Last Known Eruption
140d 15h 56m ago

Latest Eruptions

Eruption DurationInterval
18 May 2022 @ 1533 ie37y 260d 28m
09 Sep 1984 @ 1504:1931m 2s 31m 2s
09 Sep 1984 @ 1433:1726m 42s 27m 31s
09 Sep 1984 @ 1405:4623m 50s 33m 56s
09 Sep 1984 @ 1331:5028m 18m
09 Sep 1984 @ 1313 ie>12m 50s 2d 23h 28m
06 Sep 1984 @ 1345 ie>30m

Interval Statistics

Interval Count6
Min18m
Max37y 260d 28m
Mean6y 104d 16h 18m
Median32m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
24262 05 Oct 2022 @ 1420 --- cb Started at 1420 with overflow & roiling boil, murky gray on color. ended @ 1421
24100 25 Sep 2022 @ 0819 25 Sep 2022 @ 0825 MAB possibly just ending upon arrival w tiny bubbles from low water level - sm bubbles 0821 a tad stronger for 30s then quiet - heavy surge 0823 for 1m59s - seems not as heavy as yesterday but could be the foggy visibility
24056 24 Sep 2022 @ 1544 --- MAB low and quiet but can't stay
24065 24 Sep 2022 @ 1137 --- MAB bubbly but not the strong heavy boil - dropped out of ovfl 1138 - super quiet no bubbles @1140 - teensy bubbles resume 1141 - heavy boil comes on strong @1143 for 1m50s
24035 23 Sep 2022 @ 1607 --- MAB low and quiet w tiny bubbles - 1609 heavy boil commences with instantaneous outwash - boil stops 1610 - no bear tracks visible between Monarch & Branch
24046 23 Sep 2022 @ 0850 --- MAB Full w tiny bubbles but not a lot of overflow - 0851 big bulging boil began w immediate outwash
23969 20 Sep 2022 @ 1849 20 Sep 2022 @ 1904 ypcaribou 1849 on arrival, constant rolling "boil" with rippling all the way to edge of pool. Hearing a hissing or sizzly noise from nearby, I think to right of pool. 1853, water dropped below runoff channel. 1854 rising into runoff. Pool stopped bubbling and started a full sizzle. 1855 huge roil up that led to constant wave action to edges and into overflow. Looks like a bowl of soft Jello being shaken. 1857 back to center bubble and dropped out of overflow. 1900 refill starting. 1901 bubbling stopped and jiggle started. 1902 full on bubbling jiggle and into overflow. This thing is cool to watch! Oh, color is blue with yellow pool so green. 1904 back below overflow. At no time did it drain - drop below overflow means out of the runoff channel. That's as far as it dropped. Headed back to Cistern!
23643 07 Sep 2022 @ 1004 --- MAB full but not flowing - may have just quieted
23393 24 Aug 2022 @ 1751 --- MAB well below overflow - light center boil south shoulder vents glurging
23398 24 Aug 2022 @ 0905 --- MAB quite agitated- when steam cleared could see a wide roil
23333 21 Aug 2022 @ 1222 21 Aug 2022 @ 1250 ypcaribou Water is opaque, dirty beige. Small bubbling in middle causing ripples to edge. Just below overflow to "V" that leads to runoff channel. Feature to left with 2 holes is gurgling and burping but no water seen. 1226 Large roiling a foot or so in diameter began, splashing to a foot, pool filled fully and overflowed. Returned to quiet by 1228. 1230 filling. 1231 roiling and splashing to overflow. Dropped. 1236 fill and roil and splash. Overflow. Calm and drop by 1238. 1240 filling, 1241 start, overflow, 1242 calm and drop, 1243 water down from V. 1245 filling, 1246 start, calming 1247. Droppong. Out of V at 1249. When I say drop, its just to top of pool edge down from V for overflow. Does not drain. Thunder heard, dark clouds rolling in. Up the hill I go!
23257 18 Aug 2022 @ 0916 --- MAB low & fairly quiet - faint boil
22991 02 Aug 2022 @ 1343 --- cb overflowing with a vigorous boil. Feature 6' to the left is gurgling, no visable water.
