| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 22131 |
26 Jun 2022 @ 0924 |
--- |
Tara |
Pool calm and overflowing. Side vents completely quiet, no steam. River is down a bit but the side channel is still full. |
| 21967 |
13 Jun 2022 @ 1040 |
--- |
Graham |
Platform vents ie. Pool low and calm as river rages by. |
| 21748 |
05 Jun 2022 @ 1158 |
--- |
SantaFe108 |
Pool is overflowing and calm, side vents to the left are lightly splashing to about about foot. River is flowing through the side channel aswell. |
| 21558 |
28 May 2022 @ 1545 |
--- |
Tara |
Firehole River is high enough that the side channel is full of brownish water. East Sentinel is flat and calm with steady overflow. The side vents were sloshing lazily to 1-2' for the few minutes I was there. |
| 21365 |
19 May 2022 @ 1449 |
--- |
Graham |
Pool calm with high water running down the channel by the bank. Small vents on the platform splashing to a foot or 2. |
| 21310 |
16 May 2022 @ 1118 |
--- |
Brando |
Pool is completely flat. 2 Bison across the river made it interesting. |
| 20804 |
12 Feb 2022 @ 0925 |
--- |
aferrara |
Full pool rolling boil |
| 20697 |
15 Jan 2022 @ 0957 |
--- |
Graham |
No evidence of recent eruptions. Grassy area is snow covered and some snow on the platform. Water level low and no boil during brief visit. |
| 20344 |
13 Nov 2021 @ 0844 |
--- |
Mkeller |
No boiling in overflow. |
| 20214 |
30 Oct 2021 @ 0928 |
--- |
Brando |
Flat pool with the occasional boil |
| 20163 |
28 Oct 2021 @ 1722 |
--- |
DanS |
More active than yesterday. Constantly bubbling but no boiling. |
| 20151 |
27 Oct 2021 @ 1455 |
27 Oct 2021 @ 1505 |
DanS |
No boils, just occasional light bubbling. |
| 20118 |
25 Oct 2021 @ 0827 |
--- |
Darcie |
No boil. (Or at 8:46) |
| 20067 |
20 Oct 2021 @ 1635 |
--- |
Tara |
right side boils |
| 20015 |
17 Oct 2021 @ 1158 |
--- |
Darcie |
Right side boil |
| 19977 |
14 Oct 2021 @ 1533 |
--- |
Tara |
right side boils |
| 19965 |
12 Oct 2021 @ 1034 |
--- |
aferrara |
Tall rolling boil, most energetic on the right but whole pool is boiling. |
| 19957 |
10 Oct 2021 @ 1909 |
--- |
Tara |
Right side boils |
| 19887 |
05 Oct 2021 @ 0812 |
--- |
Darcie |
Right side boil |
| 19880 |
04 Oct 2021 @ 0916 |
--- |
Darcie |
Boiling on the right |
| 19865 |
03 Oct 2021 @ 1128 |
--- |
Darcie |
Right side boil |
| 19799 |
30 Sep 2021 @ 0740 |
--- |
Graham |
Still right side boils. |
| 19778 |
29 Sep 2021 @ 0820 |
--- |
Graham |
Still right side boils. |
| 19766 |
28 Sep 2021 @ 0733 |
--- |
Graham |
Still right side boils. |
| 19755 |
27 Sep 2021 @ 0656 |
--- |
Graham |
Still right side boils. |
| 19735 |
26 Sep 2021 @ 0725 |
--- |
Graham |
Still right side boils. |
| 19724 |
25 Sep 2021 @ 0740 |
--- |
Graham |
Still right side boils. |
| 19689 |
22 Sep 2021 @ 1720 |
--- |
Tara |
right side boil |
| 19682 |
22 Sep 2021 @ 0755 |
--- |
Graham |
Still right side boils. |
| 19673 |
21 Sep 2021 @ 0750 |
--- |
Graham |
Still right side boils. |
| 19667 |
20 Sep 2021 @ 1604 |
--- |
Graham |
Still right side boils. Weaker activity than last week. Maybe due to higher river level following the rain and snow yesterday. |
| 19654 |
19 Sep 2021 @ 1525 |
19 Sep 2021 @ 1535 |
Mike C |
slight boiling on right small left side boiling in overflow |
| 19640 |
18 Sep 2021 @ 0738 |
--- |
Graham |
Still right side boils. |
| 19630 |
17 Sep 2021 @ 0657 |
--- |
Graham |
Still right side boils. |
| 19627 |
16 Sep 2021 @ 2014 |
--- |
Tara |
Brief look, right side boiling |
| 19596 |
16 Sep 2021 @ 0649 |
--- |
Graham |
Still right side boils. |
| 19591 |
15 Sep 2021 @ 1800 |
--- |
Dan A |
Right side boiling continues |
