Last Known Eruption
21y 301d 9h 29m ago

Latest Eruptions

Eruption DurationInterval
03 Aug 2002 @ 142817m
03 Aug 2002 @ 141113m 16m
03 Aug 2002 @ 135513m 16m
03 Aug 2002 @ 133914m 9m
03 Aug 2002 @ 1330 ie

Interval Statistics

Interval Count4
Min9m
Max17m
Mean14m
Median16m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34261 19 Apr 2024 @ 1534 --- MAB Clear! greenish water with slightly yellowish edges - string of pearls bubbling in 4 spots
29031 22 Oct 2023 @ 0853 --- SantaFe108 ~5 inches below the yellow beach, water was cloudy and a muted pineapple juice yellow color, and splashy right side boil.
28970 21 Oct 2023 @ 1527 --- JR 2 feet or so below rim, more brown than yellow.
28927 20 Oct 2023 @ 1610 --- MAB LOW - the area that was the sulphury yellow edge is the yellow beach now! Stronger boils on right with other bubbles across the pool in a fracture line - cloudy tea colored water
28893 19 Oct 2023 @ 1850 --- ypcaribou Muddy, color of coffee with 2 creams, splashing at right side. Level is lower exposing yellow on left side of crater.
28875 19 Oct 2023 @ 1139 --- DanS Low pool, olive green with active boiling at both sides of pool.
28764 14 Oct 2023 @ 1316 --- SantaFe108 Clear and green, 3 point bubbling.
28633 05 Oct 2023 @ 1158 --- cb calm, edges are covered on yellow sulfur dust. water is cloudy & yellowish green in color.
28009 04 Sep 2023 @ 1627 --- cb cloudy with a yellowish sulfur ring about 1' wide around the rim of the pool. Pool has a few bubbles breaking the surface
27340 30 Jul 2023 @ 0833 --- ypcaribou Yellow lined pool, clear blue water, overall a jade color. Quite full.
27295 28 Jul 2023 @ 2039 --- SantaFe108 3 point boil, murky green color.
27173 23 Jul 2023 @ 1424 --- mhreed Light boil. Cloudy green.
26946 08 Jul 2023 @ 1924 --- nails Bubbling in three spots, left center and right.
26826 04 Jul 2023 @ 0858 --- MAB 2 pt boil - North end and east side
26360 16 Jun 2023 @ 0919 --- CrisG water receded to approx 1.5 ft from sign. light 3pt boil
26319 14 Jun 2023 @ 1749 --- CrisG clear light yellow green water up to the front edge of the sign log. light 3 pt boil.
25965 02 Jun 2023 @ 1032 --- Tara water level not quite up to bottom of sign. crater very yellow.
25860 28 May 2023 @ 1949 --- SantaFe108 Green murky water with yellow band surrounding throat. Bubbling from three points.
25662 21 May 2023 @ 1436 --- SantaFe108 Greenish murky water with bubbling at three points. Thick ring of yellow surrounding the throat.
24401 15 Oct 2022 @ 0955 --- MAB Clear greenish water with 1.5ft of yellow on the edges - 3 pt boil
24249 05 Oct 2022 @ 1224 --- cb Pool is low, 1.5 - 2' below the sign. Green in color with yellow sulfur dust accumulated all along the rim. Roiling boil over the vent on the east end of the pool and smaller bubbles in the center
24081 24 Sep 2022 @ 1610 --- CrisG pretty yellow green color. clear with light boil.
24082 24 Sep 2022 @ 1610 --- CrisG pretty yellow green color. clear with light boil.
23960 20 Sep 2022 @ 1632 --- ypcaribou Thick yellow lining pool. Color overall looks emerald. Clear with bubbles in 2 spots.
23498 31 Aug 2022 @ 1105 --- cb High, water level is about 1' away from the back side of its name log. Sulfery yellow/green with a boil on the edge closest to Mystic.
29101 25 Aug 2022 @ 1200 --- research-mab 8/25/2022 - no time noted - -Mystic Spring lookin’ green
29098 21 Aug 2022 @ 1200 --- research-mab 8/21/2022 – - no time noted - Mystic Spring has a yellow hue
23327 21 Aug 2022 @ 1101 --- ypcaribou Yellow lining walls of spring creating an emerald green, clear pool.
