| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 36746 |
04 Sep 2024 @ 1415 |
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kc |
4 ft. boil |
| 36744 |
04 Sep 2024 @ 1322 |
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kc |
Nice thumps and boils! |
| 36544 |
25 Aug 2024 @ 1140 |
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BrianR |
Only one weak thumping episode with a weak boil in the 15 minutes of observation. There is a 2ft log floating in the pool |
| 35181 |
13 Jun 2024 @ 1547 |
--- |
CrisG |
thumps again at 1551 |
| 33117 |
19 Dec 2023 @ 1507 |
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mhreed |
Activity appears unchanged. Clusters of thumps at variable intervals (on the order of minutes) and variable strength. |
| 28212 |
11 Sep 2023 @ 1104 |
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Pholli |
black sand pool had an eruption of ~5ft following a very large thump! |
| 26906 |
08 Jul 2023 @ 1450 |
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nails |
Thumping |
| 26877 |
07 Jul 2023 @ 0847 |
--- |
nails |
Thumping |
| 26343 |
15 Jun 2023 @ 1554 |
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CrisG |
thumping |
| 26193 |
09 Jun 2023 @ 1423 |
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CrisG |
thumping |
| 23711 |
10 Sep 2022 @ 1549 |
10 Sep 2022 @ 1603 |
ThomasR |
Strong thumps at 1550 and 1600 with large boiling up to approx. 1 foot. Smaller boils with weak thumps in between. |
| 19427 |
10 Sep 2021 @ 1201 |
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CrisG |
thumping |
| 19062 |
25 Aug 2021 @ 1520 |
25 Aug 2021 @ 1550 |
BrianR |
5 good thumping episodes, one with 4 ft boil |
| 18437 |
15 Jul 2021 @ 1658 |
15 Jul 2021 @ 1708 |
nails |
Thumping. |
| 18136 |
25 Jun 2021 @ 1001 |
--- |
CrisG |
great thumping with nice boil at 1001 |
| 18166 |
25 Jun 2021 @ 1001 |
--- |
CrisG |
great thumping with nice boil at 1001 |
| 16207 |
20 Sep 2020 @ 1743 |
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DanS |
Thumps and vigorous multipoint boils |
| 16151 |
17 Sep 2020 @ 1037 |
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kc |
7 ft burst in the middle of Pool. No thumps prior. |
| 16111 |
13 Sep 2020 @ 1610 |
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Graham |
Watched for 15m and no noisy thumps. Could feel some vibration on the railing. Sinter rim is dry indicating no high water. |
| 14979 |
14 Jul 2020 @ 1033 |
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nails |
Thumping |
| 14098 |
23 Jan 2020 @ 1144 |
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Graham |
Big thumps 1144, 1150, 1151, 1157 with big boil. |
| 11477 |
01 Jun 2019 @ 1432 |
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kc |
Almost entire pool burst violently to about 7 feet. Several big chunks of edge broke off. Total surprise. Thump happened as it was calming. |
| 11388 |
27 May 2019 @ 1515 |
27 May 2019 @ 1549 |
StephH |
Good thumps and bubbles every four to seven minutes. |
| 10796 |
25 Dec 2018 @ 1500 |
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Janet Jones |
Visitor report that mild thumps were happening every 3-5 minutes. |
| 10005 |
03 Sep 2018 @ 1230 |
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BobInSLC |
6-8 foot boil, after 45 minutes of waiting. thumping every 4 minutes or so. |
| 8410 |
02 Jun 2018 @ 1026 |
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kc |
Wide boil over 12 feet. Broke off multiple big chunks of edge. Was preceded by a mild thump. |
| 8407 |
02 Jun 2018 @ 0720 |
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steve |
Black sand pool is less active. I observed it from 0720 to 0752. I had no thumps until 0737 when I had 3 thumps followed by a boil. Just after that was one thump followedby a stronger boil. At 0745 there was one thump and a boil. At 0747 was a thump with no boil. At 0750 was a strong boil without a thump. Then at 0751 was a strong thump with no boil. |
| 4053 |
06 May 2017 @ 0957 |
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sfavor |
intermittent boiling. very nice shade of blue today. |
| 2786 |
24 Apr 2016 @ 1448 |
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User34 |
Thumps and heavy boiling |
| 2747 |
17 Apr 2016 @ 1145 |
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mhreed |
Thump cycles every 1-8 minutes, with one exceptionally loud cycle causing boiling to 2+ feet. |
| 2166 |
20 Aug 2015 @ 1013 |
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Choward |
There was a tree trunk floating in the pool. thumps every 2-3 minutes. |
| 1188 |
08 Jul 2014 @ 1200 |
08 Jul 2014 @ 1800 |
JSJ |
Black Sand Pool is still having relatively frequent subterranean thumping, followed by moderately small to moderately large roiling in Black Sand Pool - observed mid-afternoon on 8 July 2014. |
| 1067 |
11 May 2014 @ 0000 |
11 May 2014 @ 2359 |
WillBoekel |
Still nicely thumping :) |
| 1217 |
02 Jun 2013 @ 0000 |
02 Jun 2013 @ 2359 |
JSJ |
Black Sand Pool - moderately frequent subterranean thumping. Each thumping event was followed by energetic roiling-boiling at the surface of the pool, lasting for about 15 seconds or so. |
| 15829 |
31 May 1997 @ 0827 |
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JarnoO |
murky H2O; visibility ≤1ft |