Last Known Eruption
6d 13h 43m ago

Latest Eruptions

Eruption DurationInterval
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 maj±3m35d 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
25 Dec 1964 @ 000018d 0m
07 Dec 1964 @ 0000 A19d 0m
18 Nov 1964 @ 000023d 10h 25m
25 Oct 1964 @ 133525d 17h 45m

Interval Statistics

Interval Count99
Min4d 6h 43m
Max9y 216d 9h 20m
Mean197d 21h 6m
Median23d 10h 25m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
8243 20 May 2018 @ 0805 20 May 2018 @ 0828 bbev Arrived at 8:05 to find Steamboat in mixed water/steam, north vent jetting 60 to 90 feet. Report from Bruce J who said he had arrived at 6:30 to find Steamboat in Steam phase, which changed to water at 7:50, jetting water to 90 feet. At 8:10, both vents shifted to more steam. North vent still putting water out 40-60 feet and south vent vertically 10-25 ft continuously.. Cistern Springs was 12 to 18 in. below overflow with no bubbling at all.
8240 20 May 2018 @ 0805 20 May 2018 @ 0826 bbev Arrived to find Steamboat north vent in mixed water/steam with water jetting 60 to 80' continuously. 0810 began shifting back to more steam. Report from Bruce J who arrived at 0630 was that he observed heavy steam with no water. 0750 north vent began to switch to water, jetting up to 90'. 0820 water/steam out of both vents, north jetting 40-60' , south vertically 20-30' continuously. Cistern has dropped approximately 18" below overflowed level
8241 20 May 2018 @ 0750 --- cb at 0750 Steamboat is jetting water out of the north event a hundred plus feet. It is cycling between heavy steam to periods of strong and TALL (100+ FEET) jets of water from the North vent and 30+ ft from the South vent . Cistern is down approximately 18".
8253 19 May 2018 @ 2100 19 May 2018 @ 2135 Jake I was present all day from about 10 a.m. Tom C., CB and Tara have more detailed descriptions of observations during the day. I stayed until 21:35, when it was too dark to see anything. If the report is correct that the major eruption was at 21:48, then here is the timetable for my observations. At about E-45 minutes, the activity had increased to the point that there was a surge from both the north and south vents about 60 feet high for about 10 seconds. The surge stopped and there was visible splashing from the north vent about 5-10 feet high and probably some splashing from the south vent. Splashing lasted a couple of minutes. Gradually, the surge from both vents increased in duration (but not in height) and the splashing shortened until about E-15 minutes, when the surge lasted for a couple of minutes and the splashing break only lasted about 15 seconds. The surge periods were so continuous that I wondered if I was experiencing a “weak” major eruption. The data from the seismographic data is probably correct recording the time of the major eruption at 21:48.
8237 19 May 2018 @ 1830 19 May 2018 @ 2030 Tara No eruption as of 2030. More strong minors with heavy runoff but not a lot of vertical activity in either vent.
8238 19 May 2018 @ 0900 19 May 2018 @ 2000 Tom C. No eruption as of 2000. In all ways except baseline (interminor) runoff, today's activity surpassed last Saturday's activity. By my reckoning, of 51 minors logged from 900-1315: 20 N, 3 S, 28 C.Then followed some wind shifts, rain, and a solid hour of hailstone-sized hail. There were 5 "Woo-hoo" level minors; at 1523, 1538, 1659, 1724, and 1729.
8236 19 May 2018 @ 1710 --- Tara No eruption yet. Minor play progressed to distinct minors by early afternoon. Large minors around 1530 and 1650 that put impressive runoff down channel. South Vent mostly 20-25', North Vent 25'-40' at its strongest.
8233 19 May 2018 @ 0700 19 May 2018 @ 0744 cb according to be bBev (my hubby) Steamboat activity has increased from last night's observation. Jetting from North vent has increased in height and volume. jetting from South vent with runoff moving small particles of debris. distinct pauses. all looks much like what R. Michaels described in his listserv post.
8229 18 May 2018 @ 1315 18 May 2018 @ 1400 bbev increased volume of water from this morning. 5-7 m between minors. North vent 10-30' at times. South vent surged and concerted several times, enough to wash some debris down the main runoff channel.
8228 18 May 2018 @ 0711 18 May 2018 @ 0741 bbev Light splashing/jetting from north vent 5- 15' every 1-2 m. Occasional splashing seen from South vent at lower observation deck.
