| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 25019 |
18 Feb 2023 @ 1456 |
--- |
SantaFe108 |
Mammoth Hot Springs //
Canary Spring: flowing,
Grassy Spring: flowing,
Mound Spring: flowing,
Dryad Spring: dry. |
| 24912 |
15 Jan 2023 @ 1731 |
--- |
Graham |
Pygmy Geyser spot is bubbling again. Has been quiet on other recent walk bys |
| 24840 |
08 Jan 2023 @ 1245 |
--- |
Graham |
Noisy bubblers right by the boardwalk in line between Silver Spring and Little Squirt. 5 small sputtering spots on Little Squirt side. Possibly Pygmy Geyser location. 1/12/23 area is dry and inactive. |
| 24773 |
15 Dec 2022 @ 1310 |
15 Dec 2022 @ 1340 |
aferrara |
Between Little Squirt and the boardwalk, several small bubblers active, moving gravel, boiling and sizzling constantly. One vent occasionally throwing drops of water 3". |
| 24659 |
08 Nov 2022 @ 1406 |
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Delta4Heavy85 |
Beehive's West Vent is steaming and there may have been a around 6 inch splash at 140602 but it is hard to tell. |
| 24518 |
29 Oct 2022 @ 1836 |
--- |
SantaFe108 |
Unnamed geyser next to Beach and Son of Beach blooping. |
| 24421 |
16 Oct 2022 @ 1308 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. No water visible in crater. |
| 24386 |
14 Oct 2022 @ 0925 |
--- |
MAB |
NGB: worth noting is flowing water in one channel below Ramjet Springs near and under boardwalk w doubtful precipitation overnight - no steam seen up there though - 2nd channel closest to Pinwheel dry |
| 24318 |
08 Oct 2022 @ 1314 |
08 Oct 2022 @ 1319 |
DanS |
From Artemisia trail there is a round feature (surging spring?) at top of hill beyond West Sentinel with obvious variable steam emitting (making smoke signals). Unable to observe any splashing water though. |
| 24320 |
08 Oct 2022 @ 1300 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Water level down 2-3" from rim. |
| 24299 |
07 Oct 2022 @ 1240 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Crater empty, first time I have seen this in over 2 months. As of 1315, steam seemed to indicate a rising pool level but it was not.visible yet. |
| 24261 |
05 Oct 2022 @ 1413 |
--- |
cb |
Norris sinks- Norris back basin. Active still. Main vent eruptions to 1' & its side vent blooping 1-3". platform is white. Pool to the SW has 3 active vents erupting 1-3"; color is green and clear |
| 23985 |
21 Sep 2022 @ 1230 |
--- |
CrisG |
Mammoth update: Grassy Springs flow stops around the near edge of the three way boardwalk intersection. Dryad is dry. Not even a puff of steam. Canary is extending more in the direction of Jupiter Terrace. Water is not filling the old vent. Decent flow down Marble Terrace. New Blue is pretty and flowing into the terraces. A small trickle is reaching the bottom of the hill. Narrow Gauge has great color to the far end. Orange Spring Mound is still flowing well from the end near the road. Prospect Spring still active, though flow much less than on my June visit and not threatening the road. Mound Spring is still flowing well. Palette is flowing well from the pool west of Devil's Thumb. Thankfully the flow is more away from the Thumb. The pool to the east of the Thumb is not overflowing the terrace as much as usual but appears hotter. The overflow is going south and west of that pool rather than over the side and is pooling hotter water. Cleopatra is unchanged. |
| 23956 |
20 Sep 2022 @ 1607 |
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ypcaribou |
Root Pool. Water joined in middle. Murky, sour yellow green. |
| 23921 |
19 Sep 2022 @ 1223 |
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CP |
Occasionally, two or three eruptions merged together, giving the appearance of a longer duration. |
| 23639 |
07 Sep 2022 @ 0840 |
--- |
MAB |
NGB Lava Pool Complex circular spouter seen off last visit now seen IE - too steamy to see if perpetual or periodic |
| 23619 |
07 Sep 2022 @ 0825 |
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aferrara |
Vents west of Jewel noisily bubbling at depth. |
| 23371 |
23 Aug 2022 @ 1600 |
--- |
MAB |
NGB Lava Pool Complex- the little orange circular spouter seen perpetually IE all season now quiet at least thru 1800 |
