| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 40858 |
05 Aug 2025 @ 1815 |
--- |
MAB |
Clear quiet and beautiful - water level looks about the same as 27th |
| 40665 |
27 Jul 2025 @ 1812 |
--- |
MAB |
clear with water level almost identical to 19th - little shelf vent NE now not connected has a tad more water this week and some tiny ripples were seen - after this the 1812 Overture was in my head until I got to Root Pool |
| 40512 |
19 Jul 2025 @ 1820 |
--- |
MAB |
perfectly clear - dropped about 2 inches since 13th |
| 40384 |
13 Jul 2025 @ 1810 |
--- |
MAB |
Clear and up above shelf and to top of cove but not high enough to connect to little sulphur vent but! it has its own water w bubbles |
| 40266 |
06 Jul 2025 @ 1914 |
--- |
MAB |
Clear - water level up several inches since 28th - hard to see into the cove in the shadow |
| 40127 |
28 Jun 2025 @ 1815 |
--- |
MAB |
remarkably clear - water has come up nearly to top of wall cove and almost spilling into ledge with that other vent - in steep vertical areas probably 18in from top |
| 39964 |
20 Jun 2025 @ 1730 |
--- |
MAB |
water level same at bottom of wall cove - lemon lime colors |
| 39858 |
13 Jun 2025 @ 1729 |
--- |
MAB |
same level at bottom of cove - more yellowish deposits around edges making water color green |
| 39753 |
08 Jun 2025 @ 1756 |
--- |
MAB |
yellow edges w clear green water - strong boil NE end just below that shelf vent that is now high and dry |
| 39683 |
05 Jun 2025 @ 1740 |
--- |
MAB |
even lower than 29th just at bottom of wall cove - yellowish edges shading to Gatorade green middle |
| 39497 |
29 May 2025 @ 1731 |
--- |
MAB |
Pool dropped now w half of the wall cove exposed - that shelf vent to NE now exposed and dry - still very pretty color of cloudy greenish blue |
| 38954 |
10 May 2025 @ 1642 |
--- |
MAB |
still quite full clear blue and beautiful |
| 38800 |
03 May 2025 @ 1658 |
--- |
MAB |
still full clear and beautiful |
| 38669 |
27 Apr 2025 @ 1800 |
--- |
MAB |
Full, clear, beautiful - I will note that Yellow Mud Pool behind it had visible upwelling where I did not see any last week |
| 38533 |
19 Apr 2025 @ 1634 |
--- |
MAB |
Full full full even over the SSE shore vent that is sometimes sulphury - very pretty clear turquoise |
| 38412 |
10 Apr 2025 @ 1207 |
--- |
SantaFe108 |
Impressive sapphire blue color. Water level just a *hair* below the alcove roof, the secondary vent right of the main pool is also connected. |
| 37891 |
31 Oct 2024 @ 1643 |
--- |
SantaFe108 |
~1.5ft below the alcove roof with yellowish-brown murky water. Right-side boil. |
| 37838 |
29 Oct 2024 @ 1655 |
--- |
MAB |
steamy but basically same water level as before - Yellow Mud area behind a little less active than 27th |
| 37803 |
27 Oct 2024 @ 1346 |
--- |
MAB |
wow low! steady boil NE portion - water below bottom of cove in S wall |
| 37729 |
24 Oct 2024 @ 1556 |
--- |
SantaFe108 |
Low, 1.5ft below alcove roof. Right-side boil in murky yellowish-brown water. Right vent dry. Spring behind and to the left boiling and putting out copious overflow in all directions. |
| 37480 |
10 Oct 2024 @ 1020 |
--- |
SantaFe108 |
Also very high, ~2" above roof of alcove. Left vent connected, clear and blue. |
| 37375 |
03 Oct 2024 @ 1525 |
--- |
SantaFe108 |
Full of clear, aqua water. Right vent connected to main pool and alcove underwater! Pool level about 5in below rim on alcove side. |
| 37221 |
28 Sep 2024 @ 1705 |
--- |
cb |
pool is also very high. water is turquoise blue clear & calm (steamy) |
| 36584 |
27 Aug 2024 @ 1856 |
--- |
cb |
pool is high. water covering and above the alcove on its west end. clear and greenish in color |