8225 17 May 2018 @ 1025 --- bbev quietly steaming from both vents. saw one splash from north vent in the half hour I was watching.
8212 16 May 2018 @ 0752 --- bbev Quietly steaming with no water visible out of either rent.
8199 15 May 2018 @ 0721 --- bbev Quiet, steamy, no visble water from either vent. Boardwalk was an ice rink. Cistern Springs about 1.5' lower than last evening. No runoff under bridge. Snowshoe hares are about.
8198 14 May 2018 @ 1829 --- bbev Steady water, steam mix out of North vent, 20=30'. No water, only steam seen in South vent during the 20 minutes I was there. Steady flow of water at bridge below steamboat. some light run off in channel closer to Cistern Springs
8211 14 May 2018 @ 1000 --- MAB Generic "morning" time. VR and RS (Visitor Report and Reliable Source) both told me that on the morning of 5-14, Steamboat was doing the big minors again - estimates were from 60-100' from north vent
8179 13 May 2018 @ 1320 13 May 2018 @ 1336 Tara North Vent in mixed water/steam to 30-40 feet, South Vent weaker and mostly steam. Amount of water variable. Still putting out a low but steady flow of runoff.
8185 13 May 2018 @ 1150 --- Janet White Gently roaring - mostly steam with lovely curtains of water.
8175 13 May 2018 @ 0713 --- bbev Rumors that I would hear Steamboat from Norris government area are questionable!
8166 12 May 2018 @ 0700 --- Mkeller Mostly concerted play with occasional heavy overflow from South Vent. North Vent very active between minor play.
8159 11 May 2018 @ 0930 11 May 2018 @ 1700 Tom C. I'm reasonably certain, even accounting for drastic changes in behavior, that there was not a Steamboat major overnight. Cistern in strong overflow w/ light boiling at 0930 - same as yesterday. "Normal" minor eruptive activity had resumed in both N. & S. vents by 0930. N. vent eruptions strengthened gradually in duration and volume throughout the day, but remained in the 10-40' (length) or 10-30' (height) range all day. N. actually seemed to have more vertical surges earlier in the day than later. S. stayed in a 6'-15' range most of the day, but was largely obscured by steam after a wind change at noon. Minors were weak, constant, and hard to differentiate prior to that, but of the minors logged from 930-1200 my best guess would be: 13/25 N. start, 8/25 concerted, and 4/25 S. start. Runoff (as seen from the lower bridge over the channel) eventually covered the center of the last rock section before the bottom. The left channel and the right side of the rock remained dry. The small feature just S. of S. vent on the other side of its runoff channel was in constant steam with occasional weak spitting of water. "Restrooms cleaned & Bulbs replaced."
8154 11 May 2018 @ 1008 --- TSBryan "Chatter" reported by MA Bellingham that Steamboat erupted overnight, May 11, 2018. Tantalus Creek USGS monitor shows a stron peak (9.06 cfs) at 0500, equates to an eruption around 0315, but Norris Museum seismograph shows nothing at all. Curious.
8157 11 May 2018 @ 0600 11 May 2018 @ 0800 ypcaribou Walked far Back Basin counter-clockwise. Typical cold morning steam from Steamboat entire time. No audible steam phase. Cistern full, overflowing, blue, & clear about 0740. Steamboat splashing infrequent minors from north vent 0745-0755 to maybe 10 or 20 feet at most. It looked "back to normal" (non-major) activity. Sinter all over surrounding boardwalks but at edges & pine needles, etc, washed down hill and across walk at bottom of hill between Steamboat runoff bridge and Cistern, but probably from last weekend's activity? (We weren't in basin last weekend). We both agreed Steamboat & Cistern looked to have resumed "regular" activity. It was raining lightly as we walked from Green Dragon Spring to Cistern.
8145 10 May 2018 @ 1000 10 May 2018 @ 1400 Tom C. Chuffing steam from both vents. Occasional water from N. vent; 10'-30' on intervals from 10-30 min. No water observed from S. vent at any time. None of the small fumaroles or bubblers normally visible from the lower observation platform on the ridge between the runoff channels were active.
8124 08 May 2018 @ 1912 08 May 2018 @ 1918 Tara Gently steaming, no water.
8118 08 May 2018 @ 0930 --- cb Steamboat is VERY quiet and gently steaming from both vents. No water at all. Cistern Spring is empty
8110 07 May 2018 @ 1915 07 May 2018 @ 1930 RLJones Both North and South vents are in steady steam with no water. Steam cloud only to 120 ft. in calm winds.No water in main channel.
