Last Known Eruption
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Latest Eruptions

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Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
33931 26 Jan 2024 @ 1531 --- JR Strong roil in cave, bubbling throughout.
29027 22 Oct 2023 @ 0903 --- SantaFe108 Steam obscured, audibly splashing inside the cave. Both pools leading out of the cave boiling. Gray Lakes are obscured by steam.
28973 21 Oct 2023 @ 1532 --- JR Nice strong bubbling throughout. Most roiling is in cave.
28923 20 Oct 2023 @ 1558 --- MAB strong boil w clear water to 1ft way back in the cave and another closer to the opening - boil in the pool closest to viewing area 4inch boil also clear - vent to sw same - the farther reaches of Gray Lakes quiet
28877 19 Oct 2023 @ 1153 --- DanS Vigorous active boiling from at least five points in pool. Cave vent added low splashing.
29679 01 Oct 2023 @ 1025 --- research-mab 10/01/2023 - 1025am Green Dragon front pool was bubbling. Vigorously in the cave.
28502 26 Sep 2023 @ 1708 --- MAB strong upwelling with clear water in 3 areas including in the cave
27291 28 Jul 2023 @ 2028 --- SantaFe108 Clear and loudly boiling in two spots within the cave. Quietly boiling in both pools leading out from it.
26410 17 Jun 2023 @ 1517 --- SantaFe108 Clear with heavy bubbling in pool closest to cave, other two pools leading outward are lightly bubbling.
25862 28 May 2023 @ 1955 --- SantaFe108 Clear with heavy bubbling in pool closest to cave, other two pools leading outward are lightly bubbling.
25660 21 May 2023 @ 1426 --- SantaFe108 Clear with big bubbles from the pool closest to the cave. Other two pools leading outward are lightly bubbling.
25465 15 May 2023 @ 1919 --- ypcaribou Clear. Looks browner in pool lining than I recall. Sandhill cranes heard as I type this.
24405 15 Oct 2022 @ 0945 --- MAB connected pools 1 2 and 3 all with boils - boil in cave reaching up to 10in with mostly clear water
18326 09 Jul 2021 @ 1318 --- MAB steady clear boil in 3 places - next Gray Lake is blue with 1 boil spot and barely connected - noted that the hotter westerly one is only leaking into the pool adjacent to Green Dragon and is not flowing down towards Porkchop and the logger tho it does have a channel that meets with the other one - looks like it did overflow down that channel earlier this season
17725 12 Jun 2021 @ 1610 --- MAB Fairly calm one good boil in cave - clear - barely connnected to Gray Lakes- the 1st Gray Lake immediately west is hot blue and boiling
16824 24 Jan 2021 @ 1414 --- markwolf possible increased runoff flow from here and gray lakes into Tantalus
15696 23 Aug 2020 @ 0710 --- ypcaribou Clear, greenish blue
29160 30 Jul 2020 @ 1200 --- research-mab 7/30/2020 - no time noted - Charred ground btw Black Hermit and Green Dragon 46-48C
29155 12 Jul 2020 @ 1200 --- research-mab 7/12/2020 - no time noted - Charred ground between Black Hermit and Green Dragon Spring is hot and expanding! Need to bring temp tool out there
12890 31 Jul 2019 @ 0903 --- cb pool is light brown in color. In the cave there is a very vigorous roiling boil to 8". 3 pools within the main pool have fairly vigorous boiling also. runoff at the bridge is clear.
12842 28 Jul 2019 @ 0716 --- ypcaribou Clear & green
29122 05 Jul 2019 @ 0730 --- research-mab 7/5/2019 730-830 Cistern is dry. Took thermal IR images of trail between Black Hermit and Green Dragon.
29120 02 Jul 2019 @ 1200 --- research-mab 7/2/2019 - no time noted - The dirt trail between Black Hermit Caldron and Green Dragon Spring is heating. Ground cover on both sides of the trail is charred. This area smells sweet like syrup. {arrow -→} TAPP team measured ground at 130°F
11855 17 Jun 2019 @ 0853 --- udo Clear and quiet
11001 19 Apr 2019 @ 0001 --- ypcaribou Water is muddy per facebook comment. Time unknown.
9845 22 Aug 2018 @ 1739 --- WillBoekel GDS has clear water running in its channels and the brown that had coated the channels from the disturbance is turning white and green.
