| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 38784 |
03 May 2025 @ 1359 |
--- |
MAB |
down another 6in since last week - 2 or 3 pt boil of light brown green water |
| 38696 |
27 Apr 2025 @ 1154 |
--- |
MAB |
dropped a few feet since last week - more agitated and not the pretty blue green of last week more a light brown khaki color - 2 point large boils |
| 38512 |
19 Apr 2025 @ 1311 |
--- |
MAB |
murky green center shading to French gray muddy suspension on edges- fairly low in smooth mud part of vent |
| 38290 |
23 Feb 2025 @ 1530 |
--- |
K.Cooper |
3ft below rock wall. beautiful cloudy turquoise blue |
| 38173 |
08 Jan 2025 @ 1101 |
--- |
mwolf |
Blue. Water level several inches lower than 2 weeks ago when full to brim and turbid brown. |
| 38008 |
15 Dec 2024 @ 1619 |
--- |
K.Cooper |
Very full - within two inches of overflow and muddy brown |
| 37918 |
07 Nov 2024 @ 1033 |
--- |
mhreed |
Light muddy color, boiling in center but not very vigorous. Water level slightly elevated from last observations in late October. |
| 37858 |
31 Oct 2024 @ 0841 |
--- |
MAB |
Swiss miss color with wide steady boils - none too violent. No photos too steamy to really see. |
| 37927 |
29 Oct 2024 @ 1250 |
--- |
MAB |
From photos: Even higher than last visit - pool agitated across the entire surface not a specific area of boil |
| 37926 |
25 Oct 2024 @ 1520 |
--- |
MAB |
From photos: Over one foot higher than on Oct 15. Same ugly brown agitated water. |
| 37704 |
24 Oct 2024 @ 1141 |
--- |
SantaFe108 |
A little higher than last note, still low and churning muddy water. Boiling seems more constant and weaker. |
| 37629 |
15 Oct 2024 @ 0923 |
--- |
MAB |
Low - DARK gray with constant violent boils |
| 37509 |
10 Oct 2024 @ 1323 |
--- |
SantaFe108 |
Continues to have boiling cycles from several feet below the rim. Muddy gray water. Locomotive Spring ie. |
| 36796 |
06 Sep 2024 @ 1304 |
--- |
cb |
milk chocolate muddy water. pool is low ~5' below high water mark. has a ~3-4' violent boil |
| 35069 |
10 Jun 2024 @ 0923 |
--- |
SantaFe108 |
Low, churning grey muddy water. Locomotive Spring splashing 1-3' high. |
| 34581 |
16 May 2024 @ 1800 |
--- |
cb |
A good ~10' below the high water mark. Chocolate milky color w a vigorous blooping boil that at its height, occationally bloops to maybe 2'. |
| 34526 |
11 May 2024 @ 1123 |
--- |
jkgood |
Chocolate milk, 6-8” boil |
| 34377 |
28 Apr 2024 @ 1225 |
--- |
DanS |
Boiling churning grey liquid |
| 34243 |
19 Apr 2024 @ 1142 |
--- |
MAB |
fairly low down into the more vertical part of the vent pool area - light brown strong steady bubbling boils over a wide area - no larger bursts = high pressure fumarole behind Congress still active |
| 34176 |
11 Apr 2024 @ 1000 |
--- |
JR |
A bit low, brown, muddy, roiling. |
| 33915 |
24 Jan 2024 @ 1531 |
--- |
JR |
Strong roil in center, muddy water. Water level still about 2' below overflow. |
| 33830 |
16 Jan 2024 @ 1500 |
--- |
JR |
Has dropped an additional foot from the last note. Brown opaque water with a decent bubbling in the center. |
| 33771 |
11 Jan 2024 @ 1200 |
--- |
ypcaribou |
Very full, grey to clear with nice gas activity in the center. (Time random. During day tour.) |
| 33732 |
02 Jan 2024 @ 1330 |
--- |
JR |
About 1' below the rim, no longer overflowing. A murky greenish brown. Slight bubble in center. |
| 32925 |
15 Dec 2023 @ 1448 |
--- |
Samsara |
I had heard a report that Congress Pool’s water level was high. When I walked to it, I saw water seeping through the rocks in the outflow, not quite an active stream. The pool is fairly clear a light blue in color. |
| 31694 |
28 Nov 2023 @ 1300 |
--- |
JR |