8094 07 May 2018 @ 0912 07 May 2018 @ 1058 udo Energizer Bunny Water Phase jusr keeps going and going. Weaker than Saturday but north is still hitting 50-70 feet and south around 20 with NO PAUSES of more than a second. Cistern appears to be refilling.
8092 07 May 2018 @ 0754 --- cb Steamboat continues! according to a Ranger I talked with on the boardwalk Steamboat restarted sometime Sunday afternoon and continues to throw water 70+ feet from North vent. Cistern has receded to just a small pool of water in the bottom of it's pool. sure wish I could add a photo here! VR told me Cistern is MUCH lower today than yesterday morning at this same time! South is cycling from water 20 - 30 feet to steam. This looks VERY similar to what we observed on Saturday 5/5/18. Go Steamboat!
8098 07 May 2018 @ 0754 --- bbev Concerted eruption, 60-80' from north vent, 20-30'from South vent. Cistern Springs almost drained. Eruption similar to what was observed on Saturday.
8114 06 May 2018 @ 0900 06 May 2018 @ 1500 sfavor Steamboat still in water phase. The observation that it restarted in the afternoon is not correct. It was on as of 9:00 AM and going strong the whole time I was there. The left vent was jetting similar to 5/5 and gained some energy from 10:00-12:00 (highest burst went from 20 to 30 degrees from the lower deck). Right vent much calmer than 5/5. Both runoff channels running. Cistern a few feet below full.
8083 05 May 2018 @ 1543 05 May 2018 @ 1626 cb Steamboat's water eruption phase activity has slowed. South vent has ceased water and steam cycle. North vent is no longer spiking water or cycling with loud steam/water spikes and has quieted down to a mixed water steam phase. The whole platform has quieted down. 1550 mix steam water returned to the South vent and North vent is back to spikes of approximately 60 feet. Cistern is down approx. 16". 1556 South vent has stopped. north vent is back to mix steam/water. 1605 North vent is cycling between steam and spikes but is mostly steam and not as loud as I would have anticipated. South vent steam. 1610 STEAMBOAT is in steam phase. Cistern spring at 1626 is slowly receding/draining. I have videos and pictures. I am amending this post. Steamboat restarted after left according to Micah and Rocco. water phased lasted until some time Monday.
8081 05 May 2018 @ 0900 05 May 2018 @ 1500 udo Erupted continuously in manner similar to minors but with water from both vents jetting much more frequently and to greater heights. North vent still hit 70 feet and south to 20 feet when I left. North was hitting 100 and south 50 upon arrival 6 hours earlier. It did not go into full roaring steam phase as I had anticipated. Runoff channels were flowing at 5-10 times rate of normal minor activity. Cistern was down 12 inches upon arrival and continued to drain slowly down to 16 inches 6 hours later just before I left. IMO Steamboat has tapped into a new, larger water source.
8076 05 May 2018 @ 1000 --- sfavor main vent steam phase. side vent spouting like minors, maybe a bit higher. both runoff channels active. new runoff over walk toward cistern last niggt.
7974 20 Apr 2018 @ 1742 --- Polly Post on Facebook that Steamboat was in steam phase at noon today. GO STEAMBOAT!!
7970 20 Apr 2018 @ 0916 --- Polly Report that onsite observer says just some steam at Steamboat & Echinus. Road into Norris is closed due to snow.
7969 20 Apr 2018 @ 0854 --- Polly (New info has confirmed the eruption.) Getting unconfirmed reports of an eruption 4/19 at about 1630. Facebook post says maintenance worker saw water above trees. YVO graphs are down but Norris Museum seismograph shows noise at that time. Also YVO Tantalus Creek graphs -all 3 graphs under hydrology - show spikes. (See attached YVO graphs. Also see other notes on yesterday’s & today’s GT.)
7971 20 Apr 2018 @ 0830 --- ypcaribou Drove by junction and observed: Nothing really that spectacular...some steam from Steamboat/Echinus area but nothing big. Road into Norris GB closed.
7968 19 Apr 2018 @ 1700 --- ypcaribou Reported to Robert Cash, who saw a video. RE Video: Steam from Norris but not as high as Steamboat usually is. Pretty loud however steam cloud not huge like a Major. NPS maintence, per Amy Trautman on Facebook, saw water above trees about 1630 4-19.
