Last Known Eruption
20y 278d 2h 53m ago

Latest Eruptions

Eruption DurationInterval
16 Jul 2003 @ 1115 min18h 5m
15 Jul 2003 @ 1710 min13y 316d 2h 30m
05 Sep 1989 @ 14403y 126d 40m
03 May 1986 @ 1400 ie299d 19h 30m
07 Jul 1985 @ 1830 A296d 10h 6m
14 Sep 1984 @ 08243h 21m
14 Sep 1984 @ 05031h 8m 3h 31m
14 Sep 1984 @ 01321h 6m 29d 4h 53m
15 Aug 1984 @ 20393h 39m
15 Aug 1984 @ 17001h 11m 3h 15m
15 Aug 1984 @ 13451h 4m 3h 38m
15 Aug 1984 @ 10071h 8m 10d 14h 45m
04 Aug 1984 @ 19222h 59m
04 Aug 1984 @ 16231h 14m 3h 7m
04 Aug 1984 @ 13161h 18m 9d 18h 43m
25 Jul 1984 @ 18333h 6m
25 Jul 1984 @ 15271h 19m 5d 17h 11m
19 Jul 1984 @ 22161h 23m 2h 57m
19 Jul 1984 @ 19191h 21m 3h 10m
19 Jul 1984 @ 16091h 25m 3h 2m
19 Jul 1984 @ 13071h 22m 22h 10m
18 Jul 1984 @ 14571h 22m 23h 58m
17 Jul 1984 @ 14593h 11m
17 Jul 1984 @ 11481h 21m 2h 53m
17 Jul 1984 @ 08551h 22m 5d 20h 8m
11 Jul 1984 @ 12471h 22m 3h 23m
11 Jul 1984 @ 09241h 21m 2h 14m
11 Jul 1984 @ 0710 ie>35m 302d 20h 10m
12 Sep 1983 @ 110053d 18h 3m
20 Jul 1983 @ 1657 ie9d 5h 17m
11 Jul 1983 @ 1140 ie51d 16h 19m
20 May 1983 @ 1921 ie258d 22h 1m
03 Sep 1982 @ 2120 ie55d 3h 40m
10 Jul 1982 @ 17402h 19m
10 Jul 1982 @ 1521 ie9d 22h 21m
30 Jun 1982 @ 17001y 2d 6h 4m
28 Jun 1981 @ 1056 ie283d 23h 27m
17 Sep 1980 @ 1129 ie17h 14m
16 Sep 1980 @ 1815 ie14d 23h 27m
01 Sep 1980 @ 1848 ie37d 58m
26 Jul 1980 @ 1750 ie309d 1h 12m
21 Sep 1979 @ 16385h 53m
21 Sep 1979 @ 1045 ie16m 38s 9d 1h 0m
12 Sep 1979 @ 0945 ie4d 48m
08 Sep 1979 @ 0857 ie7d 23h 27m
31 Aug 1979 @ 0930 ie17h 15m
30 Aug 1979 @ 1615 ie13d 31m
17 Aug 1979 @ 1544 ie6h 12m
17 Aug 1979 @ 0932 ie4d 18h 41m
12 Aug 1979 @ 1451 ie9d 5h 51m
03 Aug 1979 @ 0900 ie13d 23h 57m
20 Jul 1979 @ 0903 ie18d 8m
02 Jul 1979 @ 0855 ie20d 22h 45m
11 Jun 1979 @ 1010 ie5d 19h 50m
05 Jun 1979 @ 1420 ie1d 3h 13m
04 Jun 1979 @ 1107 ie261d 20h 48m
15 Sep 1978 @ 1419 ie13d 5h 45m
02 Sep 1978 @ 0834 ie1d 22h 59m
31 Aug 1978 @ 0935 ie4d 0m
27 Aug 1978 @ 0935 ie76d 22h 55m
11 Jun 1978 @ 1040294d 50m
21 Aug 1977 @ 09505d 35m
16 Aug 1977 @ 091518d 25m
29 Jul 1977 @ 0850 ie37d 15m
22 Jun 1977 @ 0835 ie149d 20h 5m
23 Jan 1977 @ 1130 ie121d 22h 0m
23 Sep 1976 @ 1430 ie1d 30m
22 Sep 1976 @ 1400 ie1d 4h 50m
21 Sep 1976 @ 0910 ie3d 18h 22m
17 Sep 1976 @ 14483d 5h 33m
14 Sep 1976 @ 09159d 15m
05 Sep 1976 @ 0900 ie1d 0m
04 Sep 1976 @ 0900 ie16d 18h 35m
18 Aug 1976 @ 1425 ie11d 5h 20m
07 Aug 1976 @ 0905 ie10d 16h 35m
27 Jul 1976 @ 163019d 7h 15m
08 Jul 1976 @ 0915 ie5d 30m
03 Jul 1976 @ 0845 ie13d 21h 15m
19 Jun 1976 @ 1130 ie5d 20h 30m
13 Jun 1976 @ 1500 ie7d 5h 55m
