| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 21691 |
03 Jun 2022 @ 1216 |
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ge |
2 ft below crest |
| 21264 |
13 May 2022 @ 1500 |
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Tara |
Bluish water, water level down ~2.5 feet. |
| 19715 |
24 Sep 2021 @ 0757 |
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SteveO |
Down about 2 feet below the rim. |
| 19269 |
04 Sep 2021 @ 0926 |
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Janet Jones |
Below overflow. Steam rising 6-10 feet above ground level at 46 degrees F. |
| 17938 |
20 Jun 2021 @ 0716 |
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K.Cooper |
2 feet below rim, surface temp about 120F |
| 17604 |
09 Jun 2021 @ 1400 |
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Tara |
Water level still down, temp still cool with darker bacteria in the pool. |
| 16462 |
28 Oct 2020 @ 1129 |
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Janet Jones |
Green with a hint of blue to the green. Yellow microbes in the little catch basin by the main overflow channel and shallow ledge. |
| 16431 |
15 Oct 2020 @ 1412 |
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jonp |
Clear blue-green color; slight overflow. |
| 15363 |
04 Aug 2020 @ 1130 |
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Janet Jones |
Clear blue - vent is very visible at the bottom. Steady bubbles rising in one spot along the edge closest to the boardwalk that runs along the long side of the pool. |
| 14991 |
15 Jul 2020 @ 1035 |
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Janet Jones |
Back to clear and blue-green color - vent is clearly visible and it’s overflowing. Rangers Julie, Luz and Carley said it cleared up about three weeks ago. Bubbles were seen rising along the edge, but none seen from the center of the pool. |
| 14780 |
29 Jun 2020 @ 1344 |
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bhoppe |
Pool was full and blue. Overflowing in multiple spots with some bubbles rising to the surface near the boardwalk. |
| 14779 |
29 Jun 2020 @ 1030 |
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User34 |
Blue and hot. Ranger said it had heated to 170F in the course of a couple weeks |
| 14207 |
18 May 2020 @ 1318 |
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Janet Jones |
A couple of inches below overflow. Dark green - looks possibly muddy from ephemeral spring up top (across from "Fake Fumarole" - behind the old road) that flows into it every since the boardwalk was replaced. Is that mud plugging it up? |
| 20796 |
16 May 2020 @ 1543 |
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Janet Jones |
Not in overflow - as seen from a flight over the park. Time per camera data (not 100% sure that it's correct). |
| 13342 |
21 Aug 2019 @ 1130 |
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Janet Jones |
Yellow microbes lining the crater now have a mottled appearance. Color of the pool is now a lighter green than on my last visit earlier this month. |
| 12506 |
16 Jul 2019 @ 1045 |
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Janet Jones |
Green with a few chunks of microbe mat lifting. Vent is visible. |
| 11206 |
10 May 2019 @ 1304 |
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Janet Jones |
Orange microbes lining the crater. Zero bubbles seen. |
| 9155 |
12 Jul 2018 @ 1310 |
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bhoppe |
Pool has assumed a green-blue hue. Very clear to see deep into the pool. |
| 7713 |
15 Oct 2017 @ 1620 |
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Janet Jones |
Definitely has cooled. Definitely more green than blue. Still can clearly see the bottom of the crater. |
| 4286 |
09 Jun 2017 @ 1030 |
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Janet Jones |
Boardwalk being moved there, but you can still walk the outer loop of boardwalk at West Thumb. Abyss looked a touch more blue than on the 4th - still more of a teal color. Bubbles occasionally rising in a few spots. |
| 3876 |
13 Oct 2016 @ 1044 |
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Janet Jones |
While it's still a dark green, it is nice to see bubbles rising at one point along the edge closest to the main boardwalk loop. Also a few bubbles rose in the middle of the pool. |
| 3614 |
11 Jun 1992 @ 0800 |
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bhoppe |
Time or details not noted, but 6/11/1992 is noted as the "last known eruption" of Abyss Pool. |