| 23301 |
20 Aug 2022 @ 0921 |
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steve |
Son of Scummy is full and not erupting |
| 23256 |
18 Aug 2022 @ 0936 |
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MAB |
NGB Son of Green Dragon audible splashing |
| 23206 |
15 Aug 2022 @ 1609 |
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steve |
The water level goes in Blue Funnel is up about 6 inches and the water level in Oil Slick Pool is up about a foot or so. |
| 23205 |
15 Aug 2022 @ 1604 |
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steve |
Waterfall Geyser in West Thumb has visible water now. |
| 23179 |
14 Aug 2022 @ 0950 |
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ypcaribou |
Semi Centennial - Time approximate. Pool was a 24 oz coffee with 1 cream dark muddy brown. One area of pool close to road, about 5 - 10 ft in diameter, was a lighter Latte brown. |
| 23133 |
10 Aug 2022 @ 2044 |
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Tara |
Old Bellefontaine, Fountain Group, LGB. Looks to be completely drained, no water or steam visible. |
| 23131 |
10 Aug 2022 @ 1210 |
--- |
Janet Jones |
“Vandalized Spring” at West Thumb Geyser Basin is overflowing. |
| 23055 |
05 Aug 2022 @ 1321 |
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cb |
Primrose spring group. Porcelain basin. 3 of the 4 pools are empty, 1 closest to the bw is active, high, blue/green in color with 8" boil |
| 22943 |
30 Jul 2022 @ 1430 |
30 Jul 2022 @ 1545 |
LynnS |
Clepsydra’s side vent bursting |
| 22936 |
29 Jul 2022 @ 0945 |
29 Jul 2022 @ 1100 |
LynnS |
Clepsydra’s side vent bursting 1/2 feet above ground. |
| 22935 |
29 Jul 2022 @ 0615 |
29 Jul 2022 @ 0623 |
LynnS |
Clepsydra’s side vent is bursting 1-2 feet above ground |
| 22924 |
28 Jul 2022 @ 1500 |
28 Jul 2022 @ 1630 |
LynnS |
Clepsydra’s side vent bursting 1-2 feet above ground |
| 22923 |
28 Jul 2022 @ 0905 |
28 Jul 2022 @ 1109 |
LynnS |
Clepsydra’s side vent bursting 1-2 feet above ground |
| 22880 |
27 Jul 2022 @ 1230 |
27 Jul 2022 @ 1350 |
LynnS |
Clepsydra’s side vent: Bursting 1-2 feet above ground level |
| 22856 |
26 Jul 2022 @ 1157 |
--- |
cb |
Porcelain basin, Primrose Spring group. 2 of the 4 pools are empty and dry, 1 toward Blue has water but no activity. the 1 pool closest to the bw is still active & greenish blue |
| 22833 |
24 Jul 2022 @ 0845 |
24 Jul 2022 @ 0946 |
LynnS |
Clepsydra’s side vent bursting 1-2 feet above ground |
| 22810 |
23 Jul 2022 @ 1300 |
23 Jul 2022 @ 1401 |
LynnS |
Butsting 1-2 feet above ground. |
| 22809 |
23 Jul 2022 @ 0635 |
23 Jul 2022 @ 0930 |
LynnS |
Clepsydra’s side vent is bursting |
| 22786 |
22 Jul 2022 @ 0535 |
22 Jul 2022 @ 0600 |
LynnS |
Clepsydra’s side vent was full at 0535. At 0550 the water level was dropping quickly; no water was visible in the crater by 0600. |
| 22755 |
21 Jul 2022 @ 0840 |
21 Jul 2022 @ 1001 |
nails |
“Son of Scummy” About a 20 minute cycle from low pool with gentle boiling to overflow with vigorous bursting. Full and bursting at 855, 916, 940, 1000. Bursts 1 to 2 feet. |
| 22782 |
21 Jul 2022 @ 0630 |
--- |
LynnS |
Clepsydra’s side vent bursting 1-2?feet above ground level. |
| 22696 |
19 Jul 2022 @ 1024 |
19 Jul 2022 @ 1033 |
nails |
Son of Scummy filling with vigorous boil. Overflowing at 1027, boiling 6 inches to 1 foot. Water level dropping at 1033. |
| 22694 |
19 Jul 2022 @ 1016 |
--- |
nails |
Son of Scummy water level has dropped at least 6 inches below overflow. Gentle bubbling and blooping. |
| 22784 |
18 Jul 2022 @ 0713 |
18 Jul 2022 @ 0945 |
LynnS |
Clepsydra’s side vent bursting 1-3 feet above ground during this time |
| 22785 |
17 Jul 2022 @ 1357 |
--- |
LynnS |
Clepsydra’s side vent bursting 1-3 feet high. This is the first bursting activity I have noticed this season since I started seriously watching the Fountain Complex on June 22. |
| 22684 |
17 Jul 2022 @ 1200 |
--- |
MAB |
NGB: Increased cyclic activity from three holes up slope NNE from Incline G, just below the two grindstone looking mounds, with heavy forced splashes then a roar of steam, then quiet, repeated in waves. This appears to be very nearly in the same location as the blowout which occurred in Sept 1971 and will do some photo comparisons. Will keep an eye on it! - - -
