Last Known Eruption
28y 297d 12h 55m ago

Interval Statistics

Interval Count15
Min1h 8m
Max285d 19h 12m
Mean45d 17h 35m
Median9d 21h 35m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
35079 10 Jun 2024 @ 1230 --- SantaFe108 Lightly overflowing. 2 point boil on left side and weaker 1 point boil on the right.
34965 07 Jun 2024 @ 1139 --- CrisG nice boiling x2 to left of the rock
34683 26 May 2024 @ 0649 --- ypcaribou Pleasant bubbling in 2 spots to left of rock. tiny bubbles to right
34579 16 May 2024 @ 1736 --- cb vent farthest from the bw has a nice ~6-8" blooping boil. other 2 are ~2-4" boil
34328 24 Apr 2024 @ 1032 --- DanS Blooping from multiple vents on both sides of tall island.
34245 19 Apr 2024 @ 1237 --- MAB light boil right side of rock - stronger 3-4 point boil left of rock - trickle overflow at boardwalk - a little less activity from both sides on my way out after 1800
34081 01 Mar 2024 @ 0930 --- JR Quiet, full, clear, bubbly.
33918 24 Jan 2024 @ 1440 --- JR Decent, audible bubbling/roiling out of all vents. No other changes.
29314 31 Oct 2023 @ 1643 --- MAB better visibility but fairly quiet
29305 31 Oct 2023 @ 1321 --- MAB bad visibility but boil on left side bigger - small ripples not waves - trickle overflow
29042 22 Oct 2023 @ 1240 --- SantaFe108 Lightly overflowing, blooping boil in both vents.
28981 21 Oct 2023 @ 1544 --- JR Full, roiling producing ripples on surface. Roiling from 3 distinct spots.
28936 20 Oct 2023 @ 1642 --- MAB 2 point boil left side - smaller boil right side - not many waves & trickle overflow
28911 20 Oct 2023 @ 1119 --- MAB good boil both sides but only a trickle ovfl
28853 17 Oct 2023 @ 1631 --- MAB more light waves
28845 17 Oct 2023 @ 1149 --- MAB pretty good waves from both vents - steady overflow at bw
28790 14 Oct 2023 @ 1610 --- MAB same 3 vents but stronger on the left side - trickle overflow is a tad stronger
28787 14 Oct 2023 @ 1335 --- MAB 3 point boil - trickle overflow
28560 30 Sep 2023 @ 0732 --- ypcaribou In overflow
27280 28 Jul 2023 @ 1249 --- SantaFe108 In overflow, good rolling left side boil, right side has weaker, more intermittent boiling.
26846 04 Jul 2023 @ 1713 --- MAB 2 pt boil on left side - 1pt boil on right - steady overflow under bridge
26420 17 Jun 2023 @ 1615 --- MAB strong left boil w moderate overflow
26316 14 Jun 2023 @ 1641 --- CrisG lightly overflowing. nice 2 point left sided boil.
26223 10 Jun 2023 @ 1507 --- CrisG light left sided boil
25870 28 May 2023 @ 2019 --- SantaFe108 Trickling overflow. Left vent having splashy boiling ~6 inches tall with just light bubbling from right vent.
25654 21 May 2023 @ 1404 --- SantaFe108 Lightly overflowing. Left vent is occasionally having vigirous bubbling with small splashing. Right vent only has trickling bubbles.
25516 18 May 2023 @ 1006 --- mhreed Clear green and very lightly bubbling.
25489 16 May 2023 @ 1830 --- Ajw Water bubbling up from 3 vents in pool
25473 15 May 2023 @ 2006 --- ypcaribou in overflow
25049 27 Feb 2023 @ 1506 --- MAB trickle overflow from left side boil
24570 30 Oct 2022 @ 1431 --- ypcaribou In slight overflow. Gentle bubbling in L vent only
24535 29 Oct 2022 @ 0853 --- MAB trickle runoff at bridge - left vent not too vigorous - too steamy to see right vent
24380 14 Oct 2022 @ 1815 --- MAB both vents pushing - steady overflow under boardwalk
24260 05 Oct 2022 @ 1411 --- cb pool is clear, greenish with a 3" blooping boil on both sides if the large center rock.