19288 15 Jul 2018 @ 1825 --- research-mab 7-15-2018 CB GREEN DRAGON 1825 See Note under Steamboat Vixen platform & runoff channel is wet, water pooled in its tube but I did not see an eruption in the 15 minutes I observed. Pearl still has a yellow hue. Porkchop water is back up to the rim of the pool. Green dragon runoff is again clear however the runoff channels are coated in brown. Yellow funnel has no visible water but I can hear deep grumbling with splashing down deep. Echinus water level is good with nice runoff and a weak 2 vent boil. (hum!) Crater Spring water is LOW and murky brown/gray. Emerald Spring is the same, clear, green with weak convection waves. https://geysertimes.org/note.php?id=9202
19274 27 Jun 2018 @ 1800 --- research-mab 6-27-2018 GREEN DRAGON – 1800 CB see Note under Steamboat Vixen is back to more regular play. The steam vent by Vixen is quieter. Pearl has bubbles breaking the surface. Pork chop is down about 4" from the rim. Green dragon is putting out chocolate brown runoff. Yellow funnel is way low, muddy brown and turbulent. Blue mud steam vents water/mud is not visable. Crater Spring water level is low as is Echinus. Echinus run off channel is dry in many areas. This back basin is much the same as last night except for Vixen. sorry for the long note! Forgot about Emerald. . . cuz it is the same! Boiling in the East thumb, green and fairly clear. https://geysertimes.org/note.php?id=8912
29638 02 Oct 2017 @ 1200 --- research-mab 10/2/2017 - no time noted - Green Dragon looks very similar today to what it did on 9/23. (It had less steam today than, say, 9/27, so its fountains became more visible once again.)
29632 27 Sep 2017 @ 1200 --- research-mab 9/27/2017 - no time noted - Green Dragon is still splashing and muddy. It is also emitting large amounts of steam – the most steam I’ve yet seen from the Dragon. Echinus is very steamy too. Lots of steam coming from the features between Vixen and Porkchop as well - Also, Green Dragon doesn’t stink as much as it normally does. More water vapor and less H2S?
29630 23 Sep 2017 @ 1435 23 Sep 2017 @ 1500 research-mab 9/23/2017 I returned to Green Dragon 1435-1500. - It continues to splash vigorously, effectively acting as a short fountain geyser. I will sketch out its several fountains below. (Also I shot some video) Heights are my estimations.
29629 23 Sep 2017 @ 1000 --- research-mab 9/23/2017 Green dragon Spring is brown and muddy, has fountains of muddy water rising. - 176°F at Springs outer edge (measured with our thermometer gun) The other Back Basin features are similar to yesterday except Pearl seems not quite as active – though we need to watch it more to confirm. I witnessed all this on the 930-11 guided walk. {approx time entered}
29619 01 Aug 2017 @ 1200 --- research-mab 8/01/2017 - no time noted - Green Dragon’s water level seems to be up.
29436 15 Jul 2012 @ 1200 --- research-mab 7/15/2012 - no time noted - Quite a number of changes after last two days rainstorms - Water in Green Dragon Spring, “drain”, and Gray Lakes higher. Water entering “drain” from both sides
29418 28 Jun 2012 @ 0900 --- research-mab 6/28/2012 Observed changes since 6/24 :- (seen on rove 0800=0930) - No inflow to “drain” at Green Dragon Spring.
29415 21 Jun 2012 @ 0901 --- research-mab 6/21/2012 Green Dragon Spring water level fell overnight. No water from Spring flowing into drain pool now. Only a trickle entering from Gray Lakes. - numerous gas bubbles surfacing in Gray Lakes. No visual due to steam, but ripples and waves at edge of water. RP 0900
29411 20 Jun 2012 @ 1200 --- research-mab 6/20/2012 - no time noted - Water level in Green Dragon Sp[ring “drain” pool about 10” lower than yesterday.
29412 20 Jun 2012 @ 1200 --- research-mab 6/20/2012 - no time noted - Gray Lakes by Green Dragon is erupting 1 ½ – 2 ½ ft.
29408 29 May 2012 @ 1200 --- research-mab - no time noted - Yesterday, 5/29/12, I observed brown foam floating on the drain pool at Green Dragon Spring. The foam was not in the Spring itself or on the Gray Lakes.
29386 26 Aug 2010 @ 0918 --- research-mab 8/26/2010 Gray Pools 0918 ie Heavy steam, waves, strong overflow {Rich H and Bruce J in log - see also full writeup in Gosa SPUT Oct 2010 Vol 24, No 5 “VIXEN GEYSER DURING THE NORRIS DISTURBANCE OF AUGUST 26, 2010)
29381 16 Jul 2010 @ 1200 --- research-mab 7/16/2010 - no time noted - All – please make note of any changes you are seeing in the basin – especially w/ disturbance influenced features. Today it seemed to me that Emerald and Cistern were surging more violently than before. Echinus seems to have become more murky. Gray Lakes seems to be surging pretty heavily. From Mystic Spring to Puff and Stuff, water levels seem to have dropped, waters appear more turbid, and surging seems heavier. Yellow Funnel’s water is very low and turbid, perhaps will become steam vent? Son of Green Dragon seemed (from the boardwalk) empty and was chugging steam. Sagebrush Springs seemed wetter, and I noticed no change w/Pearl.
