| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 18499 |
18 Jul 2021 @ 1305 |
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JarnoO |
(wc) Mugwump to Little Brother to north rim area is completely green and possibly lined with yellow at the edges - either way a pretty sight. Three Crater area and remainder of North Sister has a teal-ish color to it. Did not see the color of Middle and South Sisters. |
| 16387 |
10 Oct 2020 @ 1156 |
10 Oct 2020 @ 1200 |
JarnoO |
(wc) Two conewalkers. 1156:41 one of them came from between the North Sister-Basin Spring trees and headed out of frame (maybe for runoff pictures or Basin Spring itself). Back in frame 1157:00 and headed between the trees again. 1157:30 the other one headed straight for North Sister at Mugwump's side, with the other one joining 1½m later. It appears both were capturing "that one video". Both later headed behind a tree blocking direct view of the southern tip of North Sister. They later headed for safe ground @ 1159:48 and started running as well, with them reaching the road just 15 seconds later. |
| 16322 |
03 Oct 2020 @ 1424 |
03 Oct 2020 @ 1425 |
JarnoO |
(wc) Two conewalkers touched water twice of North Sister's pool at Mugwump's side. Were still at the pool's edge when the cam panned to Castle @ 1425, but gone by the time Mugwump had its 1431 eruption. |
| 15668 |
21 Aug 2020 @ 1545 |
21 Aug 2020 @ 1548 |
JarnoO |
(wc) Conewalking at Three Sisters in progress. Two people came within a mere foot or 15 (originally estim. 2-3, later revised based on satellite imagery) of North Sister, at Mugwump's side. Back on safe ground early 1548. |
| 7727 |
21 Oct 2017 @ 1315 |
21 Oct 2017 @ 1450 |
DanS |
No eruptions in Three Sisters group 1315-1450. |
| 7418 |
26 Sep 2017 @ 1253 |
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Tara |
Bacteria has returned to the Mugwump side of North Sister. Middle Sister remains active. |
| 5220 |
22 Aug 2017 @ 1040 |
22 Aug 2017 @ 1150 |
Tara |
Middle Sister is active today and was probably active prior to this based on observations from me, Rocco Paperiello, and David Schwarz, who saw one eruption on 8/21/17. Middle Sister eruptions consist of a single burst that may vary in height from 2 to 8 feet. Mugwump has been inactive for a number of days but is still hot. MYR-1 has been seen boiling but no eruptions have been reported. Three Crater is still frequent and sometimes having energetic eruptions to as much as 6-8 feet. |
| 4880 |
11 Aug 2017 @ 1220 |
11 Aug 2017 @ 1321 |
JSJ |
Overflow from North Sister's basin caused by splashing eruptions of Three Crater Geyser. Trickling overflow also occurs intermittently between eruptions through a border notch just north of Mugwump Geyser. |
| 4873 |
10 Aug 2017 @ 1710 |
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Tara |
Something is erupting in North Sister that was creating some overflow as of 8/8/17, though less runoff than when Mugwump was active in 2016. The bacteria in Mugwump was present at that time but is now gone. i have yet to catch the erupting feature so I am not sure if it is Mugwump, MYR-1, or something else. |
| 3496 |
14 Aug 2016 @ 1733 |
14 Aug 2016 @ 1751 |
JSJ |
Well-developed steamnado over the Three Sisters Spring complex at 1733. Another one at 1751. |
| 3005 |
07 Jun 2016 @ 1708 |
07 Jun 2016 @ 1711 |
JSJ |
Heavy pulsing event from North Sister Spring (= vent at 44°, 27' 37.08" North latitude, 110° 50' 12.71" West longitude) from 1908 to 1911. |
| 15178 |
23 Jan 1996 @ 0000 |
23 Jan 1996 @ 2359 |
JarnoO |
near full |
| 15177 |
22 Jan 1996 @ 0000 |
22 Jan 1996 @ 2359 |
JarnoO |
vents almost joined by pool |
| 14456 |
31 Dec 1995 @ 1200 |
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JarnoO |
not observed since 12/28; {generic time} |
| 497 |
06 Oct 1975 @ 0000 |
06 Oct 1975 @ 2359 |
BoekelUpload |
Three Sisters area springs;1st overflow since 6/30/75 Tremor |