22889 27 Jul 2022 @ 1846 --- MAB low and quiet - moved on quickly
22900 27 Jul 2022 @ 1219 --- MAB dead calm then started asap immediately in overflow
22864 26 Jul 2022 @ 1248 --- cb color is a light milky greenish color with a weak boil and just below overflow. Feature with 2 vents that resemble Bear Claw, toward Trio sink area, are gurgling and thunking. no visable water
22662 17 Jul 2022 @ 1507 --- MAB steady boil w strong ovfl
22268 01 Jul 2022 @ 1912 --- MAB low - quiet - no outwash
22273 01 Jul 2022 @ 1347 --- MAB heavy boil watery green brown
22244 30 Jun 2022 @ 1209 --- cb pool low, not overflowing, no boil
22157 27 Jun 2022 @ 1839 --- MAB violent boil
22163 27 Jun 2022 @ 1226 --- MAB heavy boil w good runoff - light brown color
22083 23 Jun 2022 @ 1611 --- cb vigorous boil, muddy color, overflowing
21700 03 Jun 2022 @ 1930 --- MAB light boil with waves - barely in overflow
21706 03 Jun 2022 @ 1210 --- MAB WAY low - fairly calm
21479 25 May 2022 @ 0824 --- TSBryan quiet, slightly below overflow
21440 23 May 2022 @ 1851 --- MAB heavy center boil w good flow
21453 23 May 2022 @ 1300 --- MAB below ovfl and just pulsing into the channel with only light center convection when boil began - pushing waters down the channel immediately
21340 17 May 2022 @ 0844 --- mhreed Murky grey, slight boil, just at overflow.
21291 15 May 2022 @ 1927 --- MAB stronger boil than at 1300 but still no overflow - either low again or still
21295 15 May 2022 @ 1258 --- MAB low - watery green - very few bubbles - no flow
21234 11 May 2022 @ 1928 --- MAB trickle of ovfl down the channel but pool is low and quiet
21242 11 May 2022 @ 1250 --- MAB murky green - below overflow & quiet
21196 06 May 2022 @ 1933 --- MAB mild center boil just inching to overflow- when suddenly strong center boil commenced and strong flow went down the channel - got FLIR - ok that was fun and good timing
21203 06 May 2022 @ 1307 --- MAB way low w bubbles - receiving cool waters from old road grade across the trail
21089 26 Apr 2022 @ 1851 --- MAB low with only quiet convection
21101 26 Apr 2022 @ 1301 --- MAB very low - well below ovfl - a few tiny bubbles
21026 18 Apr 2022 @ 1303 --- MAB steady boil - in ovfl - dirty green color
20324 06 Nov 2021 @ 1609 --- MAB another walkup to a calm pool with a few bubbles - while standing there heavy boil begins
20336 06 Nov 2021 @ 0815 --- MAB light boil - pool below overflow
20292 04 Nov 2021 @ 1639 --- MAB calm - just below overflow- as I wrote it down I could see overflow just creeping down the channel - just a few bubbles at that point
20309 04 Nov 2021 @ 0836 --- MAB full w slight ovfl - light bubbles - 0837 vigorous center boil began
20243 31 Oct 2021 @ 1707 --- MAB wet ovfl - full with convection but no boiling
20259 31 Oct 2021 @ 0842 --- MAB full but not boiling w no overflow upon arrival - bpil started tail end of same minute
20195 29 Oct 2021 @ 1637 --- MAB light boil - well below overflow
20201 29 Oct 2021 @ 0857 --- MAB light boil - slight ovfl
20166 28 Oct 2021 @ 1709 --- MAB a tad lower not quite in overflow
20165 28 Oct 2021 @ 1529 --- MAB light boil slight overflow
20102 24 Oct 2021 @ 1744 --- MAB center boil some ovfl
20114 24 Oct 2021 @ 0929 --- MAB Quiet no boil - pool edges showing 6in to 1ft - no ovfl obviously
20082 22 Oct 2021 @ 1735 --- MAB light center boil - not quite reaching overflow
20092 22 Oct 2021 @ 0859 --- MAB quiet - no boil - no overflow
20016 17 Oct 2021 @ 1726 --- MAB overflow - convection then boil started w my walkup {water visible in the 2nd hole on the shoulder}
20028 17 Oct 2021 @ 0912 --- MAB center boil w overflow - {breakout on south shoulder audible boil but no water visible }
19947 10 Oct 2021 @ 1658 --- MAB light center boil - brownish green color
19954 10 Oct 2021 @ 0924 --- MAB busy center boil - gray green color
19916 05 Oct 2021 @ 1752 --- MAB Strong loud boil with heavy waves heard but not seen at 0851 - at 1752 observed moderate boil - pool was a brownish green color
19907 03 Oct 2021 @ 1325 --- ypcaribou Vigourous roil in middle. Slight overflow. Milky but transparent light sea glass green.
