Last Known Eruption
58d 22h 32m ago

Latest Eruptions

Eruption DurationInterval
15 Oct 2024 @ 0209>4h 37m 5d 18h 21m
09 Oct 2024 @ 0748 ie4d 12h 34m
04 Oct 2024 @ 1914 ie1h 0m
04 Oct 2024 @ 1814 A9d 22h 25m
24 Sep 2024 @ 19491h 2m 7d 12h 22m
17 Sep 2024 @ 0727 ie>7d 21h 42m
09 Sep 2024 @ 094559d 18h 50m
11 Jul 2024 @ 145537m 9y 293d 23h 55m
23 Sep 2014 @ 1500 ie2h 58m
23 Sep 2014 @ 12025m
23 Sep 2014 @ 11571h 2m
23 Sep 2014 @ 1055 A1h 25m
23 Sep 2014 @ 0930 A12y 66d 20h 59m
21 Jul 2002 @ 1231 ie2y 322d 20h 47m
02 Sep 1999 @ 1544 ini5590d 4h 40m
04 Jun 1999 @ 1104 ini41258d 11h 4m
19 Sep 1998 @ 0000 A3d 8h 55m
15 Sep 1998 @ 1505 ie>40m 3d 23h 28m
11 Sep 1998 @ 15374d 3h 37m
07 Sep 1998 @ 1200 A2d 12h 0m
05 Sep 1998 @ 0000 A2d 12h 32m
02 Sep 1998 @ 1128 ie4d 17h 13m
28 Aug 1998 @ 1815 ie3d 14m
25 Aug 1998 @ 180115d 23h 31m
09 Aug 1998 @ 1830 A312d 4h 38m
01 Oct 1997 @ 1352 ie117d 52m
06 Jun 1997 @ 1300 A254d 13h 0m
25 Sep 1996 @ 0000 A4d 5h 0m
20 Sep 1996 @ 1900 A5d 19h 0m
15 Sep 1996 @ 0000 A16d 0m
30 Aug 1996 @ 0000 A8d 0m
22 Aug 1996 @ 0000 A14d 0m
08 Aug 1996 @ 0000 A320d 0m
23 Sep 1995 @ 0000 A23d 0m
31 Aug 1995 @ 0000 A4d 0m
27 Aug 1995 @ 0000 A4d 10h 0m
22 Aug 1995 @ 1400 A322d 2h 30m
04 Oct 1994 @ 1130 A8d 22h 51m
25 Sep 1994 @ 123924m 2d 22h 59m
22 Sep 1994 @ 13403d 22m
19 Sep 1994 @ 131851m 24d 5h 33m
26 Aug 1994 @ 0745 A26d 1h 45m
31 Jul 1994 @ 0600 A3d 21h 0m
27 Jul 1994 @ 0900 A10d 12h 42m
16 Jul 1994 @ 2018 ie>1m 17d 9h 21m
29 Jun 1994 @ 10573m
29 Jun 1994 @ 105473d 19h 14m
16 Apr 1994 @ 1540 A240d 21h 40m
18 Aug 1993 @ 1800 A11d 6h 30m
07 Aug 1993 @ 1130 A5d 21h 30m
01 Aug 1993 @ 1400 A8d 8h 0m
24 Jul 1993 @ 0600 A22d 18h 0m
01 Jul 1993 @ 1200 A28d 21h 30m
02 Jun 1993 @ 1430 A maj1d 14h 30m
01 Jun 1993 @ 0000 A19d 10h 30m
12 May 1993 @ 1330 A20d 23h 36m
21 Apr 1993 @ 1354 ie>8m 62d 12h 54m
18 Feb 1993 @ 0000 ? A5d 20h 0m
12 Feb 1993 @ 0400 A3d 16h 0m
08 Feb 1993 @ 1200 A

