Last Known Eruption
5y 83d 6h 17m ago

Latest Eruptions

Eruption DurationInterval
24 Apr 2019 @ 1442 ie32y 334d 21h 46m
01 Jun 1986 @ 1656

Interval Statistics

Interval Count1
Min32y 334d 21h 46m
Max32y 334d 21h 46m
Mean32y 334d 21h 46m
Median32y 334d 21h 46m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34229 19 Apr 2024 @ 0908 --- MAB seafoam green with french gray clay color precipitate on the edges - no ripples or side vent action seen
33733 02 Jan 2024 @ 1320 --- JR Turquoise but opaque, slapping water with a bit of bubbling on the rim.
29434 31 Oct 2023 @ 1658 --- MAB seafoam green color with creamy band of suspended sediments at the edges - little vent midway up pool on N side still sputtering and creating ripples but not as strong as seen previously
28905 20 Oct 2023 @ 0800 --- MAB still agitated by the vent halfway up the right side on the edge of the pool
28800 14 Oct 2023 @ 1742 --- MAB Agitated by waves coming from a vent along the edge midway up the pool on the right side
25529 18 May 2023 @ 0905 --- MAB full - green with floaties - French gray color sediments around sides
24522 29 Oct 2022 @ 1805 --- MAB full aqua greenish color with french gray clay color sediments around all sides - slight ripple waves from vent on the west end
24295 07 Oct 2022 @ 1217 --- DanS Jetsam is a colloidal light aquamarine color. Edge spouter not active.
23051 05 Aug 2022 @ 1307 --- cb Jetsam pool is high again. ~3" below overflow & clay colored.
23013 03 Aug 2022 @ 1129 --- cb Pool level has dropped to ~1' below overflow. A weak boil over the far north end of the pool on the edge. color is very watery light brown.
21070 24 Apr 2022 @ 1410 --- DanS Pool in overflow. Small unng on edge of pool not erupting.
21039 18 Apr 2022 @ 1255 --- MAB full cloudy blue with whitish suspended matter on the edges similar to last fall
20173 28 Oct 2021 @ 1521 --- MAB seafoam green color with whitish edges - full
19703 23 Sep 2021 @ 1555 --- cb Water level is all the way up to high water mark and very close to overflow. side vent is active and erupting to 1'. color of water is a aqua blue.
19615 16 Sep 2021 @ 1154 --- cb Jetsam is 1' below rim with the side vent toward the Palm pool splashing to ~1'. And a small new feature below Jetsam in Ledge's runoff channel erupting to 6".
19001 22 Aug 2021 @ 0903 --- MAB cloudy seafoam green in color - full
18766 31 Jul 2021 @ 0839 --- MAB down 1.5ft - still clay brown color - no visible boils
18665 25 Jul 2021 @ 1815 --- cb pool down 3'+
18582 22 Jul 2021 @ 1250 --- Tara Light brown muddy water, down 1.5 feet, bubbling in NW side
18298 06 Jul 2021 @ 0847 --- MAB Down 2 feet!! Still the same odd french gray clay color
17547 07 Jun 2021 @ 0858 --- MAB full enough to flow out west notch - shoulder vent active - strong bubblers on NW edge
16957 29 Apr 2021 @ 1455 --- DanS UNNG at edge of Jetsam erupting.
16927 26 Apr 2021 @ 1122 --- DanS UNNG at edge of Jetsam is active.
16278 26 Sep 2020 @ 1410 --- cb Jetsam pool is high, 3" below overflow
11016 20 Apr 2019 @ 0917 --- MAB Full, a pretty Green color, the shoulder vent erupting gangbusters.
10509 30 Sep 2018 @ 1030 30 Sep 2018 @ 1610 MAB About a foot above water level and a meter south of the existing fracture/spouter, steam was visible in the morning at the farthest end of the depression, in warmer afternoon one could see tiny blips in the water closer to Jetsam in the depression. In other news Jetsam was full and in overflow with slight convection.
9621 10 Aug 2018 @ 1607 --- MAB Side vent active but not as tall as seen previously. Pool is closer to overflow.
9383 01 Aug 2018 @ 1620 --- MAB The vent on the south shoulder of Jetsam is displaying bursts to 3-4 feet! Some stronger than others. Jetsam itself is well below overflow. This seen again around 1715 and walking out 1843
7721 17 Oct 2017 @ 0935 --- MAB Spouter on south rim still active through the day- I think the vent is larger too. Jetsam is full- slight trickle overflow to SW
6291 11 Sep 2017 @ 0930 11 Sep 2017 @ 1800 MAB Water level a bit lower - the spouter on the south (left) rim has enlarged its vent and frequently splashing - some up to 2 feet.
