Last Known Eruption
86d 18h 51m ago

Latest Eruptions

Eruption DurationInterval
29 Jul 2021 @ 1308 ie16d 18h 30m
12 Jul 2021 @ 1838 ie21d 2h 24m
21 Jun 2021 @ 1614<44m 15d 21h 18m
05 Jun 2021 @ 1856~54m 4y 260d 12h 10m
19 Sep 2016 @ 06467d 23h 4m
11 Sep 2016 @ 0742 ns18d 14h 46m
23 Aug 2016 @ 16568d 6h 57m
15 Aug 2016 @ 095912d 20h 56m
02 Aug 2016 @ 130328d 2h 35m
05 Jul 2016 @ 1028 ie2d 15h 24m
02 Jul 2016 @ 1904 ns1d 3h 26m
01 Jul 2016 @ 1538 ie2d 7h 14m
29 Jun 2016 @ 08245d 19h 40m
23 Jun 2016 @ 12441d 17h 8m
21 Jun 2016 @ 193611d 8h 2m
10 Jun 2016 @ 1134 min<30s 1d 21h 9m
08 Jun 2016 @ 1425 ie45d 19h 49m
23 Apr 2016 @ 1836~2m 182d 4h 21m
24 Oct 2015 @ 1415 ns7d 57m
17 Oct 2015 @ 13188d 1h 19m
09 Oct 2015 @ 115912m
09 Oct 2015 @ 11475d 43m
04 Oct 2015 @ 110419d 18h 14m
14 Sep 2015 @ 1650 ie14m
14 Sep 2015 @ 1636 ie1d 19h 38m
12 Sep 2015 @ 2058 ie6h 8m
12 Sep 2015 @ 14508h 8m
12 Sep 2015 @ 0642 ie3d 11h 5m
08 Sep 2015 @ 19374d 3h 14m
04 Sep 2015 @ 162318m
04 Sep 2015 @ 160517m
04 Sep 2015 @ 154814m
04 Sep 2015 @ 15343d 2h 12m
01 Sep 2015 @ 132257s 32m
01 Sep 2015 @ 12501d 21h 23m
30 Aug 2015 @ 152720h 28m
29 Aug 2015 @ 1859 ie45m
29 Aug 2015 @ 181416m
29 Aug 2015 @ 175813m
29 Aug 2015 @ 174546m
29 Aug 2015 @ 16594d 7h 8m
25 Aug 2015 @ 095118h 25m
24 Aug 2015 @ 15268d 4h 38m
16 Aug 2015 @ 1048 ie17h 42m
15 Aug 2015 @ 17062d 1h 2m
13 Aug 2015 @ 16042d 9h 7m
11 Aug 2015 @ 0657 ie3d 12h 25m
07 Aug 2015 @ 1832 ie1d 12h 50m
06 Aug 2015 @ 0542 ie3d 2h 44m
03 Aug 2015 @ 02581m 40s 13m
03 Aug 2015 @ 02451m 35s 13m
03 Aug 2015 @ 02322m 2s 10m
03 Aug 2015 @ 02227d 11h 3m
26 Jul 2015 @ 15193d 4h 44m
23 Jul 2015 @ 10352d 5h 11m
21 Jul 2015 @ 0524 ie5d 8h 48m
15 Jul 2015 @ 2036 ie7d 22h 53m
07 Jul 2015 @ 21432m 20m
07 Jul 2015 @ 21231m 50s 27m
07 Jul 2015 @ 20562m 17m
07 Jul 2015 @ 20391m 30s 18m
07 Jul 2015 @ 20211m 55m
07 Jul 2015 @ 19266m 20s 15m
07 Jul 2015 @ 19111m 20s 14m
07 Jul 2015 @ 18571m 10s 13m
07 Jul 2015 @ 18441m 14m
07 Jul 2015 @ 18301m 12m
07 Jul 2015 @ 181820s 15m
07 Jul 2015 @ 18031.5m 14m
07 Jul 2015 @ 1749 ini2m 5h 24m
07 Jul 2015 @ 12252h 56m
07 Jul 2015 @ 09294d 22h 38m
02 Jul 2015 @ 105124m
02 Jul 2015 @ 10272d 20h 29m
29 Jun 2015 @ 135816h 52m
28 Jun 2015 @ 21061h 30m
28 Jun 2015 @ 1936 ie3d 2h 41m
25 Jun 2015 @ 16553d 10h 27m
22 Jun 2015 @ 06286d 11h 0m
15 Jun 2015 @ 192818m
15 Jun 2015 @ 1910 ie10d 23h 12m
04 Jun 2015 @ 19581d 8h 12m
03 Jun 2015 @ 11467d 45m
27 May 2015 @ 110122h 16m
26 May 2015 @ 12451d 22h 57m
24 May 2015 @ 13487d 20h 55m
16 May 2015 @ 16531d 7m
15 May 2015 @ 1646~2m 34s 14m
15 May 2015 @ 163210m
15 May 2015 @ 162243s 11m
15 May 2015 @ 1611~33s 11m
15 May 2015 @ 160022m
15 May 2015 @ 15382h 14m
15 May 2015 @ 13241m 56s 29m
15 May 2015 @ 12551m 44s 19m
15 May 2015 @ 123618m
15 May 2015 @ 12182m 14s 14m
15 May 2015 @ 1204~1m 45s 13m
15 May 2015 @ 1151~1m 14m
15 May 2015 @ 1137>1m 9m