| 19588 |
15 Sep 2021 @ 1335 |
--- |
Dan A |
Still right side boiling with cycles every 20 minutes or so |
| 19573 |
15 Sep 2021 @ 0655 |
--- |
Graham |
Still right side boils.. |
| 19572 |
15 Sep 2021 @ 0030 |
--- |
William |
right side boiling only. |
| 19569 |
14 Sep 2021 @ 1745 |
--- |
CrisG |
right sided boiling still |
| 19565 |
14 Sep 2021 @ 1430 |
--- |
Dan A |
North side boiling continues |
| 19554 |
14 Sep 2021 @ 0725 |
--- |
CrisG |
Right side boilfest continues |
| 19531 |
13 Sep 2021 @ 1542 |
--- |
Suzanne |
Still boiling on the north side and cycling about every 19 minutes |
| 19523 |
13 Sep 2021 @ 0909 |
--- |
Brian |
Still in north/right side boil mode |
| 19518 |
12 Sep 2021 @ 1715 |
--- |
Ben VL |
N. Side boiling, did not stay for an entire cycle. |
| 19511 |
12 Sep 2021 @ 1447 |
--- |
Brian |
Right side boil-fest continues… |
| 19507 |
12 Sep 2021 @ 0905 |
--- |
William |
Right side boiling only |
| 19502 |
12 Sep 2021 @ 0653 |
--- |
Graham |
Still right vent boils. |
| 19492 |
11 Sep 2021 @ 1950 |
--- |
Graham |
Still right side boil cycles. |
| 19496 |
11 Sep 2021 @ 1250 |
--- |
MarioD |
Observed from 12:50 to 13:15; several cycles of right side boils noted, some high enough to splash water onto the platform above |
| 19473 |
11 Sep 2021 @ 0749 |
--- |
Graham |
Still right vent boils. |
| 19451 |
10 Sep 2021 @ 1840 |
--- |
Graham |
Right vent boils, cycles 17 to 20m reported all day. |
| 19414 |
10 Sep 2021 @ 0648 |
--- |
Graham |
Still right vent boils. |
| 19395 |
09 Sep 2021 @ 1745 |
--- |
Suzanne |
Splashing continues from the North vent, cycling every 19 to 20 minutes. |
| 19384 |
09 Sep 2021 @ 0633 |
--- |
Graham |
Still doing right side boils. |
| 19378 |
08 Sep 2021 @ 1945 |
08 Sep 2021 @ 1950 |
Tara |
Very brief check, boiling on north/river side, ordinary cycle |
| 19376 |
08 Sep 2021 @ 1740 |
--- |
Dave W |
All activity still on north side. |
| 19366 |
08 Sep 2021 @ 0645 |
--- |
Graham |
ES right vent still active. No transition to left yet |
| 19361 |
07 Sep 2021 @ 1200 |
07 Sep 2021 @ 1728 |
geysergaze |
No change in activity since this morning. 18-21 minutes cycles. All activity on the right / north -west side. Left side not doing much. |
| 19345 |
07 Sep 2021 @ 0633 |
--- |
Graham |
Right North vent still the active one. Peak 0641, gap, 0801, gap, 0859, gap, 0956, gap, 1152, 1211, 1230, |
| 19337 |
06 Sep 2021 @ 1800 |
--- |
Graham |
All today's reports have been of N vent cycles 19 or 20m long. |
| 19326 |
06 Sep 2021 @ 0752 |
--- |
Suzanne |
Boiling from the north side and cycling every 20 minutes. At the peak height water flows into the far left (south) runoff channel and the alcove vent on the north side splashes a few inches above the rim, enough to form puddles on the north side of the crater. The previous peak was at 0751. |
| 19321 |
05 Sep 2021 @ 1825 |
--- |
Graham |
Observed 3 cycles of 20min with North vent boils. Similar reports all day from other observers. |
| 19317 |
05 Sep 2021 @ 1515 |
05 Sep 2021 @ 1635 |
Tara |
cycling about every 20 minutes with boiling on north (river) side |
| 19307 |
04 Sep 2021 @ 2039 |
--- |
Graham |
After normal splashy cycle, pool dropped and went calm. Side vents were steamy and noisy for 7m. Pool stayed calm and did not rise for 10m. 2049 water rose with strong North River side boil this time and then dropped. Side vents steamy and noisy 2056. 2059 water rising. Right side boil, then left joined in and it erupted! |
| 19319 |
02 Sep 2021 @ 1600 |
--- |
Graham |
20min cycles of boiling from right North vent, similar to yesterday. |
| 19237 |
01 Sep 2021 @ 1405 |
01 Sep 2021 @ 1720 |
Graham |
