| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 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 |
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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 |
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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 |
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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 |
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Janet Jones |
Percolating Spring at West Thumb was empty of water. It was full and percolating regularly last year. |
| 38975 |
10 May 2025 @ 1108 |
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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 |
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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 |
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aferrara |
Blue Funnel Pool - 2-3' of crystal blue water broken by an occasional bubble |
| 38743 |
02 May 2025 @ 1134 |
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aferrara |
Thumb Geyser - opaque and greenish water |
| 38742 |
02 May 2025 @ 1132 |
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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 |
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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 |
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K.Cooper |
Gibbon Meadows Feature not ie |
| 38280 |
23 Feb 2025 @ 1456 |
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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 |
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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 |
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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 |
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SantaFe108 |
Sinkhole in Porcelain Springs 3 feet below rim. |
| 37845 |
29 Oct 2024 @ 1727 |
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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 |
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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 |
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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 |
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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 |
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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 |
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TSBryan |
NBK-10 "Sputtering Tantalus Trio" probably accounted for steamy spots within Tantalus Creek. |
| 37249 |
29 Sep 2024 @ 0935 |
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TSBryan |
Hydroplane Springs- central area on probable Geyser active per steam clouds |
| 37242 |
29 Sep 2024 @ 0904 |
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TSBryan |
Black Pit with vigorous bubbling putting down a small overflow stream |
| 37296 |
25 Sep 2024 @ 1041 |
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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 |
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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 |
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cb |
Tree Island Geyser in Porcelain basin is steaming but no visable water. |
| 36798 |
06 Sep 2024 @ 1317 |
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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 |
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cb |
tree island Geyser in Porcelain basin is NOT active |
| 36460 |
18 Aug 2024 @ 1130 |
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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 |
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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. |
| 36341 |
09 Aug 2024 @ 1815 |
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cb |
Tree Island Geyser in Norris Porcelain basin is not active at this time. Reports are it hasn't been seen erupting in the past few weeks. |
| 36275 |
04 Aug 2024 @ 1331 |
--- |
Janet Jones |
The orange pool north of Thumb Paint Pots is no longer full of water, but splashing up mud and making lots of thumping slurpy noises. The water level in the Thumb Paint Pots area overall has dropped. |
| 36179 |
30 Jul 2024 @ 1641 |
--- |
cb |
tree island Geyser is not active at this time. still just steaming @ 1740. no visable water in its pool as viewed from the museum. |
| 36165 |
29 Jul 2024 @ 1317 |
--- |
cb |
Tree Island Geyser in Porcelain basin is quiet and not erupting |
| 36029 |
22 Jul 2024 @ 0800 |
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rayceanderson |
Caldera Chronicles article talking about a small hydrothermal explosion on Porcelain Terrace at Norris. https://www.usgs.gov/observatories/yvo/news/a-small-hydrothermal-explosion-norris-geyser-basin |
