Last Known Eruption
89y 120d 11h 18m ago

Latest Eruptions

Eruption DurationInterval
03 Feb 1932 @ 142645m 1h 1m
03 Feb 1932 @ 13256m 30s 1h 0m
03 Feb 1932 @ 12254m 1h 0m
03 Feb 1932 @ 11254m

Interval Statistics

Interval Count3
Min1h 0m
Max1h 1m
Mean1h 0m
Median1h 0m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
17052 11 May 2021 @ 1520 --- Tara calm, light greenish blue color, overflowing lightly
17048 11 May 2021 @ 1048 --- cb MUCH clearer, color is blue green. a VERY slight trickle of overflow. 3 Trees feature is steaming and producing water down the runoff channel but no visable "eruptive" activity.
17041 10 May 2021 @ 1308 --- User34 Clear, calm, barely overflowing
17021 09 May 2021 @ 1130 --- cb color is still a cloudy milky turquoise blue. The pool has come up a bit but still not overflowing down the runoff channel. The bubbles have decreased is size and quantity. Just a few that break the surface in the "thumb" area and are the size of a Meyer 🍋 lemon!
17013 08 May 2021 @ 1500 --- cb Emerald spring is still very cloudy, milky turquoise blue in color. Much like I've seen Cistern look like! It still has tennis ball-grape sized bubbles breaking the surface and sending out convection waves, mostly along the side closest to the boardwalk. pool is low and NOT in overflow. The 3 Trees feature on the side of Emerald, closest to the boardwalk, has 2 small vents erupting 2 - 3". I call it 3 Trees because there are 3 fallen dead trees and these vents are close to the base of those 3 dead trees.
17009 07 May 2021 @ 1101 --- cb ES is milky turquoise blue in color with 3 areas, on the east side of the pool, that have ping pong ball - tennis ball sized bubbles that break the surface occationally and send out small convection waves. It is not in overflow. The small bubblers that I call "3 Trees" on the edge of the tree line to the south, now has 2 vents that erupt to 2 - 3" and put water down ES runoff channel.
16998 06 May 2021 @ 1933 --- cb ES has ~5 areas along the East side of the pool that have ping pong ball- softball sized bubbles breaking the surface and sending out ripples into the pool. Pool is a cloudy greenish color and is in overflow.
16967 30 Apr 2021 @ 2009 --- MAB Calm, a little visible convection, in overflow left side - South Spouter area steamy
16901 20 Apr 2021 @ 1822 --- MAB in overflow on left channel - visible upwelling - south spouter area steamy
16851 13 Feb 2021 @ 1440 --- Micah Kipple Clear and calm
16844 06 Feb 2021 @ 1405 --- Micah Kipple Nearly clear. No roiling or bubbles.
16842 04 Feb 2021 @ 1600 --- Micah Kipple No longer roiling and bubbling. Returning to (but not quite completely) clear again.
16833 28 Jan 2021 @ 1613 --- Micah Kipple Cloudy. At least two points of bubbling and roiling 1-2 inches along near crater rim.
16827 24 Jan 2021 @ 1547 --- markwolf slightly more opaque and about 1 cm low
16479 29 Oct 2020 @ 0929 --- MAB good overflow in left channel, none on right side. fairly calm but I could hear a few bubbles
16408 11 Oct 2020 @ 1600 --- cb overflowing nicely!
16509 11 Oct 2020 @ 1430 --- jonp Blue-Green color; Steady overflow.
16404 10 Oct 2020 @ 1255 --- cb clear, calm, blueish green and pool low, barely in overflow
16354 06 Oct 2020 @ 1623 --- cb Still clear, calm, in overflow and more turquoise blue than green.
16336 05 Oct 2020 @ 1915 --- cb Emerald Spring is calm, blue green in color and nicely overflowing.
16319 02 Oct 2020 @ 0920 --- cb Emerald is very steamy this morning. It is calm, green/blue and overflowing. FYI: The small feature in the trees to the east of ES runoff channel (by where the boardwalk narrows) that I've referred to as "3 trees" has been active all summer and is really overflowing these past 3 weeks.
16256 25 Sep 2020 @ 0830 --- cb clear, calm and blue green
16208 20 Sep 2020 @ 0915 --- cb Emerald's pool is back to its typical height I've seen all summer and overflowing nicely down its channel
16192 19 Sep 2020 @ 0900 --- cb First time this summer I've seen Emerald BARELY in overflow. The pool is low just a thin, barely observable, trickle of water down its runoff channel. Pool is calm and still greenish blue in color.
16044 05 Sep 2020 @ 0700 08 Sep 2020 @ 2120 underarockphoto With the sole exception of Monday, 17:30 to Tuesday 11:00. Emerald was clear, calm, with light overflow.
15927 31 Aug 2020 @ 2010 --- cb Emerald is overflowing, calm, clear & Emerald green in color. no change.
14534 04 Jun 2020 @ 1138 --- cb calm and in good overflow. The dead tree that used to lean over the extended boardwalk on the south end fell over last night and missed Emerald by "that much".
