Last Known Eruption
47y 324d 11h 31m ago

Latest Eruptions

Eruption DurationInterval
04 Aug 1976 @ 140029y 361d 19h 45m
15 Aug 1946 @ 171510y 2d 17h 15m
15 Aug 1936 @ 0000 A

Interval Statistics

Interval Count2
Min10y 2d 17h 15m
Max29y 361d 19h 45m
Mean19y 364d 18h 30m
Median19y 364d 18h 30m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
33520 22 Oct 2023 @ 1308 --- mhreed "Colloidal Pool boiling on NW end" from https://geysertimes.org/note.php?id=29049
33517 17 Oct 2023 @ 1604 --- mhreed "COLLOIDAL POOL all lobes same color an ugly taupe - low and barely flowing past Sunday & even less flowing under the bw [boardwalk] to Scummy" from https://geysertimes.org/note.php?id=28848
33487 01 Oct 2023 @ 0910 --- research-mab 10/01/2023 - 0910 am Hurricane Vent is quiet, steaming. No bubbles. - Colloidal is steamy and murky
33488 24 Jun 2023 @ 1030 --- research-mab 6/24/2023 - approx inferred time - 1000-1100 - No change- Hurricane / Colloidal
33489 04 Sep 2022 @ 1200 --- research-mab 9/04/2022 - no time noted - Colloidal Pool looks opalescent but not a lot of colloids
33516 18 Aug 2022 @ 1843 --- mhreed "Sunday and Colloidal both appear over full - channel into Scummy has water" from https://geysertimes.org/note.php?id=23254
33515 01 Jul 2022 @ 0835 --- mhreed A "steady stream of water" is flowing from Colloidal into Scummy Pool. See https://geysertimes.org/note.php?id=22275
33490 18 Jun 2022 @ 1200 --- research-mab 6/18 Post Flood: - no time noted - Colloidal pool area not as vivid
33514 16 Oct 2021 @ 1202 --- mhreed "Sunday and Colloidal spring's [Colloidal Pool's] pools have cleared & are no longer murky/muddy pools." from https://geysertimes.org/note.php?id=19998
33513 06 Oct 2021 @ 1413 --- mhreed "Colloidal Pool was mostly blue green and fairly clear for the past few weeks. Today it looks like thick chocolate milk. it has a few boils on the north end of the pool closest to Constant." from https://geysertimes.org/note.php?id=19920
33512 02 Oct 2021 @ 1313 --- mhreed "Colloidal pool is overflowing into it [Scummy Pool]." from https://geysertimes.org/note.php?id=19858
33511 23 Sep 2021 @ 1600 --- mhreed "Colloidal pool is very high, turquoise blue and overflowing into Scummy pool. @ 1716 both pools dropped 3" below high water mark and Colloidal pool has dropped also and not overflowing into Scummy." from https://geysertimes.org/note.php?id=19705
33510 16 Sep 2021 @ 1257 --- mhreed "Colloidal pool runoff is running into SP [Scummy Pool]." from https://geysertimes.org/note.php?id=19616
33509 13 Sep 2021 @ 0850 --- mhreed "Colloidal Pool looks like it did something- all 3 pools are gunky brown" from https://geysertimes.org/note.php?id=19546
33492 07 Sep 2014 @ 1200 --- research-mab 9/7/2014 - no time noted - Colloidal Pool – the pool closest to the boardwalk has turned a milky gray color compared to the milky blue in the rest of the pool
33493 03 Jul 2006 @ 1200 --- research-mab 7/32006 - no time noted - Colloidal Pool Clear
33494 03 Mar 2001 @ 1200 --- research-mab 3/03/01 - no time noted - Basinwide disturbance is going on... Colloidal pool is muddy.
33523 03 Mar 2001 @ 1200 --- mhreed No time noted. "Basinwide disturbance is going on [...] Colloidal pool is muddy." See additional observations from this date at https://geysertimes.org/date.php?date=2001-03-03
33496 20 Jul 2000 @ 1200 --- research-mab 7/20/2000 - no time noted - The “strange activity” that you are seeing is weak Disturbance.... Scummy Pool, Colloidal Pool and Sunday Geyser are all “muddy”.