23077 06 Aug 2022 @ 1127 --- cb little change, water level is up a few inches
22982 02 Aug 2022 @ 1022 --- cb pool is down a few more inches than last observation, ~8" above the inner vent rim. the rim ledge is (and has been)covered in sulfur dust. pool is greenish/yellow with a 3" roiling boil in 5 spots that seem to follow a line from the east to the west end of the pool, dead center. FYI, a week ago it was calm, random occational bubbles, same color.
22920 27 Jul 2022 @ 1615 --- MAB nearly full with a few sm bubbles - clear bluish color with yellow edges
29080 09 Jul 2022 @ 1620 --- research-mab 7/9/22 Mystic Spring is brown & green 420 pm
22317 04 Jul 2022 @ 1436 --- cb pool has dropped 1' since last observation. yellowish with a blooping boil at the end of the pool toward Echinus.
22208 29 Jun 2022 @ 1359 --- cb pool level has dropped ~4" to just behind the sign log. Edges still are covered in sulfur dust. color yellowish green. bubbling on the east end of the pool.
22116 25 Jun 2022 @ 1129 --- cb water level is basicly the same as last observation except it has more yellowy sulfur dust accumulated along the edges of the pool. 2 areas with a small boil breaking the surface.
22092 23 Jun 2022 @ 1816 --- cb Mystic and Mud springs are at the high water mark! Mystic water is past the sign, yellowish in color with a small boil on east edge
21606 31 May 2022 @ 1450 --- cb pool level is HIGH! Water fro the pool surrounds the name placard. water is clear with a sulfur dust along the edge of the vent. 2 very slight areas with convection, no boil.
21328 16 May 2022 @ 1110 --- Tara Green color, looks like a lot of yellow on sides of crater. Water level high enough that the bottom of the name sign is submerged, maybe 6-8" above inner rim.
21011 18 Apr 2022 @ 1719 --- MAB Full. Clear greenish water w yellow edges
20299 04 Nov 2021 @ 1226 --- MAB yellowish edges with blue green middle - higher water - line of bubbles across the pool in 4 spots w the most action on the Northish end
20055 19 Oct 2021 @ 1440 --- cb pool is VERY high with a roiling boil on the East end of the pool. color is blue/green
19898 05 Oct 2021 @ 1201 --- MAB higher water - bloopy east side boil - light center boil and occasional bloop from under a ledge on south side
19809 30 Sep 2021 @ 1233 --- cb pool is up higher than last observed. Up to the tip of the protruding rock on the east edge of the pool with a small boil right next to it. pool is a cloudy light blue green color.
19698 23 Sep 2021 @ 1020 --- cb no change
19606 16 Sep 2021 @ 1029 --- cb Water level is ~10" below the high water mark. Pool is a gray color with a 3" blooping boil on the south end.
19370 08 Sep 2021 @ 1130 --- Tara Down ~2.5', yellowish murky water, light bubbling in front right corner
18781 01 Aug 2021 @ 1012 --- cb pool is higher by a few inches, yellowy green in color with a boil in the side toward Tantalus
18739 30 Jul 2021 @ 0730 --- ypcaribou Section of dead, red needled trees just past Mystic Spring on left (walking clockwise around loop). Don't recall seeing this in fall of 2020.
18505 18 Jul 2021 @ 1047 --- cb Mystic, Mud & Yellow Spring pools are also much lower than previously viewed.
18370 11 Jul 2021 @ 1442 --- cb no change from last observation.
18282 05 Jul 2021 @ 1453 --- cb Mystic Spring, Mud & Yellow mud all look the same as last observed on 6/29. Yellow mud might be a tad lower. No longer any spray from Puff & Stuff geyser.
18185 29 Jun 2021 @ 1321 --- cb same level. yellowish green with a vigorous boil on the edge toward Echinus.