Visible water also is pulsing out below the thick sinter at the base of the slope below the old roadway E of the Incline location. Farther south cool groundwater from the over full Nuphar area also continues to flow at a steady rate into the basin but the green algae growths are diminishing. - - -
Cross referencing this as an Incline Note also since finding things in Other Geyser is not always simple if you don't remember the year. |
| 22529 |
12 Jul 2022 @ 1612 |
--- |
cb |
Norris Porcelain. Primrose spring group. On 7/8 I reported that the color had changed specifically in the pool closest to the bw. That pool has cleared up a bit and is not as gray/black. more light gray with a blue hint. It is still erupting to ~2'. Other 4 pools in the area have cleared up and are a bit more blue. |
| 22400 |
08 Jul 2022 @ 1129 |
--- |
cb |
NPB. Primrose Spring group. 3 of the 4 main pools are quiet except for the pool on the south end of the group. it has a 2' bursting boil and is dark gray/black in color. |
| 22251 |
30 Jun 2022 @ 1810 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Full and overflowing. Had been below overflow on 6/29. |
| 22219 |
29 Jun 2022 @ 1940 |
29 Jun 2022 @ 2045 |
Tara |
Old Bellefontaine, Fountain Group, LGB. Water level down ~1', pool visible from boardwalk. Runoff channel toward Clepsydra is also dry. At 2012 it had not changed but by 2045 (after Fountain erupted) it had refilled to about 6" below the rim. |
| 22199 |
29 Jun 2022 @ 1008 |
--- |
mwolf |
hot ground turned steamy sinkhole near green dragon at norris smells like dirty wet socks with a hint of vomit of someone who recently ate processed pork. or maybe the towel bin at a ymca with a hint of elk carcass |
| 22165 |
27 Jun 2022 @ 1116 |
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MAB |
Small vent below bwalk uphill from Colloidal has developed a pool - unsure if thermal waters or mucho rain since my last look |
| 22084 |
23 Jun 2022 @ 1612 |
--- |
cb |
Trio sinks area is still very active |
| 22082 |
23 Jun 2022 @ 1545 |
--- |
cb |
Norris Porcelain basin. Nuphar Lake is still VERY HIGH and the campground trail is unpassable due to high water, fallen trees over the walkway. Color is back to dark green |
| 22051 |
21 Jun 2022 @ 0900 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Full and overflowing, had been below overflow on 6/20. |
| 22047 |
20 Jun 2022 @ 1555 |
20 Jun 2022 @ 2025 |
Tara |
Old Bellefontaine, Fountain Group, LGB. Water level just below overflow. Still not overflowing at 2025. |
| 22002 |
17 Jun 2022 @ 1245 |
17 Jun 2022 @ 1648 |
Tara |
Old Bellefontaine, Fountain Group, LGB. Water level down slightly, just below overflow at 1245. Remained this way until at least 1605. At 1648 it had reached overflow again with water extending 10-15' down the runoff channel. |
| 21996 |
16 Jun 2022 @ 1530 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Full and overflowing, had been down a few inches at 2038 on 6/15 |
| 21989 |
15 Jun 2022 @ 2038 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Water level below overflow, ~2-3" below rim. |
| 21984 |
15 Jun 2022 @ 1035 |
--- |
aferrara |
Black Pearl: Visible water splashing up vent, near constant, not leaving vent |
| 21608 |
31 May 2022 @ 1501 |
--- |
cb |
Norris back basin: Black Hermit Caldron has a ~1' in diameter vigorous boil on the south in of the pool. gray in color with black streaks |
| 21483 |
25 May 2022 @ 0730 |
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TSBryan |
"Intersection Springs" one crater with two vents splashing plae brown water to maybe 18 inches |
| 21459 |
24 May 2022 @ 0924 |
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TSBryan |
probably UNNG-ORG-2, possibly Demise Geyser, brief intermittent steam. |
| 21268 |
13 May 2022 @ 1835 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Was full and overflowing at 1500, water level is now just below overflow. Runoff channels above (north) are also dry. |
| 21252 |
12 May 2022 @ 1923 |
--- |
Tara |