14510 02 Jun 2020 @ 1840 --- cb ES is clear, calm and emerald in color. pool is high with great overflow
14116 10 Feb 2020 @ 1247 --- Micah Kipple Clear, and overflowing. Very Light, but noticeable convection/upwelling on near side. Only visible in right light.
14106 31 Jan 2020 @ 0951 --- Micah Kipple Clear, calm, and overflowing
13996 01 Nov 2019 @ 1712 --- MAB calm clear w slight overflow in left channel mixing w runoff from the 2018 south spouter. Right side channel filled w snow
13975 25 Oct 2019 @ 1817 --- MAB Beautiful and Calm w slight overflow down left channel
13959 18 Oct 2019 @ 1745 --- MAB calm- slight overflow in left channel
13921 11 Oct 2019 @ 1248 --- underarockphoto Not in overflow. Just at the cusp. Crystal clear blue.
13912 10 Oct 2019 @ 1528 --- underarockphoto Clear and in overflow
13744 18 Sep 2019 @ 1756 --- cb clear calm and in overflow
13725 17 Sep 2019 @ 0800 --- bbev In overflow, clear and calm
13716 16 Sep 2019 @ 1215 --- Polly Emerald is very clear and full. No bubblers nor steam seen in any If the vents around the perimeter.
13702 15 Sep 2019 @ 1738 --- cb in overflow
13683 13 Sep 2019 @ 1600 --- cb pool is just below overflow. Feature to the east in the trees is putting out alot of water into ES runoff channel. ES pool is calm, blue green, and steamy
13617 07 Sep 2019 @ 1309 --- Polly Emerald looks clear & calm. It is overflowing.
13601 02 Sep 2019 @ 1600 --- Polly Emerald’s pool has pulled back. I could not see any runoff. There may have been a tiny boil. Feature to the left is overflowing. Emerald is very clear.
13499 01 Sep 2019 @ 2000 --- Janet Jones Below overflow. Looking at photos, it was in overflow at 1315.
13405 25 Aug 2019 @ 1740 --- WillBoekel clear, calm, and overflowing.
13372 24 Aug 2019 @ 0727 --- cb pool is low and not in overflow. Feature in the 3 fallen trees to the NE is pumping a lot of water into ES runoff channel. Booping to 3".
13825 16 Aug 2019 @ 2100 --- Ben VL Clear and calm. Blue/green color deeper down. Info sign had fallen off. Propped it up against the railing.
13289 16 Aug 2019 @ 1803 --- cb pool is BARELY in overflow. it's clear, blue green in color. Last years feature in the east trees (3 trees spring?) is really pushing out a lot of water into Emeralds runoff channel.
13218 13 Aug 2019 @ 1646 --- cb clear, calm, no bubbles, blue green in color & just BARELY in overflow. Little feature in the base of the 3 dead trees from last year is erupting to 3" with heavy outflow into Emeralds runoff channel.
13157 11 Aug 2019 @ 0745 --- RMichaels Lightly overflowing, calm, and fairly clear.
13135 09 Aug 2019 @ 1514 --- cb pool is coming up. close to overflow. no more bubbles, clear and green again.
13119 09 Aug 2019 @ 0749 --- bbev Almost to overflow, clear, occasional bubbles.
13117 08 Aug 2019 @ 1732 --- bbev ~1" below overflow.
13104 08 Aug 2019 @ 0741 --- bbev Still below overflow but has come up some. few bubbles.
13095 07 Aug 2019 @ 1723 --- cb more clarity in the whole pool. still down 3 - 4" from overflow. A few areas with random bubbles breaking the surface. Last years thing on the SE shoulder in the trees is erupting/pulsing to ~3".
13084 07 Aug 2019 @ 0727 --- bbev Still 3-4" below overflow, cloudy, few if any bubbles, but very steamy and hard to see pool.
13074 06 Aug 2019 @ 1705 --- cb fewer bubbles and the pool is still very low. ( ~4" below overflow) it is greenish along the edges but mostly a milky turquoise blue.
13062 06 Aug 2019 @ 0740 --- bbev Still 3-4" below overflow. A few less bubbles.
13032 04 Aug 2019 @ 1908 --- bbev 3-4" below overflow, still having large bubbles on SW side of pool.
13000 03 Aug 2019 @ 0730 --- cb not much change from yesterday. pool is 4 - 5" below overflow. milky blue green in color. Occasional tennis ball sized bubbles breaking the surface on the east edge.
12964 02 Aug 2019 @ 1735 --- bbev Pool is down 3-3.5 " below overflow. Bubbling in same areas.
12975 02 Aug 2019 @ 0920 --- MAB low - no bubbles or overflow. very steamy
12947 02 Aug 2019 @ 0749 --- bbev Remains cloudy and 1.5" below overflow. Still bubbling but difficult to see due to heavy geyser fog.
12927 01 Aug 2019 @ 1731 --- bbev 1.5-2" below overflow, bubbling near side of pool. Cloudy, torquoise pool.
12918 01 Aug 2019 @ 0955 --- cb still a milky turquoise blue color with random tennis ball sized bubbles that break the surface along the NE edge of the pool. pool is low and not in overflow. Last years break out by the dead trees is quieter today but the 1/2 dollar sized hole to the N of it is more active.