| 35424 |
21 Jun 2024 @ 1535 |
--- |
nails |
Light blue with some bubbling in back right side. |
| 35091 |
10 Jun 2024 @ 1254 |
--- |
SantaFe108 |
Slightly cloudy, aquamarine water. Water level is about 6 inches from the top of the left alcove. |
| 35002 |
08 Jun 2024 @ 1134 |
--- |
cb |
Clear, calm & beautiful blue color. pool level is half way into the alcove to the west |
| 34699 |
26 May 2024 @ 0804 |
--- |
ypcaribou |
Abdolutely clear turquoise blue.Full. |
| 34259 |
19 Apr 2024 @ 1533 |
--- |
MAB |
Beautiful clear blue!!! - quite full up into the little cove but couldn't see water level in there due to light and steam - not full enough to top the NE ledge by that nearby vent |
| 29030 |
22 Oct 2023 @ 0854 |
--- |
SantaFe108 |
~1½ feet below the alcove roof, bubbling in many places with cloudy green water. |
| 28971 |
21 Oct 2023 @ 1529 |
--- |
JR |
2 feet below rim. A murky green, a bit opaque. Slight bubbling. |
| 28926 |
20 Oct 2023 @ 1608 |
--- |
MAB |
greenish fairly clear - dropped lower to bottom quarter of the wall cove - LOTS bubbles from several points - more on right side - YELLOW MUD SPRING behind it had a solid large area of upwelling - usually fairly cool back there! |
| 28765 |
14 Oct 2023 @ 1317 |
--- |
SantaFe108 |
Water level into the alcove, clear and blue. |
| 28788 |
14 Oct 2023 @ 1220 |
--- |
MAB |
clear |
| 28634 |
05 Oct 2023 @ 1200 |
--- |
cb |
turquoise blue, calm & 1' below high water mark! |
| 28505 |
26 Sep 2023 @ 1717 |
--- |
MAB |
Clear blue-green and quiet - water level more than halfway up the cove on ~SW side |
| 27294 |
28 Jul 2023 @ 2038 |
--- |
SantaFe108 |
Water level half-way up the cove and spectacularly clear and blue. |
| 26827 |
04 Jul 2023 @ 0859 |
--- |
MAB |
clear pretty- water halfway up the cove |
| 25964 |
02 Jun 2023 @ 1032 |
--- |
Tara |
clear and beautiful pale blue, water level just above overhang on right side |
| 25861 |
28 May 2023 @ 1950 |
--- |
SantaFe108 |
Brilliant blue clear water. Water level just up to the cove on the left of the pool. Far right vent is dry. |
| 25661 |
21 May 2023 @ 1435 |
--- |
SantaFe108 |
Spectacular blue color. Water level up to right inside the little cove on the left. Far right vent is dry. |
| 24402 |
15 Oct 2022 @ 0953 |
--- |
MAB |
half full and into the cove on wall - clear blue green and calm |
| 24250 |
05 Oct 2022 @ 1229 |
--- |
cb |
Not much change, pool is about 3" lower than last observation. color is deep blue and pool is calm & clear |
| 23961 |
20 Sep 2022 @ 1635 |
--- |
ypcaribou |
Clear, deep blue. Water tops out about 1 ft down from rim. This one wins the clearest bluest award for today's walkabout. |
| 23499 |
31 Aug 2022 @ 1120 |
--- |
cb |
Steaming, calm, blue, (visitor just said Listerine blue) high. water is halfway up into the alcove toward NBK-8. |
| 22983 |
02 Aug 2022 @ 1029 |
--- |
cb |
Only change is the clarity of the pool. A bit more cloudy. pool level is just at the bottom of the cave on the west end. |
| 22919 |
27 Jul 2022 @ 1614 |
--- |
MAB |
pretty blue color filled halfway up the inner cave like area - calm - little vent nearby the right edge still high and dry |
| 22318 |
04 Jul 2022 @ 1439 |
--- |
cb |
pool down 8" at least, calm and beautiful blue color |
| 22117 |
25 Jun 2022 @ 1133 |
--- |
cb |
calm, clear, deep blue color and same pool level as last observation. water is up to & covering the small cave on the west edge |
| 21607 |
31 May 2022 @ 1453 |
--- |
cb |
pool level also very high, up to & covering the alcove on the west edge of the pool. water is clear & calm. no boil. |
| 21329 |
16 May 2022 @ 1110 |
--- |
Tara |