| 35862 |
12 Jul 2024 @ 1015 |
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ypcaribou |
Semi-Centennial Geyser. Time approximate.
"Boom truck was there along with HK Construction, lots of NPS including LE and maintenance, and HAZMAT. Looked like they were having a safety and plan of attack meeting and were getting ready to at least close one lane. Car is completely submerged." |
| 35861 |
11 Jul 2024 @ 1040 |
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ypcaribou |
Time approximate. Vehicle left road and ended up in Semi-Centennial Geyser. The vehicle sank, is fully submerged, and will sit there until 7-12 when extraction with a crane will be attempted. Geyser runoff diverted to protect Obsidian Creek. (5 occupants of car did survive and got out but their condition is unknown at this time.) |
| 35651 |
30 Jun 2024 @ 1845 |
--- |
Janet Jones |
Three-lobed Spring at West Thumb had no microbe mats floating at around 11:00 this morning, but by this evening had large mats that had risen and were floating on the surface and bubbles rising in all three lobes. |
| 35561 |
25 Jun 2024 @ 1709 |
--- |
K.Cooper |
Frying pan hole NW of Scissors spring deeper - both vents now pooling water about a foot below the surface. Splashing consistently to the surface. Still getting stronger |
| 35536 |
24 Jun 2024 @ 1930 |
--- |
Craigmon99 |
Thumb Geyser - boiling semi vigorously from thumb part |
| 35535 |
24 Jun 2024 @ 1917 |
--- |
Craigmon99 |
Feature in front of surging spring and next to boardwalk has been boiling vigorously all day. Murky light brown water. Smells of dead bacteria |
| 35531 |
24 Jun 2024 @ 1826 |
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Craigmon99 |
Percolating Spring has been bursting up to 2 feet high all day |
| 35510 |
24 Jun 2024 @ 0706 |
--- |
Craigmon99 |
Blue Funnel Pool
Water to lowest inner tube. Semi-vigorous bubbling from back vent |
| 35505 |
24 Jun 2024 @ 0645 |
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K.Cooper |
unng frying pan NW of Copper Kettle continues to deepen: now blooping 3in boils |
| 35475 |
23 Jun 2024 @ 1604 |
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Craigmon99 |
Newly active frying pan on other side of boardwalk of scissors spring has deepened substantially and is pooling water at the bottom with occasional spritzing |
| 35449 |
22 Jun 2024 @ 1613 |
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Craigmon99 |
Gurgling heard and water seen from 2 features on the other side of the boardwalk as economic. |
| 35399 |
21 Jun 2024 @ 0835 |
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K.Cooper |
Frying pan hole on the right side of the bw about 90% of the way walking from Copper Kettle to Scissors spring continues to frying pan - saw a jet of water above the surface that chipped off some of the bridge |
| 35209 |
14 Jun 2024 @ 1555 |
14 Jun 2024 @ 1559 |
Geyser Guy700 |
Clearwater Springs: Gently roiling on most springs. Small sizzling basin can be heard from road. |
| 35226 |
14 Jun 2024 @ 1524 |
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JSJ |
Pair Geyser (= RCN database name) in the southwestern Kaleidoscope Group (Lower Geyser Basin); vent is located at 44° 33' 15.35" North latitude, 110° 48' 48.74" West longitude. Blipping at 1524. Think I saw other minor activity this afternoon as well (Clepsydra steam was often obscuring). |
| 35068 |
10 Jun 2024 @ 0920 |
10 Jun 2024 @ 1212 |
SantaFe108 |
"Tree Island Geyser" was not in eruption during any point in my sit. |
| 35073 |
10 Jun 2024 @ 0929 |
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SantaFe108 |
Lava Pool spouter is active with full water. Small spring beyond Swiss Cheese Pool in Primrose Springs is erupting to ~1 ft. |
| 34948 |
06 Jun 2024 @ 1229 |
06 Jun 2024 @ 1546 |
JSJ |
[Correction: not Tonsils Spring - apparently an unnamed spring/geyser west of Tonsils Spring; see feature at 44 degrees, 32' 25.76" North & 110 degrees, 48' 17.44" West on the September 2023 satellite photo on Google Earth]. Tonsils Spring in the Tangled Geysers Group (Lower Geyser Basin). 1229: drained (water is out-of-sight). 1239: water visible again. 1246: water higher. 1257: full pool / basin. 1404: water level low, but still visible. 1410: water out-of-sight. 1416: still empty. 1430: water level has risen, but basin is not full yet. 1443: basin appears full again. 1504: water level is lower, but still visible. 1509: water is out-of-sight. 1527: still empty. 1532: water level has risen, but basin is not full yet. 1546: basin appears full. |
| 34940 |
06 Jun 2024 @ 1126 |
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JSJ |
Twin Butte Vista Spring (White Creek Group, Lower Geyser Basin) - visible low spouting. |
| 34768 |
30 May 2024 @ 1238 |