06 Jun 1976 @ 0905 ie4d 50m
02 Jun 1976 @ 08156d 23h 13m
26 May 1976 @ 0902 ie269d 16h 47m
30 Aug 1975 @ 1615 ie6d 2h 45m
24 Aug 1975 @ 1330 ie3d 4h 23m
21 Aug 1975 @ 0907 ie9d 18h 50m
11 Aug 1975 @ 141723h 47m
10 Aug 1975 @ 1430 ie5h 30m
10 Aug 1975 @ 0900 ie2d 16h 30m
07 Aug 1975 @ 1630 ie8d 4h 40m
30 Jul 1975 @ 1150 ie8d 19h 20m
21 Jul 1975 @ 1630 ie22h 0m
20 Jul 1975 @ 1830 ie5d 9h 35m
15 Jul 1975 @ 08556d 17h 10m
08 Jul 1975 @ 1545 ie2d 5h 50m
06 Jul 1975 @ 0955 ie7d 45m
29 Jun 1975 @ 09106d 18h 27m
22 Jun 1975 @ 1443301d 5h 5m
25 Aug 1974 @ 0938 ie7d 18h 0m
17 Aug 1974 @ 1538 ie1d 6h 26m

Interval Statistics

Interval Count100
Min2h 14m
Max13y 316d 2h 30m
Mean105d 14h 39m
Median6d 17h 48m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
29317 31 Oct 2023 @ 1615 --- MAB 2 inches below the rim - ping pong sized center bloops but not steady - no flow out the back - the little terraces are dry and snow in the silica bog is undisturbed
29024 22 Oct 2023 @ 0918 --- SantaFe108 In overflow, milky blue water with boiling. Not thumping as I walked by.
28977 21 Oct 2023 @ 1538 --- JR Still cloudy blue, but some decent bubbles in the center.
28917 20 Oct 2023 @ 1546 --- MAB just below the sinter shelf - backside channels and terraces damp but drying out - blue pool w pretty good center blips
28882 19 Oct 2023 @ 1212 --- DanS Full, blue with bubbling and thumps.
28795 14 Oct 2023 @ 1620 --- MAB full blue pool with tiny center blips - light runoff out back side
28769 14 Oct 2023 @ 1330 --- SantaFe108 Thumping! Colloidal blue and overflowing.
28636 05 Oct 2023 @ 1227 --- cb Turquoise blue pool with tiny bubbles breaking the surface. overflowing out both sides. i can still hear the thumping sounds.
28575 30 Sep 2023 @ 0804 --- ypcaribou Full, milky blue, thumping to the beat of an A-Fib heart.
28447 24 Sep 2023 @ 1125 --- DanS Full and blue. Light audible thumping.
28012 04 Sep 2023 @ 1647 --- cb turquoise blue, low & just barely in overflow. Tiny bubbles breaking the surface. still can hear the popping sounds
27598 14 Aug 2023 @ 1617 --- cb steaming, turquoiseolky nlue in color, tiny bubbles over center vent and thumping can still be heard
27288 28 Jul 2023 @ 2018 --- SantaFe108 Overflowing with milky blue water and thumping.
26970 09 Jul 2023 @ 1559 --- cb pool milky turquoise blue with a tiny bit of convection over the vent. Popping noises are still audible. Overflowing to the west.
26950 08 Jul 2023 @ 1953 --- nails Light milky blue with tiny bubbling point. There is an intermittent thumping noise.