19908 03 Oct 2021 @ 0736 --- ypcaribou Mostly calm pool with gumball-sized bubbles floating up. Possibly just below overflow but too steamy to tell. Slightly milky but trsnsparent light sea glass green
20494 20 Jun 2012 @ 1200 --- research-mab 6/20/2012 “Branch Spring” by Minute Geyser murky; clear yesterday [generic day time]
20495 24 Jun 2000 @ 1200 --- research-mab 6/24/2000 Dr Nordstrom - USGS doing research at Minute and pool next to it (Branch Spring?) - monitored pH & temperature Minute – Boiling 7.19 pH Branch – 80° 3.19 pH He says it may be because the cooler more acidic is drawing water from closer to the surface and hotter more neutral from lower down [generic day time]
20496 20 Sep 1998 @ 1200 --- research-mab 9/20/1998 Branch Spring 172ºF (not as hot as I thought) [generic day time]
20497 13 Sep 1998 @ 1200 --- research-mab 9/13/1998 The spring (I believe unnamed) just beyond Minute appears to be superheated. I’ll measure it tomorrow. {see 9-30 entry mab} {Sketch map with arrow “This spring is named “Branch Spring”} [generic day time]
20528 07 May 1992 @ 1517 --- research-mab 5/7/92 {mushroom in log} – 1517 boiling steadily with a strong overflow
20527 26 Apr 1992 @ 1200 --- research-mab 4/26/1992 {mushroom in log} – quiet, murky [generic day time]
20526 16 May 1991 @ 1200 --- research-mab (5/16/91) Note about Minute Geyser includes ‘lower vent completely filled with water making a pool that goes nearly to adjacent Mushroom Pool’ confirming mis-identification of mushroom thru 1998 [generic day time]
20498 06 Aug 1988 @ 1200 --- research-mab 8/6/1988 Pool to S of Minute - milky blue in color; gentle boiling in center [generic day time]
20525 24 Aug 1987 @ 1200 --- research-mab 8/24/1987 {mushroom in log} - greenish color, lots of boiling in the center of the pool. It is milky so that I can’t see into the water more than 1’ or so [generic day time]
20524 14 Sep 1984 @ 1200 --- research-mab 9/14/1984 seen erupting [no duration of observation - generic day time]
20523 13 Sep 1984 @ 1200 --- research-mab 9/13/1984 seen erupting [no duration of observation - generic day time]
20522 11 Sep 1984 @ 1200 --- research-mab 9/11/1984 light boil only [no duration of observation - generic day time]
20521 09 Sep 1984 @ 1312 --- research-mab 9/9/1984 seen erupting
20520 04 Sep 1984 @ 1200 --- research-mab 9/4/1984 light boil only [no duration of observation- generic day time]
20519 29 Aug 1984 @ 1200 --- research-mab 8/29/1984 light boil only [no duration of observation - generic day time]
20518 28 Aug 1984 @ 1200 --- research-mab 8/28/1984 erupting [no duration of observation - generic day time]
20517 24 Aug 1984 @ 1200 --- research-mab 8/24/1984 continuous light boil only [no duration of observation - generic day time]
20514 21 Aug 1984 @ 1200 --- research-mab Aug 21 1984 UNNG#18 - became active as a geyser on August 21st - Before this it remained a generally clear greenish pool. The few recorded eruptions consisted of boiling to 2" - 3" with moderate discharge. The water level drops about 2" after the eruption. Recorded intervals ranged between 27½ to 34 minutes, with durations of 22½ to 28 minutes - periods of activity seemed to be related with the disturbances of 8/19, 8/27, 9/6, & 9/14 [generic day time]
20516 21 Aug 1984 @ 1159 --- research-mab 8/21/1984 periodic activity 1st seen [generic day time]