17575 08 Jun 2021 @ 1110 --- cb pool up a bit from last observation. Vigorous boil on east edge. yellow in color
17278 30 May 2021 @ 1551 --- cb pool up slightly (a few inches) higher than the 6th. It's a sulfury yellow green color with a vigorous boil on the east and south side of the pool
16394 10 Oct 2020 @ 1018 --- cb same as last observation. Yellowish with a few random bubbles breaking the surface.
16341 06 Oct 2020 @ 1220 --- cb Water level is covering the shelf on the south east edge by ~2-3" of yellowish/green, clear water and occasional bubbles break the surface in this area.
16272 26 Sep 2020 @ 1629 --- cb Mystics pool is high. 3" of water covers the shelf inside the pool on the south end of the pool. It is yellowish green, calm with occasional dime to quarter sized bubbles breaking the surface.
15548 13 Aug 2020 @ 1026 --- cb pool is covering the shelf on the NE edge with about 4" of water and has a few random bubbles breaking the surface. color is yellowish green. pool is calm
15658 03 Aug 2020 @ 1055 --- Tara With Steamboat in steam phase, Mystic Spring was down about 18" from the log on the west side and had slightly murky green-blue water.
14526 03 Jun 2020 @ 1340 --- cb Pool is low, calm and has that sulfer yellow color at the edges to about 1' down into the pool and then deeper into the vent it becomes greenish.
14502 01 Jun 2020 @ 1803 --- ypcaribou Clear, emerald blue
13927 12 Oct 2019 @ 1230 --- cb water level is up to the sand on rhe west end of the pool. It is clear, greenish in color & no bubbles.
13890 05 Oct 2019 @ 1210 --- cb pool is high, clear and occasional bubbles.
13756 19 Sep 2019 @ 1220 --- cb light emerald green in color. Occasional bubbles on the east and west end of the pool.
13254 14 Aug 2019 @ 1619 --- cb unchanged. ~2' below rim. greenish yellow with a boil on the east end of the pool.
13125 09 Aug 2019 @ 0834 --- cb pool is low. water is just covering the rock outcropping/shelf of the NE rim. color is a cloudy greenish yellow. **Mud spring is very low! Down ~ 2.5' from the rim (not overflow). Pool is calm and cloudy greenish in color. ** Blue Mud Steam Vent water level is low. Splashing water is barely visable deep in the vent.
29135 05 Aug 2019 @ 1200 --- research-mab 8/5/2019 - no time noted- Crater Spring, Root Spring, Mystic Spring and Yellow Funnel are between 1 and 4 ft lower water level
12995 03 Aug 2019 @ 0835 --- cb yellowish green in color. 3 areas that have bubblers breaking the surface.
12969 02 Aug 2019 @ 0936 --- MAB green yellow in color with fairly active bubbles
12889 31 Jul 2019 @ 0854 --- cb light yellowish green in color and has a small roiling boil on the south end
11022 20 Apr 2019 @ 1033 --- MAB Low water, appeared slightly cloudy but could have been steam.
9833 22 Aug 2018 @ 1835 --- cb high (up to the log debris) and a yellow/greenish color.
9130 11 Jul 2018 @ 0920 --- Tara Down about 18" and burbling to a gee inches.
29623 08 Aug 2017 @ 1710 --- research-mab 8/08/2017 Mystic down @ 1710
29608 20 Jun 2017 @ 1200 --- research-mab 6/20/2017 - no time noted - Mystic Springs water level is down
20472 07 Oct 2015 @ 1200 --- research-mab 10/7/2015 – Water/liquid back up for Mystic & Crater Yellow Funnel and Blue Mud still low. [generic day time]
20469 05 Oct 2015 @ 1200 --- research-mab 10/05/2015 Mystic, Green dragon, Crater & Yellow Funnel all MUCH lower liquid Blue Mud so low it sounds hollow as it bubbles deep. [generic day time]
29552 14 Jul 2015 @ 1200 --- research-mab 7/14/2015 - no time noted - Mystic Spring’s water level is low.