Clear and blue, water level just at the overhang on the left side. |
| 21012 |
18 Apr 2022 @ 1716 |
--- |
MAB |
Clear blue in color about half full - nearly to the top of the SW cove vent but not full enough to connect with the NE sulphury vent |
| 20295 |
04 Nov 2021 @ 1225 |
--- |
MAB |
higher water than this summer - over that inner ledge but still only about half full |
| 20054 |
19 Oct 2021 @ 1404 |
--- |
cb |
pool is higher, covering the rock point. has a few small bubblers in the pool. |
| 19810 |
30 Sep 2021 @ 1235 |
--- |
cb |
Same water level. pool is emerald green in color, calm, mostly clear & steamy. #7 pool is cloudy greenish color, calm & #8 is yellowy in color with a 4" blooping boil on the edge toward Yellow Funnel spring & it is not in overflow. |
| 19607 |
16 Sep 2021 @ 1032 |
--- |
cb |
water level is ~2.5' below the rim. Water is amazingly clear, green in color and steaming |
| 19625 |
16 Sep 2021 @ 0929 |
--- |
MAB |
low - water still clear |
| 19372 |
08 Sep 2021 @ 1135 |
--- |
Tara |
Clear greenish water, calm, down 3' |
| 18506 |
18 Jul 2021 @ 1048 |
--- |
cb |
Pool has dropped another ~3". Opalescent blue with a slight yellowy tinge on the edges |
| 18327 |
09 Jul 2021 @ 1330 |
--- |
MAB |
still low low low - opalescent blue - down 3 ft - that little vent on the shelf on the NE side that would dribble sulphur into Mud is still high and dry |
| 18184 |
29 Jun 2021 @ 1323 |
--- |
cb |
no change in water level. no boil or bubbles, color is a milky opalescent blue |
| 17724 |
12 Jun 2021 @ 1620 |
--- |
MAB |
4 feet below high water marks- incredibly low |
| 17574 |
08 Jun 2021 @ 1112 |
--- |
cb |
water level up 6" since last observation. color is opalescent turquoise blue and calm |
| 17277 |
30 May 2021 @ 1554 |
--- |
cb |
very low, 1.5 - 2' below smooth water mark on the north rim. The rock outcropping that sticks out into the pool is barely covered with water. pool is a opalescent milky turquoise blue in color and calm. |
| 16395 |
10 Oct 2020 @ 1020 |
--- |
cb |
same as as last observation. Water is calm and turquoise blue. |
| 16342 |
06 Oct 2020 @ 1224 |
--- |
cb |
water level is down 2' from the rim of the pool. It is steamy, ( 65°today) clear and blue in color. Pool appears lower by a few inches than I observed last time. |
| 16271 |
26 Sep 2020 @ 1626 |
--- |
cb |
water level is about 2' down from the rim. This is about 4" down from my observation 3 weeks ago. Pool is calm, blue green in color and has no bubbles or boil |
| 29158 |
30 Jul 2020 @ 1200 |
--- |
research-mab |
7/30/2020 - no time noted-- Big Pool S of Mystic {Mud Spring? ← written in} – dramatic color change! Much darker green not turquoise |
| 13253 |
14 Aug 2019 @ 1615 |
--- |
cb |
up a tad bit but still a good 2'+ down from the rim. (not overflow) Covering the rock peninsula on the south edge inside the pool. it is a milky blue color and calm. |
| 12996 |
03 Aug 2019 @ 0839 |
--- |
cb |
down 8". greenish blue in color |
| 12970 |
02 Aug 2019 @ 0938 |
--- |
MAB |
pretty green- water level still low |
| 11023 |
20 Apr 2019 @ 1035 |
--- |
MAB |
Low, very low water, but a pretty greenish color. Clear. |
| 9967 |
31 Aug 2018 @ 1034 |
--- |
MAB |
Nearly full, well over the shelf on the east. Not quite up to the sulfur-y vents yet, but much more water. Clear, beautiful blue water |
| 9622 |
10 Aug 2018 @ 1339 |
--- |
MAB |
LOW water, clear beautiful blue. |
| 29620 |
02 Aug 2017 @ 1200 |
--- |
research-mab |
8/02/2017 - no time noted - Mud Spring, south of Mystic Spring has changed from a blue color to more of a green color. |
| 29614 |
23 Jul 2017 @ 1200 |
--- |
research-mab |