33497 09 Sep 1997 @ 1200 --- research-mab 9/9/1997 - no time noted - Congress still empty. Colloidal Pool- and Sunday geyser are more transparent and blue than their previous opaque opalescence. Less silica, more sulfur ? {? is in original mab}
33699 30 Sep 1995 @ 1200 --- research-mab no times end of Sept here = Colloidal Pool-- This feature turned muddy brown the first four days of disturbance. Other than that, it remained unchanged.
33698 29 Jul 1995 @ 0602 --- research-mab Disturbance activity "hit" Norris on 29 July 1995. This observer was sitting at Ledge Geyser at 06:02 when nearby Scummy Pool had what can only be described as "...a big, chocolate brown burp!" Scummy's surface surged to about 3 feet and the discharge was chocolate brown and thick. At the same time, Sunday Geyser turned muddy brown as did Colloidal Pool. Gosa SPUT Vol 9 No 5 October 1995: “Recent Disturbance Activity in the Norris Geyser Basin” reported by Smokey Sturtevant
33697 30 Sep 1993 @ 1200 --- research-mab no time no date - end Sept here - Colloidal Pool – opalescent blue and relatively quiet with a few gentle boils, slight water fluctuations are common
33696 30 Sep 1992 @ 1200 --- research-mab no time no date - end Sept here - Colloidal Pool – slight water fluctuation a couple to times [sic] during the season, otherwise still opalescent blue and relatively quiet. - Congress Pool – lots of noise, but no water to be seen.
33498 02 Aug 1992 @ 1200 --- research-mab 8/2/1992 - no time noted - Porcelain Basin seems to have lowered water levels in Son of Scummy and Colloidal Pool. More mud is showing.
33695 30 Sep 1991 @ 1200 --- research-mab no time no date - end Sept here - Colloidal Pool - color changed from turbid gray to slightly murky blue water boiling heavily in the bottom. By May the water level had dropped out of sight and boiling could be heard very low in the chambers. Water level stayed low all season.
33501 24 Jul 1991 @ 1200 --- research-mab 7/24/91 - no time noted - The new fumerole near Colloidal Pool is no longer venting, but it spouting ~ 1 foot.
33503 19 Jun 1991 @ 1200 --- research-mab 6/19/91 - no time noted - Colloidal Pools as brilliant blue as I’ve ever witnessed.
33694 30 Sep 1990 @ 1200 --- research-mab no time no date - end of Sept here - Colloidal Pool – continues to be quite turbid and gray in color [Sept 1st Disturbance same report- Colloidal Pool increased twofold in size]
33504 06 Sep 1990 @ 1200 --- research-mab 9-6-1990 - no time noted - Disturbance continues... Rains have stopped. Sunny and hot today. Colloidal Pool about twice its normal size.
33693 03 Sep 1990 @ 1201 --- research-mab 9-03-90 - no time noted - Colloidal Pool – very vigorous opaque white churning pool as opposed to milky blue & white & only moderately turbid before the disturbance.
33505 03 Sep 1990 @ 1200 --- research-mab 9/3/90 - no time noted - Colloidal Pool, Sunday geyser and the pool between Sunday Geyser and the Boardwalk are silty and over flowing. More new frying pan fumeroles on the opposite side of the board walk.
33692 30 Sep 1989 @ 1200 --- research-mab no time no date end Sept here - Colloidal Pool – very turbid with many floating bubbles after 7/11
33506 29 Sep 1989 @ 1200 --- research-mab 9/29/1989 - no time noted - Congress Pool is very high with water now covering all vents up the sides. Colloidal Pool is clear & blue!
33507 07 Sep 1989 @ 1200 --- research-mab 9/7/1989 - no time noted - Colloidal Pool – very muddy at surface with intense bubbling.
33681 15 Aug 1989 @ 1200 --- research-mab 8/15/89 - no time noted - Colloidal pool looks fuller today – my imagination?
33680 11 Jul 1989 @ 1200 --- research-mab Tues July 11 1989 - no time noted - The pools in Scummy to Colloidal Areas area ll full of floating bubbles, today is the 1st I’ve ever noticed this.