7961 15 Mar 2018 @ 0521 --- DGInc Logger data shows that a spike occurred. Before this spike, the temperature was about 8-9°C. 28 minutes before this spike occurred, @ 0453, temperature started to rise, but slowed. Thereafter, @ 0513, temperature began rising again, but slowed too, to rise again @ 0519 and quite rapidly from 0521 (about 2.5°C per two minutes). The spike reached its maximum @ 0537 (33.7°C). Afterwards the temperature drops to about 5-10°C above Nuphar Lake graph ambiance temperature.
7951 28 Feb 2018 @ 0001 04 Mar 2018 @ 1700 Polly Steamboat YVO graph is back up. The dip on March 3rd looks like a normal ~6-10 day cyclic drop.
7540 29 Sep 2017 @ 1430 --- Tara Very weak, wispy splashing every few minutes; hardly any discharge.
7300 25 Sep 2017 @ 1355 --- Polly YVO graph appears to show a disturbance in the basin.
6246 09 Sep 2017 @ 1830 --- Kitt B NO STEAMBOAT ERUPTION! CONFIRMED BY LIST OF OBSERVERS.
6147 09 Sep 2017 @ 0736 09 Sep 2017 @ 0750 ypcaribou Multiple concerted minors in a row about 2 minutes apart. Cascading water down hill from south vent. North vent higher for most but 2 had a taller south vent splashes. Full puddle of water at bottom of hill at boardwalk.
5789 04 Sep 2017 @ 1445 04 Sep 2017 @ 1545 Polly I got 60% concerted this hour, but think I missed some North Vents due to wind and steam. Actual percentage was probably higher.
5738 04 Sep 2017 @ 0834 04 Sep 2017 @ 0934 Polly In an hour of observation, I got 80% concerted minor starts. YVO graph has not been updated but Steamboat should be on its way out of the dip of it's 10 day cycle.
5019 12 Aug 2017 @ 1212 12 Aug 2017 @ 1233 Ben VL 29 minors took place in this time. 41% were concerted, and of those one was a concerted start and the rest were north vent initiated. The rest were north solos except for one south solo. When it got heavily involved, the south vent was definitely putting out more volume than north was (I feel like north vent's jets are still a little thin, although I need more experience to say for sure), and it increased runoff signifigantly. You could watch it cascade down the runoff channel. The steady runoff was slightly greater than yesterday, today is the second or third day of increasing temperatures after the dip. The overall minor activity and runoff seemed of similar strength (maybee a little stronger) to what I saw on June 9 and 10 in the middle of Steamboat's temperature cycle.
4835 08 Aug 2017 @ 0239 --- Graham Reported "Not major but 100 ft minor". Would like some additional confirmation as it was the 3rd entry from the user and their first 4 entries included two webam times (one webcam BHI followed by a non-webcam BH) yesterday, and a BH Webcam time today which was off by several minutes. Converting their eruption time to a note for the record.
4535 25 Jul 2017 @ 1100 25 Jul 2017 @ 1145 Polly Still having good runoff from some minors. (Didn't take notes on amount of concerted minors today.) Chance for possible eruption likely over for this cycle, but may want to keep an eye on it next time the YVO temperature graph peaks. (Steamboat temperatures have been in a good rhythm the last few cycles. The last two eruptions came on the rise in temperatures after a good dip. Best guess for the new cycle is about August 3-5. )
4526 24 Jul 2017 @ 0905 24 Jul 2017 @ 1105 Polly I got 81% concerted minors the first hour and 83% concerted the second hour. Several South jets and a few North jets observed.
4488 30 Jun 2017 @ 1004 30 Jun 2017 @ 1104 Polly Steamy morning (rained yesterday), so hard to get an accurate percentage of concerted minors. Observation included a couple of nice minors - two that were ~18 seconds long with lots of runoff and another that was one of the best minors I've ever seen (thick, full, lots of runoff). These 3 all had concerted starts.
4271 08 Jun 2017 @ 0923 08 Jun 2017 @ 1023 Polly 58% concerted minors and 38% North Vent initiated. Some North Vent jets and South Vent jets observed. Well defined minors.
