Last Known Eruption
5d 13h 7m ago

Latest Eruptions

Eruption DurationInterval
15 Jun 2018 @ 1655 maj37m 4d 15h 49m
11 Jun 2018 @ 0106 maj6d 16h 2m
04 Jun 2018 @ 0904 maj30m 7d 13h 49m
27 May 2018 @ 1915 maj19m 7d 21h 27m
19 May 2018 @ 2148 maj6d 17h 57m
13 May 2018 @ 0351 E maj8d 4h 36m
04 May 2018 @ 2315 E maj7d 16h 45m
27 Apr 2018 @ 0630 E maj7d 14h 4m
19 Apr 2018 @ 1626 E maj35d 11h 5m
15 Mar 2018 @ 0521 E maj3y 193d 6h 38m
03 Sep 2014 @ 2243 E maj23m 1y 34d 3h 13m
31 Jul 2013 @ 1930 E maj6y 162d 2h 30m
21 Feb 2007 @ 16001y 274d 2h 19m
23 May 2005 @ 1441 maj1y 213d 18h 15m
22 Oct 2003 @ 2026 maj178d 16h 32m
27 Apr 2003 @ 0354 E maj32d 2h 22m
26 Mar 2003 @ 0032 E maj193d 3h 12m
13 Sep 2002 @ 2220 maj140d 20m
26 Apr 2002 @ 2200 ie maj1y 359d 16h 0m
02 May 2000 @ 0600 ie maj8y 214d 14h 11m
02 Oct 1991 @ 1549 maj1y 120d 7h 41m
04 Jun 1990 @ 0808237d 12h 31m
09 Oct 1989 @ 1937 A157d 8h 33m
05 May 1989 @ 1104 maj12m 109d 20h 19m
15 Jan 1989 @ 1345 A maj4y 112d 10m
26 Sep 1984 @ 1435 maj20m 82d 5h 34m
06 Jul 1984 @ 0901 maj8m 23d 9h 11m
12 Jun 1984 @ 2350 maj~19m 19d 19h 5m
24 May 1984 @ 0445 A69d 5h 45m
15 Mar 1984 @ 2200 A93d 13h 0m
13 Dec 1983 @ 0900 A106d 20h 2m
28 Aug 1983 @ 135865d 18h 33m
23 Jun 1983 @ 192516m 47d 19h 25m
07 May 1983 @ 0000 A20d 6h 3m
16 Apr 1983 @ 165714d 16h 57m
02 Apr 1983 @ 0000 A9d 9h 20m
23 Mar 1983 @ 144010d 14h 40m
13 Mar 1983 @ 0000 A12d 0m
01 Mar 1983 @ 0000 A24d 13h 5m
04 Feb 1983 @ 105515d 16h 55m
19 Jan 1983 @ 1800 ie18d 18h 0m
01 Jan 1983 @ 0000 A24d 4h 0m
07 Dec 1982 @ 2000 A24d 10h 0m
13 Nov 1982 @ 1000 A15d 11h 0m
29 Oct 1982 @ 0000 A19d 4h 0m
09 Oct 1982 @ 2000 A19d 9h 23m
20 Sep 1982 @ 103715m 13d 23h 1m
06 Sep 1982 @ 113633d 2h 33m
04 Aug 1982 @ 0903 maj43d 6h 51m
22 Jun 1982 @ 021213d 18h 22m
08 Jun 1982 @ 07506d 20h 36m
01 Jun 1982 @ 111411d 23h 20m
20 May 1982 @ 1154 maj10d 18h 54m
09 May 1982 @ 17004d 19h 43m
04 May 1982 @ 21176d 9h 17m
28 Apr 1982 @ 1200 A4d 6h 43m
24 Apr 1982 @ 04178d 4h 17m
16 Apr 1982 @ 0000 A26d 0m
21 Mar 1982 @ 0000 A10d 15h 0m
10 Mar 1982 @ 0900 A7d 9h 0m
03 Mar 1982 @ 0000 A9d 5h 0m
21 Feb 1982 @ 1900 A10d 19h 0m
11 Feb 1982 @ 0000 A1982 log28d 7h 0m
13 Jan 1982 @ 1700 A
13 Jan 1982 @ 1700 A2y 210d 2h 34m
18 Jun 1979 @ 1526299d 7h 23m
23 Aug 1978 @ 0803 maj147d 20h 33m
28 Mar 1978 @ 10309y 216d 9h 20m
26 Aug 1968 @ 021083d 19h 5m
03 Jun 1968 @ 070541d 17h 27m
22 Apr 1968 @ 1238311d 6h 58m
16 Jun 1967 @ 064028d 6h 40m
