| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 40190 |
02 Jul 2025 @ 2048 |
--- |
cb |
tree island Geyser is NOT active |
| 40134 |
28 Jun 2025 @ 1923 |
--- |
MAB |
NGB: Tree Island G not IE |
| 40133 |
28 Jun 2025 @ 1857 |
--- |
MAB |
NGB: New Thing NNW of Black Pit- IE on right and center areas - steady one inch ribbon of water coursing thru the sands below and reaching the boardwalk |
| 40117 |
28 Jun 2025 @ 1459 |
--- |
MAB |
NGB: high pressure vent in Milky Complex still cooking |
| 40114 |
28 Jun 2025 @ 1220 |
--- |
MAB |
NGB: Tree Island G not IE |
| 40097 |
28 Jun 2025 @ 0932 |
--- |
aferrara |
Muddy spring at North West end of Mary Bay thermal features jetting narrow stream of mud about three feet high, stopped before 1015. |
| 40106 |
28 Jun 2025 @ 0832 |
--- |
MAB |
NGB: Tantalus Creek at the bridge fairly muddy - will edit if I see something at Tantalus Geyser this afternoon |
| 40105 |
28 Jun 2025 @ 0826 |
--- |
MAB |
NGB: New Thing NNW of Black Pit vigorous splashing center and right side- slightly cloudy water and wet sands and gravels below |
| 39987 |
21 Jun 2025 @ 1514 |
--- |
aferrara |
are collapsing spring and pool the same thing? West Thumb collapsing blue and steadily boiling all over above vent |
| 39986 |
21 Jun 2025 @ 1511 |
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aferrara |
blue, still water |
| 40163 |
21 Jun 2025 @ 0900 |
--- |
JarnoO |
(generic time): "On the morning of Saturday, June 21, visitors at Grand Prismatic Spring in Yellowstone National Park observed a bison slip into a shallow part of the hot spring. Clearly alarmed by the hot water—up to about 89 °C (192 °F), which is just below boiling temperature at that elevation—the animal stumbled as it tried to get out and ended up stepping into an area of deeper water and quickly perished.
Yellowstone National Park officials decided not to remove the carcass. [...]" |
| 39970 |
20 Jun 2025 @ 1813 |
--- |
MAB |
NGB: New Thing NNW of Black Pit - more visible from steps - increased gravels pushed towards path with splashing seen on right side AND in middle of the feature |
| 39944 |
20 Jun 2025 @ 0830 |
--- |
MAB |
NGB Tree Island G not IE |
| 39941 |
20 Jun 2025 @ 0812 |
--- |
MAB |
NGB: don't usually make Notes for Milky Complex but sm thing by stairs bubbling - larger feature mid stairs water level lower than last week and mud pot type feature behind it a hissing high pressure steam vent |
| 39934 |
19 Jun 2025 @ 1054 |
19 Jun 2025 @ 1115 |
steve |
Iris (or what I think is Iris)is having one to three small splashes every few seconds to every one to two minutes. |
| 40028 |
19 Jun 2025 @ 0929 |
--- |
Siegmund |
Old Bellefontaine Geyser: crater empty, gently puffing steam. |
| 39865 |
13 Jun 2025 @ 1832 |
--- |
MAB |
NGB: New Thing NNW of Black Pit crater seems enlarged now splashing muddy water on the right side towards Black Pit |
| 39840 |
13 Jun 2025 @ 0941 |
--- |
MAB |
NGB Tree Island G not IE although Whirligig is getting water from somewhere - seen from above w less steam @1148 wash area around it has chunks of sinter |
| 39832 |
13 Jun 2025 @ 0833 |
--- |
MAB |
NGB: New Thing NNW of Black Pit more gravels washed on left side below crater past boardwalk- also a clear hot spot more North under some bison pies - have flir |
| 39831 |
13 Jun 2025 @ 0832 |
--- |
MAB |
NGB: Bubbling Bog still steaming but didn't hear boils or fry pan noises - flir shows warm water not flowing thru grasses towards boardwalk |
| 39760 |
08 Jun 2025 @ 1844 |
--- |
MAB |
NGB: Bubbling Bog NW of new thing may not be pushing warm waters thru the grasses now per FLIR- will check again on a cool morning |
| 39759 |
08 Jun 2025 @ 1840 |
--- |
MAB |
NGB: New Thing NNW of Black Pit- thin stream of water now coursing thru the original gravels on left side below the feature with gravels reaching the path - don't know if more gravels came out or if water just pushed them farther down. |
| 39738 |
08 Jun 2025 @ 0815 |