29517 19 Jul 2014 @ 1200 --- research-mab 7/19/2014- no time noted - Mystic Spring water level has increased from this morning
29492 20 Sep 2013 @ 1430 --- research-mab 9/20/2013 - no time noted - The water level in Mystic Spring is flush with the ground again. It had dropped earlier in the season around the same time as the Dishwater Spring water level had dropped. On my walk this morning the water level was still down. By 2:30 this afternoon it was full.
29464 22 Aug 2012 @ 1645 --- research-mab 8/22/2012 Mystic at 1645 full, venting so much gas it was fizzing!
29407 21 May 2012 @ 1650 --- research-mab 5/21/2012 Visitor report Mystic Spring water level dropped ~3” in a few minutes around 1650
29382 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.
29372 26 Aug 2009 @ 1200 --- research-mab 8/26/2009 - no time noted - Mystic was boiling and started to fill and then over flow. After about 15 min the water drained back into the vent.
29369 18 Jul 2009 @ 1600 --- research-mab 7/18/2009 Mystic overflowed @~1600 hrs
29368 16 Jul 2009 @ 1600 --- research-mab 7/16/2009 Mystic Spring overflowed @ ~ 1600 hrs
29367 15 Jul 2009 @ 1200 --- research-mab 7/15/2009 Above mentioned Mystic event (7/9/) has occurred at least 3 times now (in the last week) {not all times noted}
29361 09 Jul 2009 @ 1515 09 Jul 2009 @ 1530 research-mab 7/9/2009 Mystic Spring filled, overflowed, and drained (~14” rise, then fall in elevation) between 1515 and 1530)
29784 07 Sep 2007 @ 1200 --- research-mab 9/7/2007 - no time noted - Mystic Spring is cloudy and erupting 1-2’
29822 23 Sep 2004 @ 1200 --- research-mab 9/23/2004 - no time noted - Mystic water level ↓and turbid
20587 03 Aug 2002 @ 1329 --- research-mab 08/03/2002 WMoats listserv report: This is the first time that I've seen this pool erupt. It erupted from the northeastern side of the pool as short bursts a maximum of 3 ft high and three feet wide. The central and southwestern sides of the pool boiled, but there was no bursting activity from these parts of the pool. Eruptions started with strong boiling and 0.5 ft splashes that would build over several minutes into 2 ft bursts, with occasional 3 ft bursts. At their peak, the eruptions would last about a minute, then the eruptions would decline quickly.
30129 18 Aug 1995 @ 1200 --- research-mab 8/18/95 - no time noted - Emerald Pool is no longer having the heavy boils seen since the beginning of disturbance on the 29th.Water levels remain lower than “usual” & heavy boils continue in Crater, Mystic & Mud Springs.
30111 03 Aug 1995 @ 1201 --- research-mab 8/4/1995 - no times noted - Yesterday {3rd} Back Basin still was reflecting disturbance activity. Mystic was overflowing to the west & boiling approx 1 ft.
30298 07 Sep 1993 @ 1200 --- research-mab Sept 7 1993 - no time noted - Also Mud Spring & Mystic spring low. [NOTE during these years there was confusion about Mystic, Mud and NBK8 so very few single entries will be entered here - A note containing both will work - mab]
30270 24 Aug 1993 @ 1200 --- research-mab 8/24/1993 - no times noted - Other signs of disturbance (albeit mild - from logbook accounts I’d say we started around 8/20} - Mystic Spring dark and roiling boil
30365 17 Jul 1992 @ 1200 --- research-mab 7/17/92 - no time noted - Also the pools in Back Basin seem to be boiling more violently. Mystic is very muddy.
30833 08 Aug 1988 @ 1200 --- research-mab 8/8/1988 - no time noted - Mystic Spring is boiling to 1 foot.
30821 06 Aug 1988 @ 1200 --- research-mab 8/6/1988 - no time noted - Mystic Spring – no drainage that I can discern- Stay on Trail sign has been thrown into spring
31095 21 May 1983 @ 1200 --- research-mab May 21 1983 – no time noted ~afternoon - Mystic Spring – Clear, boiling steadily.
31077 20 May 1983 @ 1200 --- research-mab May 20 1983 - no time noted - Disturbance!... Mystic Spring – vigorously boiling, little change from normal water clearness.
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Baseline does not exist.