3532 23 Aug 2016 @ 0901 --- udo North vent solo moderate volume 0901, South vent is not producing as much volume as it was a week ago. No audible cascade-like overflow in runoff channel. Concerted minors are thin when they happen. 0955 1st audible cascade from South vent solo in an hour, then1002, 1032 (good height & volume dual),
3500 17 Aug 2016 @ 0905 --- udo Overall impression - output is greater than what I saw earlier this year - Feb, Jun & Jul. North vent not producing much volume in 95% of concerted jetting. Large surges and audible cascade-like overflow from South vent at 0905, 0910, 0912, 0918, 0935, 0937, 0953, 0955, 0959, 1004, 1008, 1032, 1048, 1058, 1101, 1107, 1112, 1126, 1129, 1131, 1141, 1203, 1205, 1207, 1212, 1213, 1223, 1225, 1226, 1236, 1238, 1242. BATHROOM! Heavy north solo 1045, heavy dual 1135, moderate dual 1157, heavy dual 1239
2586 29 Oct 2015 @ 1305 29 Oct 2015 @ 1318 billwarnock Steamboat is still in "zap" mode; no water from either north or south vents. Moderate steady steam.
2410 23 Sep 2015 @ 0950 23 Sep 2015 @ 1010 billwarnock Steamboat is still in "zap" mode with no minor eruptions and no overflow down channel.
2397 21 Sep 2015 @ 1520 --- MAB runoff channel below Steamboat on the way to Echinus - completely dry
2100 10 Aug 2015 @ 1155 10 Aug 2015 @ 1210 Micah Kipple For the very short time I was on the lower platform there were at least 3 strong concerted minors.
2021 05 Aug 2015 @ 2103 05 Aug 2015 @ 2132 RyanMaurer Obviously weak activity. watched for about a half hour. Near constant minor activity that would wax and wane. A "surge" would send water out of both vents simultaneously. The initial surges sent sustained water to above tree level from the North vent and to half way up the trees from the South vent. The first three held this jetting for about 20-25 seconds each and then would die down, build up, and die down until it almost stopped when it would immediately do another surge. The last two were concerted but weaker and not as consistent. Water output from North was wispy at best but did send waves down the channels. Water from south was heavy - Aurum like? Knowing how my statements get taken I'll state very clearly that I know this is very weak activity. The tall, sustained, and concerted activity was interesting enough that I felt it necessary to leave a note here - just in case ;)
1716 10 Jun 2015 @ 1227 --- udo For about an hour north vent shot above the trees around every 2 to 6 minutes in thin jets. South vent joined about 80% with some volume at times but was height challenged. September is coming.
1199 04 Sep 2014 @ 0000 --- Andrew Steamboat is believed to have had a major last night at about 2300-2350 hours.
1069 12 May 2014 @ 0847 --- Polly At 0847, a strong minor produced runoff that was like a mini-river.  I could hear it travel all of the way down the hill.  During the morning, my percentages of concerted minors were 85-87%.  Again, I saw some jetting in both the South and North Vents.  At times, I heard roaring coming from the South Vent area.  The wind was blowing towards me much of the morning, which probably enhanced the sounds.  It was steamy and hard to tell how high the South Vent minors were.  In the afternoon, the percent concerted had dropped to about 66%, but the runoff increased.  I left at 1400, but the YVO temperature graph shows another spike to ~32 degrees Celcius about 2 hours later.
1068 11 May 2014 @ 1444 11 May 2014 @ 1544 Polly Minors appeared to be about 50% concerted during the hour 1444-1544.  It was steamy and the wind was blowing toward me, so visibility was an issue.  I did see some jetting in both the South and the North Vents.  At times, there was a steamy pressure sound coming from near the South Vent.  The runoff was, at times, the heaviest that I have ever seen.  Two of the minors produced a deep rumble that I have not heard before.  The poor visibility kept me from seeing how high the South Vent went on those minors (my guess is not much higher than the trees), but they sounded strong.  This coincided with a high a ~32 degrees Celcius peak on the YVO temperature graph.
1054 27 Apr 2014 @ 0000 27 Apr 2014 @ 1200 Polly My brother Bob reports that he only had about 49% concerted this morning with low water.  He says that there is very little steam throughout the back basin this morning despite the low outdoor temperature.
1053 26 Apr 2014 @ 0000 26 Apr 2014 @ 2359 Polly My brother, Bob Partner, had just over 90% concerted minors during 2 nonconsecutive hours today.  He only counted those minors lasting longer than 30 seconds, so my percentage would probably have been lower.  He had one minor about 150% of the tops of the trees (standing on the mid-level platform).  Overall, though, he said runoff was low and most minors were on the short side.  Temperature graph from YVO has been down since 4/22 but likely dipped yesterday and rising today.  He left the area due to deteriorating snowstorm conditions.
