| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 37725 |
24 Oct 2024 @ 1547 |
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SantaFe108 |
Gently huffing steam with a deep growl. |
| 37476 |
10 Oct 2024 @ 1015 |
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SantaFe108 |
Emitting steam with a deep grumbling. |
| 37379 |
03 Oct 2024 @ 1532 |
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SantaFe108 |
Gently emitting steam while making a deep rumbling noise. |
| 35427 |
21 Jun 2024 @ 1547 |
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nails |
Light steam and quiet grumbling |
| 35087 |
10 Jun 2024 @ 1244 |
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SantaFe108 |
Deep grumbling, steaming. |
| 29032 |
22 Oct 2023 @ 0848 |
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SantaFe108 |
Gently forcing steam. Root Pool is full, boiling towards the trail. Also boiling in the middle pool and on the rim towards Arch. |
| 28930 |
20 Oct 2023 @ 1615 |
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MAB |
steamy - pool #1 below it {the gray one} had a boil bringing up dark material
=
ROOT POOL not as high as reported 2 weeks ago but closer to the high water mark - all pools connected |
| 27339 |
30 Jul 2023 @ 0843 |
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ypcaribou |
Root Pool quite full (divide between pools fully covered). A light, milky, minty jade green. |
| 27298 |
28 Jul 2023 @ 2043 |
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SantaFe108 |
Grumbling at depth. Larger two of the three pools to the west are connected. Smallest is bubbling with muddy grey water. |
| 27172 |
23 Jul 2023 @ 1422 |
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mhreed |
Light, rhythmic huffing. |
| 26944 |
08 Jul 2023 @ 1918 |
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nails |
Softly grumbling |
| 26823 |
04 Jul 2023 @ 0850 |
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MAB |
audible grumbling with tiny airborne droplets |
| 24576 |
30 Oct 2022 @ 1638 |
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ypcaribou |
Huffing deep down in vent. Steam uphill as well. 3 pools area to right is quite flooded toward the far end. |
| 23957 |
20 Sep 2022 @ 1610 |
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ypcaribou |
Gently steaming with a deep, glutteral rumble. Bit of steam coming out uphill. Three pools to right are: Small is murky tan. Middle is emerald green with scum on surface, water is clear on top. Lg is murky light brownish muddy green. |
| 21008 |
18 Apr 2022 @ 1725 |
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MAB |
steamy w a dull growl- all pools west of base connected |
| 17740 |
12 Jun 2021 @ 1623 |
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MAB |
Noisy forced steam - the different colored pools below it on the flats are barely connected |
| 12014 |
28 Jun 2019 @ 0745 |
28 Jun 2019 @ 1045 |
ypcaribou |
Water in springs below and to the left of Arch Steam Vent about 1-2 feet low. |
| 11028 |
20 Apr 2019 @ 1031 |
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MAB |
Noisy forced steam |
| 9661 |
10 Aug 2018 @ 1331 |
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MAB |
Pools below and west are 3 different colors - might suggest different water sources. 1st (closest to Arch) is grayish white, 2nd green, 3rd is taupe. |
| 3998 |
22 Apr 2017 @ 2020 |
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Micah Kipple |
Heavy wash and debris downslope. Sinter blocks and stones lodged on uphill side of trees and logs. Looks wet but that could be snow melt. |
| 1101 |
07 Jul 2014 @ 0000 |
07 Jul 2014 @ 2359 |
MAB |
Norris log - Arch Steam Vent showing evidence of eruption- runoff channel and fresh debris in the path |
| 4356 |
02 Oct 2001 @ 0800 |
02 Oct 2001 @ 1800 |
research-mab |
10/2/2001 A visitor reported a lot of mud around Arch Steam Vent today. I left the desk briefly to check it out. John Tebby & I walked down and found trees covered in mud, huge mud flows around the boardwalk and a big sink hole in the inside of the boardwalk (NW of the vent). There was a light spatter of mud on the boardwalks as far away as 25 feet. Last recorded eruption {obscured in my captures of the log -will probably find it as I work back in time MAB} |
| 4749 |
30 Sep 2001 @ 1800 |
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research-mab |
09/30/2001 ARCH STEAM VENT: Erupted w/ sprays of mud & mudflows & opened up a sink hole. Time unknown. |
| 29952 |
07 Jul 1998 @ 1200 |
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research-mab |
7/7/1998 - no time noted - Arch Steam Vent – gently steaming, soft boiling sound |
| 10891 |
25 Apr 1994 @ 1200 |
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research-mab |
4/25/1994 {generic day time}
A little water was seen from Arch Steam Vent |
| 30358 |
13 Jul 1992 @ 1200 |
--- |
research-mab |
7/13/1992 - no time noted - Root Pool -near Arch Steam Vent- has dropped it water level about 2 ft!! |
| 30497 |
16 May 1991 @ 1200 |
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research-mab |
5/16/1991 - no time noted - Arch Steam Vent – footprints up the slope, already steaming gently; pool to right at base of hill is blue |
| 33429 |