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Graham |
Norris feature between SB bridge and Echinus that was erupting last year is cool and inactive. |
| 34750 |
29 May 2024 @ 0938 |
--- |
cb |
Tree island Geyser in Norris Porcelain basin is not active at this time |
| 34701 |
26 May 2024 @ 0819 |
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ypcaribou |
Hole in path near BHC has gotten larger. Maybe 6' by 5'. Triangular with one point toward Steamboat. Audible gurgling deep inside. |
| 34628 |
21 May 2024 @ 0424 |
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JarnoO |
(wc) Large plume appeared in the Grotto - Fan and Mortar region, which also includes GNT and CLC (I guess that makes for a morning stroll...) but excludes Riverside, Grand and Artemisia. The large part of the plume (which spanned from its origin to out of frame near Castle) sustained until about 0450, after which it significantly declined. I think a Grotto start and a Rocket major can be ruled out due to the duration (Grotto start would just be a short burst of steam followed by steady steam, am not aware of a Rocket lasting any longer than 15m, let alone 20). In any case I'm hesitant to put it on a specific remaining candidate, as each one is more unlikely than the other. |
| 34463 |
05 May 2024 @ 1850 |
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SantaFe108 |
Gibbon Meadows geyser not erupting, and not a lick of steam from its area. |
| 34324 |
24 Apr 2024 @ 0900 |
--- |
DanS |
Gibbon Meadow Geyser - only a tiny amount of steam this cool morning. Not erupting. |
| 34307 |
21 Apr 2024 @ 1710 |
--- |
SantaFe108 |
Gibbon Meadows Geyser is steaming but not erupting. |
| 34226 |
19 Apr 2024 @ 2030 |
--- |
SantaFe108 |
Gibbon Meadows Geyser steaming and not erupting. |
| 34036 |
15 Feb 2024 @ 1450 |
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aferrara |
East Chinese Spring: Energetically boiling and thumping. Similar force and volume to good Doublet Pool thumps. Boiling 2' @ 1453. |
| 33972 |
04 Feb 2024 @ 1504 |
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aferrara |
Feature approx across boardwalk from Scissor Spring with standing, boiling water |
| 33955 |
30 Jan 2024 @ 1147 |
--- |
aferrara |
persistent spring energetically boiling. two new to me small sputs 2' NE of it boiling as well. STRONG fish odor. |
| 29056 |
22 Oct 2023 @ 1454 |
--- |
SantaFe108 |
Lava Pool's water level is out of sight viewing from Hurricane Vent. Spouter on the N edge forcing steam at variable volume. |
| 29163 |
22 Oct 2023 @ 1310 |
--- |
SantaFe108 |
A member of the Porcelain Springs NE of Pinwheel and NW of Blue, named "Island Geyser" (sometimes referred to as "Tree Island") powerfully bursting to 25' tall. Around 1430ish water color became light brown and then was clear again by 1500. |
| 28876 |
19 Oct 2023 @ 1148 |
--- |
DanS |
Black Hermit Caldron- large dark boils on East side of pool. |
| 28828 |
14 Oct 2023 @ 1427 |
--- |
MAB |
Gibbon Meadows geyser: from a neighbors FB post steam visible but I couldn't see a clear column of water - photo time stamp was 1427 |
| 28725 |
09 Oct 2023 @ 1330 |
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cb |
Norris back basin>Root pool is also VERY high/full! Highest water level I've seen since 2019. Both pools are connected in the narrow section of the feature, color is a milky green & it had a very weak boil over the vents in each pool. |
| 28645 |
05 Oct 2023 @ 1421 |
--- |
cb |
Nuphar Lake is still incredibly high, lime green and has thermal water flowing into it from features below where the old lunch station used to rest. The seeps from it and into Porcelain basin are not active . |
| 28389 |
21 Sep 2023 @ 1238 |
21 Sep 2023 @ 1241 |
Micah Kipple |
A couple above-ground splashes from the feature to the north of Rusty and borehole Y8. |
| 28372 |
20 Sep 2023 @ 0919 |
--- |
Micah Kipple |
The feature mentioned in my previous note has now briefly paused before returning to water phase. With energetic bursting 1-4 feet high. There is an interesting lack of chugging like I observed when I first arrived on the constant bench. |
| 28371 |
20 Sep 2023 @ 0916 |
--- |
Micah Kipple |
A feature that has been erupting with a similar style to Whirligig's rooster tail vent about 50 feet to the right of Pinto from the bench right at the base of the hillside suddenly switched to a loud roaring steam phase at this time. |
| 28301 |
17 Sep 2023 @ 1223 |
--- |
SantaFe108 |
Gibbon Meadows geyser
Not ie, steaming quietly. |
| 28282 |
16 Sep 2023 @ 1540 |
--- |
SantaFe108 |
Semi-Centenniel Geyser
Still a lighter green color as last reported. |
| 28217 |
11 Sep 2023 @ 1245 |
11 Sep 2023 @ 1330 |
CP |
New Imperial: eruptions from 1 to 6 minutes in duration, with pauses of 20 to 30 seconds between. |
| 28125 |
08 Sep 2023 @ 1110 |
--- |
Graham |
Halfway Spring on Seven Mile Hole trail is overflowing. |