33691 30 Sep 1987 @ 1200 --- research-mab no time no date - end Sept here - Colloidal Pool (13): Remained a quiet opalescent blue pool.
33690 26 Jun 1986 @ 1800 --- research-mab 6-26-1986 - no time noted - Colloidal Pool – light, moderately cloudy turquoise blue water with complex bottom profile consisting of 5 main interconnected funnel shaped basins. Est. discharge 5gpm. T=143º
33678 21 Aug 1985 @ 1200 --- research-mab 8/21/1985 -no time noted - Sunday Geyser Pool = 183º = bubbling (low) in the center of the pool Colloidal Pool = 178º- pool looked all calm, no main bubbling or boiling in the pool.
33525 08 May 1985 @ 1200 --- mhreed No time noted. Colloidal Pool is "opalescent blue and fairly calm."
33689 30 Sep 1984 @ 1200 --- research-mab no time no date end of Sept here - Colloidal Pool (13): remained a quiet opalescent blue pool all summer
33688 11 Feb 1984 @ 1800 --- research-mab 2-11-1984 - no time noted - Colloidal Pool Very turbid light gray green; est disch 5 gpm
33677 21 May 1983 @ 1000 --- research-mab May 21 1983 – no time noted ~morning - Colloidal Pool– Little change from its usual appearance: light aqua. Moderate boiling.
33687 20 May 1983 @ 1200 --- research-mab no time noted - Sunday Geyser - For a period of several days, Sunday splashed heavier than usual from the west end of its pool accompanied by muddying of the water. Strangely, Colloidal Pool was virtually unaffected
33686 30 Sep 1982 @ 1200 --- research-mab Anonymous notes Summer 1982 - no time no date end of Sept here - COLLOIDAL POOL was a beautiful light sky blue most of the summer its 6/30 temp was 158°, its 7/6 temp 159°, at which time it was murky brown from the disturbance, its temp on 7/29 was 169°, with gentle bubbling in the center and an opalescent blue color.
33676 22 Jul 1982 @ 1200 --- research-mab July 22 1982 - no time noted - Colloidal Pool 171º, light blue milky water bubbling in the center.
33527 06 Jul 1982 @ 1345 --- mhreed Bracketed comments mine. "The CHANGE in features [disturbance?] occurred between 1230 and 1345 – for both basins. Colloidal – turbid and boiling, light brown color"
33526 15 Jan 1982 @ 1200 --- mhreed No time noted. "Colloidal Pool 178º bright blue slightly turbid & calm H2O"
33529 11 Dec 1981 @ 1200 --- mhreed No time noted. "Colloidal Pool 168º [F] slightly turbid blue/green and calm"
33528 02 Aug 1981 @ 1200 --- mhreed No time noted. "The Basin Wide Disturbance has occurred! [...] Colloidal - 187º 2 vents boiling to 1 foot – very dark grey-brown turbid water"
33674 05 Jul 1981 @ 1200 --- research-mab Sunday July 5 1981 - no time noted - Colloidal Pool seems to be hotter than usual.
33673 02 Jun 1981 @ 1200 --- research-mab Tuesday June 2 1981 - no time noted - Colloidal Pool and Hurricane Vent were both partially drained – Rick H said both were higher than the previous days level. Water color gray turbid
33539 29 May 1981 @ 1200 --- mhreed No time noted. "Water levels in Colloidal & Hurricane [down] 75 cm."
33537 30 Sep 1980 @ 1200 --- mhreed No time noted. "Colloidal Pool + Hurricane Vent were muddy swiss cheesy which surprised me."
33685 30 Sep 1980 @ 1200 --- research-mab no time no date - end of Sept here- Colloidal Pool was an aquamarine color most of the summer and gently overflowing. During the first week of September, it turned to a turbid blue-white. Colloidal responded to the September 15, disturbance by becoming an opaque gray which darkened through the day. It boiled vigorously from three locations. Activity remained riled up through September.