26832 04 Jul 2023 @ 0923 --- MAB excellent overflow out south wrapping around to the silica bog - pearly blue in color not many bubbles visible - did not hear pops or thumps
26406 17 Jun 2023 @ 1509 --- SantaFe108 Full with milky blue water.
25865 28 May 2023 @ 2004 --- SantaFe108 Full and overflowing with milky blue water. Audible thumping from boardwalk with only occasional bubbling.
25657 21 May 2023 @ 1416 --- SantaFe108 Full and in overflow, with milky blue water.
25468 15 May 2023 @ 1934 --- ypcaribou Full with milky light blue liquid. In overflow
24580 30 Oct 2022 @ 1733 --- ypcaribou Full, milky blue. Still thumping.
24409 15 Oct 2022 @ 0935 --- MAB full light blue and overflowing out E and W channels - tiny center bubbles
24255 05 Oct 2022 @ 1301 --- cb pool is high, opalescent turquoise blue color with a few small bubbles breaking the surface. overflowing in both directions. Still can here the popping sounds.
23966 20 Sep 2022 @ 1719 --- ypcaribou Full, milky, irredescent blue. Overflow coating the west knoll but not visibly flowing. Thumps still heard.
23638 07 Sep 2022 @ 1136 --- MAB pearly blue full w teeny tiny center boil - overflow wraps around to silica bog and joins 2nd Erupter channel which is bone dry above that point
23504 31 Aug 2022 @ 1139 --- cb Overflowing on both sides, milky turquoise blue with small bubble breaking the surface in the center. The audible popping sound is still here and seems louder to me!
23324 21 Aug 2022 @ 1033 --- ypcaribou Amazing, colloidal, bright blue. Full to rim. Thumping audible!
23258 18 Aug 2022 @ 0928 --- MAB pale blue overflowing both directions - popping thumps audible from bw north snd west sides
23091 07 Aug 2022 @ 0830 --- dandersen The popping noises Carol wrote about earlier this year are still happening.
23080 06 Aug 2022 @ 1146 --- cb no change
22987 02 Aug 2022 @ 1056 --- cb Pool is still opalescent turquoise blue in color with a very small bubble in the middle. pool is overflowing on both sides. I still hear the popping sounds.
22951 31 Jul 2022 @ 1130 --- cb pool is high, good overflow on both sides, opalescent turquoise blue in color with small consistent string of bubbles breaking the surface. i can still hear the weird popping sound near or around PC.
22898 27 Jul 2022 @ 1551 --- MAB in overflow
22742 20 Jul 2022 @ 1907 --- nails Light blue with a slight bubbling or convection. Second Erupter is dry.
22704 19 Jul 2022 @ 1219 --- cb Turquoise blue, overflowing X 2 & I can hear distinct thumping sounds that are either coming from PC or 2nd Eruptor. 99% convinced the sounds are coming from PC! Second Erupter has no water or steam. Thumping does not correlate with any pool movement. PC pool is steaming on this warm afternoon!
22496 11 Jul 2022 @ 1652 --- cb overflowing on both sides again. pool is blue green in color with a occational bubble
22322 04 Jul 2022 @ 1458 --- cb pool low, below the sinter rim by a hair. no overflow, 2" blooping boil in the center. volor is blue.
22376 01 Jul 2022 @ 1840 --- MAB Flowing out the backside splitting east and west
22212 29 Jun 2022 @ 1416 --- cb Vibrant opalescent turquoise blue color. Occational bubble breaking the surface. overflowing in both directions.
22120 25 Jun 2022 @ 1158 --- cb no change
22095 23 Jun 2022 @ 1748 --- cb opalescent turquoise blue color, pool is just at the rim & slight overflow on both sides. no bubbles
21611 31 May 2022 @ 1526 --- cb in overflow on both sides. Turquoise in color. 1 small bubble centerish.
21332 16 May 2022 @ 1128 --- Tara Full and overflowing, water is turquoise color.