20min cycles from below overflow to peak water. Vent on River side active, holding thick boil at rim height at peak and splashes 1 foot over rim. Cycles very regular in fill rate and boiling. Similar to what Micah reported on 5 Aug. |
| 19169 |
30 Aug 2021 @ 2000 |
--- |
Dan A |
1955 big surging on south side of pool that built into bursting from the center pool around 8’. Water was also bursting from one of the holes |
| 19163 |
30 Aug 2021 @ 1202 |
30 Aug 2021 @ 1445 |
Tara |
I suspect a major eruption has occurred recently, grass is matted on the SSE side, water is slightly murky. Minor activity has changed drastically from 1 week ago, when I saw only moderate overflow and weak 6-18" cyclical boiling on the north (river) side. Today I arrived to find heavy overflow and boiling to 1-3' on the south (bank) side. At 1204 his built to surging to 3-5', followed by churning bursts from the center of the pool reaching 4-8' for about a minute, with overflow spilling over all sides. At 1206 the water level began to drop and the surging subsided. As the water fell to its lowest point 1.5' below the bathtub mark, the side vent to the south began to gurgle and then splash weakly to 1-3' for about a minute. Boiling and bursting continued on the south side from a low water level reaching 1-3' but becoming weaker as the water level rose. 1217 the pool reached overflow again. 1218 variable boiling resumed on south side, highest water level 2" below bathtub mark, 1220 water level drop to 6-8" below mark. 1227 water had risen to 2-3" below mark, pool mostly calm with some light boiling, still holding at 1235. 1240 water level 2" below mark, increasing boiling on south side. 1252 water level rose to bathtub mark, heavier overflow, boiling 1-3' on south side. 1254 boiling extending into center of pool. 1255 water level dropped slightly and bursting began that built to churning at 1256. Action similar to previous minor but weaker, max height 4-5' and d~1m. Side vent gurgling after but only a few.drops of water seen. 1257 water level drop to about 1' below mark. 1306 water level back up to mark, boiling extending frol south side into center of pool. Side vent stopped gurgling at this time. 1307 bursting and churning d~1m h~4-6', 1309 water level drop & side vent gurgling with spits 1-3', more bursting briefly at 1310. 1315 water level holding 8" below mark, side vent continues to gurgle. Cycles continued to stabilize at about 20 minutes, with peak boiling reaching ~4' occurring as the pool dropped. |
| 19136 |
28 Aug 2021 @ 1918 |
--- |
User34 |
Overflowing and boiling vigorously from the righthand side |
| 18842 |
05 Aug 2021 @ 1407 |
05 Aug 2021 @ 1503 |
Micah Kipple |
East Sentinel is cycling it's water level up and down approximately every 20 minutes (first ovf to first ovf). Upon reaching overflow, superheated boiling 3-12" high commences on the North (River side) of the crater. This waxes and wanes until about 10 minutes after first overflow, when the entire pool suddenly lifts ~3" and the superheated boiling surges to 2', sending runoff trickling down the backside into the river. When the pool drops about 15 minutes after first overflow, there is some small lazy bursting from a single vent on the south (Bank) side of the pool to about 12". Then the water starts coming up and the cycle repeats. |
| 18803 |
02 Aug 2021 @ 0945 |
--- |
hkoenig |
Appears to have had major eruption in last couple of days. Some catch basins full. Dead grasses pointing upriver and dead plants as much as 10m from the vent in southern alcove. Flow marks still visible at spots. 25cm high boiling along downstream rim.
