| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 38322 |
25 Feb 2025 @ 1547 |
--- |
novakg |
Arsenic seen ie in photos posted to the Geyser Discussion Board on Facebook. |
| 37821 |
29 Oct 2024 @ 1013 |
--- |
MAB |
per steam looks like it fills flows down channel a bit then recedes |
| 37755 |
24 Oct 2024 @ 1156 |
24 Oct 2024 @ 1514 |
SantaFe108 |
No eruptions during this time, periodically steaming. |
| 36803 |
06 Sep 2024 @ 1344 |
--- |
cb |
no water. channel is dry |
| 34237 |
19 Apr 2024 @ 0922 |
19 Apr 2024 @ 1150 |
MAB |
when possible {lots steam + wind} I noted when low burbling started - these would maybe stop but return fairly quickly with surges to 2ft {3ft at best) before abruptly stopping - some would not stop but just continue burbling before building to the surge - the highest surge durations were less than 50sec - when possible to see general intervals were ~5-6min |
| 29321 |
31 Oct 2023 @ 1200 |
--- |
MAB |
no audible eruptions all morn - when fog would clear briefly saw a little steam creeping down channel - but it never reached Colloidal |
| 25940 |
30 May 2023 @ 0850 |
30 May 2023 @ 1910 |
MAB |
Arrived at the bench 0850 - IE in a low burble most of the day with activity notably increasing a few times {0923 1226 1453 & 1620 seen} to the point that in other years it would be the start of a full eruption. Those surges were from 12-18in lasting about 60sec |
| 25875 |
28 May 2023 @ 2035 |
28 May 2023 @ 2130 |
SantaFe108 |
Splashing from inches to ~1ft high. Lighting is not good so couldn't tell if there was a pause at any point. |
| 25527 |
18 May 2023 @ 0905 |
--- |
MAB |
0905 thru 1500 - burbling varying in intensity - at the peak bursts could be nearly 12in - hard to discern if it ever actually stopped - even harder to see once the day warmed up |
| 25060 |
27 Feb 2023 @ 1400 |
--- |
MAB |
approx time - seen from various vantage points appeared to have low burbles but hard to see with steamy conditions - never saw anything more than a few inches in height if that |
| 24588 |
30 Oct 2022 @ 1828 |
--- |
MAB |
briefly big @1827-1828 but won't enter others - see Friday 28th Note |
| 24526 |
29 Oct 2022 @ 1811 |
--- |
MAB |
same deal as yesterday low play then ~30s of bigger bursts near end then repeat but I'm not writing them down |
| 24507 |
28 Oct 2022 @ 0836 |
28 Oct 2022 @ 1838 |
MAB |
Definitely Periodic! Thought I heard splashes in the morn but couldn't see a thing. Low burbles then were observed to pause every ~5m. As visibility improved I could see some decent height bursts some as much as 4ft, full bodied and wide. Those best-bursts lasted 30s or less then the flow {and steam} flowing into Colloidal would cease. Some of the low play would not evolve into the larger bursts but no way to know which would or would not, and finding an actual start to time was a problem, so I collected times of the biggest bursts as 'IE near end' because I wanted these intervals saved for the record. Some are obviously not Closed Intervals as Constant or Whirligig took my attentions but you get the idea. |
| 24393 |
15 Oct 2022 @ 1842 |
--- |
MAB |
still burbling as high as 8in as seen the last 2 days |
| 24267 |
05 Oct 2022 @ 1434 |
05 Oct 2022 @ 1600 |
cb |
continuous small low level blips observed from the Constant bench |
| 23884 |
17 Sep 2022 @ 1715 |
17 Sep 2022 @ 1830 |
MAB |
steady low play from 1-4in |
| 23563 |
04 Sep 2022 @ 1245 |
--- |
cb |
barely visable splashes in the vent observed above with binoculars |
| 23373 |
23 Aug 2022 @ 1030 |
23 Aug 2022 @ 1825 |
MAB |
burbling to a few inches during most of my time today - some up to 8in - some pauses - repeat |
| 23253 |
18 Aug 2022 @ 1852 |
--- |
MAB |
seen burbling 6in or so from above until it was out of sight |
| 23227 |
16 Aug 2022 @ 1703 |
16 Aug 2022 @ 1723 |
MAB |
small burbling barely visible - stopped 1723 |
| 23053 |
05 Aug 2022 @ 1120 |
05 Aug 2022 @ 1314 |
cb |
a steady blipping boil ~2"-5" |
| 22395 |
08 Jul 2022 @ 0944 |
08 Jul 2022 @ 1125 |
cb |
low level blips |
| 22243 |
30 Jun 2022 @ 1052 |
--- |
cb |