Interval Statistics

Interval Count100
Min9m
Max4y 260d 12h 10m
Mean22d 16h 5m
Median23h 11m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
19658 16 Sep 2021 @ 1006 --- Skookum Level about mid crater, water is milky and opaque.
18415 14 Jul 2021 @ 0706 --- SteveO Down about 18 inches.
18404 13 Jul 2021 @ 0637 --- SteveO Water level low and slight boiling.
18052 23 Jun 2021 @ 0758 --- Graham Up high.
18001 22 Jun 2021 @ 0826 --- Graham Water level is high.
17973 21 Jun 2021 @ 1559 --- K.Cooper Water continues to fall, now boiling
17976 21 Jun 2021 @ 1551 --- K.Cooper Quite low in the vent, levels below orange cyanobacteria
17868 17 Jun 2021 @ 1242 --- Craigmon99 Quite full, water connecting around outer islands. Occasional welling up of water and bubbling from a few cracks in the pool
17826 15 Jun 2021 @ 1345 --- Craigmon99 Has filled dramatically since last viewing. No where near true overflow but still quite full
17820 15 Jun 2021 @ 1316 --- Craigmon99 At what I would consider “average” level during my visits
10924 27 Jan 2019 @ 0900 --- Graham Colorful bacteris in the pool.
3973 21 Apr 2017 @ 0741 --- Micah Kipple Green water with orange streaks of bacteria.
3203 22 Jun 2016 @ 1504 --- David water at a very low level within conduit/vent. Slowly rose thru 15:27. see photo series: https://www.flickr.com/search/?user_id=93705139%40N00&sort=date-taken-desc&text=oval%20yellowstone&view_all=1
2234 01 Sep 2015 @ 1423 --- Micah Kipple Front Vent splashing, drained.
2157 14 Aug 2015 @ 1628 14 Aug 2015 @ 1843 JSJ Oval Spring ~one-third filled at 1628. Basin nearly full at 1800. Full pool pulsing event at 1815. Pool calm at 1817. A second full pool pulsing event at 1828. Calm at 1829. Water level down a bit as of 1838. Even lower at 1843.
1610 18 May 2015 @ 1739 18 May 2015 @ 1930 JSJ During a Tardy cycle: whole crater observed to be water-filled at 1739. Full-pool pulsing at 1743-1744 and 1753-1754 and 1803-1804 and 1813-1814 and 1823 (2 more pulsing events were witnessed by others before these). The latter pulsing events resulted in slight overflow from 3 sites along the edge of Oval Spring's geyserite sediment border rim (1: NW side; 2: ESE side; 3: SW side). Observed Oval's water level was way down at 1930, after the end of Penta Geyser's 1827 to 1923 eruption.
No attachments for this geyser.
Baseline does not exist.