29371 26 Jul 2009 @ 1200 --- research-mab 7/26/2009 - no time noted - I noticed from 8/23/08 note that “Middle Pool” from Green dragon was overflowing/boiling. Does anyone know how long that pool (second to the right from Green Dragon) has been filling from both sides and (presumably) draining, from the bottom? (As it is now)
29354 30 May 2009 @ 1200 --- research-mab 5/30/2009 - no time noted - Disturbance? Emerald boiling, Echinus has boiling, Porkchop small splashes. Back part of Back Basin, water levels low, murky and surging. Yellow Funnel and Green Dragon only have steam.
29778 30 Aug 2007 @ 1200 --- research-mab 8/30/2007 .- no time noted - Green Dragon Spring – water level dropped (from Tuesday's observations) about 6+ inches and water changed from bluish green to dark gray. Large pool of Green Dragon erupting about 3-5 feet (difficult to see through the steam, so it could’ve been taller). Muddy overflow of the big pool was draining into Tantalus Creek, turning it muddy also.
30089 29 Jul 1995 @ 1200 --- research-mab 7/29/1995 - no times noted - Disturbance has arrived!!! Green Dragon – Erupting from the “mouth” vent, All vents boiling muddy brown T-86 pH 3.20 All springs around to Echinus have heavy boil and some are muddy pH’s around 3.0. Echinus has gone crazy. Intervals are from 10 m to 1 hour.
30165 07 Aug 1994 @ 1200 --- research-mab 8/7/1994 - no times noted - It seems the time has come for our Mjr annual disturbance...Grey Lake also Muddy & boiling vigorously Green Dragon also boiling & muddy
30306 21 Sep 1993 @ 1200 --- research-mab 9/21/1993 no time noted - Water levels are down in Phillips Cauldron which has muddy bubbles, Green Dragon Spring, (Yellow Funnel water level is right up near the rim), Mystic Spring and Root Pool. Root pool has mud showing. Green Dragon does too & so does Grey Lakes.
30272 24 Aug 1993 @ 1200 --- research-mab 8/24/1993 - no times noted - Other signs of disturbance (albeit mild} - Green Dragon is chocolate brown as are Gray Lakes
30410 29 Jul 1992 @ 1800 --- research-mab 7/30/92 a.m.- inferred est.times "last night" {29th} - Yellow Funnel down about 5’. Green Dragon isn’t quite as dark as it has been recently.
30398 29 Jul 1992 @ 1200 --- research-mab 7/29/92 - no time noted - Closed trail shows a great deal of sulfur residue near Butch Geyser, Green Dragon.
30395 28 Jul 1992 @ 1200 --- research-mab 7/28/1992 - no time noted - Green Dragon is extremely muddy & boiling very violently. Black Hermit Cauldron is no longer boiling and it is beginning to clear up.
30355 10 Jul 1992 @ 1200 --- research-mab 7/10/92 - no time noted - Green Dragon Springs is draining toward Gray Lakes. There is very little runoff from Grey Lakes & Green Dragon
30328 26 Apr 1992 @ 1200 --- research-mab 4/26/1992 - no time noted - Green Dragon – green, rapid, steady boil
30582 05 Aug 1991 @ 1200 --- research-mab 8/5/91- no time noted - Green Dragon & Son of Green Dragon green again.
30496 16 May 1991 @ 1200 --- research-mab 5/16/1991 - no time noted - Green Dragon – new walkway cut here is safer but sure hacked up “hobbit forest” pH 4 temp 199°F - constant rapid boil in all vents, brownish green.
30757 28 Sep 1989 @ 1200 --- research-mab 9/28/1989 - no time noted - Green Dragon now back to clear, gray-green.
30739 08 Sep 1989 @ 1200 --- research-mab 09/8/1989 - no time noted - Green Dragon Spring is very dark chocolate brown.
30834 08 Aug 1988 @ 1200 --- research-mab 8/8/1988 - no time noted - Green Dragon Spring has two boiling vents external to the cave.
30823 06 Aug 1988 @ 1200 --- research-mab 8/6/1988 - no time noted - Green Dragon Spring – water level down 2-3”; 2 small bubblers (~6” total) {← unclear about word total-mab} Looks like the eyes on a mask.