Congress pool is no longer a mud pot….It is slightly murky blue-green colored water. A gentle bubbling in the middle. The pool is now approximately 20 feet across. It is filled so high that it is slightly overflowing into the Solfatara area. Gentle runoff channel can be seen going all the way into Colloidal pool. Wildly different from even just 3 weeks ago. I noticed this last week that it was full but it was too steamy to tell the details. It is now very clear and obvious that this feature has changed drastically from what we saw since April this year. |
| 29316 |
31 Oct 2023 @ 1720 |
--- |
MAB |
Violent and Low - no seeming pattern to the bursting which could reach 1/3 up the crater |
| 29045 |
22 Oct 2023 @ 1258 |
--- |
SantaFe108 |
Churning muddy water at low pool. Locomotive Spring splashing. |
| 28982 |
21 Oct 2023 @ 1610 |
--- |
JR |
4 or more feet below rim. Strong muddy roil. Low even compared to mid summer. Observed constant roil as opposed to cycles. |
| 28884 |
19 Oct 2023 @ 1412 |
--- |
DanS |
Active muddy boiling and churning |
| 28852 |
17 Oct 2023 @ 1619 |
--- |
MAB |
Violent chocolate milk color - last Sat the bigger bursts were all dark mud color - these are uniformly light brown |
| 28749 |
12 Oct 2023 @ 1705 |
--- |
JR |
Water level fluctuations continue. Lower than a lot of this summer but not the lowest. Perhaps 3' below the brim. Strong roiling mud cycles continue every minute. |
| 29196 |
01 Oct 2023 @ 0905 |
--- |
research-mab |
10/01 - 0905am: - Congress Pool seems very hot, muddy, roiling cycles are every few minutes/30 seconds. Water level below 3 feet from rim |
| 28449 |
24 Sep 2023 @ 1446 |
--- |
DanS |
Low, muddy with vigorous variable churning. |
| 29195 |
23 Sep 2023 @ 1200 |
--- |
research-mab |
9/23 - no time noted - Congress is very full & vigorously bubbling |
| 28300 |
17 Sep 2023 @ 1205 |
--- |
SantaFe108 |
Churning muddy water to about ~4 feet every minute or so then calming down to a few inches high. |
| 28153 |
09 Sep 2023 @ 1050 |
--- |
steve |
Congress Pool is erupting. The background is a steady bubbling/boiling to 2-4 feet but about once a minute it is more forceful to 6-10 feet, perhaps higher. |
| 29193 |
24 Aug 2023 @ 1200 |
--- |
research-mab |
8/24 - no time noted - - Congress filling, calm, then aggressive roil |
| 29197 |
23 Aug 2023 @ 1200 |
--- |
research-mab |
8/23 - no time noted - Incredible activity out of Congress Pool. High water level and gently boiling turned into a minor (eruption?) that ejected water 3-4 feet through a construction somewhat in the middle. Afterwards, the level was a ft lower – AC |
| 29192 |
16 Aug 2023 @ 1500 |
--- |
research-mab |
8/16 300 pm Congress water level 4” below stick, was active but became quiet – no bubbles 3 times/30 seconds |
| 29191 |
16 Aug 2023 @ 0900 |
--- |
research-mab |
8/16 9:00 am Stick still at Congress – very active |
| 27620 |
15 Aug 2023 @ 1543 |
--- |
cb |
pool still looks like thick chocolate milk with a violent roiling, bursting eruption up to ~8-10'. pool is very low in the vent |
| 29190 |
08 Aug 2023 @ 1200 |
--- |
research-mab |
8/8 - no time noted - Congress very high |
| 29189 |
07 Aug 2023 @ 1000 |
--- |
research-mab |
8/7 1000am Congress has really filled up |
| 29188 |
06 Aug 2023 @ 1200 |
--- |
research-mab |
8/6 - no time noted - Congress Pool is full! Seems to be recycling with several seconds of boiling activity followed by a few seconds of relative calm. |
| 29187 |
04 Aug 2023 @ 1200 |
--- |
research-mab |
8/4/2023 - no time noted - Unusual behavior out of Congress Pool. Short moments of aggressive boiling that shoots water a couple of feet high. May have a constriction? |
| 27364 |
31 Jul 2023 @ 1028 |
--- |
MAB |
ugly violent low |