5680 03 Sep 2017 @ 1907 --- srboom Splashing from vent on south side of pool.
5364 24 Aug 2017 @ 1000 --- MAB Spouter on the south rim of Jetsam is quite active - vent area looks enlarged
4213 04 Jun 2017 @ 1600 --- MAB The scummy floating mats that were present on opening have sunk. Jetsam looks hotter with clear water and is overflowing to the south from the west end.
3385 28 Jul 2016 @ 1309 --- MAB Little side vent on the south rim of Jetsam was active today. Also seen IE at 1850. You can hear the wave-slosh inside before water comes out, kinda fun
3150 28 Jun 2016 @ 1003 --- MAB The vent in the center on the south side of Jetsam (above full pool water level) was sputtering to 6-8". Not as much of an 'eruption' as seen on my last visit-but could be worth watching. I didn't make it back there to see it again. Be sure to look there when you drop into Porcelain.
33473 20 Jun 2016 @ 1245 --- MAB Erupt-y vent on the south side, with little splashes to about 1 foot. If you look at Jetsam as elongated roughly East-West, the splashy erupting vent was roughly in the middle of that south side.
29438 11 Jul 2012 @ 0839 --- research-mab 7/11/2012 Pool below Ledge nearly dry 0839 [added as Jetsam]
29903 15 Jun 1999 @ 1400 --- research-mab 6/15 Interesting note: Pool just before Basin Geyser (going down to Porcelain Basin) was empty @2pm on 6/15 – first time I’ve seen it not green & “full”. And at ~4pm going back up I checked it again & it was over full & almost clear – just a little green tinge.
29923 06 Apr 1998 @ 1200 --- research-mab 4/6/1998 - no time noted - Lots of interesting things going on in Porcelain Basin... We have a new thermal feature! A high pressure, super heated steam vent has broken out on the rim of Jetsam Pool. This vent is part of a large group on the side towards Jetsam and several in the runoff of Ledge. The temp is 97.8 C at the vent and the steam is pretty high pressure. Ledge is in a quiet mode. There has been some kind of change in the water though. The growth in the runoff channel is very new. There is also some interesting deposition near the vent.
30051 10 May 1995 @ 1200 --- research-mab Thursday May 10, 1995 - no time noted - Looks like there may be algae growing at Jetsam at least I see green scum on the surface.
30915 08 May 1985 @ 1200 --- research-mab Wednesday May 8 1985 - no time noted - Jetsam was clear and light blue; some water flows from the western lip above Basin G.
7617 11 Feb 1984 @ 1800 --- research-mab 02/11/1984 Jetsam Pool No change in water level due to leakage. Opaque Turbid – light gray brown.
31284 06 Jul 1982 @ 1505 --- research-mab July 6 - approx time - The CHANGE in features occurred between 1230 and 1345 – for both basins - Temperatures taken at 1505-1600 :- Jetsam Pool – 197º, muddy & boiling
31254 20 Feb 1982 @ 1200 --- research-mab February 20 1982 - no time noted - Jetsam Pool 174º blue-green slightly turbid H20 with an occasional bubble
31197 15 Jan 1982 @ 1200 --- research-mab January 15th, 1982 - no time noted - Jetsam Pool 168º blue-green slightly turbid H20 w/an occasional bubble
31584 27 Nov 1981 @ 1200 --- research-mab Nov 27th 1981 - no time noted - Jetsam Pool clear blue water w/slight turbidity, boiling gently 156°
31555 12 Sep 1981 @ 1200 --- research-mab Sept 12 1981 - no time noted - Jetsam 189° 2 sm vents bubbl. 1’ high, gray/grn turbid water
31546 31 Aug 1981 @ 1200 --- research-mab Monday Aug 31 1981 - no time noted - Jetsam Pool turbid greeny-gray 190° 2 bubbling areas of 4” high
31529 17 Aug 1981 @ 1200 --- research-mab Monday 17 August 1981 - no time noted - Jetsam Pool is more active, 1 vent bubbling 8-10” contin.
31795 22 Sep 1980 @ 1200 --- research-mab Monday Sept 22, 1980 - no time noted - One week following the disturbance, some porcelain basin observations: Jetsam Pool – Turbid, bubbling 189ºF
31735 06 Sep 1980 @ 1200 --- research-mab Sat Sept 6 1980 - no time noted - Jetsam Pool Murky grey-green water. No overflow 180°F
31613 08 Jun 1980 @ 1200 --- research-mab June 8 1980 - no time noted - Jetsam Pool – murky blue-grey water, 172ºF
31985 27 Sep 1979 @ 1200 --- research-mab September 27 1979 - no time noted - Jetsam Pool – 196ºF. Water level 3 inches below summer mark. Muddy yellow-brown water.