33535 22 Sep 1980 @ 1200 --- mhreed No time noted. "One week following the disturbance, some porcelain basin observations [...] Colloidal Pool – still bubbling with vigor, opaque gray-white"
33672 19 Sep 1980 @ 1200 --- research-mab Friday Sept 19 1980 - no time noted - Blue Geyser/Iris Geyser– still muddy grey, but considerably less “thick”. Primrose springs– still muddy grey. Colloidal Pool– bubbling less intensely but still thick.
33671 15 Sep 1980 @ 1200 --- research-mab Monday September 15, 1980 - no time noted - Annual Basin Wide Disturbance has occurred… or better yet, is currently occurring....k. Colloidal Pool had turned opaque grey. As the day progressed most of the pools became increasingly turbid.
33532 09 Sep 1980 @ 1200 --- mhreed No time noted. "blue, turbid water, overflowing 170°[F]"
33533 19 Aug 1980 @ 1200 --- mhreed No time noted. "bubbling less intensely but still thick"
33670 31 Jul 1980 @ 1200 --- research-mab July 31, 1980 - no time noted - Colloidal pool is gently boiling today
33530 08 Jun 1980 @ 1200 --- mhreed No time noted. "Colloidal Pool – lovely aquamarine color, calm 188ºF"
33545 14 Oct 1979 @ 1200 --- mhreed No time noted. "Algae is beginning to grow again in the runoff channels of Porcelain basin. Colloidal Pool and Hurricane Vent have turned blue once again."
33543 27 Sep 1979 @ 1200 --- mhreed No time noted. "Colloidal Pool – 192ºF – boiling to 1 foot. Opaque greyish yellow-green color"
33508 20 Sep 1979 @ 1800 --- mhreed "muddy-brown grey boiling in three locations to one foot. All trace of its beautiful blue color gone. 192ºF"
33541 03 Sep 1979 @ 1200 --- mhreed No time noted. "Colloidal Pool boiling vigorously, cloudy water. Hurahh! It finally lived up to its name this summer."
33669 28 Jul 1979 @ 1000 28 Jul 1979 @ 1130 research-mab July 28 1979 Colloidal Pool 152º {noted in log 7-28 sometimes temps were collected during the week then compiled in log so temperature time is unknown} - Colloidal Pool started boiling rapidly at center – During 10:00 walk nothing. During 11:30 walk boiling
33683 30 Jun 1979 @ 1200 --- research-mab - no time or date - end of month here - CONGRESS POOL is down several feet and continues to drop slowly. As is usual, activity in the pool has become stronger and more periodic with the drop in water level. One of the prettiest features is COLLOIDAL POOL which displays an intense sky blue
33668 25 May 1979 @ 1200 --- research-mab May 25 1979 - no time noted - Colloidal Pool – beautiful blue temp at NE corner 170
33667 21 Sep 1977 @ 1200 --- research-mab 09/21/1977 - no time noted - Colloidal Pool is becoming blue again!
33551 04 Sep 1977 @ 1200 --- mhreed No time noted. "Colloidal’s water output has dropped an inch or so"
33666 22 Aug 1977 @ 1200 --- research-mab 08/22/1977 -no time noted - More signs of the declining output of water: Swiss Cheese is nearly empty. Several vents below Porcelain Terrace Springs are dry. Very little runoff from Colloidal
33665 20 Aug 1977 @ 1200 --- research-mab Aug 20, 1977 - no time noted - Colloidal is quite active approximately 6-7 boiling areas. Rising & falling.
33548 19 Aug 1977 @ 1200 --- mhreed No time noted. "Colloidal boiling in several spots"
33547 28 Jul 1977 @ 1200 --- mhreed No time noted. Temperature measured at 182 °F.
33664 07 Jul 1977 @ 1200 --- research-mab 07/07/1977 - no time noted - Jetsam, the Lewis Mudpot area and Colloidal have all returned to their typical blue colors.
33663 29 Jun 1977 @ 1200 --- research-mab 06/29/1977 - no time noted - Colloidal has become very murky
33662 14 Jun 1977 @ 1200 --- research-mab 06/14/1977 - no time noted - Colloidal Pool – less water discharge & splashing has subsided. Blue in coloration.