| 27342 |
30 Jul 2023 @ 0657 |
--- |
ypcaribou |
Almost empty pool with gray, muddy water violently splashing from low in pool. |
| 27183 |
23 Jul 2023 @ 1743 |
--- |
mhreed |
Diarrhea mode still engaged. Water level below the branch but having occasional bursts to mid-crater height. |
| 29199 |
14 Jul 2023 @ 1200 |
--- |
research-mab |
7/14 - no time noted - Congress was very extremely low! |
| 29198 |
13 Jul 2023 @ 1040 |
--- |
research-mab |
7/13 - Congress water level extremely low ~ 1040 am AC |
| 27009 |
11 Jul 2023 @ 1710 |
--- |
cb |
Congress' pool has dramatically dropped. Its water level is a few feet above the vent. It is chocolatey muddy brown color and erupting with aggressive 🤔churning, roiling bursts that splash to 5+ feet. |
| 29200 |
09 Jul 2023 @ 1200 |
--- |
research-mab |
7/9 - no time noted - Congress pool very low |
| 26869 |
06 Jul 2023 @ 1905 |
06 Jul 2023 @ 1913 |
nails |
Gray water boiling in low pool. Calms down about once per minute, then splashes back up 2 to 4 feet.. |
| 26840 |
04 Jul 2023 @ 1430 |
--- |
MAB |
lower with steady violent wide chocolate color boil |
| 29201 |
24 Jun 2023 @ 1000 |
--- |
research-mab |
6/24 1000-1100 rove - Congress Pool returning to a more normal water level but still roiling mud. |
| 26615 |
23 Jun 2023 @ 1125 |
--- |
cb |
pool is still a muddy chocolate brown, violently roiling boil ~4'. Not spiking to 15'+ like observed in the early spring. |
| 28948 |
16 Jun 2023 @ 1000 |
--- |
research-mab |
(no time given } 6/16
Congress pool still very active, no rest in sight. |
| 28734 |
11 Jun 2023 @ 1200 |
--- |
research-mab |
6/11 - no specific time
Congress Pool low but still aggressive mudpot |
| 25924 |
30 May 2023 @ 1120 |
--- |
MAB |
still violent near perpetual dark muddy splashing - some more voluminous and sustained - base water level may be lower than my previous visit - will compare photos |
| 25876 |
28 May 2023 @ 2138 |
--- |
SantaFe108 |
Low and furiously surging muddy water with occasional larger burst. Steam making flashlight hard to use. |
| 25651 |
21 May 2023 @ 1035 |
--- |
SantaFe108 |
Still low with constant surging of muddy water, occasional big burst as well. |
| 25517 |
18 May 2023 @ 1139 |
--- |
mhreed |
Low water level. Muddy with a constant, violent roil. Occasional bursts to height of crater rim. |
| 28731 |
04 May 2023 @ 1300 |
--- |
research-mab |
Congress Pool is currently a violent mudpot. Rising and lowering water level, shooting mud 5 feet or so
[no specific time] |
| 25044 |
27 Feb 2023 @ 1336 |
--- |
MAB |
blue green slightly murky but pretty - occasional ping pong bubbles |
| 24504 |
28 Oct 2022 @ 1600 |
--- |
MAB |
Low - green but not too murky with a few small bubbles |
| 24197 |
03 Oct 2022 @ 0927 |
--- |
WillBoekel |
pool is low and a murky green |
| 29105 |
27 Sep 2022 @ 1200 |
--- |
research-mab |
9/27/2022 - no time noted - Congress looks low and blue |
| 24067 |
23 Sep 2022 @ 0945 |
--- |
CrisG |
water level approx 1.5 ft from high water mark. water a milky teal color. quarter to half dollar sized bubbling. |
| 24068 |
23 Sep 2022 @ 0945 |
--- |
CrisG |
water level approx 1.5 ft from high water mark. water a milky teal color. quarter to half dollar sized bubbling. |
| 29104 |
18 Sep 2022 @ 1200 |
--- |
research-mab |
9/18/2022 - no time noted - Congress was low and clear |
| 23565 |
04 Sep 2022 @ 1330 |
--- |
cb |
pool is a murky seafoam green color, dime/half dollar sized bubbles breaking the surface ~ in the center. Water level is difficult to describe, ~1.5' below high water mark. |
| 29103 |
04 Sep 2022 @ 1200 |
--- |
research-mab |
9/04 /2022 - no time noted - Congress is low and not so murky |
| 29102 |
25 Aug 2022 @ 1200 |