19 May 1967 @ 0000 A11d 0m
08 May 1967 @ 0000 A11d 23h 0m
26 Apr 1967 @ 0000 A37d 0m
20 Mar 1967 @ 0000 ?144d 2h 10m
26 Oct 1966 @ 225077d 3h 14m
10 Aug 1966 @ 193652d 8h 54m
19 Jun 1966 @ 104289d 9h 42m
22 Mar 1966 @ 000017d 6h 0m
04 Mar 1966 @ 1800 A27d 2h 39m
05 Feb 1966 @ 152177d 15h 21m
20 Nov 1965 @ 000069d 3h 11m
11 Sep 1965 @ 2149 ns13d 21h 34m
29 Aug 1965 @ 001549d 2h 45m
10 Jul 1965 @ 213027d 1h 50m
13 Jun 1965 @ 19409d 10h 12m
04 Jun 1965 @ 09288d 22h 13m
26 May 1965 @ 11157d 15h 50m
18 May 1965 @ 192510d 22h 25m
07 May 1965 @ 2100 A9d 1h 0m
28 Apr 1965 @ 2000 A14d 3h 0m
14 Apr 1965 @ 160010d 16h 0m
04 Apr 1965 @ 0000 A8d 0m
27 Mar 1965 @ 0000 A14d 0m
13 Mar 1965 @ 0000 A12d 16h 0m
28 Feb 1965 @ 0800 A10d 0m
18 Feb 1965 @ 0800 A16d 8h 0m
02 Feb 1965 @ 0000 A18d 20h 0m
14 Jan 1965 @ 0400 A20d 4h 0m

Interval Statistics

Interval Count99
Min4d 6h 43m
Max9y 216d 9h 20m
Mean197d 6h 42m
Median20d 6h 3m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
8824 20 Jun 2018 @ 1915 20 Jun 2018 @ 2015 udo Nearly all are thin individual minors. One concerted white water vertical was seen. NV max 20 feet. SV max 5 feet. Nothing to get excited about yet. It is making progress however. Mosquitoes are ravenous.
8823 20 Jun 2018 @ 1817 20 Jun 2018 @ 1945 mdschwarz Per Carol: Minors markedly increased in height and strength starting at 1817, South Vent still weak but starting to put water down runoff channel (but not a lot). Occasional vertical play from North Vent. "Puff ball" surge from North at 1936
8822 20 Jun 2018 @ 1505 20 Jun 2018 @ 1530 LynnS Weak, periodic angled jetting 4 to 6 feet high from north vent; no eruptive activity from south vent; no runoff from the jetting
8808 20 Jun 2018 @ 1100 --- Polly In looking at the graphs, Steamboat seems to be recovering slowly. We have had a lot of rain the last couple of days, but not sure how much affect that has had on the graph. Possible disturbance??? Also, there are other signs in the basin, as noted by other Gazers’ on-site observations, that seem to show possible disturbance.
8811 20 Jun 2018 @ 0910 20 Jun 2018 @ 1016 cb Steamboat is gently steaming from both vents. With occasional spritz out of NV. Much less activity from SV. Nothing vertical. South run off channel is wet down past the bridge approximately 20 yards. Cistern Spring is a bit lower than yesterday. Still in overflow just decreased amount. Vigorous boil.