Old Bellefontaine, Fountain Group, LGB. Full and overflowing, possibly a bit higher than previous normal level. Runoff channels above (north of) it are also flowing again. Was seen empty on 5/6. |
| 21188 |
06 May 2022 @ 1444 |
--- |
Tara |
Old Bellefontaine, LGB Fountain group. water level completely out of sight. It is usually overflowing. the bacteria in the runoff channel is still orange. Also, it appears that some of the runoff channels uphill (north) of Old Bellefontaine are dry as well. |
| 21091 |
26 Apr 2022 @ 1701 |
--- |
MAB |
NGB: no specific time - Heavy steam seen a few times today and last week {from Vixen} in Son of Green Dragon area - by the time I moved for a clearer view didn't see vertical water but something is hot over there |
| 20884 |
15 Mar 2022 @ 0900 |
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aferrara |
Spring across footpath from Marathon Pool vigorously boiling, slightly murky. |
| 20740 |
21 Jan 2022 @ 1315 |
--- |
aferrara |
Little spring North-Northwest of Little Brother constantly boiling and splashing, up to ~8" |
| 20238 |
31 Oct 2021 @ 1045 |
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steve |
There is a small vent about 10 feet North of Rusty that is having rare small eruptions to an inch or two above ground. Maybe it is just bubbling that rarely gets high enough to see. |
| 20220 |
30 Oct 2021 @ 1000 |
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DanS |
Primrose Springs: low constant spouting last 6 days when passing by. |
| 20096 |
24 Oct 2021 @ 0918 |
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aferrara |
Just uphill from sputnik, just under a small boulder, small vent erupting 1-4" |
| 19857 |
02 Oct 2021 @ 1311 |
--- |
cb |
NGB: Feature between Constant and Colloidal is not active at this point. maybe cuz Fireball is ie |
| 19722 |
24 Sep 2021 @ 1151 |
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Graham |
NPR Small round hole in vicinity of Africa has been splashing and overflowing all morning but stopped around the time Fireball started as it was flooded with water. Just blooping over the vent. during Fireball. resumed splashing once Fireball quit. |
| 19710 |
23 Sep 2021 @ 0930 |
--- |
MAB |
NGB: Water levels UP in many features including Glacial Melt which was dry every time I looked this season - rain or snow - who knows |
| 19483 |
11 Sep 2021 @ 1100 |
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Graham |
Small round hole splashing in line between left side of Constant bench and large rocks on right side and behind Arsenic. Evidence of washed areas. When viewed from the boardwalk at the end of the Sunday Geyser straight, it's closest to the boardwalk and he way to Fireball. Round rim, maybe 1 foot across and slightly elevated with a rough pebble looking rim. Splashing is from a full pool from right side angled to the left. Splashes did not clear the pool. The runoff channel goes under the boardwalk at the bend close to Constant. Declined to just blooping from the right side during Fireball eruption. Resumed splashing when Fireball quit. |
| 19586 |
05 Sep 2021 @ 1607 |
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Dave W |
UNNG-BBG-6 "Green Bubbler" - steaming ~10s with 1 light splash |
| 19585 |
05 Sep 2021 @ 1544 |
--- |
Dave W |
UNNG-BBG-6 "Green Bubbler" - steaming for ~10s with a single brief splash |
| 19584 |
05 Sep 2021 @ 1444 |
--- |
Dave W |
UNNG-BBG-6 "Green Bubbler" - steaming for 5s with a brief splash |
| 19582 |
05 Sep 2021 @ 1414 |
--- |
Dave W |
UNNG-BBG-6 "Green Bubbler" - heavy steam for 10s with 1 light splash |
| 19581 |
05 Sep 2021 @ 1408 |
--- |
Dave W |
UNNG-BBG-6 "Green Bubbler" - steaming but no visible water |
| 19497 |
04 Sep 2021 @ 1759 |
--- |
Dave W |
UNNG-BBG-6 "Green Bubbler" - steaming with two weak splashes |
| 19221 |
01 Sep 2021 @ 1925 |
01 Sep 2021 @ 1935 |
Micah Kipple |
UNNG-GHG-15: the northernmost vent is bursting 6"-1'. I have not observed it splashing this vigorously for the whole summer. I also suspect this activity is new based on the fact that larger splashes are striking gravel on the edges of the crater and washing it into the pool. Where suspended debris was already present when I walked up. |