--- |
MAB |
NGB: Milky Complex water level down - incl dry Owl Eyes - except Cat Eye IE very vigorous though |
| 39735 |
08 Jun 2025 @ 0813 |
--- |
MAB |
NGB: Tree Island looks full very steamy but not IE - low low Whirligig prob confirms it's been a bit |
| 39698 |
05 Jun 2025 @ 1918 |
--- |
MAB |
NGB: Tree Island G NOT IE |
| 39697 |
05 Jun 2025 @ 1823 |
--- |
MAB |
NGB: Bubbling Bog N of new thing and SSE of Steamboat trough still audibly bubbling with warm water coursing through the grasses towards the path - ALSO the spring slope open area just past it {towards Echinus} shows more seepage and green algaes - and mosquitoes |
| 39696 |
05 Jun 2025 @ 1817 |
--- |
MAB |
NGB: New Thing NNW of Black Pit - more visible from steps above Black Pit - strong center splashing - waters run towards path directly below crater - some gravels have been dislodged but it hasn't broken through the gravel rim - will study pics to see if it enlarged on right side |
| 39588 |
31 May 2025 @ 1751 |
--- |
mhreed |
Black Hermit Cauldron. Low water level, thick, muddy, and boiling. |
| 39507 |
29 May 2025 @ 1848 |
--- |
MAB |
NGB: Tree Island G still not IE |
| 39503 |
29 May 2025 @ 1836 |
--- |
MAB |
NGB: Bubbly Bog still making sizzle noises and pushing warm water down to and under bwalk - skeeters found me too |
| 39502 |
29 May 2025 @ 1825 |
--- |
MAB |
NGB: New Thing 70' NNW of Black Pit- splashing now visible from steps at Black Pit - splashing more from center than left side |
| 39483 |
29 May 2025 @ 1333 |
29 May 2025 @ 1645 |
MAB |
NGB: Tree Island G not IE |
| 39472 |
29 May 2025 @ 0820 |
29 May 2025 @ 1244 |
MAB |
NGB: Tree Island G not IE |
| 39332 |
24 May 2025 @ 1853 |
--- |
MAB |
NGB new thing NNW of Black Pit: Crater seems same size - water below bwalk definitely comes from the channel on the other side of the tree not just below the crater - still actively splashing - larger splashes on left side |
| 39331 |
24 May 2025 @ 1850 |
--- |
MAB |
NGB: New bubbling Bog thing more like noisy bubbles and fry pan noises than this morn- could not see water going down slope as seen w steam and FLIR this morn - lg pine just behind w red needles - EDIT after examining photos - there is only one viewpoint where you can see the channel in the grass - that flow comes from the area on the right not the more open area on the left |
| 39327 |
24 May 2025 @ 1511 |
--- |
MAB |
NGB: Tree Island G not erupting |
| 39312 |
24 May 2025 @ 1310 |
--- |
TSBryan |
"White Sand Spring" (UNNG-BSB-8) bubbling and slightly pulsing |
| 39303 |
24 May 2025 @ 0858 |
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MAB |
NGB: Tree Island Geyser obviously IE - full steam fest |
| 39298 |
24 May 2025 @ 0821 |
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MAB |
NGB: New Boiling Bog seen by TSB yesterday north of 1969 Annex of the Annex north of 1968 Black Pit Annex north of Black Pit. Audible boils and pushing out hot water in a thin stream towards bwalk |
| 39281 |
23 May 2025 @ 0848 |
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TSBryan |
New Thing North of Black Pit vigorously splashing from 2 (3?) vents, but no runoff. |
| 39280 |
23 May 2025 @ 0845 |
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TSBryan |
Boggy area NNW of the New Thing North of Black Pit (needs a designation) steaming and, I think, faintly hissing. |
| 39275 |
23 May 2025 @ 0828 |
--- |
TSBryan |
Tree Island not erupting; also not i.e at 1010 |
| 39245 |
21 May 2025 @ 1702 |
--- |
MAB |
NGB: Tree Island Geyser full with steam but not erupting |
| 39225 |
21 May 2025 @ 1331 |
--- |
MAB |
NGB: Geyser towards Tree Island NOT IE! Not drained but definitely lower water level |
| 39219 |
21 May 2025 @ 1029 |
--- |
MAB |
NGB: Geyser by Tree Island now IE w BIG BURSTS totally flooding the Pinwheel channels all the way INTO Whirligig |
| 39212 |
21 May 2025 @ 0847 |
--- |
MAB |