8812 20 Jun 2018 @ 0800 20 Jun 2018 @ 0915 mdschwarz Frequent wispy angled splashes from North Vent, mostly 5-10 feet. Three barely-above-the-surface splashes from South Vent over 75 minutes.
8794 19 Jun 2018 @ 1720 19 Jun 2018 @ 1916 cb Still steaming with occasional angled splashing out NV to 4 ft. 1 small splash out of SV. I did see 2 faint splashes (aprox. 5 ft) that were angled toward the east from NV. Platform is fairly quiet with a faint rumble. Cistern still in overflow with a 2.5' diameter boil. Emerald Spring has a few more areas that are bubbling. Echinus water is high with more overflow and slightly increased boil. All the features from Echinus to Pearl have increased boiling.
8776 19 Jun 2018 @ 0656 --- cb water has returned to Steamboat. occasional 4' jets from NV. SV just steam. Cistern Spring is in overflow with a 2' diameter boil in the center. Emerald Spring is still clear and green in color but continues to have a 4 vent boil in the southeast thumb of the pool + a small boil to the right. Steamvalve Spring water is high and fairly clear.
8772 18 Jun 2018 @ 1925 18 Jun 2018 @ 1935 Tara Huffing steam from both vents. Saw 2 weak splashes from North Vent in 10 minutes, no water from South.
8767 18 Jun 2018 @ 1815 18 Jun 2018 @ 1825 udo Steaming with periodic huffing. No water.
8766 18 Jun 2018 @ 1715 --- cb no water yet.
8755 18 Jun 2018 @ 0930 --- bbev Steamy, occasional huffing from both vents. No water seen from either vent.
8753 17 Jun 2018 @ 1835 17 Jun 2018 @ 1851 bbev Steamboat quietly steaming. Cistern Spring is boiling vigorously, murky and refilling, 3' below rim of inner "tube".
8744 17 Jun 2018 @ 0940 17 Jun 2018 @ 1009 cb Very quiet. gently steaming. No water. Emerald Spring has 3 areas that have a boil in the Eastern thumb ( closest to the boardwalk) and is still clear and green. Cistern Spring has almost drained. still a bit of water in the bottom of the pool.
8726 16 Jun 2018 @ 1312 16 Jun 2018 @ 1419 bbev Strong, concerted water from both vents, NV jetting 40-60', more angled than this morning, but with some dirty, vertical splashing 10-15' in the "saddle". SV continuous, dirty, 10-20'. jetting vertically and to the north. Light to moderate runoff from SV, slight trickle from NV. Cistern 16-18' (intersection of the two logs) below overflow. Water cleaned up some, but energy remained constant during entire hour we were there
8711 16 Jun 2018 @ 0735 --- cb Steamboat is much quieter than last night but still has a roar! Mix of steam water. NV is jetting (vertically) water 25 - 35ft. SV has a light spray 10 - 20ft. Considerable runoff in the North runoff channel and South run off channel has a light but steady run off. Cistern Spring is down 12 - 14 inches with just A VERY small boil in the middle. Pool is fairly clear and Blue green in color.
8708 15 Jun 2018 @ 2055 15 Jun 2018 @ 2130 cb Steamboat is in loud roaring steam phase. Cistern Spring is down 6 - 8 inches from the rim.
8710 15 Jun 2018 @ 2000 15 Jun 2018 @ 2030 Tara Steamboat in roaring steam phase, no jetting water seen during this time.
8770 15 Jun 2018 @ 1855 15 Jun 2018 @ 2028 Ben VL Had been driving all day and saw the steam plume from the road. Arrived at the lower platform at 1855 with Steamboat in steam phase with small sprays of water mixed in from south vent, and a little from north as well. Steam phase was roaring, but not all that loud. 100% steam when I left at 2028. Cistern was down maybe an inch from the rim, and had dropped ever so slightly by the time I left with a very slight one vent boil.