21238 11 May 2022 @ 1620 --- MAB full - a pretty light blue color w tiny center dots not enough to even call a tiny boil
21092 26 Apr 2022 @ 1630 --- MAB full - light blue
21072 24 Apr 2022 @ 1557 --- DanS Full and blue
21017 18 Apr 2022 @ 1649 --- MAB light blue - appeared to be an inch below the shelf but waters were flowing out the S - lots of wetness from last Tuesday storm who knows
20303 04 Nov 2021 @ 1151 --- MAB light blue - full and flowing out the back - the silica bog wraps around towards Second Erupter and makes a nice blue boggy scene but doesn't connect to 2nd Erupter channel
20109 24 Oct 2021 @ 1241 --- MAB full and overflowing - didn't walk much farther south but the waters in the silica bog from overflow have joined the Second Erupter channel and a little flows under the BW - Could just be extra H2O from snow - a later visit looked like it was maybe 1in down as seen from west - too hard to tell from north view
20087 22 Oct 2021 @ 1350 --- MAB blue with overflow out the backside then E to S Fork Tantalus and W to silica bog - bog wraps around to the N towards Second Erupter but isn't as full there
20049 19 Oct 2021 @ 1326 --- cb pool is high & overflowing on in both channels. color is turquoise blue with a wee bubble barely breaking the surface of the pool.
20024 17 Oct 2021 @ 1218 --- MAB full - pretty blue color w light center boil- still overflowing out the back w waters flowing E and W
19901 05 Oct 2021 @ 1119 --- MAB pearly blue color - light center boil - overflowing out the back to both east to So. Tantalus and the bog to the west
19812 30 Sep 2021 @ 1306 --- cb pool very high, at or above the scalloped edges, and in overflow on both sides. pool is a milky, opalescent turquoise blue color & steamy.
19609 16 Sep 2021 @ 1054 --- cb pool is high & in overflow on both sides. color is greenish with occational tiny bubbles breaking the surface.
19622 16 Sep 2021 @ 0909 --- MAB full - slight overflow out back side pooling to west
19374 08 Sep 2021 @ 1154 --- Tara calm with light bubbles, down .5" from rim
18783 01 Aug 2021 @ 1038 --- cb About an inch below the scalloped edges, blue un color with weird soapy looking foam floating in patches all over the top of the pool.
18747 30 Jul 2021 @ 0750 --- ypcaribou Quite full & milky blue
18670 25 Jul 2021 @ 1740 --- cb Pool is down 2" below the rim. not in overflow, green in color and slight bubble breaking the surface!
18509 18 Jul 2021 @ 1108 --- cb 2" of exposed sinter rim. not in overflow. 1" bubbles breaking the surface in the middle of the pool. color is sea foam green.
18368 11 Jul 2021 @ 1508 --- cb pool is turquoise blue, water level is high and it has a 2" bubble in the center. Overflowing on both sides.
18330 09 Jul 2021 @ 1308 --- MAB full blue and overflowing out the back end to the little terracettes - very light boil
18279 05 Jul 2021 @ 1516 --- cb Overflowing to the west. Opalescent blue in color with miniscule convection waves occationally coming from the center.
18259 03 Jul 2021 @ 1747 --- MAB full - more blue than green with a teeny tiny center boil
18182 29 Jun 2021 @ 1342 --- cb pool is up to the sinter rim, blue in color with a small bubble in the center. Overflowing to the west and a bit to the east > toward Echinus.
18154 28 Jun 2021 @ 1659 --- MAB Full with light center boil - more blue than green
17925 19 Jun 2021 @ 1707 --- MAB full to sinter shelf- green - minimal boil seen but windy
17796 14 Jun 2021 @ 1729 --- MAB water level higher than 6/12 at 4in below sinter rim - green color w a center boil
17728 12 Jun 2021 @ 1558 --- MAB water down ~8-10in below sinter shelf
17572 08 Jun 2021 @ 1130 --- cb Pool is down 3" - 4" below the rim of the pool. color is green with a 2-3" boil in the center. no overflow.
17457 04 Jun 2021 @ 1508 --- MAB water level 4" below sinter shelf- green
17351 01 Jun 2021 @ 0915 --- MAB green in color - down 2in from rim - light boil
17274 30 May 2021 @ 1624 --- cb pool is ~2" below overflow and has a good 2" blooping boil in the center.
