| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 36999 |
15 Sep 2024 @ 1357 |
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Janet Jones |
"Waterfall" has water visible in the crater from the boardwalk - first in quite some time. |
| 14833 |
30 Jun 2020 @ 1300 |
30 Jun 2020 @ 1710 |
steve |
Then I arrived the whole basin of Warerfall geyser was wet with the exception of the rocks in the runoff channel to Thumb Geyser. As I watched I noticed the water was rising about 3-4 cm per hour. I kept watching it until a few minutes before 1700 when I made a quick run to the parking lot. At that time the water was still a couple of centimeters below overflow. After returning from the parking lot at 1710 the pool had dropped to about the level I originally saw it at. However the run off channel to Thumb Geyer was still dry. So something happened, I just don’t know what. While I was there UNNG-WTL-4 “Dancing Geyser” filled just before I noticed it at 1440 with two bubbling vents to 1 inch or so, then it drained prior to 1454. Besides that I never saw water in it for the observation period. UNNG-WTL-5 was very active. I was not sure if it was having short intervals of less than a minute or if it was perpetual but only occasionally above ground where I could see it. See also Ben Hoppe’s report from the 29th |
| 14783 |
29 Jun 2020 @ 1349 |
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bhoppe |
Water color is a milky white. Multiple feet below overflow, but the rim around it looked somewhat washed as if the water level had been higher somewhat recently. Thumb Geyser had a milky-blue color to it and was multiple feet below. |
| 13341 |
21 Aug 2019 @ 1125 |
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Janet Jones |
“Waterfall Geyser” has good water, bubbles and is starting to lose chunks if the microbe mat. |
| 13081 |
06 Aug 2019 @ 1130 |
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Janet Jones |
Hoping this number is for “Waterfall Geyser” - It’s bubbling along with Thumb Geyser and many others in the Thumb/Waterfall area. Water level is still well below “full” for this thermal feature, but it’s visible from the boardwalk. Crater is lined with brown microbes, but looks lighter in color than on my last visit a couple or three weeks ago. There’s also a small geyser between Thumb Geyser and Three Lobed Spring that’s been active often in the past that’s more energetically active than I’ve seen in a few years - splashes reach about a foot above ground at times. |
| 7432 |
26 Sep 2017 @ 1140 |
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Janet Jones |
Empty crater. Water level in Thumb Geyser and UTF Next to Thumb Geyser lower than the orange bacteria lining crater - foam in Thumb Geyser on the side nearest to "Waterfall Geyser." |
| 5383 |
25 Aug 2017 @ 2000 |
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Tara |
Water level down into the funnel and very quiet. Bubbler in side still active. Water level in Thumb is way up, about 3 inches below WTL-3's rim. |
| 4775 |
02 Aug 2017 @ 1341 |
02 Aug 2017 @ 1518 |
JSJ |
No Waterfall Geyser eruptions. Pool's water level was fairly low. Couldn't see up-close due to boardwalk closure & construction. |
| 4538 |
25 Jul 2017 @ 1833 |
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JSJ |
"Waterfall Geyser" (= "North of Thumb Geyser"). Pool's water level fairly low. |
| 4341 |
20 Jun 2017 @ 1000 |
20 Jun 2017 @ 1225 |
Tara |
Calm pool with occasional lazy bubbles, pool level rose slightly during this time to about the level of the bubbler within the basin. |
| 4308 |
13 Jun 2017 @ 1325 |
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Janet Jones |
Water levels were higher in "Waterfall Geyser" - enough to cover the first pool behind it (toward the parking lot) and water levels down in Thumb Geyser and the UTF next to Thumb Geyser. Waited until 1400 in the snow and wind until I gave it up for another day. |
| 4202 |
04 Jun 2017 @ 1014 |
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Janet Jones |
Muddy and little bubbling seen in it or Thumb Geyser. Guessing it erupted overnight. |
| 4147 |
28 May 2017 @ 1503 |
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Janet Jones |
Steadier boiling in "Waterfall" than this morning. Also more boiling now in Thumb Geyser and the UTF next to it. |
| 4142 |
28 May 2017 @ 0944 |
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Janet Jones |
Blue with some bubbles rising - water level down a foot or so in Thumb Geyser. |
| 3744 |
04 Oct 2016 @ 0920 |
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bhoppe |
Based on melted snow in the runoff area, I would guess an eruption occurred sometime overnight or this morning before I arrived at the basin. |
| 3710 |
24 Sep 2016 @ 0942 |
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bhoppe |
Runoff channel quite wet. Hard to tell if water came from the sky or from the ground. |
| 3542 |
25 Aug 2016 @ 0928 |
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Janet Jones |
N.O.T. Empty but gurgling heard at depth. |