NGB: New Thing NNW of Black Pit has enlarged its crater - the poor little tree on the edge fell in! Possibly also heating up below it NW beyond the snag that collected gravels - more water flowing towards path w one wet area slightly steaming - could be from the increased splashing that direction or snow & rain could have provided the water but not the heat - will look again end of day |
| 39208 |
21 May 2025 @ 0832 |
--- |
MAB |
NGB geyser by Tree Island NOT IE |
| 39074 |
15 May 2025 @ 1637 |
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bbev |
New breakout ~ 70' north of Black Pit erupting 12-16" from 2 separate vents. water is brown in color. Opening is about 2'x4'. |
| 39021 |
12 May 2025 @ 1850 |
--- |
MAB |
Black Pit Annex New Thing - wetter below boardwalk - nice visible splashes in crater - sandy pools west below bw bubbling |
| 39019 |
12 May 2025 @ 0920 |
--- |
MAB |
Possibly an incarnation of Black Pit Annex of the 60s - splashes more visible and area below crater wetter than Sat 10th - phone GPS gives distance at 82 and 83 ft NNW of the edge of Black Pit |
| 38961 |
10 May 2025 @ 1744 |
--- |
MAB |
NEW breakout ~70ft N of Black Pit on the same elevation. Will add more later w times from photos |
| 38974 |
10 May 2025 @ 1108 |
--- |
Janet Jones |
Percolating Spring at West Thumb was empty of water. It was full and percolating regularly last year. |
| 38975 |
10 May 2025 @ 1108 |
--- |
Janet Jones |
"Oil Slick Pool" at West Thumb Geyser Basin was completely empty of water, though water could be hear gurgling just out of sight. |
| 38978 |
10 May 2025 @ 1100 |
--- |
Janet Jones |
The orange pool north of Thumb Paint Pots was thumping loudly last fall with the water sounding very deep as the thumps came out of what seemed to be a cave forming. This spring it is full of water and looks sort of like a mini Dragon's Mouth Spring with water sloshing out of the overhang. Overall water levels in the Paint Pots area are very high with the "Paint Pots Pond" overflowing into the first pool to the north. Again, as with Surging Spring, the water levels are about as high as I've seen them. I would need to check photos, but I think there was only one other time they were this high and Surging was active then - maybe around 2009? |
| 38819 |
03 May 2025 @ 1040 |
03 May 2025 @ 1830 |
MAB |
NGB the "Tree Island Geyser" UNNG - I couldn't see if it was IE walking through at 0850 but on return saw it with huge bursts at 1040, continuing and photo-bombing shots of every other feature until I left for Back Basin again around 1400. Walking out it was NOT in eruption around 1830 |
| 38746 |
02 May 2025 @ 1201 |
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aferrara |
West Thumb parking lot feature - boiling violently 2-3' high |
| 38744 |
02 May 2025 @ 1135 |
--- |
aferrara |
Blue Funnel Pool - 2-3' of crystal blue water broken by an occasional bubble |
| 38743 |
02 May 2025 @ 1134 |
--- |
aferrara |
Thumb Geyser - opaque and greenish water |
| 38742 |
02 May 2025 @ 1132 |
--- |
aferrara |
West Thumb - Small, muddy pool between Surging and Collapsing Springs, a few feet from edge of Surging, full of boiling turbid water. |
| 38740 |
02 May 2025 @ 1127 |
--- |
aferrara |
Thumb Paint Pots - at edge of paint pots a feature is noisily sloshing and thumping against an overhang. |
| 38623 |
25 Apr 2025 @ 1011 |
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DanS |
Shelf Spring: visible boiling and small splashing from North side of pool. |
| 38491 |
19 Apr 2025 @ 1200 |
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Graham |
Fountain Group. The vent at the bottom of the stairs has been gurgling noisily all day. |
| 38430 |
10 Apr 2025 @ 1542 |
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SantaFe108 |
Lava Pool is full. Lava Pool Spouter erupting water with loud chugging noises. |
| 38349 |
01 Mar 2025 @ 1622 |
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K.Cooper |
Gibbon Meadows Feature not ie |
| 38337 |
28 Feb 2025 @ 1650 |