31930 11 Sep 1979 @ 1200 --- research-mab Sept 11 1979 -no time noted - Temps taken in Porcelain this AM - Jetsam Pool 169°
32234 03 Nov 1978 @ 1200 --- research-mab 11/03/1978 - no time noted - down to close the museum, check signs, etc. Jetsam Pool is nearly empty so maybe Ledge has erupted recently. Big Whirly was active.
32205 13 Sep 1978 @ 1200 --- research-mab 09/13/1978 - no time noted - Jetsam Pool was completely empty today.
32195 09 Sep 1978 @ 1200 --- research-mab 09/09/1978 - no time noted - Jetsam Pool- grey water – down 8 inches from rim Temperature 158ºF
32185 03 Sep 1978 @ 0930 --- research-mab 09/03/1978 - Yesterday water in nearby Jetsam down ~2 feet. This am at 930 hrs down only a few inches. Water spray out of Ledge’s NW vent out to ~20 feet
32158 18 Aug 1978 @ 1200 --- research-mab 08/18/1978 - no time noted - Jetsam Pool has filled up again along with a refilling of vents associated with Ledge- this may add additional evidence that Jetsam is connected to Ledge. [added: Ledge overflows into Jetsam]
32152 12 Aug 1978 @ 1200 --- research-mab 08/12/1978 - no time noted post Ledge - Also of note water in Jetsam Pool has increased about 1-2 feet in depth while the power of our new unnamed fumerole (Son of Black Growler) seems to have decreased.
32110 22 Jun 1978 @ 1200 --- research-mab 06/22/1978 - no time noted - Water in Jetsam down about a foot from last year.
32300 19 Aug 1977 @ 1200 --- research-mab 08/19/1977 - no time noted - -More observations made in the Porcelain Basin once the fog was burned out: Congress boiling more, Porcelain Terrace Springs seen to be putting out more steam, the features between and including Feisty and Blue Geyser are all muddy. Colloidal boiling in several spots. Jetsam with strong boiling.
5107 30 Jun 1977 @ 1800 --- research-mab 06/30/1977Jetsam pool has turned into a Sulphur Cauldron today – almost yellow. The mud pot out by Lewis mudpot has gone completely dry.
32561 10 Sep 1976 @ 1200 --- research-mab 09/10/1976 - no time noted - Jetsam – nearly clear again – very blue. Still bubbles
32543 07 Sep 1976 @ 1200 --- research-mab 09/07/1976 - no time noted - Jetsam – back to its usual blue-green color
32536 04 Sep 1976 @ 1200 --- research-mab 09/04/1976 - no time noted - Jetsam pool is faintly green, still bubbling.
32501 27 Aug 1976 @ 1200 --- research-mab 08/27/1976 - no time noted - Jetsam Pool (?) was boiling intermittently this afternoon {? mark in log}
32500 24 Aug 1976 @ 1930 --- research-mab 8-24-1976 - approx time - While walking in Porcelain last night (8-24} at sunset the following activity was observed:1) Jetsam Pool is fluctuating a few inches fills-boils-overflows-recedes
32468 05 Aug 1976 @ 1200 --- research-mab 08/05/1976 - no time noted - Jetsam Pool as clear as I’ve ever seen it.
32431 20 Jul 1976 @ 1200 --- research-mab July 20 1976 - no time noted - Porcelain Basin observations in pm: Jetsam Pool is still muddy, bubbling with some runoff.
32427 19 Jul 1976 @ 1200 --- research-mab July 19 1976 - no time noted - Felt what might have been a tremor over at the housing area at 1145 am. There was a low rumble accompanied by a slight snaking & vibrating of the transahome. {A sneeze would shake that place} - Jetsam Pool has become very cloudy. It is bubbling & muddy.
5681 02 Sep 1975 @ 1800 --- research-mab 09/02/1975 Jetsam Pool – down one foot in water level, Pool is turbid.
5661 29 Aug 1975 @ 1800 --- research-mab 08/29/1975 Jetsam down 18”
5662 28 Aug 1975 @ 1200 --- research-mab 08/28/1975 - no time noted - Jetsam down 2’
32660 20 Aug 1975 @ 1900 --- research-mab 08/20/1975 - approx time no time noted - Porcelain Basin 7:00 p.m. - Jetsam Pool – Turbid 180º
32634 16 Jul 1975 @ 1200 --- research-mab July 16 1075 - no time noted - Jetsam Pool – water level almost recovered within 1 inch of crust.
5605 09 Jul 1975 @ 1800 --- research-mab 07/09/1975 Jetsam down 2’ (since tremors)
32613 05 Jul 1975 @ 1200 --- research-mab 07/05/1975 - no time noted - Jetsam pool is also very low.