7/23 - no time noted - (possibly Mud Sp? mab) - Moon= low pools? The pool just west of Mystic Spring is ~2 ft down than normal |
| 29592 |
25 Aug 2016 @ 1200 |
--- |
research-mab |
8/25/2016 - no time noted - Mud Spring has changed color to a clear sapphire blue, very pretty |
| 2789 |
24 Apr 2016 @ 1500 |
--- |
sfavor |
Mud Spring looked like it had a large eruption with spray approximately 30' uphill. |
| 29777 |
30 Aug 2007 @ 1200 |
--- |
research-mab |
8/30/2007 .- no time noted - • The usually quite clear and murky pools between Echinus and Puff’n Stuff were turbulent – small areas of water gushing in the pools about 6-12 inches. |
| 30130 |
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. |
| 30299 |
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] |
| 31004 |
18 Jul 1984 @ 1200 |
--- |
research-mab |
7/18/1984 Thermal Observations - no time noted - Mud Spring – active 184º |
| 31096 |
21 May 1983 @ 1200 |
--- |
research-mab |
May 21 1983 – no time noted ~afternoon - Mud Spring – Translucent grey, heavy boiling from the cente |
| 31304 |
08 Jul 1982 @ 1200 |
--- |
research-mab |
7/8/1982 - “About 1200” - Mud Spring – muddy, splashing boiling, cloudy green-grey |
| 31288 |
07 Jul 1982 @ 1200 |
--- |
research-mab |
7/7/1982 - no time noted - Mud pool & others nearby = constant bubbling |
| 31262 |
10 Jun 1982 @ 1200 |
--- |
research-mab |
6/10-82- no time noted - Mud Spring 171°F not overflowing, muddy grey/tan |
| 31232 |
20 Feb 1982 @ 1200 |
--- |
research-mab |
February 20 1982 - no time noted - Mud Spring 188° green-brown medium turbid H2O that is much clearer than normal. |
| 31177 |
14 Jan 1982 @ 1200 |
--- |
research-mab |
January 14th 1982 - no time noted - Mud Spring 152° bright green slightly turbid |
| 31536 |
30 Aug 1981 @ 1200 |
--- |
research-mab |
Sunday August 30 1981 - no time noted - Mud Spring gray turbid H2O bubbling to 8” 179° |
| 31452 |
02 Aug 1981 @ 1200 |
--- |
research-mab |
Sunday August 2 1981 The Basin Wide Disturbance has occurred! - no time noted - Mud Spring Light green turbid opalescent water that is constantly bubbling 158° |
| 31416 |
06 Jun 1981 @ 1200 |
--- |
research-mab |
Saturday June 6 1981 - no time noted - Mud Spring – gray-beige, calm, no overflow 171 F |
| 31739 |
07 Sep 1980 @ 1200 |
--- |
research-mab |
Sunday Sept 7 1980 - no time noted - Mud Spring – periodic boiling to 1 foot, turbid blue-green – evidence of slight overflow 179°F |
| 31702 |
16 Aug 1980 @ 1200 |
--- |
research-mab |
Sat Aug 16 - no time noted - Mud Spring- Cloudy green and gently bubbling. No overflow. 170°F |
| 31638 |
09 Jun 1980 @ 1200 |
--- |
research-mab |
June 9 1980 - no times - observations made over the week and entered on 9th - Mud Spring- opaque green and bubbling 169ºF |
| 32024 |
11 Oct 1979 @ 1200 |
--- |
research-mab |
October 11 1979 – no time noted - Back Basin...changes since disturbance. Mud Spring is very turbid and is a grey-green instead of aquamarine. |
| 32007 |
28 Sep 1979 @ 1200 |
--- |
research-mab |
September 28 1979 - no time noted - Mud Spring – 177ºF, pale, opaque aquamarine, very gentle boiling |
| 31897 |
17 Aug 1979 @ 1200 |
--- |
research-mab |
Aug 17 1979 - no time noted - Mud Spring - 169ºF – aqua-marine color |
| 31828 |
03 Jun 1979 @ 1200 |
--- |
research-mab |
June 3 1979 - no time noted - Mud Spring is still clearing as is Phillips Cauldron. |
| 31825 |
27 May 1979 @ 1200 |
--- |
research-mab |
May 27 1979 - no time noted - Mud Spring is clearer today and still beautifully blue |
| 32049 |
25 Mar 1978 @ 1200 |
--- |
research-mab |
March 25 1978 - no time noted - Mystic & Mud Springs – full of water, clear blue & beautiful! |