33661 22 Sep 1976 @ 1200 --- research-mab 09/22/1976 - no time noted - Colloidal Pool seems to be getting calmer every day. It’s now a faint green color, little activity was seen.
33660 21 Sep 1976 @ 1200 --- research-mab 09/21/1976 - no time noted - Colloidal still has its boiling spot but the activity is greatly reduced.
33558 13 Sep 1976 @ 1200 --- mhreed No time noted. "still very active at its main boiling spot"
33557 10 Sep 1976 @ 1200 --- mhreed No time noted. Bracketed comments mine. "has returned to its pre-Aug 31 [pre-disturbance] activity"
33556 07 Sep 1976 @ 1200 --- mhreed No time noted. "only 2 active boiling spots now. One only goes to minor heights (~6”). The other is the main active spot."
33502 04 Sep 1976 @ 1200 --- mhreed No time listed. "At Colloidal, only the main boiling spot remains active. The other 3 are seen occasionally, but only go 2-3’ high."
33555 31 Aug 1976 @ 1200 --- mhreed No time noted. Bracketed comments mine. "We are for sure in the grip of an end-of-the-season change [disturbance]! Porc Basin has gone bananas! [...] Colloidal Pool has gone crazy. There are 3-4 boiling spots, all of which are constantly going. The main one is 'erupting' as high as 10 feet! This causes large waves to surge over the pool’s edge & under the boardwalk."
33658 31 Aug 1976 @ 1030 --- research-mab 08/31/1976 - inferred approx time - 10) Colloidal Pool has gone crazy. There are 3-4 boiling spots, all of which are constantly going. The main one is “erupting” as high as 10 feet! This causes large waves to surger over the pool’s edge & under the boardwalk. 11) Africa in noisy steam phase at 1030
33657 28 Aug 1976 @ 1200 --- research-mab 08/28/1976 - no time noted - Colloidal seems much more active, at least in terms of the height the boiling patch has been reaching.
33656 23 Aug 1976 @ 1500 --- research-mab 08/23/1976 - inferred time - Colloidal continues to cause large waves of water to surge over its edge. It’s pouring out!
33655 11 Aug 1976 @ 1200 --- research-mab 08/11/1976 - no time noted - Colloidal still boiling furiously every few minutes
33654 03 Aug 1976 @ 1200 --- research-mab 08/03/1976 Colloidal boiling furiously at 1200
33554 02 Aug 1976 @ 1230 --- mhreed "Colloidal Pool gently boiling at 1230. No large waves being generated."
33553 01 Aug 1976 @ 1200 --- mhreed No time noted. "Blue hasn’t been seen in action at all today, and Colloidal Pool has been unusually quiet. The water level appears to have declined about 4 [inches]." Unclear if water level comment refers to Blue or Colloidal.
33651 01 Aug 1976 @ 1200 --- research-mab 08/01/1976 - no time noted - Colloidal Pool has been unusually quiet. The water level appears to have declined about 4”.
33650 31 Jul 1976 @ 1200 --- research-mab 07/31/1976 - no time noted - Colloidal Pool – seems to be enlarging. Noticed that sinter deposits around rim were cracking and slumping toward pool.
33649 28 Jul 1976 @ 0900 --- research-mab 07/28/1976 - inferred approx a.m. time - Colloidal Pool quiet this a.m.
33648 26 Jul 1976 @ 1200 --- research-mab 07/26/1976 - no time noted - Colloidal Pool still very active most of the a.m. There appears to be bubbling almost continually, but periodically there’s a large surge of activity that can be easily seen from the museum.
33647 24 Jul 1976 @ 1508 --- research-mab 07/24/1976 1508 Colloidal boiling vigorously
33552 23 Jul 1976 @ 1200 --- mhreed No time noted. "Both Colloidal Pool and Congress Pool seem to be boiling higher today. Colloidal to 3’, Congress to 2’."
33646 23 Jul 1976 @ 1200 --- research-mab 07/23/1976 - no time noted - Both Colloidal Pool and Congress Pool seem to be boiling higher today. Colloidal to 3’, Congress to 2’
No attachments for this geyser.
Baseline does not exist.