Interval Statistics

Interval Count59
Min3m
Max12y 66d 20h 59m
Mean196d 3h 4m
Median8d 8h 0m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
37671 22 Oct 2024 @ 1736 --- DanS Well below overflow, blue and calm
37615 17 Oct 2024 @ 1525 --- K.Cooper normal full level. Steady grand prismatic runoff.
37568 14 Oct 2024 @ 0530 14 Oct 2024 @ 0710 Dan A 0530 full and overflowing, 0710 2” down and dropping
37564 13 Oct 2024 @ 2357 --- Bhoffer ~ 4 inches below crater rim. no convection visible during brief observation
37554 13 Oct 2024 @ 1710 --- aferrara Very wet runoff channel, grand pris runoff into the pool, pale blue, steadily dropping. 6+ inches below overflow. Bubbling periodically around edge. 1730A: not dropping any more. 1740A: Resumed dropping. 1745A: Down close to a foot. Starting to suspect it's not going to erupt for us right now...
37553 13 Oct 2024 @ 1627 13 Oct 2024 @ 1651 Ben VL Just started to bubble 1627. Convection increased with waves across the pool. 1651 huge thumps and a large wave, then pool started dropping.
37552 13 Oct 2024 @ 1600 --- Ben VL In overflow, light convection, no bubbles.
37545 13 Oct 2024 @ 0930 --- Ben VL Pool starting to drop at approximately this time after having been up for a few hours. Steam made it a bit hard to see but there appeared to be light convection with no bubbles.
37538 13 Oct 2024 @ 0010 --- Bhoffer Opal higher than previous observation at 2000. Barely in overflow with light convection and no audible bubbling. No GPS flow 04:30 - Opal has dropped to ~1.5-2 inches below overflow and the catch basin to the right of the pool is no longer covered.
37430 07 Oct 2024 @ 1136 --- Tara turquoise blue, milky water, ~1 footbelow overflow
37237 29 Sep 2024 @ 0815 --- User34 Calm, overflowing, milky blue, and hot enough for me to check ot out when I saw the steam plume
37230 28 Sep 2024 @ 1915 --- Dan A Several inches below overflow, calm and blue in color.
37140 25 Sep 2024 @ 0720 --- TSBryan Pool down a foot or so, appeared (through heavy fog) to be completely calm.
37126 23 Sep 2024 @ 1042 --- Tara light blue, slightly milky, a few inches below overflow. calm with light convection over vent
37098 21 Sep 2024 @ 0705 --- Dan A Calm, blue and slightly below overflow
36466 06 Aug 2024 @ 0000 06 Aug 2024 @ 1600 Siegmund Comparison of photos posted online shows the pool full and overflowing on August 5th, and below the inner rim on the afternoon of August 6th. Water was slightly milky, but not brown or opaque, on the 6th.
35989 19 Jul 2024 @ 1238 --- Tara Full overflowing beautiful turquoise blue nearly clear water
35928 16 Jul 2024 @ 0620 16 Jul 2024 @ 0640 LynnS Pool and catch basin around it full; only a few black lumps on far east edge of basin area sticking up out of the water. Pool is blue. No discernible evidence of convection—surface of the pool is calm with no ripples
35869 12 Jul 2024 @ 0713 12 Jul 2024 @ 0814 LynnS Opal Pool has refilled, overflowing out the north side of the catch basin surrounding the pool. Water is a milky blue this morning. There was no convection over the vent during the observation period.
35860 12 Jul 2024 @ 0745 --- Ben VL Lynn may have more details later. Back in overflow & calm. Water is murky but less so than yesterday evening.
35850 11 Jul 2024 @ 2025 --- Tara watched for about 80 minutes, water rising slowly, still about 1.5' below overflow. one period of slight convection seen.
35855 11 Jul 2024 @ 1715 11 Jul 2024 @ 1745 LynnS Water down 2-3 feet when I arrived. Water milky gray-green color. Evidence of wash on east , west, and north of the crater. Small amount of foam at east end of the crater. No convection over the vent. No change in water level the half hour I watched it.
24943 23 Jan 2023 @ 1143 --- ypcaribou Multiple springs I have observed at Black Sand (Cinnamon) Midway (Opel) and Fountain (Celestine) are very low at the moment.
6290 12 Sep 2017 @ 0730 --- TSBryan possibly active. surrounding platform wet, including raised places, and numerous puddles all around.
2514 10 Oct 2015 @ 0836 --- Janet Jones Water at about half. A visitor said it was "way up" from yesterday.
1500 06 Jan 2015 @ 0800 06 Jan 2015 @ 1700 MAB Guides reported Opal dark and murky on Jan 6 - no further information yet
1494 26 Dec 2014 @ 1000 --- ACarlson A guide reported that Opal Pool is empty.
1426 27 Sep 2014 @ 1030 --- meide Opel pool was full and overflowing at 1030.  It was cold also, no steam on a cold and rainy day.
1421 25 Sep 2014 @ 0800 --- udo Opal continues to fill. Water level at 0800 was over a foot higher than yesterday at about 1700.
1417 24 Sep 2014 @ 1123 --- udo Water IS visible as of 1123 24 September 2014
1245 23 Sep 2014 @ 1642 --- udo Drained.
1065 06 May 2014 @ 1915 --- WillBoekel ~1915 drained
16729 28 Sep 1998 @ 1614 --- JarnoO marker in place
15883 17 Oct 1997 @ 1330 --- JarnoO marker in place
15881 11 Oct 1997 @ 1425 --- JarnoO marker in place
15310 21 Oct 1996 @ 1200 --- JarnoO {generic time}; marker in place
15284 09 Sep 1996 @ 1330 --- JarnoO 1' below overflow
14306 24 May 1995 @ 0000 24 May 1995 @ 2359 JarnoO down 1 to 2 feet
14263 07 Jan 1995 @ 0000 07 Jan 1995 @ 2359 JarnoO dormant
12309 01 Sep 1993 @ 1455 --- JarnoO still marked
12149 11 Feb 1993 @ 0830 --- JarnoO marks present
12145 09 Feb 1993 @ 1600 --- JarnoO mark present; Opal low and turbid and stinking; runoff channels cut through snow
12144 09 Feb 1993 @ 0900 --- JarnoO marked
7656 18 Jul 1979 @ 1800 --- research-mab 7-18-79 Opal Pool (?) having eruptions every 1-3 days.
No attachments for this geyser.
Baseline does not exist.