start of low level (just visable) blips. |
| 21491 |
25 May 2022 @ 1007 |
--- |
Graham |
Boiled up but then quit. |
| 20276 |
03 Nov 2021 @ 0828 |
03 Nov 2021 @ 1612 |
MAB |
morphed between low burps and more robust bursts of maaaybe 15in all day with a few seconds of quiet - may be regular but didn't track it closely |
| 20178 |
28 Oct 2021 @ 0840 |
28 Oct 2021 @ 1522 |
MAB |
low burble all day - puts out enough water to steam up the runoff channel - a few times it built a few inches higher like typically pre start but no go |
| 20117 |
24 Oct 2021 @ 0855 |
24 Oct 2021 @ 0921 |
MAB |
Low burbling while in the area |
| 19951 |
10 Oct 2021 @ 0852 |
--- |
MAB |
low burbling while in the area - didn't build any higher that I saw |
| 18306 |
07 Jul 2021 @ 0939 |
--- |
cb |
looks recently post eruptive. very wet runoff channel and gently steaming. |
| 18038 |
22 Jun 2021 @ 1232 |
--- |
MAB |
visible burbles after 0900 which
slowed by 1000 - viewed from above 1232 vent area has water but is not overflowing |
| 17717 |
12 Jun 2021 @ 1900 |
--- |
MAB |
Tiny burbles visible from above - runoff channel damp most of the way to Colloidal |
| 17544 |
07 Jun 2021 @ 0902 |
--- |
MAB |
Saw Arsenic burbling in the morning but it never progressed - coming back from Nuphar @ 1800 water is visible around the vent and down the channel but no steam |
| 17074 |
12 May 2021 @ 0936 |
--- |
MAB |
heavy steam in channel all the way to Colloidal- must have just finished |
| 8004 |
26 Apr 2018 @ 1127 |
--- |
Micah Kipple |
It's having very frequent splashing 10-20 cm but am only entering true jetting eruptions. |
| 4171 |
31 May 2017 @ 1200 |
--- |
kc |
Arsenic was on and off all afternoon with durations ranging from 1 to 5 minutes. |
| 3987 |
21 Apr 2017 @ 0956 |
21 Apr 2017 @ 1022 |
MAB |
Appears to start, but never reaches full height. Not closed intervals as it was very steamy and I was walking around the lower loop. |
| 2398 |
21 Sep 2015 @ 0930 |
21 Sep 2015 @ 1410 |
MAB |
Burbling and looking pre-eruptive for 4 hours, no eruption seen. Same for the afternoon visit from 1641 - 1750 |
| 2380 |
18 Sep 2015 @ 0603 |
--- |
MAB |
I had a good handle on Arsenic pre-disturbance. It has skunked me the last 4 visits, sometimes burbling and looking quite pre-eruptive. Jake may have seen the last one for a while! I will start noting the burbles that are about 4" and see if they fit the interval pattern from earlier this month. I hope I am just unlucky and am missing them. |
| 3756 |
15 Aug 2015 @ 0941 |
--- |
jh23487 |
Arsenic was either erupting or bubbling a little, not very tall. Possibly at the end of an eruption. |
| 29755 |
09 Jun 2007 @ 1130 |
--- |
research-mab |
6/9/2007 - Arsenic has been burping on & off since 1130 hrs. |
| 29794 |
11 Jun 2006 @ 1200 |
--- |
research-mab |
6/11/2006 - no time noted - Arsenic 2-7 minute intervals. |
| 29930 |
19 Apr 1998 @ 1200 |
--- |
research-mab |
4/19/98 - no time noted - Arsenic is only having heavy boils. |
| 29920 |
06 Apr 1998 @ 1200 |
--- |
research-mab |
4/6/1998 - no time noted - Lots of interesting things going on in Porcelain Basin... . Arsenic is anemic. |
| 30220 |
26 Oct 1994 @ 1200 |
--- |
research-mab |
10/18-26 1994 - no times noted - Arsenic had a very strange start. It began its normal eruption, got to approx 1½ feet then quit after 2 minutes! About 30 minutes later it started again!! This time a normal eruption. Very strange. |
| 4696 |
02 Jul 1988 @ 1800 |
--- |
research-mab |
7/2/1988 Also, Arsenic geyser is erupting this summer. |
| 33467 |
26 Apr 1987 @ 1217 |
26 Apr 1987 @ 1546 |
research-mab |
04/26/1987 Arsenic Geyser – Interesting cycle of activity noted in Arsenic. At 12:17, 12:23, and 13:31, a 2 – 5 foot, 20 second eruption occurred. The vent was then quiet until another cycle at 13:07, 13:12, 13:16, 13:20, 13:32, 13:35, 13:44 and 13:49. Each eruption lasted a little longer and was slightly more powerful. The third cycle was at 14:01, 14:14, 14:23, 14:33, 14:36, and 14:49. The water in all the eruptions was a muddy grey. Another minor at 15:01:27 suddenly started into a major eruption.