24069 24 Sep 2022 @ 1148 --- CrisG Vigorous left sided boils x2, right side smaller boils.
24070 24 Sep 2022 @ 1148 --- CrisG Vigorous left sided boils x2, right side smaller boils.
24036 23 Sep 2022 @ 1605 --- MAB left vent boil - steady overflow
23691 07 Sep 2022 @ 1953 --- MAB quiet
22990 02 Aug 2022 @ 1339 --- cb pool is ~2" below the high water mark with a vigorous blooping boil to 4" on the NE side of the rock outcropping. Small bubbles on the other side of the rock. color is green
22746 20 Jul 2022 @ 1947 20 Jul 2022 @ 1951 nails 2 consistent boils on left, the one furthest from boardwalk is more vigorous. 1 boil on right, less vigorous.
22660 17 Jul 2022 @ 1508 --- MAB 2pt boil left side - 1pt right side with steady overflow
22085 23 Jun 2022 @ 1614 --- cb More active boil than previously observed on both side of the "island rock". Blooping to ~4"
21704 03 Jun 2022 @ 1212 --- MAB trickle overflow - both vents roiling
21480 25 May 2022 @ 0828 --- TSBryan minimal bubbling, overflow barely a trickle
21292 15 May 2022 @ 1926 --- MAB boil from both sides - moderate overflow
21294 15 May 2022 @ 1300 --- MAB light boil - left side only
21206 06 May 2022 @ 1931 --- MAB less boil between the vent rocks than this a.m. - still light boil to the left - moderate ovfl at BW bridge
21202 06 May 2022 @ 1311 --- MAB strong ovfl - boils between vent rocks and left side of rocks too
21058 23 Apr 2022 @ 1329 --- DanS Blooping boils with small splashes from far left vent.
21025 18 Apr 2022 @ 1305 --- MAB trickle overflow
20335 06 Nov 2021 @ 0817 --- MAB visible boil w gentle waves
20306 04 Nov 2021 @ 0838 --- MAB very light boil - small ripples - steamy
20258 31 Oct 2021 @ 0844 --- MAB slight overflow
20202 29 Oct 2021 @ 0859 --- MAB minimal boil - slight ovfl
20100 24 Oct 2021 @ 1743 --- MAB trickle overflow - no boil seen by vents
20113 24 Oct 2021 @ 0932 --- MAB very small boil seen over one vent - not strong - tiny ripples on pool
20088 22 Oct 2021 @ 0902 --- MAB too steamy to see vent area but lightest of light ripple waves and no sounds
20046 19 Oct 2021 @ 1310 --- cb no change. pool is a yellowish blue green, clear & roiling bubbles on either side of the rock
20017 17 Oct 2021 @ 1725 --- MAB no boil seen - trickle overflow w foamy junk below bridge
19896 05 Oct 2021 @ 1750 --- MAB pretty good 3 point boil w steady overflow
19228 01 Sep 2021 @ 1627 --- MAB trickle overflow
18832 04 Aug 2021 @ 0855 --- MAB light boil but virtually no overflow
18334 09 Jul 2021 @ 0845 --- MAB moderate overflow - Branch Sp in a Very vigorous boil via sound and waves - too steamy to see a thing
18275 05 Jul 2021 @ 1531 --- cb pool is about 2" below high water mark. Roiling boil 2 - 4" on either side of the rock formation
18262 03 Jul 2021 @ 0849 --- MAB moderate overflow - Branch Sp was quiet
18150 28 Jun 2021 @ 1946 --- MAB very light overflow
18156 28 Jun 2021 @ 0834 --- MAB moderate overflow
18091 25 Jun 2021 @ 1139 --- MAB moderate overflow
17928 19 Jun 2021 @ 0900 --- MAB strong overflow
17802 15 Jun 2021 @ 1109 --- cb blooping boil 2"-3". in good overflow
17799 14 Jun 2021 @ 0902 --- MAB strong overflow
17462 04 Jun 2021 @ 0924 --- MAB good overflow
17205 27 May 2021 @ 1953 --- MAB fairly strong overflow- small waves on pool
17183 25 May 2021 @ 0907 --- MAB light overflow
17142 19 May 2021 @ 0923 --- MAB light overflow
17121 17 May 2021 @ 2019 --- MAB in overflow
17120 17 May 2021 @ 0928 --- MAB in overflow
17034 09 May 2021 @ 1302 --- cb pool is a murky yellow/ lime green color with a 2" roiling boil over both main vents.