6179 22 Sep 1973 @ 1200 --- research-mab 09/22/1973 - no time noted - Congress blue color. Jetsam - clear & green
6138 11 Sep 1973 @ 1200 --- research-mab 09/11/1973 - no time - Jetsam Pool has returned to a green color.
6084 26 Aug 1973 @ 1800 --- research-mab 08/26/1973 Jetsam pool still grey
6070 20 Aug 1973 @ 1800 --- research-mab 08/20/1973 Jetsam Pool is gray instead of Turquoise.
32732 18 Mar 1973 @ 1200 --- research-mab 03/18/1973 - no time noted - Jetsam Pool Little bubbling in center, continuous discharge 171°
6457 10 Sep 1972 @ 1800 --- research-mab 09/10/1972 Jetsam Pool – the bubbling activity has ceased on the NW half of the pool & has shifted to the SE. Also, the dark gray runoff channel is being coated in part by a light pinkish flesh colored deposit.
33256 10 Aug 1972 @ 1200 --- research-mab Jetsam - no time noted - Grey water after Aug 9
6504 15 May 1972 @ 1800 --- research-mab 05/15/1972 Jetsam – milky greenish grey, bubbling 193º
33260 15 May 1972 @ 1200 --- research-mab 1972 May 15 - no time – 193F Green – clear water, very little bubbling & little overflow
32942 11 Sep 1971 @ 1800 --- research-mab 09/11/1971 - {afternoon temps 1430-1900} - Jetsam 196° muddy dull gray color, more bubbling, much less runoff
6583 09 Sep 1971 @ 1800 --- research-mab 09/09/1971 In the evening a tour was made of the basins and additional changes were noted: The water level in Jetsam pool has dropped a little over an inch and as a result, there is less than half the runoff that there was for the past month. {evening observations}
6578 09 Sep 1971 @ 1200 --- research-mab 09/09/1971 Jetsam is now a light gray instead of the beautiful sky blue that it has been for many weeks. Also the activity in the pool seems to have increased. {morning}
6562 31 Jul 1971 @ 1800 --- research-mab 07/31/1971 Jetsam Pool is having a lot more runoff and is becoming a more clear light blue color.
33259 31 Jul 1971 @ 1200 --- research-mab 1971 July 31 - no time - Blue opal color water – no eruptions like last year. Water overflowing to west. Boiling action 92C (197F)
6560 22 Jul 1971 @ 1800 --- research-mab 07/22/1971 Other changes have been noticed around Ledge & Valentine Geyser; one is that the hole in the side of the hill west of Valentine is larger with water in the bottom of it; Jetsam Pool has a greater discharge (over 2X than before the eruption of Ledge, also the point of greatest boiling has shifted in part from east of center to the north west edge and then shifted back again.
6597 07 Sep 1970 @ 1800 --- research-mab 09/07/1970 Jetsam pool has been starting to clear up in the past couple of weeks,
6618 01 Sep 1970 @ 1300 --- research-mab 09/01/1970 A survey of pools and geysers in the area made during the {Ledge} eruption showed that Jetsam Pool had a larger volume (3 times) of run-off than usual. Basin was about completely drained with a small amount of water splashing about in the bottom of its fissure. As I write this at 3:55 there is still a considerable amount of steam still emerging under pressure from the Ledge geyser.
6612 15 Jul 1970 @ 1800 --- research-mab 07/15/1970 Jepsam pool {Jetsam} is full again, the heavy bubbling activity has shifted toward the middle & east end & the surface has an oily texture.
6611 14 Jul 1970 @ 1800 --- research-mab 07/14/1970 Jepsam pool {Jetsam} is becoming slightly more active like in June. The water level of the pool which had been practically full for the past couple of weeks appears to have dropped 2-3 inches since yesterday.
33257 30 Jun 1970 @ 1200 --- research-mab June 1970 - no time - Jetsam must be getting heat that was at Ledge Geyser last year. Jetsam has changed from a placid green-blue pool to a gray muddy geyser-like spring. The geyser activity has thrown water up to 10 & 15 feet into the air- much muddy water has been put into the drainage, from the Porcelain Basin. [NOTE no date included in Thermal Record ~ EOM]
6608 21 Jun 1970 @ 1800 --- research-mab 06/21/1970 {Jetsam} is very full but height of eruption down. {no time}
6607 20 Jun 1970 @ 0730 --- research-mab 06/20/1970 Jepsam pool {Jetsam} up to level which covers the pool floor. Porcelain drainage stream below it was very muddy again.
No attachments for this geyser.
Baseline does not exist.