8757 15 Jun 2018 @ 1800 --- Polly The YVO temperature graphs for individual geysers seem to show that the Norris Basin “weekly” cycle has shortened from a seven day cycle to six days. Also, it appears that Steamboat had become out of sync with the Norris cycle. (For the eruption on June 4, for example, Steamboat made several attempts over the period of a couple of days to erupt.). It seemed logical to assume that Steamboat would either have a short interval or an extra long one to get back in sync.
8698 15 Jun 2018 @ 1638 15 Jun 2018 @ 1647 udo Series of many good sized 30 foot+ concerted minors produced large streams of runoff.
8690 15 Jun 2018 @ 0735 15 Jun 2018 @ 0755 bbev N vent 25-30' at times (well over trees from mid deck) less vertical play this morning than last night. SV 5-15', with steady, light runoff. 0744 strong sustained, (10-15 sec) minor, vertical 35-40 feet from NV 25' vert from SV with heavy overflow down runoff. Deep rumble with percussive NV starts.
8684 14 Jun 2018 @ 2100 --- Polly The “weekly” cycle at Norris has shortened to 6 days. This can be seen in Porkchop’s YVO graph. Also, on-site reports show some facets that Steamboat may be adjusting to this shorter cycle. (Today’s Steamboat graph update was not available at this time.)
8683 14 Jun 2018 @ 1900 14 Jun 2018 @ 2000 cb concerted minors. NV 15 - 25 ft with some vertical splashing 10ft. SV 10 - 15 ft. @ 1856 light South run off channel water has reached the bridge.
8680 14 Jun 2018 @ 1450 14 Jun 2018 @ 1510 cb Some concerted play with SV & NV. South runoff channel is damp but water has not reached the bridge.
8674 14 Jun 2018 @ 0825 14 Jun 2018 @ 0905 bbev South vent 8 -10 ft. North vent less frequently at 10 -15 feet. @ 0847 & 0854 had a concerted minor, NV @20+ feet and SV was 10 - 15 ft. No water in either runoff channels. Cistern in overflow.
8652 13 Jun 2018 @ 0808 13 Jun 2018 @ 0859 WillBoekel Whispy jets of water 4 - 6ft out of North vent with impressive (it's cold this morning) billows of steam. No water South vent. Audible gurgling and rumbling. Cistern Spring looks like it recently reached overflow as the runoff pools are full and steamy but no water in the runoff channels yet (0834).
8651 13 Jun 2018 @ 0809 13 Jun 2018 @ 0851 cb Whispy jets of water 4 - 6ft out of North vent with impressive (it's cold this morning) billows of steam. No water South vent. Audible gurgling and rumbling. Cistern Spring looks like it recently reached overflow as the runoff pools are full and steamy but no water in the runoff channels yet (0834).
8646 12 Jun 2018 @ 1901 12 Jun 2018 @ 1955 cb Steamboat is gently steaming still. No audible sounds and no water. Both run off channels are dry. Emerald Spring is in overflow again and is its beautiful green color. Cistern Spring is filling with a vigorous 2 vent boil 8 - 10" high. It is approximately 2 feet below the rim of the inner tube.
8643 12 Jun 2018 @ 0839 12 Jun 2018 @ 1034 cb Steamboat is gently steaming with no water. VERY little audible huffing sounds. A trickle of water in the North runoff channel. Emerald Spring water level has dropped and is barely putting water into the runoff channel. . Cistern Spring is EMPTY with very little steam.
8641 11 Jun 2018 @ 0908 11 Jun 2018 @ 1220 DanS Post major eruption water play continued with some bursts estimated at 70-80 feet. North vent water was brown and continued to throw pebbles fairly often. Frequency of larger burst play appeared to decrease as time passed.
8629 11 Jun 2018 @ 0425 11 Jun 2018 @ 0658 CrisG Arrived to wet parking lot and steam phase in progress. At 0540, noted increased volume to steam. At 0548, water reentered steam with North vent erupting well above treeline from upper platform. Water from North Vent initially white, turned brown at 0554. Little to no water in South Vent during reentry. Cistern was down slightly upon arrival. At 0616, water level was down several more inches. North vent visibly tossing rocks at 0612, could hear rocks falling around 0600.