06 Oct 1986 @ 1200 |
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research-mab |
October 6, 1986 - no time noted - *ROOT POOL. If it is the normally muddy feature just past (East of) Arch Steam Vent, is almost a foot down from normal levels. Quite a bit of cave-in around the rim of the big pool, maybe not new. |
| 31229 |
20 Feb 1982 @ 1200 |
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research-mab |
February 20 1982 - no time noted - Arch Steam Vent 203° gently steaming |
| 31534 |
30 Aug 1981 @ 1200 |
--- |
research-mab |
Sunday August 30 1981 - no time noted - Arch Steam Vent 203° moderate steaming |
| 31471 |
03 Aug 1981 @ 1200 |
--- |
research-mab |
August 3 1981 - no time noted - Arch Steam Vent – 200º gently puffing |
| 31419 |
06 Jun 1981 @ 1200 |
--- |
research-mab |
Saturday June 6 1981 - no time noted - Arch Steam Vent – Steaming lustily, water heard boiling deep within. 204°F |
| 31761 |
15 Sep 1980 @ 1200 |
--- |
research-mab |
Monday September 15, 1980 - no time noted - {disturbance onset -} Arch Steam Vent – No apparent change 202ºF |
| 31962 |
21 Sep 1979 @ 1200 |
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research-mab |
Friday September 21 1979 - no time noted - More end of summer changes! Arch Steam Vent – unchanged – 200ºF |
| 31845 |
21 Jun 1979 @ 1200 |
--- |
research-mab |
June 21 1979 Thursday - no time noted - Arch Steam Vent – 201ºF A Robin is nesting in the dead lodgepole below – Mrs. Decker? |
| 32094 |
02 Jun 1978 @ 1200 |
--- |
research-mab |
06/02/1978 - no time noted - Arch Steam Vent - 202° F ; blue pool 25 ft to the north 109° |
| 32406 |
10 Jul 1976 @ 1200 |
--- |
research-mab |
July 10 1976 - no time noted - Lake between Arch Steam Vent and Dishwater Spring is drying up. |
| 5719 |
15 Aug 1974 @ 1800 |
--- |
research-mab |
08/15/1974 Arch Steam Vent runoff damp – sign & log retrieved from trees nearby. |
| 5709 |
18 Jun 1974 @ 1120 |
--- |
research-mab |
06/18/1974 1120 Marker at Arch Steam Vent washed out, replaced. |
| 5706 |
07 Jun 1974 @ 1800 |
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research-mab |
06/07/1974 1655 Visited Arch Steam Vent- definite evidence of eruption w/ hot water in runoff channel. Placed pine-needle marker in runoff channel. {during day - no time noted} |
| 32782 |
02 Sep 1973 @ 1700 |
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research-mab |
09/02/1973 - no specific time noted - Back Basin 5pm - Spring W of Arch Steam Vent very low water found in only 3 of the deepest vents. |
| 32897 |
16 May 1972 @ 1200 |
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research-mab |
05/16/1972 - no time noted - Arch Steam Vent – wish I could have seen it blow 200º
=Pool between Arch Steam Vent and Root pool - 190º |
| 10892 |
14 May 1972 @ 1000 |
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research-mab |
5/14/1972 {generic time}
Arch Steam Vent {1st observations of the season noting destruction from early Oct 1971 eruption~ 1972 Annual report states it was September {disturbance} activity~~~ included here as some readers of the log may assume a May 1972 eruption.} 5-14-72 Lognote: had one heck of an eruption The erosion in this area is impressive – a new hole opened up to the north and is filled with green water. The trail no longer branches back to the feature |
| 10865 |
05 Oct 1971 @ 0000 |
--- |
research-mab |
{Seen and photographed Oct 6. eruption presumed night of Oct 5}
There was no warning at all to the vent change other than a temperature rise of 1°F on September 12th. When it erupted, the vent was enlarged, its shape changed markedly, muddy water coated the trees clear to the top to a distance of over 80 feet from the vent, the log sign identifying Arch Steam Vent was rolled 30 feet down the slope; in addition mud, pine needles, small logs, and the other debris were washed over the boardwalk below the vent, a gully about a foot in depth was eroded into the hillside, and a small pool to the west-northwest served as a catchment basin for part of the runoff but its level dropped around 2 feet from normal. |
| 33147 |
21 Jul 1971 @ 1200 |
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research-mab |
1971- July 21 - no time - steam 93C Not too fast or much noise (189F) |
| 33149 |
29 Jun 1969 @ 1200 |
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research-mab |
1969- June 29 – - no time - no change – trees dead on north side of vent, killed last year. 200°F |
| 33150 |
02 Jun 1968 @ 1200 |
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research-mab |
June 2 1968 - no time - The vent blew up some time this spring. The arch is no longer intact and the trees to the north are dead and covered with gray clay. Clay has also run down the hill on to the trail. |
| 10864 |
02 Jun 1968 @ 0000 |
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research-mab |
Arch Steam Vent June 2 1968 The vent blew up some time this spring. The arch is no longer intact and the trees to the north are dead and covered with gray clay. Clay has also run down the hill on to the trail. |
| 33001 |
11 Sep 1967 @ 1200 |
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research-mab |
09/11/1967 - no time noted - Root Spring full again – The small pools just past Arch have also refilled. 164º |