20515 20 Aug 1984 @ 1200 --- research-mab 8-20-1984 {RP unng 18} The pH on 8/20 was between 3.0 & 3.4 - during times when this was an active geyser, the water turned a very slightly milky green
20513 12 Jul 1984 @ 1200 --- research-mab 7/12/1984 Minute splashing vent 202° - old vent 148° - Branch {Mushroom in log} 172° [generic day time]
20512 08 Jul 1984 @ 1200 --- research-mab 7/8/1984 Branch {Mushroom in log} Spring 174º F – greenish yellow color – bubbling from vent [generic day time]
20511 08 Jan 1983 @ 1200 --- research-mab January 8 1983 Branch Spring 164º overflowing [generic day time]
20510 20 Feb 1982 @ 1200 --- research-mab February 20 1982 Branch Spring 164° green turbid H2O, overflowing slightly [generic day time]
20509 14 Jan 1982 @ 1200 --- research-mab January 14th 1982 Mushroom Geyser 118º bright green algae lined orange ring around outside. I think that mushroom has seen its better days. R.I.P. [both included before the Mushroom name was mistakenly transferred to Branch 1984-1998] - - - Branch Spring boiling more vigorously than usual green turbid H20 180º [generic day time]
20508 30 Aug 1981 @ 1200 --- research-mab Sunday August 30 1981 Branch green-blue with continual small bubbling, slight overflow 166° [generic day time]
20507 20 Sep 1980 @ 1200 --- research-mab Saturday September 20 1980 Branch Spring– normal turbidity 168ºF, slight overflow [generic day time]
20506 17 Jul 1980 @ 1200 --- research-mab July 17, 1980 “Branch Spring” - Murky grey green with small overflow – 174ºF [generic day time]
20505 21 Sep 1979 @ 1200 --- research-mab Friday September 21 1979 More end of summer changes! “Branch Spring” - murky green, not much different. 164ºF [generic day time]
20504 05 Jul 1979 @ 1200 --- research-mab July 5 1979 Minute Geyser – active vent 201º spraying water to 3 ft. Old vent- few bubbles 143ºF - - - “Branch Spring” (The pool S.E. of Minute Geyser) 170ºF [generic day time]
20503 24 Jun 1979 @ 1200 --- research-mab June 24 1979 Sunday The pool to the southeast of Minute Geyser is very turbid this afternoon, a change from morning [generic day time]
20502 01 Apr 1978 @ 1200 --- research-mab 04/01/1978 Blue-green pool next to Minute (not the vent one foot away from Minute) was quite full, producing generous runoff, and bubbling gently but constantly. [generic day time]
20501 24 Jul 1976 @ 1200 --- research-mab 07/24/1976 Minute Geyser 204º (new name) Green Branch 169º (Pool near Minute) [first use of name – skipping other varieties such as Branch Pool with just a temp listed but they do exist - mab] [generic day time]
20500 27 Sep 1975 @ 1200 --- research-mab 09/27/1975 Overflow was also occurring periodically in circular spring next to Minute Geyser. The several intervals observed were ~ 2 min duration of filling (~20 sec), overflowing and draining (down about 3”). There was ~45 sec of quiescence between these periods of activity. However, there was some fluctuation of the durations of each section of activity [generic day time]
20499 21 Aug 1975 @ 1200 --- research-mab 08/21/1975 unnamed pool next to Minute geyser on trail – is now muddy, was almost a clear green color. Boiling has also increased here, both in area & intensity [generic day time]
No attachments for this geyser.
Baseline does not exist.