Last Known Eruption
53y 272d 16h 51m ago

Latest Eruptions

Eruption DurationInterval
23 Aug 1967 @ 0845

Interval Statistics

Not enough entries to compute statistics.

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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
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.
2789 24 Apr 2016 @ 1500 --- sfavor Mud Spring looked like it had a large eruption with spray approximately 30' uphill.
7377 27 Oct 1967 @ 1800 --- research-mab 10/27/1967 Chocolate Fountain – overflowing slightly. Still ebbing and flowing. Boiling mildly from both vents.
7373 10 Oct 1967 @ 1800 --- research-mab 10/10/1967 Chocolate Fountain – full far above pool edges. Has cut runoff channel on South, boiling mildly with water ebbing and flowing. Color is lighter brown.
7366 27 Sep 1967 @ 1800 --- research-mab 09/27/1967 Chocolate Fountain – no evidence of any major activity, but erosion and mud coating around the pool indicates that the pool probably fills and overflows as far as 3 ft from the normal edge of the pool. A runoff is developing to the southwest. Sections of the pool’s bank have caved in, enlarging the pool on the south, southeast, and northwest sides.
7353 18 Sep 1967 @ 1800 --- research-mab 09/18/1967 Chocolate Fountain appears quiet. Mud dried on the logs surrounding the pool. Root Spring – still normal temp 164º
7351 16 Sep 1967 @ 1800 --- research-mab 09/16/1967 Chocolate Fountain surging over the rim. Looks as if there have been some big ones down there.
7349 15 Sep 1967 @ 1800 --- research-mab 09/15/1967 Chocolate Fountain water level high, fresh mud indicating large eruptions.
7339 12 Sep 1967 @ 1800 --- research-mab 09/12/1967 Chocolate Fountain – full and overflowing on north side. No runoff however. The pool level seems to remain static although surges of boiling still occur every two or three minutes. I don’t believe there was rain yesterday to raise the water level as much as it has risen (6 -10 inches)
7326 11 Sep 1967 @ 0800 --- research-mab 09/11/1967 Chocolate Fountain appears to have erupted again. Ground wet and muddy for about 10 ft on all sides. {no specfic time}
7336 31 Aug 1967 @ 1800 --- research-mab 08/31/1967 Chocolate Fountain seems to be slowing up. No evidence of recent large bursts this morning. I have seen no large ones in three days and have had no reports of large ones from visitors. The mud takes a long time to dry out. Mud cracks are appearing in the mud while it still appears to be quite damp.
7324 29 Aug 1967 @ 1800 --- research-mab 08/29/1967 Chocolate Fountain still active. Root Spring still drained, Temp 200º
7322 28 Aug 1967 @ 1800 --- research-mab 08/28/1967 Chocolate Fountain – not quite as active as yesterday.
7319 24 Aug 1967 @ 1800 --- research-mab 08/24/1967 Chocolate Fountain still putting up strong eruptions.
7317 22 Aug 1967 @ 0830 --- research-mab 08/22/1967 Ed’s mud geyser shows evidence of a recent large eruption at 8:30 am. Placed 3 new markers there – uphill from geyser ranging from 5 ft to 10 ft away from pool.
7337 21 Aug 1967 @ 1800 --- research-mab 08/21/1967 Placed pile of dirt about 3 ft up from Ed’s mud geyser as a marker at 11:00 am. Geyser quiet at that time but showing evidence of recent burst to 7 ft from pool. Marker placed yesterday had been washed out. 5:15 pm ~ marker placed this morning washed out.
7316 20 Aug 1967 @ 1800 --- research-mab 08/20/1967 Ed’s mud geyser is bursting along merrily.
7315 19 Aug 1967 @ 1800 --- research-mab 08/19/1967 * New activity* The “mud spring” in the Back Basin has been putting mud some 30 feet from the pool. The activity started some time early this am. Check Leigh’s maps for location #94
No attachments for this geyser.
Baseline does not exist.