16972 30 Apr 2021 @ 0922 --- MAB light overflow
16890 20 Apr 2021 @ 0942 --- MAB quiet
16349 06 Oct 2020 @ 1322 --- cb light emerald green in color with 3 mildly roiling points on the east side of the rock. Occational roiling activity on the other side of the rock.
16267 26 Sep 2020 @ 1602 --- cb clear, green in color with a weak boil
15554 13 Aug 2020 @ 1118 --- cb Pool is SO clear and beautiful! average boil over the vent at the edge of the big rock.
14924 10 Jul 2020 @ 1155 --- bbev Moderate boil and light runoff from very clear pool.
14602 11 Jun 2020 @ 1749 --- cb pool is a pretty, clear, emerald green color with 2 rolling bubblers that break the surface on the N side of the big rock in the pool.
13386 25 Aug 2019 @ 0633 --- ypcaribou Splashing up to left of long rock in at least 2 spots maybe 6" to a foot. Light overflow on right side of channel.
13383 24 Aug 2019 @ 1944 --- MAB Strongest boil I've seen in a long time - left of the rock. Normal low boil to the right of the rock.
13010 03 Aug 2019 @ 1955 --- Stephen_Gemar Boiling in a couple of spots to the left of the big boulder, and light roiling in 1 spot to the right of the big boulder. A little water trickling into the runoff channel.
29124 11 Jul 2019 @ 1200 --- research-mab 7/11/2019 -no time noted - Monarch GC low
12007 28 Jun 2019 @ 1053 --- ypcaribou Water trickling into runoff channel. Roiling in blue water to left of big boulder.
12006 28 Jun 2019 @ 0638 --- ypcaribou No water flowing into runoff channel. Water at left edge of pool about an inch lower than prior observations since May 2018.
11619 07 Jun 2019 @ 0944 --- CrisG Boiling to 6-8" left of the large center rock. Pool gently overflowing. Water is still green but is clearer than "normal".
11383 27 May 2019 @ 0933 --- jkgood In overflow. Spluttering and boiling to 6”
11670 24 May 2019 @ 0915 --- Ben VL Boiling a few inches high in two or three spots (plus some smaller boiling spots) near and along the left side of the rock that sticks out of the middle.
11316 22 May 2019 @ 0657 --- Kyle overflowing, gentle boiling 8-10 inches to left of center rock in crater
11329 21 May 2019 @ 0938 --- Kyle pool calm and quiet. barely overflowing
11332 20 May 2019 @ 0915 --- Kyle quiet pool, very light overflow
29346 07 Aug 2018 @ 1200 --- research-mab 8/7 - no time noted - Monarch clearing
9519 07 Aug 2018 @ 1147 --- bbev Water in crater is clearer than I have seen this year, no change in runoff.
19283 05 Jul 2018 @ 1201 --- research-mab 7-5-2018 MONARCH BBEV 1201 See Note under Steamboat Porcelain Basin still very active, but appears drier. Congress pool down 4-6" from yesterday, still boiling vigorously. Emerald Springs and Monarch runoff appears to have increased. Monarch geyser crater has clearer water and much fuller. Corperal boiling, runoff wet. Cistern did not look any different, boiling steadily, just at overflow. Emerald Springs is still cloudy but with noticeably less boiling. https://geysertimes.org/note.php?id=9039
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Baseline does not exist.