8624 10 Jun 2018 @ 1845 10 Jun 2018 @ 2130 ypcaribou No major yet. Lots of regular concerted splashes half as tall to as tall as the trees. Not much vertical. E channel wet with a few good surges. W channel dry, not a trickle.
8623 10 Jun 2018 @ 2058 --- DanS Has not erupted yet. Cold and windy - bring warm clothes if coming tomorrow!
8617 10 Jun 2018 @ 1504 --- udo No eruption yet. Huge false start minor at 1114.
8615 10 Jun 2018 @ 1410 --- Tara No eruption yet.
8614 10 Jun 2018 @ 1100 10 Jun 2018 @ 1156 Tara Strong push, series of large minors leading to huge minor at 1114 that was stronger than "The 1408" on May 26. North sustained to 50+ feet and threw many rocks, left and right side of bottom rock covered. Cistern Spring dropped below overflow level on the east side of the pool. Everyone who had seen it before thought it was starting. Strong minors less frequent until 1156 when they entered a lull. Cistern had recovered by 1240.
8609 09 Jun 2018 @ 1952 09 Jun 2018 @ 2014 bbev Both alternate and concerted minors with 1-2 minute pauses. North 15-25' and South 5-15'. No real "pushes" of water from S down main runoff, but still a light, steady flow during the short time we were there.. N runoff dry. Appears to be progressing very much like previous post eruptive activity witnessed in the recent past. Mosquitos are relentless and vicious.
8583 09 Jun 2018 @ 0724 --- cb Nice concerted MINOR play from both vents. 15 - 20 ft splashes out of NV. 10 - 15 feet out of SV. Steady light flow of water down the Main runoff channel. North runoff channel is dry in front of the lower platform. Cistern Spring again is to steamy to see the pool but I can hear boiling.
8556 08 Jun 2018 @ 0730 08 Jun 2018 @ 0819 cb Steamboat > 8 - 15+ foot jets of water from North vent at 0731, 0733 0741 0749, 0802. 0741, 0749 0759 had concerted light water from both vents. Main runoff channel has light water that extends approximately 30 feet from SV. Runoff channel in front of the platform (North?) is dry dry dry! Cistern Spring has heavy steam that obscures a view. I can hear a boil and see convection waves on the edge of the pool.
8546 07 Jun 2018 @ 1918 07 Jun 2018 @ 1937 bbev 1918, Quietly steaming, very little sound, no water seen in geyser or runoff channels. Cistern boiling more vigorously than this morning with more overflow.1930 wispy jet of water out of north vent following mild rumblings. 1935 anther wispy jet following rumbling. Mosquitos are driving us out! 1937 more splashing, 4-6', from north.
8544 07 Jun 2018 @ 1220 --- bbev Still quiet and steaming, no water in geyser or runoff.
8523 07 Jun 2018 @ 1040 --- CrisG Steamboat contines to gently steam. No water observed from vents.
8510 07 Jun 2018 @ 0850 07 Jun 2018 @ 0912 bbev Steamy, no water seen from Steamboat or in either rurnoff channels. Some huffing, but mostly quiet. Cistern Spring is 2" below overflow, gently boiling.
8488 06 Jun 2018 @ 0942 --- CrisG Steaming from both vents. No water observed from vents.
8480 06 Jun 2018 @ 0803 06 Jun 2018 @ 0837 cb Steamboat is still quietly steaming. No audible huffing sounds. No water from either vent. There is a trickle of water in the runoff channel closest to the overlook which was not there last night. Cistern Spring has drained. No water visible at all just lightly steaming.
8471 05 Jun 2018 @ 1925 05 Jun 2018 @ 1945 cb Steamboat is gently steaming. No water. Occational rythemic huffing sound. All runoff channels are dry. I'm not seeing the post eruptive water phase that we have observed in the past 4 eruptions. Cistern Spring is down approximately 4 feet from overflow rim (to the end of the crossed logs) with no boiling activity at all.