--- |
research-mab |
8/25/2022 - no time noted - -Congress Pool getting murky again |
| 23369 |
23 Aug 2022 @ 1830 |
--- |
MAB |
watery green - small bubbles in 2 spots |
| 29111 |
20 Aug 2022 @ 1200 |
--- |
research-mab |
8/20/2022 - no time noted - Congress is blue! |
| 29090 |
13 Aug 2022 @ 1200 |
--- |
research-mab |
8/13 - no time noted - Congress Pool blue & milky |
| 23057 |
05 Aug 2022 @ 1331 |
--- |
cb |
pool is higher than last observation by ~1'. It is a silty light brown/green color with just a few bubbles breaking the surface. mostly calm pool. |
| 22858 |
26 Jul 2022 @ 1212 |
--- |
cb |
pool is down another 1' from last note. down 3' from the high water mark along the edge. 2 vigorous boiling points and color is milk chocolate |
| 22663 |
17 Jul 2022 @ 1457 |
--- |
MAB |
2ft below top of cracked mud - dirty brown color w 5pt boil- heaviest boils on NW |
| 29077 |
08 Jul 2022 @ 1200 |
--- |
research-mab |
- no time noted - 7/8/22/2022 – Congress Pool and Scummy low water levels |
| 22399 |
08 Jul 2022 @ 1142 |
--- |
cb |
Pool down another 6", 2' below high water ring. It's milk chocolate color with a roil boil in the center and on the end by the bw |
| 22270 |
01 Jul 2022 @ 1337 |
--- |
MAB |
2 pt boil light brown in color - 1ft below cracked mud |
| 22245 |
30 Jun 2022 @ 1214 |
--- |
cb |
A tad more of a boil than last observation. 2 main roiling boils in front of the lg rock in the centerish area of the pool. roiling boil to 3". |
| 22164 |
27 Jun 2022 @ 1214 |
--- |
MAB |
steady boil mud puddle brown |
| 22121 |
25 Jun 2022 @ 1249 |
--- |
cb |
Pool is a latte light brown color, water is still high and it has 2 roiling boiling areas in the center of the pool. |
| 22079 |
23 Jun 2022 @ 1548 |
--- |
cb |
CHANGED again!! last time I looked at Congress it was turquoise blue! Now it is a .... ranger green color, kinda gray green & murky! Has a moderate boil & pool is down ~10" from last observation |
| 22075 |
15 Jun 2022 @ 1507 |
--- |
cb |
Change! The pool is a BEAUTIFUL turquoise blue color, clear with a 2 point bubbler (smaller than a boil) sending out small convection waves. water level is about 3' below the rim. |
| 29067 |
04 Jun 2022 @ 1200 |
--- |
research-mab |
6/4/2022 - no time noted - - Congress looking very blue instead of previous muddy/dark |
| 21707 |
03 Jun 2022 @ 1200 |
--- |
MAB |
color changed from my last view - more of a greenish blue and not mud puddle brown - fairly quiet |
| 21482 |
25 May 2022 @ 0755 |
--- |
TSBryan |
very low, slight bubbling, slate gray water |
| 21445 |
23 May 2022 @ 1250 |
--- |
MAB |
stronger boil in several spots than last week and light mud puddle color water looks lower - will compare photos and edit |
| 21243 |
11 May 2022 @ 1240 |
--- |
MAB |
watery brown - not much boil |
| 21028 |
18 Apr 2022 @ 1252 |
--- |
MAB |
low - sizzly bubbles - light brown |
| 20339 |
07 Nov 2021 @ 1630 |
--- |
mwolf |
clear, blue, high, calm, zero bubbles |
| 20193 |
29 Oct 2021 @ 1711 |
--- |
MAB |
CLEAR blue green- can even see into the vent - water level is above that bottom level of deeply cracked mud |
| 20074 |
21 Oct 2021 @ 1412 |
--- |
mwolf |
clear, green, calm, with occasional little bubbles |
| 20045 |
19 Oct 2021 @ 1244 |
--- |
cb |
weird. Pool is a clear, greenish color much like Colloidal Spring. Hardly any boil just a random golf ball sized bubble that slowly makes it way to the surface and pops. Water level is about 6" below high water/mud line. |
| 19923 |
06 Oct 2021 @ 1602 |
--- |
cb |
pool is greenish brown, low water level and 2 very small bubblers |
| 19832 |
01 Oct 2021 @ 1750 |
--- |
MAB |
Low but NO boil - pool was in shadow but looked greenish brown |