Ranging from 3 – 20 feet, it ended at 15:46:31. The major started with muddy water but it cleared to a more clear blue. |
| 7638 |
26 Jun 1986 @ 1800 |
--- |
research-mab |
6-26-1986 Arsenic Geyser – Active. Clear, full, boiling before eruption. T=201º |
| 31021 |
02 Sep 1984 @ 1200 |
--- |
research-mab |
9/2/1984 - no time noted - Much activity on Porcelain compared to normal. Arsenic, and Fireball very active. |
| 30972 |
12 Jun 1984 @ 1200 |
--- |
research-mab |
Tuesday June 12 1984 - no time noted - Arsenic and Fireball playing simultaneously for several minutes. |
| 7604 |
11 Feb 1984 @ 1800 |
--- |
research-mab |
2-11-84
Arsenic Geyser active. |
| 5367 |
11 Aug 1983 @ 1800 |
--- |
research-mab |
8/11/1983 Arsenic Fireball Splutterpot in simultaneous eruption
{time unknown} |
| 31080 |
20 May 1983 @ 1200 |
--- |
research-mab |
May 20 1983 - no time noted - Disturbance!... Arsenic – perpetual wheezy eruption, smaller than normal. The spouters behind Arsenic are active too. {geezer? mab} |
| 31384 |
26 Aug 1982 @ 1200 |
--- |
research-mab |
Aug 26 1982 - no time noted - Arsenic erupted in afternoon |
| 31344 |
17 Jul 1982 @ 1201 |
--- |
research-mab |
Some Temps from Porcelain Basinland taken on July 17th - no time noted - Arsenic 200º overflowing splashing 3’ above the vent. |
| 31328 |
17 Jul 1982 @ 1200 |
--- |
research-mab |
July 17, 1982 - no time noted - Arsenic in a low constant eruption |
| 31320 |
08 Jul 1982 @ 1400 |
08 Jul 1982 @ 1845 |
research-mab |
July 8th – TM in Porcelain 1400-1845 - Arsenic Geyser Most of time I was in the Porcelain Basin it was barely spouting above the main vent. Except: (below) 3:54 to 4:07= went up to 6 feet = maybe few bursts little higher- 18:25 to some afterwards= went to 3 or 4 feet |
| 31298 |
07 Jul 1982 @ 1200 |
--- |
research-mab |
7/7/1982 - no time noted - Arsenic in a low, probably perpetual eruption. |
| 31590 |
11 Dec 1981 @ 1200 |
--- |
research-mab |
Dec 11 1981 - no time noted - Arsenic 178º ie but not in the H20 as it was being ejected. Bursts 7-10’ The eruption lasted at least ½ hr. & it was still sputtering an hour later |
| 4644 |
14 Aug 1981 @ 1200 |
--- |
research-mab |
8/14/1981 - no time noted - Arsenic Geyser is in perpetual spluttering as is Moxie and 2 other small spouters. Fireball is somewhat weak. GS |
| 31509 |
13 Aug 1981 @ 1200 |
--- |
research-mab |
Aug 13 1981 - no time noted - Acute Spouter was in a perpetual 1 to 2 foot eruption all day
Arsenic and Sunday geyser were also perpetually playing. |
| 31455 |
02 Aug 1981 @ 1200 |
--- |
research-mab |
Sunday August 2 1981 The Basin Wide Disturbance has occurred! - no time noted - Arsenic Geyser – in a low perpetual 2 to 5 foot eruption, clear water all day, 203ºF |
| 31807 |
27 Sep 1980 @ 1200 |
--- |
research-mab |
Saturday September 27 1980 - no time noted - Arsenic Geyser – erupting 2 to 6 feet, 203ºF |
| 4615 |
22 Sep 1980 @ 1800 |
--- |
research-mab |
9/22/1980 Arsenic Geyser – in a low eruption a good share of the day ie 204ºF |
| 31752 |
09 Sep 1980 @ 1200 |
--- |
research-mab |
Tuesday Sept 9 1980 - no time noted - Arsenic Geyser – not ie 199° |
| 4762 |
22 Jul 1980 @ 1315 |
22 Jul 1980 @ 1330 |
research-mab |
7/22/80 Porcelain 1:15-1:30
-Arsenic – constant, one to two feet |
| 5133 |
01 Jun 1980 @ 1800 |
--- |
research-mab |
06/01/1980 Arsenic was observed in two different eruptions to 5’. (no times) |
| 31989 |
27 Sep 1979 @ 1200 |
--- |
research-mab |
September 27 1979 - no time noted - Arsenic Geyser – 200ºF- continues perpetual eruption of clear water 2 to 6 feet high. |
| 31982 |
26 Sep 1979 @ 1200 |
--- |
research-mab |
September 26 1979 - no time noted - Arsenic and Acute Spouter continue their small, perpetual eruptions. |
| 5065 |
21 Sep 1979 @ 1200 |
--- |
research-mab |