8461 05 Jun 2018 @ 1130 05 Jun 2018 @ 1226 cb whispy jets of water mixed with billowing steam. slight huffing. Cistern down 2.5 - 3 feet.
8462 05 Jun 2018 @ 0755 05 Jun 2018 @ 0800 cb Strong steam from both vents. very frequent, almost continuous heavy jetting of water to 30 feet from NV. Much less water from the South vent.
8564 03 Jun 2018 @ 1957 03 Jun 2018 @ 2050 Siegmund 19:57 minor was largest of the day so far. 20:24 was larger still, and was followed by nearly continuous small minors, with additional large minors (smaller than 2024, but larger than most others all day) at 2030,2032, 2036. Lots of people believing it was going to start. After 2036 it calmed down. The 2050 minor was not tall but sent an unusually large flood down the channel.
8434 03 Jun 2018 @ 1730 --- Janet White No eruption yet
8433 03 Jun 2018 @ 1200 03 Jun 2018 @ 1415 Tara Strong push 1200-1250, many tall minors with heavy runoff from 1220-1250. Those who had seen it before had cameras ready. Appeared to go into a lull after that, no Steamboat as of 1415.
8431 03 Jun 2018 @ 0705 --- Graham Strong minor put water down the west side of the runoff channel. Last night North vent wasn't doing much but this morning it's more active. Not as much vertical splashing as last weekend. No Steamboat as of 0925.
8429 02 Jun 2018 @ 2336 --- Dave from B No eruption as of 2220
8424 02 Jun 2018 @ 2158 --- udo No Steamboat yet.
8421 02 Jun 2018 @ 2045 --- RMichaels No Steamboat yet. Some good runoff events seen from bridge. South dominated minor activity between observed times of 1700 and 2045. Some vertical play from North, but nothing significant. Overall, Steamboat looks more active now than it did at the same time in the prior interval.
8406 02 Jun 2018 @ 0730 02 Jun 2018 @ 0744 Polly This morning SV is putting out nice babbling brook. And NICE strong minors!
8404 02 Jun 2018 @ 0733 02 Jun 2018 @ 0734 Polly Graphs are up. Looks like short pause and fast recovery. Strong minors more pronounced than in last couple of cycles. (YVO graphs)
8397 01 Jun 2018 @ 1914 01 Jun 2018 @ 2034 cb water in Steamboat has increased since this morning's observation. North vent is having periods of jetting 10 - 20+ ft with South vent chiming in with heights of 8 - 10 ft. No water was observed in SV this morning. @1945, 1952, 2000 & 2013, I observed concerted events with NV height approx 20' and SV 10'. Cistern Spring is overflowing with vigorous 2 vent boil approx 4' in diameter. The main run off channel has nice run off FOR THIS POINT IN THE INTERVAL! Occasional debris in main channel from SV.
8386 01 Jun 2018 @ 0730 --- cb some sporadic splashing out of North Vent. No water in the Main runoff channel. Cistern Spring is overflowing with a 3 ft in diameter boil.
8370 31 May 2018 @ 1238 --- cb Steamboat is gently steaming. No water from either vent. Cistern is in overflow with a rolling boil in the center that twice sent up a 6 inch spike of water that made a audible "plop" back into the pool.
8348 30 May 2018 @ 0858 --- bbev Quietly steaming, no water seen from either vent. Cistern empty, steamy, no water seen from upper deck, but can hear water splashing in bottom of crater.
8343 29 May 2018 @ 1415 --- Stephen_Gemar Steamboat is in a constant, but very quiet steam phase with no water from either North Vent or South Vent.
8335 29 May 2018 @ 0728 --- cb In huffing steam phase (very rhythmic) with 8 - 10 foot jets of water/steam mix coming from North vent. Cistern is down approximately 3ft below overflow with a one vent slight boil.