12897 31 Jul 2019 @ 1547 --- cb ES is now a milky/cloudy aqua blue color. Is not in overflow. still has bubbles breaking the surface anywhere from 1/2" - 3" in diameter along the edge closest to the bw and by the runoff channel. Feature from last year south of the thumb is erupting/pulsing constantly to 3".
12884 31 Jul 2019 @ 0715 --- cb Same areas have the same bubbles as yesterday afternoons observation. A little hole to the right of last years small breakout south of Emeralds thumb is gurgling and sputtering up to an inch and putting out convection waves.
12873 30 Jul 2019 @ 1635 --- cb 5 areas, in the thumb and around the edge of the pool closest to the boardwalk there are softball sized bubbles breaking the surface and sending out moderate sized convection waves into the pool! Pool is still Emerald green in color.
12853 28 Jul 2019 @ 1031 --- ypcaribou Deep blue middle, greenish toward edges, yellow on "shelf" around edge. Full.
12525 19 Jul 2019 @ 1058 --- cb pool is low and just barely in overflow.
12438 11 Jul 2019 @ 1545 --- cb calm and NOT in overflow. runoff channel dry from the pool down 10'. The breakout to the south has a good flow of water and is putting water down emeralds runoff channel.
12021 29 Jun 2019 @ 0750 --- cb ES is very low and barely in overflow. The exposed edges of the pool are caked white
12031 28 Jun 2019 @ 2010 --- Polly Emerald is clear & calm and has very little overflow.
12420 26 Jun 2019 @ 1054 --- Polly Emerald Spring is clear and calm.
11852 17 Jun 2019 @ 0803 --- udo Clear and overflowing.
11825 16 Jun 2019 @ 0955 --- cb early this morning ES was WAY to steamy to view. @0956 it is still very steamy and hard to see into the middle of the pool. As far as i can tell it is calm and green in color. The feature that broke out last summer is appears hotter. The runoff channel is white again. (green earlier in the spring)
11712 10 Jun 2019 @ 1809 --- Polly Pool looks clear.
11386 27 May 2019 @ 0615 27 May 2019 @ 1500 Kyle clear and calm
11343 24 May 2019 @ 2039 --- Kyle clear, mostly calm with very light bubbling near SE edge
11307 22 May 2019 @ 0720 --- Kyle clear and calm
11321 21 May 2019 @ 0825 --- Kyle clear and calm
11323 20 May 2019 @ 0625 --- Kyle clear and calm.
11230 30 Apr 2019 @ 1110 --- Polly Emerald Spring is clear and calm with some overflow.
11087 26 Apr 2019 @ 1210 --- cb Emerald Spring is a BEAUTIFUL turquoise greenish color and calm.
11042 21 Apr 2019 @ 0730 21 Apr 2019 @ 1730 RMichaels Clear and calm every time I passed by during this time range.
10726 04 Nov 2018 @ 1034 --- MAB Beautiful and calm. Snow in the westerly channel. Spouter to the south still putting out water, but in the blizzard and so steamy no pulses or airborne water could be seen.
10686 29 Oct 2018 @ 1439 --- udo overflowing continuously. thing in trees next to it is quietly overflowing.
10625 19 Oct 2018 @ 1234 --- MAB Calm with tiniest of overflow on easterly channel, no water in W channel. Water is still being produced by New South Spouter but no splashes, pulses or otherwise moving water could be seen.
10603 13 Oct 2018 @ 0800 --- Suzanne clear, no boiling
10369 17 Sep 2018 @ 1240 --- Siegmund Slight overflow, very blue. Spot in woods along runoff channel steaming and overflowing but not erupting.
10212 15 Sep 2018 @ 1110 --- cb clear, calm and a beautiful turquoise blue color with patches of green on the rocks within the pool.
10187 13 Sep 2018 @ 1820 --- cb ES seems to be cycling between barely in overflow and barely below overflow.
10177 13 Sep 2018 @ 1150 --- cb Emerald Spring is just below overflow and the new breakout by the south thumb is overflowing down Emeralds overflow channel but barely erupting.
10172 12 Sep 2018 @ 1845 --- bbev Clear, calm and 1-2" below overflow. Bubbler overflowing down runoff.
10169 12 Sep 2018 @ 1227 --- bbev Clear, calm and overflowing.
10158 11 Sep 2018 @ 1357 --- udo Overflowing. South spritzer is i.e. and overflowing.
10140 10 Sep 2018 @ 1815 --- bbev At overflow, bubbler is putting water into runoff, but Emerald is not. Otherwise, clear and calm.
10129 10 Sep 2018 @ 0803 --- bbev Clear and overflowing, bubbler in trees still putting out water.
10116 08 Sep 2018 @ 0807 --- WillBoekel In overflow, clear, calm and blue/green in color
10107 07 Sep 2018 @ 1952 --- bbev Still clear, calm and overflowing. Slight bubbling and continued overflow from feature to SE.
10071 06 Sep 2018 @ 1830 --- cb Emerald has reached overflow and has changed color to a beautiful blue.
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