 2025 @ 0930 Siegmund On strong at 0825. Quit 09:23:45 (2m40s after Fountain ended), first restart splash 0927:04.
39932 18 Jun 2025 @ 1754 --- steve Off 1754, on 1801, off 1805, on 1813,then on continuously until I left at 1845.
39921 18 Jun 2025 @ 1231 18 Jun 2025 @ 1347 steve Off at 1231, on 1238, off 1241, on 1247, and still ie at 1347
39916 17 Jun 2025 @ 2037 --- steve Clep off about 2037 to 2042, then about 2045 to 2051. Still on at 2120
39910 17 Jun 2025 @ 1530 --- Scott H Clep off; seen from road
40023 16 Jun 2025 @ 2100 16 Jun 2025 @ 2110 Siegmund On steady and strong.
39892 15 Jun 2025 @ 1802 --- Scott H attempting restart as I drove by
40013 15 Jun 2025 @ 1652 --- Siegmund Single widely separated bursts.
39880 15 Jun 2025 @ 0753 --- Polly On strong on my drive across the flats.
39875 14 Jun 2025 @ 1552 --- Tara shut off at this time as seen from the road.
39815 12 Jun 2025 @ 1419 --- mhreed Stop starting
39793 11 Jun 2025 @ 0645 --- Kyle pause post FTN
39790 10 Jun 2025 @ 1943 --- Kyle 1st and only pause post FTN
39785 09 Jun 2025 @ 1912 --- Kyle pause #2 post FTN
39784 09 Jun 2025 @ 1905 --- Kyle Clepsydra is paused. not in eruption. 1st post FTN pause
39724 07 Jun 2025 @ 1621 --- Mikemcc first pause
39723 07 Jun 2025 @ 1125 --- Mikemcc first pause
39716 07 Jun 2025 @ 0656 --- Kyle 2nd pause post FTN
39715 07 Jun 2025 @ 0646 --- Kyle 1st pause post FTN
39714 07 Jun 2025 @ 0541 --- Kyle on strong and steady
39709 06 Jun 2025 @ 1543 --- Kyle 2nd pause post FTN
39708 06 Jun 2025 @ 1532 --- Kyle 1st pause post FTN
39702 06 Jun 2025 @ 0613 --- Kyle 2nd pause post FTN
39701 06 Jun 2025 @ 0603 --- Kyle 1st pause post FTN
39665 05 Jun 2025 @ 1715 --- Kyle 2nd pause post FTN
39664 05 Jun 2025 @ 1705 --- Kyle pause after FTN
39615 01 Jun 2025 @ 1120 01 Jun 2025 @ 1138 Kyle Clepsydra appears to be on steady and strong viewed from road. FPP parking is a bit of a mess
39432 28 May 2025 @ 0858 --- mhreed Not in eruption.
39428 28 May 2025 @ 0735 --- SteveO Paused at 0735
39384 26 May 2025 @ 1927 26 May 2025 @ 1957 Stephen_Gemar Clepsydra had three pauses during this time. Left during the third pause.
39365 26 May 2025 @ 0748 --- TSBryan on without observed pauses
39343 25 May 2025 @ 0820 --- User34 On strong, side vent empty
39324 24 May 2025 @ 1503 --- LynnS Still in pause mode
39315 24 May 2025 @ 1422 --- Tara shut off for 5th pause, Spasm and Jelly coming up. looks like a stall
39266 22 May 2025 @ 1622 22 May 2025 @ 1631 LynnS Was not in eruption when Fountain started at 1630ns and remained off during Fountain’s eruption
39265 22 May 2025 @ 1613 22 May 2025 @ 1616 LynnS In a pause
39257 22 May 2025 @ 1346 --- Darcie Clep’s pausing
39251 22 May 2025 @ 0928 --- mhreed Off at this time.
39198 21 May 2025 @ 0543 21 May 2025 @ 0628 LynnS In pause mode.
39167 19 May 2025 @ 0810 --- mhreed Sputter starting.
39153 18 May 2025 @ 0901 18 May 2025 @ 0942 Graham Paused during and after Fountain in an aborted stall.
39152 18 May 2025 @ 0721 18 May 2025 @ 0811 Graham Sloppy play/Coughing. Lots of front vent bursting and occasional other vents. Not pausing for long enough to log.
39149 18 May 2025 @ 0643 --- Graham Paused. In a stall seen from parking lot.
39127 17 May 2025 @ 1348 --- Graham Paused 31m after Fountain quit
39121 17 May 2025 @ 0728 --- Graham Paused 22m after Fountain quit
39099 16 May 2025 @ 1947 --- Ajw Shut off 14m after Fountain ended
39102 16 May 2025 @ 1945 --- Graham Paused 12m after Fountain quit
39095 16 May 2025 @ 1423 --- Graham Paused 13m after Fountain
39087 16 May 2025 @ 0915 --- Graham Paused 11m after Fountain quit
39080 15 May 2025 @ 1818 --- Graham Paused 14m after Fountain quit
39066 15 May 2025 @ 1309 --- Graham Paused 12m after Fountain quit
39061 15 May 2025 @ 0811 --- Graham Paused 15m after Fountain quit
39054 14 May 2025 @ 1712 --- Graham Paused 13m after Fountain
39047 14 May 2025 @ 1250 --- Graham Paused 21m after Fountain quit
39050 14 May 2025 @ 0613 14 May 2025 @ 0828 LynnS In pause mode, when erupting, only one vent is active. Initial observation from the road, subsequent observations from Great Fountain, steam clouds disappearing and reappearing
39042 14 May 2025 @ 0651 --- Graham Paused. Already pausing 0613 per Lynn.
EntrySourceLinkComment
03 Jun 2017 @ 1100 JSJ https://www.flickr.com/photos/jsjgeology/35373533035 Photo of Clepsydra Geyser erupting during the late morning of 3 June 2017.
Baseline does not exist.