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aferrara |
small pool ~1' across between jagged and green spring boiling 6-8" |
| 38268 |
23 Feb 2025 @ 1605 |
--- |
K.Cooper |
Gibbon Meadows Feature not ie |
| 38280 |
23 Feb 2025 @ 1456 |
--- |
K.Cooper |
New feature behind NPR8 audibly gurgling and light thumping |
| 38256 |
18 Feb 2025 @ 1418 |
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aferrara |
crater opposite side of boardwalk from Depression (Blowout Geyser?) has standing, simmering water |
| 38189 |
10 Jan 2025 @ 1627 |
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Graham |
"Gibbon Meadow Geyser" not ie. |
| 38087 |
25 Dec 2024 @ 1017 |
--- |
K.Cooper |
unng between scissors spring and copper kettle visible water, boiling slightly, milky color |
| 38065 |
21 Dec 2024 @ 1200 |
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aferrara |
Percolatoling Spring: Noisily sloshing and huffing |
| 38060 |
21 Dec 2024 @ 1120 |
--- |
aferrara |
two pool maybe 10y south of Abyss vigorously boiling muddy water. Around 30y further south is another boiling spring with brick red water. |
| 38059 |
21 Dec 2024 @ 1110 |
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aferrara |
Feature due north or painted pools, opposite side of boardwalk from twin, jetting steam at a sharp angle, generally decreasing in intensity through 1113 |
| 38018 |
16 Dec 2024 @ 0956 |
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K.Cooper |
Gibbon meadows feature steaming heavily and splashing visible through binocs |
| 37876 |
31 Oct 2024 @ 1600 |
--- |
SantaFe108 |
Sinkhole in Porcelain Springs 3 feet below rim. |
| 37845 |
29 Oct 2024 @ 1727 |
--- |
MAB |
NGB: Black Pit developed a noisy steam vent like about halfway down the north (Steamboat side) and looks like a half circle or crescent. If it's only new-to-me it might have lost water since 27th to become so incessantly noisy.
Edit: photos show it is there 27th but but not in high pressure steam. |
| 37781 |
27 Oct 2024 @ 1140 |
--- |
Janet Jones |
Bubbles rising in Exclamation Point - I need to check photos, but it looks like fewer microbes there as well as slightly higher water levels. |
| 37749 |
24 Oct 2024 @ 1617 |
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DanS |
Pair of Tantalus creek perpetual spouters downstream from NBB Vixen bridge are very active and energetic. Smaller sputs on opposite side of creek also vigorously boiling. |
| 37718 |
24 Oct 2024 @ 1232 |
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SantaFe108 |
Tree Island Geyser NGB: Not ie, lightly steaming. |
| 37706 |
24 Oct 2024 @ 1146 |
--- |
SantaFe108 |
Primrose Springs NGB: 2 small spouters ie, sinkhole 2ft below rim! |
| 37707 |
24 Oct 2024 @ 1146 |
--- |
SantaFe108 |
Lava Pool NGB: ~6in below rim. Lava Pool Spouter jetting steam. |
| 37674 |
22 Oct 2024 @ 0841 |
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MAB |
I never do Notes on NGB Butterfly but saw actual bloops! still covered with foamy stuff as previously seen |
| 37503 |
10 Oct 2024 @ 1305 |
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SantaFe108 |
Tree Island Geyser: Not ie, lightly steaming. Vent ~50 yards to the right, from the Constant bench, erupting a pulsating jet slightly angled to ~8ft tall. |
| 37462 |
09 Oct 2024 @ 1333 |
--- |
steve |
In the UNNG-GHG-3 area the eruptive activity has moved from the northern vents to three vents in the middle and southern part of the group. |
| 37445 |
08 Oct 2024 @ 1641 |
--- |
steve |
Percolating Spring is about 2 feet below overflow and the vent on the West side of the pool (closest to the boardwalk) is perpetual. Oil Slick Pool is a little less than half full. Perforated Pool still has no water. Ephedra Pool and Blue Funnel have a little water too. |
| 37391 |
03 Oct 2024 @ 1100 |
--- |
SantaFe108 |
Tree Island Geyser not ie, but periodic heavy steaming throughout the morning. |
| 37353 |
03 Oct 2024 @ 1017 |