| 19230 |
01 Sep 2021 @ 1624 |
--- |
MAB |
Norris: Sinks Trio - right lobe of the trio seen dry Aug 22 full - center lobe full - left lobe that was in high pressure steam now full and IE -
Crescent shaped pool behind had small boil not the vigorous IE seen when left lobe was in high pressure steam |
| 18993 |
22 Aug 2021 @ 1918 |
--- |
MAB |
Norris: Sinks Trio between Monarch and Minute in high pressure steam audible from Palpitator! Left lobe was the noisy steam vent - Right lobe completely dry- Center lobe IE - and the crescent pool behind the Trio was IE. Will try to find out when this change occurred |
| 18945 |
15 Aug 2021 @ 1130 |
--- |
Tara |
North Round Spring. Water level down, several inches below bacteria ring from "normal" level. East Round Spring water level rose by about a foot. This change occurred sometime after 2015 on 8/14. |
| 18938 |
14 Aug 2021 @ 1830 |
--- |
Tara |
North Round Spring. Water level way up, creating a pool 15-20' across, with tufts of green grass submerged. Light convection visible over vent. Water level was down in East Round Spring at this same time. |
| 18843 |
05 Aug 2021 @ 1409 |
05 Aug 2021 @ 1503 |
Micah Kipple |
(see East Sentinel note for context)
Between overflow cycles of East Sentinel, (about a 5 minute period) there is heavy gurgling and some steaming from Sentinel's side vents. But there is no evidence of eruptions recently, and no water was ever seen. |
| 18808 |
02 Aug 2021 @ 1124 |
--- |
SantaFe108 |
Morning Mist Geyser: steaming quietly with dry runoff channel. Seen from Mary Mountain trail. |
| 18654 |
25 Jul 2021 @ 0710 |
--- |
LynnS |
Arrive at Fountain Cimplex. PEANOt empty and quiet. Jet rumbling. Spasm empty and quiet. Jelly no water visible. Clepsydra active. Clepsydra’s side vent full. Thank |
| 18244 |
02 Jul 2021 @ 0745 |
02 Jul 2021 @ 1115 |
Graham |
Primrose Spring full with periods of bubbling for 3.5h. One drop at 0856 when the rock ledge in the pool was exposed. Fissure Spring full all the time. |
| 17451 |
04 Jun 2021 @ 1819 |
--- |
MAB |
NGB: Glacial Melt is nearly invisible with crumbled edges and no obvious pool - remaining yellow green water puddle is about 18in wide - Cats Eye active |
| 17367 |
30 May 2021 @ 1400 |
--- |
cb |
NGB. Nuphar Lake WAY over-full and opalescent seafoam green color. A lot if water is flowing into the lake from Porcelain Terraces. Good thing the boardwalk is there as the Water is on both sides of the boardwalk |
| 17239 |
28 May 2021 @ 1742 |
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JSJ |
Unnamed geyser (UNNG) in the hook of the J-shaped pool between Young Hopeful Geyser & Gray Bulger Geyser. Located at 44º 32’ 38.36” North latitude, 110º 47’ 04.23” West longitude. Constant, low to moderately low doming-splashing. |
| 17238 |
28 May 2021 @ 1639 |
--- |
JSJ |
UNNG-WCG-7 in the White Creek Group, Lower Geyser Basin. Basin has no visible water, as seen from pullout. Steaming. |
| 17237 |
28 May 2021 @ 1633 |
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JSJ |
Twin Butte Vista Spring - intermittent, low to moderately low splashing and occasional low spouting visible from road. Same behavior as in previous years. |
| 17063 |
12 May 2021 @ 1722 |
--- |
Tara |
Round Spring-LGB. Full to rim. |
| 17060 |
12 May 2021 @ 1600 |
--- |
Tara |
Round Spring-LGB. Water level down a few inches below rim. |
| 17073 |
12 May 2021 @ 0935 |
--- |
MAB |
NGB Porcelain- Lava Pool Complex- the little round spouter that was perpetual Apr 28 now forced steam w only occasional spits of water |
| 17039 |
09 May 2021 @ 1200 |
--- |
TheHikingDude |
The time is approximate. Dragons Mouth Spring at Mud Volcano suffered a small collapse today with the rocks blocking the flow of water. Photos in the Facebook page Yellowstone Up Close and Personal confirm it. |
| 16946 |
28 Apr 2021 @ 0930 |
28 Apr 2021 @ 1830 |
MAB |
NGB - the little circular orangeish spouter in Lava Pool Complex nearest the berm that has a nifty vortex drain appears to be perpetual |
| 16922 |
25 Apr 2021 @ 1927 |
--- |
DanS |
Round spring pool LGB - full overflowing and bubbling. |