09/21/1979 - no times noted - Africa, Fireball, Arsenic and Geyser north of Constant all perpetual spouters. {probably Acute Spouter?-mab} |
| 5060 |
15 Aug 1979 @ 1800 |
--- |
research-mab |
08/15/1979 Five geysers erupted in concert today down in the Porcelain Basin Arsenic, Africa, Fireball, Little Wirlygig, and Constant.
A new small geyser (sideways) erupted 1 foot today on the eastern side of Constant. {probably Acute spouter?- mab} |
| 4967 |
01 Jul 1978 @ 1110 |
--- |
research-mab |
07/01/1978 Good activity out of Porcelain this morning. Between 1000 am and 1110 am geysers in eruption included Fireball, Africa, Blue, Dark Cavern, Big Whirligig (twice), Constant (twice) and * Arsenic Geyser (10 min+). *Today was the first recorded observation of this geyser in eruption recorded this summer. |
| 5116 |
19 Aug 1977 @ 1800 |
--- |
research-mab |
08/19/1977 Arsenic splashing up to 15” high, much as it did for most of last year. |
| 32286 |
12 Jul 1977 @ 1800 |
--- |
research-mab |
07/12/1977 - no time noted - Africa Fireball Arsenic Blue Big Whirly and Constant all in eruption at once. |
| 32260 |
22 Jan 1977 @ 1800 |
--- |
research-mab |
Jan 22 1977 (Rick H) - no time - Arsenic Geyser – in eruption in pm 8 feet |
| 5239 |
07 Sep 1976 @ 1800 |
--- |
research-mab |
09/07/1976 Arsenic – mainly steam |
| 32486 |
18 Aug 1976 @ 1200 |
--- |
research-mab |
08/18/1976 - no times noted - Arsenic putting out a lot of steam, Moxie seen in action only twice. |
| 32472 |
08 Aug 1976 @ 0920 |
--- |
research-mab |
08/08/1976 Arsenic in a steam phase 0920 – only minor puffs of steam being emitted |
| 32471 |
07 Aug 1976 @ 1630 |
--- |
research-mab |
08/07/1976 - Arsenic eruptions seemed to be related to eruptions of Moxie. When observed from 430-500. When Moxie erupted Arsenic would decline to nearly nothing. Then it would surge forth strongly when Moxie was inactive. |
| 5271 |
28 Jul 1976 @ 0900 |
--- |
research-mab |
07/28/1976 Ragged & Arsenic both active as usual at 9:00 |
| 5554 |
20 Jul 1976 @ 1800 |
--- |
research-mab |
07/20/1976 Arsenic & Fireball continue their nearly constant type of activity, but the intensity of the activity varies. |
| 5535 |
29 Jun 1976 @ 1540 |
29 Jun 1976 @ 1600 |
research-mab |
06/29/1976 Arsenic, Moxie & Pinto erupting simultaneously from 3:40 -4:00 |
| 5863 |
28 Jun 1976 @ 1550 |
28 Jun 1976 @ 1610 |
research-mab |
Arsenic Geyser erupting constantly during above interval. |
| 5836 |
21 Sep 1974 @ 1428 |
--- |
research-mab |
09/21/1974 1428 Africa quits, now only Arsenic {noted as Geezer in log} is erupting (3’) |
| 6203 |
26 Sep 1973 @ 1800 |
--- |
research-mab |
09/26/1973
Temperatures taken yesterday
Arsenic Geyser 200 – not erupting
{included here since it’s not mentioned much this year-mab} |
| 32849 |
25 Sep 1973 @ 1200 |
--- |
research-mab |
9/25/1973 - no time - Arsenic Geyser 200° – not erupting {mab - included here since it’s not mentioned much this year tho 1974 ID of this feature was wrong will put it here} |
| 5925 |
17 Mar 1973 @ 0800 |
--- |
research-mab |
03/17/1973 Arsenic was in its “steam phase” during all of this time.{written in morning section of log} |
| 5912 |
12 Mar 1973 @ 1200 |
12 Mar 1973 @ 1815 |
research-mab |
03/12/1973 Arsenic The water level was seen throughout the morning and early afternoon to be gradually rising in the vent. Accompanying the filling was continuous minor play with splashing originating at the northeastern end. During the afternoon the minor play became gradually more vigorous with water occasionally splashing out. At 1342 the last 3-4 inches to the top of the vent rapidly filled and was accompanied by the splashing changing into a series of fountain-like jets with massive overflow & runoff. After 9 minutes of play the water bursts became intermittent & more mixed with steam to end the true water phase.