1048 20 Apr 2014 @ 1548 20 Apr 2014 @ 1648 WillBoekel From 1548-1648 for minors there were 40 North Vent starts, 2 South vent starts, and 26 simultaneous starts.
7106 08 Jul 1996 @ 0815 08 Jul 1996 @ 0900 research-mab 07/08/1966 Steamboat – Took temps again 200º S. vent. 198 ½ N vent. Between 8:15 & 9am. Minor eruptions were less continuous than yesterday and drainage channel a little drier. About 9am however activity was vigorous for several minutes about like yesterday. Water levels bout the same.
7577 29 Jan 1989 @ 1152 --- JSJ Boiling audible at depth. No surface minor play.
7575 09 Apr 1988 @ 0000 09 Apr 1988 @ 2359 JSJ Steamboat Geyser has no minor play. Hydrophane Springs' water level was down ~1 meter for ~1 week (estimated). These were the only two signs of a possible minor Norris disturbance.
7636 02 Mar 1985 @ 1800 --- research-mab 3-02-85 Steamboat blue ice formation estimated 2m high
7631 12 Apr 1984 @ 1800 --- research-mab 4-12-84 Steamboat has very weak minor play – very long recovery from ~3-15-84 eruption.
7610 11 Feb 1984 @ 1800 --- research-mab 02/11/1984 Steamboat Geyser – minor plays up to 12m small & irregular runoff downslope under footbridge at base of slope. Ice formation west of main vent is blue in color & over 1m high.
7668 11 Mar 1982 @ 0800 --- research-mab 3-11-82 Steamboat was very quiet when first observed at 0800 this am – indicating that its steam phase lasted less than 24 hrs. Fist sized altered tuff rock ~20m dia fragments were ejected out on snow pack as far as ~70m upslope from upper vent.
7665 10 Feb 1982 @ 1800 --- research-mab 2-10-82 Steamboat has very massive minor play out of both vents such that an ornate ice formation has built up on the NE to SW sides of the vents & a very obvious runoff is present down to the base of the hill. With height & volume the minor play is some of the most impressive this observer has witnessed in the last 12 years.
7658 24 Jan 1979 @ 1800 --- research-mab 1/24/1979 Ice mound by Steamboat ~1 ½ m high.
5332 24 Aug 1978 @ 0730 24 Aug 1978 @ 1030 research-mab 08/24/1978 Steamboat isn’t over yet! At approximately ~735, a new water phase period began throwing water (sometimes mud) 100-150 feet into the air out of the North vent. Not as loud as yesterday. Some water flowing over the boardwalk. Activity ceased at about 1014 hrs. Water height out of the south vent was a estimated… {log here is blank}
5091 28 Mar 1978 @ 1800 --- research-mab 03/28/1978 Steamboat awakens after 9 years!!! At approx 10:15, a YACC crew heard & saw the geyser in a major eruption. Heights were estimated between 300-400’. Cars in the parking log were drenched! Nearly all of Mammoth turned out to witness the big event. When viewed at 6:00 pm, coarse gravel could be seen all over the snow on the hill, in the Steamboat area. Large amounts of material from the hill were washed onto the boardwalk below. Steam was roaring out of both vents, and a deep thudding could still be heard near the vent. Cistern Springs showed a dramatic change – water level down approx. 2 feet, no boiling.
7663 09 Mar 1978 @ 1800 --- research-mab 03/23/1978 Thermal changes observed from 3/6-9/1978 Steamboat Geyser – more active; bursts more massive, longer duration & higher.
5691 06 Sep 1975 @ 1800 --- research-mab 09/06/1975 A little water being emitted from Steamboat today.
5638 18 Aug 1975 @ 1800 --- research-mab 08/18/1975 Steamboat putting out more spray than usual. (today- no time}
5837 21 Sep 1974 @ 1800 --- research-mab 09/21/1974 Steamboat – good minor activity from both vents, Can be heard from the vicinity of Echinus {no time noted}
5831 20 Sep 1974 @ 1800 --- research-mab 09/20/1974 Steamboat – some good minor activity today.
5807 07 Sep 1974 @ 1800 --- research-mab 09/07/1974 Steamboat – seems to be putting out more H20 than it has been most of the summer
6162 19 Sep 1973 @ 1000 --- research-mab 09/19/1973 Back Basin 10:00 am Steamboat still with a lot of water shooting 10-15’ from both vents.
Baseline does not exist.


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