8332 28 May 2018 @ 1900 28 May 2018 @ 2015 Stephen_Gemar Steamboat was jetting continuous water and steam when we were observing it. The jets were still fairly strong and forceful; North Vent was reaching 60-70 feet at times.
8328 28 May 2018 @ 1339 28 May 2018 @ 1432 Graham Water and steam in progress. switched to steam at 1345. Water picked up at 1350a but not as defined, more forced by the steam and it did get the creek flowing by the lower deck.
8325 28 May 2018 @ 1230 28 May 2018 @ 1330 RMichaels Both vents jetting continuous water and steam. North Vent jetting to about 70 ft. and throwing a significant number of rocks. Water from North is intermittently brown. South 20-30 ft. Cistern down 1.5-2 ft.
8324 28 May 2018 @ 1221 --- udo Gentle constant steaming. Small trickle of runoff in south channel. Wind driven mist is running off more heavily in north channel.
8327 28 May 2018 @ 0910 28 May 2018 @ 1005 Graham Mixed phase with North Vent jets to 60' and throwing small rocks out. At 1005 water stopped and it was all steam. Cistern starting to drop but down less than a foot.
8319 28 May 2018 @ 0625 --- udo Noisily steaming gently but constantly. Appears to be in the classic steam phase. Lower platform is getting drenched by falling mist.
8326 27 May 2018 @ 1900 27 May 2018 @ 2200 geysergazerwannabe What an amazing event! Check out our video and images of the start to steam! https://www.mindfultrails.org/2018/05/28/yellowstone-surprise-at-steamboat-geyser-may-27-2018/ Go Steamboat!
8314 27 May 2018 @ 1600 27 May 2018 @ 1700 Pat Snyder 1700 thunderstorms moved in. Had some additional good pushes. No eruption as of 1715.
8313 27 May 2018 @ 1400 --- Tara No eruption yet. Pushes at 1207 and 1322.
8311 27 May 2018 @ 1200 --- RMichaels No Steamboat as of 1200.
8310 26 May 2018 @ 2144 --- Scott Grisso Sustained minor eruption at 2144. Not as strong as the one at 1409, and play from the two vents did not converge.
8309 26 May 2018 @ 2100 --- udo No Steamboat yet.
8338 26 May 2018 @ 1400 26 May 2018 @ 2030 Tara These are the minors that put runoff over the "middle rock" which is on the right side of the main channel about halfway up the steep part of the hill. 1408--Very strong minors, none seen after were this strong until the eruption was imminent. 1522 1540 1617 1638 1642-1648 a series of four moderately strong minors (a few breaks in observations 1700-1800 but pretty sure I didn't miss anything significant) 1823 1839 1907 1910 1943 1957, 1958, 1959 (nice series) 2014 2017
8301 26 May 2018 @ 1900 --- Stephen_Gemar No Steamboat as of 19:15. Steamboat had some strong minors (good “pushes” to try and erupt) at 14:09, ~15:20, and 15:40.
8300 26 May 2018 @ 1820 --- Janet White No Steamboat yet, but had a couple of 40-60 ft minors.
8307 26 May 2018 @ 1540 --- udo Almost Yowza minor.
8306 26 May 2018 @ 1522 --- udo Yowza minor
8305 26 May 2018 @ 1409 --- udo Yowza minor.
8304 26 May 2018 @ 1103 --- udo Almost Yowza minor. About 15 seconds, less runoff.
8303 26 May 2018 @ 0955 --- udo Yowza minor! Yowza = concerted N S heavy vertical to 40 feet or more for over 20 seconds.
8297 25 May 2018 @ 2201 --- udo No eruption yet. Activity has progressed to good concerted random minors some with bubbling brook overflows. North to 50 feet with south to 25 or more - hard to see at times thru steam.
8296 25 May 2018 @ 2100 --- Tara No eruption yet.