Based on Tara Cross' comment, added an eruption entry for ~2021 Aug 01 01:00 |
| 12400 |
07 Jul 2019 @ 1152 |
--- |
User34 |
Flat, river flowing well through near channel. |
| 9929 |
29 Aug 2018 @ 1720 |
--- |
Micah Kipple |
Still flat and being drowned by the river. |
| 9204 |
15 Jul 2018 @ 1850 |
--- |
Micah Kipple |
Pool surface quiet but steadily overflowing and almost imperceptibly rising and falling. Side vent is completely inundated by the side channel of the Firehole. |
| 5217 |
22 Aug 2017 @ 1041 |
--- |
CrisG |
pool full and quiet. no bubbling or splashing. |
| 4075 |
09 May 2017 @ 1115 |
--- |
mhreed |
Placidly overflowing. |
| 3519 |
21 Aug 2016 @ 1030 |
21 Aug 2016 @ 1055 |
mhreed |
Energetic boiling/splashing from left two vents. Splashing on push reached 3 ft. with highest droplets to 5 ft. and agitated the entire pool. |
| 3197 |
03 Jul 2016 @ 1332 |
03 Jul 2016 @ 1530 |
JSJ |
East Sentinel Geyser was in minor eruption from 1332 to 1530 from the side vent. Activity ranged from moderately weak to moderately vigorous splashing. Pool water level varied, with episodes of good overflow to intermittent overflow to no overflow. Brief pauses in eruptive activity at 1401 and 1455 and 1514. Moderately vigorous splashing at 1437 to 1438 wet part of the cone. No major eruptions observed, angled or vertical. |
| 3023 |
09 Jun 2016 @ 1200 |
09 Jun 2016 @ 1320 |
CrisG |
Pool full and quiet. No spashing or bubbling noted. |
| 2766 |
20 Apr 2016 @ 1430 |
--- |
User34 |
Boiling has switched to the right side, area looks washed, and hillside damp, may have been a major that was seen on the webcam last night |
| 2729 |
15 Apr 2016 @ 2000 |
--- |
WillBoekel |
grass mowed over above feature. has erupted recently. |
| 1974 |
24 Jul 2015 @ 1500 |
24 Jul 2015 @ 1645 |
Micah Kipple |
East sentinel and it's side vents are going through cyclic activity. Every 20-25min East sentinel will have a surging minor eruption from 4-8 feet from the north vents. Simultaneously the side vents on the platform will erupt to 3 feet. The minor dies down into strong boiling which continues through the extra overflow and drop just before the minor. There is no more evidence for major eruptions in the past week. |
| 1113 |
22 Jul 2014 @ 1228 |
--- |
WillBoekel |
Having 1-2inch simmering on river side of the crater at 1228 |
| 1080 |
13 Jun 2014 @ 0000 |
13 Jun 2014 @ 2359 |
Micah Kipple |
Sitting at overflow completely quiet, no evidence of activity of any kind. The river channel adjacent to it is completely full, the side vent located in the channel is completely drowned. |