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SantaFe108 |
Primrose Springs: 1 spouter towards the back erupting 2 ft, sinkhole is full of milky blue water. |
| 37256 |
29 Sep 2024 @ 1000 |
--- |
TSBryan |
NBK-10 "Sputtering Tantalus Trio" probably accounted for steamy spots within Tantalus Creek. |
| 37249 |
29 Sep 2024 @ 0935 |
--- |
TSBryan |
Hydroplane Springs- central area on probable Geyser active per steam clouds |
| 37242 |
29 Sep 2024 @ 0904 |
--- |
TSBryan |
Black Pit with vigorous bubbling putting down a small overflow stream |
| 37296 |
25 Sep 2024 @ 1041 |
--- |
Siegmund |
Biscuit Basin Geyser or something near it: bulging domes to ~1 meter height, ending 1042. No visible runoff. I don't know all the holes in the Old Road Group, but this was one of the northernmost in the Baby Daisy / Biscuit Basin Geyser area, and in a place where I don't recall seeing anything splash in a very long time. I have a photo taken from the highway if anyone can identify the vent from that. |
| 37077 |
19 Sep 2024 @ 1432 |
19 Sep 2024 @ 1448 |
Micah Kipple |
"Persistent Spring" is spouting 3-5 inches from the lefthand side. But what caught our attention is the fact that it is having clear slowdowns/almost pauses complete with a slight drop in water level. At the end of the pause the spouting grows more vigorous 6-8 inches high and the frying pans on the right side also get more vigorous. Very much displays the charactistics of a geyser! |
| 37075 |
19 Sep 2024 @ 0831 |
--- |
Micah Kipple |
Orange Spring is way down and exposing it's floor of orange bacteria. No activity seen from Pulsar Spouter or "Concussion" |
| 37053 |
18 Sep 2024 @ 1740 |
18 Sep 2024 @ 1751 |
Micah Kipple |
Clearwater Springs: Most pools just sizzling with gas.
Immediately across the creek from the farthest west corner of the observation platform is a pool that looks like it could definitely do more if it wanted.
The most interesting thing is that the largest alcove across the creek, with the feature hidden from view has periodic splashing noises, with definite pauses. The discharge entering the creek from the feature is clear water. So it could potentially be a geyser. Other visitors also confirmed they were hearing pauses with me. |
| 36863 |
09 Sep 2024 @ 0857 |
--- |
JarnoO |
(wc) South of Coronet seen blipping. Of note is that it began blipping shortly after the September 6 eruption. Coupled with CalebD's earlier observation that it was seen blipping after August 12's eruption, this could indicate blipping is part of its post-eruptive behavior. Previously entered as 'Coronet area geyser'; based on comparing September 2023 satellite imagery and the September 6 eruption, it seems to be a long-existing hole about 13 feet south of it, at 44.463496, -110.829684. |
| 36801 |
06 Sep 2024 @ 1326 |
--- |
cb |
Tree Island Geyser in Porcelain basin is steaming but no visable water. |
| 36798 |
06 Sep 2024 @ 1317 |
--- |
cb |
Porcelain Basin, Primrose Spring pools are full. The one closest to the bw is bursting to 2', other one closest to the berm bursting to 1', One furthest north has some weak bursting |
| 36577 |
27 Aug 2024 @ 1821 |
--- |
cb |
tree island Geyser in Porcelain basin is NOT active |
| 36460 |
18 Aug 2024 @ 1130 |
--- |
Janet Jones |
Trees have been dying next to Mimulus Pools over at West Thumb this year - on this visit one small tree has mud on its base and the hole next to it was acting as a fumarole. |
| 36458 |
18 Aug 2024 @ 1029 |
--- |
Janet Jones |
The orange spring north of Thumb Paint Pots sounds an awful lot like Dragon's Mouth Spring - booming from deep within the crater. Mud was sloshing up into view on August 4, 2024, but on this visit, only a couple of small splashes could be seen. The vents near it that opened up a few years back also are connected and send out sounds. Water levels in the neighboring spring still has grass growing in what water is left in the crater. Thumb Paint Pots also have lower water levels. |