8295 25 May 2018 @ 1915 --- billwarnock No Steamboat as of 1915
8291 25 May 2018 @ 0728 --- cb increased concerted play from both vents this morning as compared to last night's observation. Especially from South vent which is jetting 8 + ft at times. North vent jets 15 - 25 ft. Audibly louder Huffing! Cistern overflowing with rolling boil 3 - 4ft in diameter. Run off at bridge has 2 very small trickling channels.
8290 24 May 2018 @ 1915 24 May 2018 @ 1946 bbev Sporadic splashing from both vents, north 5-10', with only two "minors" at maybe 15-20'. South vent splashing less frequently, at 5+'. Both vents played together weakly once during the half hour I was there. More active than this morning, with increased noise and water.
8289 24 May 2018 @ 1500 24 May 2018 @ 1700 Tom C. Cistern boiling 2-4" high in a 3-4' diameter area. 2 trickles of runoff on either side of center area of bottom rock in E. channel. Water spritzing from both vents with gently huffing steam. One single spritz from each vent every minute or three. N. 2-15', S. 1-6'. Each spritz lasted for about 1/4 of a second. I would not characterize it as 'resumption of minor activity' yet, but I wouldn't fight anyone who did, either. From 1603-1606 N. spritzed 10 times from 4-15' and S. 6 times from 2-6' and I thought "here we go, minor activity start", but a lull ensued and I didn't note the vents playing more than once in a minute more than a couple times in the next 30+ minutes.
8287 24 May 2018 @ 0903 24 May 2018 @ 1000 udo North vent jets to 6-10 feet. South vent to 4-5 feet 30 seconds later. No discernable runoff yet. Minor activity is barely beginning. Smaller north vent jets 0907. More like splashing activity than minors. North vent to 15 feet solo 0913, 5 feet 0917. 6 to 8 small jets were seen in a 1-1/4 hours.
8286 24 May 2018 @ 0845 --- udo Gently steaming, no jetting from vents.
8285 24 May 2018 @ 0725 24 May 2018 @ 0745 cb From the upper platform, visually the vents are still huffing steam with occasional spritz of water from the North vent reaching 3 - 4 ft over the cone rim. Cistern is a beautiful turquoise blue color, overflowing, with a rolling boil in the middle.
8284 23 May 2018 @ 1630 --- cb Still in steam. No visible water. Cistern is in overflow with a rolling boil in the center.
8279 23 May 2018 @ 0749 23 May 2018 @ 0812 bbev Still quietly steaming from both vents. Cistern Springs is 2.5-3' below overflow, boiling gently in middle of pool, 2' diameter.
8273 22 May 2018 @ 1906 --- cb Steamboat is starting to make slight huffing sounds as it is steaming. No visible water yet. I can hear a little gurgle echoing deep down. Cistern is filling! Water level is approximately 3ft down from the deep inside crater. Easily visible from the boardwalk. The pool has a vigorous boil in the center and is a gray murky color.
8266 22 May 2018 @ 1215 22 May 2018 @ 1245 billwarnock Both vents gently steaming. No water seen or heard.
8262 22 May 2018 @ 1100 --- cb Gently steaming. seems even quieter than last night. Cistern Spring is empty. no water visible. SLIGHTLY steaming.
8254 21 May 2018 @ 1830 --- cb Steamboat is quietly steaming. No water observed. Quiet! Cistern is down 3 - 3.5 ft below overflow and bubbling gently in the center of the pool.
8256 20 May 2018 @ 1230 20 May 2018 @ 2000 imapayne we arrived around 12:30 to find it in water phase. for the next 4 hours it continued to change from mixed water/ steam to water. some jets from North vent were easily 2 to 2 1/2 times the height of the trees when viewed from the upper platform. around 16:30 it had some bursting that made the crowd watching scream and cheer then by 16:47 it turned to steam. after about an hour (I didn't get exact time) it turned back to changing from water to mixed until we left at 8:00. cistern was slowly dropping and was 18 to 24 inches down with light boiling when we left.
Baseline does not exist.


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