At 1445 the “steam phase” was still in progress with occasional bursts up to 2-3 feet, while at 1610 all play had ceased. A second phase of activity began sometime between 4:30 and 4:40, with the new “steam phase” beginning at approximately 4:45 and running to approximately 6:15. |
| 5910 |
10 Mar 1973 @ 1635 |
--- |
research-mab |
03/10/1973 At 4:35 Feisty, dark Cavern, Africa, Little Whirligig, Fireball, Blue, Arsenic, and Constant Geyser were all seen to be playing at the same time. (for 10-15 seconds due to the very short duration of Constant) Four playing together is not unusual but 8 is. |
| 6489 |
11 Sep 1972 @ 1200 |
--- |
research-mab |
09/11/1972
Bear Den, Dark Cavern, Africa. L. Whirligig, Blue, Fireball & Arsenic all have been observed in eruption this morning. {generic a.m. time} |
| 6428 |
19 Aug 1972 @ 1800 |
--- |
research-mab |
08/19/1972 Little Whirligig, arsenic, & Africa are still playing continuously. Ledge still has intermittent spray type minor play. |
| 6398 |
15 Aug 1972 @ 1800 |
--- |
research-mab |
08/15/1972
Arsenic – still in constant eruption, spraying water to a height of 5-7 feet. |
| 6396 |
14 Aug 1972 @ 1800 |
--- |
research-mab |
08/14/1972
L. Whirligig & Arsenic are still in continuous eruption. |
| 6387 |
12 Aug 1972 @ 1200 |
--- |
research-mab |
08/12/1972 - no time - Arsenic & Little Whirligig have not been observed to quit yet. |
| 7866 |
09 Aug 1972 @ 0800 |
09 Aug 1972 @ 1800 |
research-mab |
8/9/1972 Arsenic Geyser in constant 2-8’ eruption all day (before 8:00am to after 6:00 pm) normal 3-4 hours |
| 6350 |
23 Jul 1972 @ 1400 |
--- |
research-mab |
07/23/1972
At the end of the 1:30 walk there were 6 geysers in simultaneous eruption – Blue, Iris, Fireball, Arsenic, Africa and Little Whirligig. |
| 6334 |
08 Jun 1972 @ 1548 |
--- |
research-mab |
06/08/1972
Africa, Bear Den, Ledge, L. Whirligig, Arsenic and Possibly Blue (crossed out “Iris”) were all erupting at the same time at 3:48 |
| 6498 |
15 May 1972 @ 1800 |
--- |
research-mab |
05/15/1972 Arsenic geyser – have not noticed an eruption 148º |
| 33197 |
15 May 1972 @ 1200 |
--- |
research-mab |
May 15 1972 - no time - 198F Active all summer, playing several times a day – no time taken play for 15 to 20 minutes up to 5 to 8 feet. Check Log. |
| 7670 |
12 Aug 1970 @ 1800 |
--- |
research-mab |
08/12/1970
Much activity in Porcelain in late pm (6-7)
Arsenic, Fireball, and Fan went off in succession.
8/12/1970 Dark Cavern had extended eruption also. |
| 33196 |
19 Aug 1969 @ 1200 |
--- |
research-mab |
1969 – Aug 19 1969 - no time - 200ºF Plays for about 15 minutes every ___ minutes. |