17094 13 May 2021 @ 1436 --- JarnoO Thermistor changed between 1434 and 1436 MDT (logger is in MST). Per Mike Poland (YVO) in chat on 2021-05-14 2207 & 2209: "Just wanted to let everyone know that I put a new thermistor at Pork chop [sic]. The park geologists were saying that they were measuring temperatures of about 40 degrees [C]. When I changed the thermistor, the logger showed the same. I can't explain why that happened, but I suspect the Pork chop [sic] temperatures have been incorrect for at least a few months.

I'll try to test the equipment in the next few days. Just wanted to let everyone know that the sudden change in Porkchop temperature is an equipment change, and the current temperature appears to be accurate."

For context: before the thermistor was changed, it logged above 70°C.
17044 11 May 2021 @ 1143 --- cb Porkchop is barely in overflow to the west. nothing on the east side. color is hard to see but I'd say blue green with a small boil in the center.
17026 09 May 2021 @ 1250 --- cb color is a deep green, not overflowing with a small roiling boil in the center.
17002 06 May 2021 @ 1301 --- MAB Full - center boil - green
16894 20 Apr 2021 @ 1543 --- MAB Full, greenish water
16397 10 Oct 2020 @ 1040 --- cb Water level is high and is overflowing on both sides. Pool is a milky turquoise blue color with small occational bubble breaking the surface in the center. interesting is that the pool is "rocking" or small pulses that are sending small convection waves out toward the edge of the pool.
16344 06 Oct 2020 @ 1257 --- cb Pool very high and overflowing in both directions. Color is turquoise blue with 1 small area of convection left of center a tad.
16268 26 Sep 2020 @ 1609 --- cb pool is high with ping pong ball sized bubbles breaking the surface. overflowing on both sides.
15698 23 Aug 2020 @ 0755 --- ypcaribou Full, clearish milky blue
15551 13 Aug 2020 @ 1102 --- cb pool is calm, overflowing on both sides and a interesting color of milky blue
14948 10 Jul 2020 @ 1450 --- cb pool is high, blue in color & overflowing with a few bubbles popping the surface
14505 01 Jun 2020 @ 1821 --- ypcaribou Full to brim, colloidal milky blue
14004 03 Nov 2019 @ 1120 --- MAB opalescent blue color overflowing south and east sides. runoff cuts thru snow exposing the neat little terracing
13930 12 Oct 2019 @ 1255 --- cb Pool is turquoise blueish. water level is high and in overflow in both directions with occational blips ti 1".
13574 05 Sep 2019 @ 0945 --- cb pool is high, overflowing on both sides, 1" bubbles breaking the surface and is lighter green in color.
13490 01 Sep 2019 @ 0901 --- cb pool high. in overflow on both sides. no bubbles
13388 25 Aug 2019 @ 0702 --- ypcaribou Nicely full and blue
13250 14 Aug 2019 @ 1556 --- cb pool is high, blue, in weak overflow with bubbles breaking the surface in the center.
13162 11 Aug 2019 @ 0844 --- RMichaels Overflowing with occasional bubbles.
13128 09 Aug 2019 @ 0904 --- cb pool is high, turquoise blue in color with 2" diameter bubbles breaking the surface in the center. light overflow.
12999 03 Aug 2019 @ 0858 --- cb pool is down a inch from the rim. milky turquoise blue in color with a small 2" bubbler in the middle.
12973 02 Aug 2019 @ 1400 --- MAB down 1 inch from sinter rim- green yellow color - bloops in center
12925 01 Aug 2019 @ 1119 01 Aug 2019 @ 1124 cb pool has a small boil in the center, 1 - 2" in height, and the pool is down 1/2" from the rim. Both overflow channels only extend 3 feet from the crater. channels are mostly dry.
12892 31 Jul 2019 @ 0926 --- cb color is a opalescent turquoise blue, pool is just below the rim and steamy. Second eruptor is pushing out water in waves and its basin is high, not quite overflowing.
12844 28 Jul 2019 @ 0700 --- ypcaribou Very full and overflowing into runoff channel to S. Fullest this observer has seen it since Spring 2018.
12543 20 Jul 2019 @ 1257 --- cb pool is high; up to the rim. beautiful blue color. a few bubbles that break the surface in the middle.
No attachments for this geyser.
Baseline does not exist.