30789 03 May 1988 @ 1200 --- research-mab May 3 1988 - no time noted - Green dragon Sp is clear water with upwelling to 1’ out of its… pools, it’s ‘cave’ vent sounded vigorously active but it was too steamy to see in.
30861 26 Jul 1987 @ 1200 --- research-mab 7/26/1987 - no time noted - Green Dragon – still brown, turbid, boiling
30857 12 Jul 1987 @ 1200 --- research-mab 7/12/1987 no times noted - noteworthy basin changes of the past several days: Basin Wide Disturbance !!?? Green Dragon spring muddy with upwelling > 1 foot.
33428 06 Oct 1986 @ 1200 --- research-mab October 6, 1986 - no time noted - *GREEN DRAGON is very brown and muddy, with the two pools in front boiling very strongly.
30931 01 Jul 1985 @ 1200 --- research-mab Monday July 1 1985 - no time noted - Also- Green Dragon was “erupting” at about 4 ft ht- is this normal? Palpitator Spring is dry?
31097 21 May 1983 @ 1200 --- research-mab May 21 1983 – no time noted ~afternoon - Green Dragon – Brown, muddy. Boiling from 2 points in the pools outside the cave as well as splashing up 2 feet from the cave nearly constantly.
31306 08 Jul 1982 @ 1200 --- research-mab 7/8/1982 - “About 1200” - Green Dragon Spring – opaque, muddy, splashing boil from 2 front pools, heavy splashing in cave. Boiling looks superheated.
31234 20 Feb 1982 @ 1200 --- research-mab February 20 1982 - no time noted - Green Dragon Spring – dark blue-grey H2O that is much clearer than normal. Back Pool- 196° - Middle Pool - 186° , Front - 172° ,
31179 14 Jan 1982 @ 1200 --- research-mab January 14th 1982 - no time noted - Green Dragon Spring dark green-brown turbid H20 1st pool - 166° ; 2nd - 180° ; 3rd – inacessible
31517 14 Aug 1981 @ 1200 --- research-mab 14 Aug 1981 - no time noted - Green Dragon – turbid gray brown, boiling heavy from cave and 2 pools in front
31466 02 Aug 1981 @ 1200 --- research-mab Sunday August 2 1981 - no time noted - Green Dragon Spring splashing to 4-5’ 198° {sketch of 3 pools 198°- 182°- 170°} gray opaque turbid water, slight increase in boil
31414 06 Jun 1981 @ 1200 --- research-mab Saturday June 6 1981 - no time noted - Green Dragon Spring- Muddy gray-green. Cave vent very active – erupting 2 to 3 feet
31766 16 Sep 1980 @ 1200 --- research-mab Tuesday September 16, 1980 - no time noted - Green Dragon – changed to brown opaque water {sketch with temps 198° in cave to 175° to west w/ “boiling in cave to 2 feet}
31714 23 Aug 1980 @ 1200 --- research-mab Saturday August 23 - no time noted - Green Dragon Spring – Slightly turbid, overflowing, green color {sketch temps from 179-201°) vent at cave erupting 1-3 feet
32009 28 Sep 1979 @ 1200 --- research-mab September 28 1979 - no time noted - Green Dragon – 176º Pool furthest from vent, 198º under cave, still boiling….
31965 21 Sep 1979 @ 1200 --- research-mab Friday September 21 1979 - no time noted - More end of summer changes! Green Dragon Spring – Lost all green color and changed to an opaque tan brown, although not as dark as last year. Boiling vigorously in each pool, strongest (2-3 feet) in cave. 199ºF in cave, 189 in pool furthest from cave.
31902 17 Aug 1979 @ 1200 --- research-mab Aug 17 1979 - no time noted - Green Dragon Spring – 182º – S.W. pool - 201ºF -boiling vent next to cave
31866 11 Jul 1979 @ 1200 --- research-mab July 11 1979 - no time noted - Green Dragon is very grey.
32229 28 Sep 1978 @ 1200 --- research-mab 09/28/1978 - no time noted - Green Dragon murky
32212 15 Sep 1978 @ 1200 --- research-mab 09/15/1978 - no time noted - ...basin wide disturbances continue! - Green Dragon Springs – water remains a deep chocolate brown. Vent closest to trail is forming a deep, undercutting cave. Trail logs moved back 2 feet. {Temps and sketch}
32208 14 Sep 1978 @ 1200 --- research-mab 09/14/1978 - no time noted - Green Dragon has become dark brown.
