| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 10924 |
27 Jan 2019 @ 0900 |
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Graham |
Colorful bacteris in the pool. |
| 3973 |
21 Apr 2017 @ 0741 |
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Micah Kipple |
Green water with orange streaks of bacteria. |
| 3203 |
22 Jun 2016 @ 1504 |
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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 |
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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. |