32052 25 Mar 1978 @ 1200 --- research-mab March 25 1978 - no time noted - Green Dragon Spring – walls of the cavern are very green. Pool full, clear green, and bubbling moderately.
32312 21 Aug 1977 @ 1200 --- research-mab Aug 21 1977 - no time noted - Yellow Funnel is brown. Green Dragon is brown.
32303 19 Aug 1977 @ 1200 --- research-mab 08/19/1977 - no time noted - changes- The three vents of Green Dragon Spring are all more active than usual and Black Hermits is down, and boiling vigorously. Mud Spring is opaque and still retains its color. Decker Geyser is boiling in many spots. Emerald Spring has extended its area of boiling along the edge parallel to the trail and is murky.
32584 17 Sep 1976 @ 1200 --- research-mab 09/17/1976 - no time noted - Green Dragon Spring – south pool has a very large spouting area. It’s about 1 meter in diameter & erupts up to heights of 2-4’.
32567 14 Sep 1976 @ 1200 --- research-mab 09/14/1976 - no time noted - Green Dragon Spring – still very murky, boiling still very active in the main pool area.
32559 10 Sep 1976 @ 1200 --- research-mab 09/10/1976 - no time noted - Green Dragon Spring – chocolate brown color, with many new patches of boiling.
32514 31 Aug 1976 @ 1200 --- research-mab 08/31/1976 - no time noted - Green Dragon – now brown
32480 15 Aug 1976 @ 1200 --- research-mab 08/15/1976 - no time noted - Root Pool and Green Dragon Spg & Muddy Spg. Both bubbling quite vigorously and quite turbid. A call to Old Faithful visitor center verified the hypothesis that the park had a slight tremor which caused the aforementioned change in B. Basin Spg activity.
32429 20 Jul 1976 @ 1200 --- research-mab July 20 1976 - no time noted - The pools in Back Basin have undergone a color change. Tangle Root Spring is very clear & able to see to bottom. Green Dragon is very muddy, as is Black Hermit’s Cauldron. Muddy Sneaker spouter is putting out gray matter.
32659 17 Aug 1975 @ 1200 --- research-mab 08/17/1975 - no time noted - Green Dragon Spring appears to be clearing somewhat.
32712 14 Aug 1974 @ 1200 --- research-mab 08/14/1974 - no time noted - Green Dragon – Very muddy & active
32873 30 Sep 1973 @ 1000 --- research-mab 09/30/1973 10:00 am Back Basin - “Normal” activity noted except for muddiness in Yellow Funnel, Green Dragon, Mystic, Phillips still a little low (~2”)
32870 28 Sep 1973 @ 1000 --- research-mab 09/28/1973 - Back Basin 1000 am Water levels normal though water is still murky in Green Dragon, Yellow Funnel, Mystic
32780 02 Sep 1973 @ 1115 --- research-mab 09/02/1973 - no specific time noted - Back Basin at 1115am - Water levels low in Mystic (fairly clear), Mud Spring (fairly clear- down ~ 1’), Yellow Funnel Spring (muddy), pool area (w/mud) to NE of Dishwater Spring, Green Dragon (still a couple of inches down & churning muddy), Pearl Spring w/little runoff; Bathtub;
32774 01 Sep 1973 @ 1700 --- research-mab 09/01/1973 - no specific time noted - Back Basin 5pm- Green Dragon very muddy and very actively boiling
32762 29 Aug 1973 @ 1200 --- research-mab 08/29/1973 - no time noted - Back Basin @ 8:am ~ Green Dragon is still brown; water level down in Mystic Springs (sev inches), and down in Spring to S.W. (maybe ½’).{Mud Spring? mab}
32747 20 Aug 1973 @ 1200 --- research-mab 08/20/1973 - no time noted - Back Basin Features showing agitated muddy condition. Green Dragon Spring, Double Bulger, Yellow Funnel Spring, Mystic Spring, Emerald Spring (brownish-green color); Palpitator Spring has no water;
32744 18 Aug 1973 @ 1200 --- research-mab 08/18/1973 - no time noted - Numerous features in BB are bubbling violently, especially Root Spring, Green Dragon, Phillips Cauldron, various points along Tantalus Creek & Emerald Spring.
33230 16 May 1972 @ 1200 --- research-mab 1972 May 16 - no time - 192F “Boiling” water in two pools in the front of the cave. Water a gray brown with little overflow green-yellow sulfur on formation around cave opening.
32969 02 Oct 1971 @ 1200 --- research-mab 10/02/1971 - no time noted - Green Dragon Spring – still violent, shooting 3-5’
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Baseline does not exist.