Last Known Eruption
3y 20d 20h 39m ago

Latest Eruptions

EruptionDurationInterval
03 Sep 2014 @ 2243 E maj23m 1y 34d 3h 13m
31 Jul 2013 @ 1930 E maj6y 162d 2h 30m
21 Feb 2007 @ 16005h 0m
21 Feb 2007 @ 1100 min1y 273d 21h 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 18h 50m
24 May 1984 @ 0500 A maj~15m 269d 15h 2m
28 Aug 1983 @ 135865d 18h 33m
23 Jun 1983 @ 192516m 256d 23h 25m
09 Oct 1982 @ 2000 A19d 9h 23m
20 Sep 1982 @ 103715m 13d 23h 0m
06 Sep 1982 @ 1136:2033d 2h 33m
04 Aug 1982 @ 0903 maj43d 9h 3m
22 Jun 1982 @ 0000 ? A13d 16h 10m
08 Jun 1982 @ 07507d 7h 50m
01 Jun 1982 @ 0000 A11d 12h 6m
20 May 1982 @ 1154 maj96d 18h 54m
12 Feb 1982 @ 1600 A29d 23h 0m
13 Jan 1982 @ 1700 A2y 210d 2h 34m
18 Jun 1979 @ 1526299d 7h 23m
23 Aug 1978 @ 0803 maj147d 20h 33m
28 Mar 1978 @ 10303y 218d 3h 27m
23 Aug 1974 @ 0803147d 21h 33m
28 Mar 1974 @ 103030m 8y 199d 12h 41m
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 A80d 14h 25m
25 Oct 1964 @ 133525d 17h 45m
29 Sep 1964 @ 19509d 7h 5m
20 Sep 1964 @ 12457m 6d 14h 15m
13 Sep 1964 @ 22308d 15h 0m
05 Sep 1964 @ 07309d 17h 37m
26 Aug 1964 @ 13539d 5h 43m
17 Aug 1964 @ 08105m 8d 11h 0m
08 Aug 1964 @ 21108d 20h 10m
31 Jul 1964 @ 01007d 20h 55m
23 Jul 1964 @ 04056d 6h 35m
16 Jul 1964 @ 21306d 3h 20m
10 Jul 1964 @ 181010m 7d 20h 40m
02 Jul 1964 @ 21304d 19h 15m
28 Jun 1964 @ 02155d 15h 15m
22 Jun 1964 @ 11005m 7d 15m
15 Jun 1964 @ 10455d 20h 0m
09 Jun 1964 @ 144512d 4h 10m
28 May 1964 @ 103510m 10d 11h 20m
17 May 1964 @ 231514m

Interval Statistics

Interval Count72
Min5h 0m
Max8y 214d 14h 11m
Mean255d 3h 38m
Median19d 2h 41m

Latest Notes

Note IDStart TimeEnd TimeEntrantNote
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.
5332 24 Aug 1978 @ 0730 24 Aug 1978 @ 1030 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 --- 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.
5691 06 Sep 1975 @ 1800 --- MAB 09/06/1975 A little water being emitted from Steamboat today.
5638 18 Aug 1975 @ 1800 --- MAB 08/18/1975 Steamboat putting out more spray than usual. (today- no time}
5837 21 Sep 1974 @ 1800 --- 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 --- MAB 09/20/1974 Steamboat – some good minor activity today.
5807 07 Sep 1974 @ 1800 --- 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 --- MAB 09/19/1973 Back Basin 10:00 am Steamboat still with a lot of water shooting 10-15’ from both vents.
6158 18 Sep 1973 @ 1800 --- MAB 09/18/1973 Steamboat H20 to 10-15’ water now commonly coming from main vent.
6136 10 Sep 1973 @ 0830 --- MAB 09/10/1973 0830 Steamboat seen with H20 yesterday and again today for the first time since?
6053 11 Aug 1973 @ 1800 --- MAB 08/11/1973 {generic time} Also Steamboat and Africa very active
6046 06 Aug 1973 @ 1800 --- MAB 08/06/1973 Steamboat minor play seen 30-40 ft highest as has been seen by this observer in two weeks {no time}
6029 07 Jul 1973 @ 1800 --- MAB 07/07/1973 Steamboat more spray and steam jets of water to 50 ft and water lasting to 25 sec. {no time}
6010 11 Jun 1973 @ 0920 --- MAB 06/11/1973 Steamboat again today to heights of about 60 or more, a solid column of steam rose well over 100 feet at 920
6453 06 Sep 1972 @ 1000 --- MAB 09/06/1972 Witnessed the best minor play from Steamboat this morning all summer {generic a.m. time}
6443 31 Aug 1972 @ 1622 --- MAB 08/31/1972 Steamboat had minor play at 4:22pm 5-10’ - first observed in a long time.
6385 12 Aug 1972 @ 1800 --- MAB 08/12/1972 Steamboat apparently still hasn’t had any minor play.
6313 14 May 1972 @ 1800 --- MAB 05/14/1972 The following geysers have been seen erupting since I arrived last night: Ledge 6-10’, Iris 2-3’, Little Whirligig 15’, Basin 1’-2’, Fan 4’-5’, Bear Den, Feisty, Fireball 2-3’, Minute 1’-2’, Blue 7-15’, Africa 25-35’, Vixen 7’-15’, Dr Morey’s Porkchop 3’-5’, Echinus 10’-40’, Steamboat 5-20’
6474 02 Oct 1971 @ 1800 --- MAB 10/02/1971 Steamboat – no observed minor play {during day}
6518 12 Sep 1971 @ 1800 --- MAB 09/12/1971 Steamboat Geyser – all the water was gone from the 2 vents and no true minor play has been seen for the past 2 days – just a little spray from the north vent, the geyserite to the south has dried & turned from pink to white
6533 10 Sep 1971 @ 1700 --- MAB 09/10/1971 Steamboat Geyser – a very small amount of water was thrown out of the vents from the minor play at about 5:00 PM
6535 10 Sep 1971 @ 0900 --- MAB 09/10/1971 No change in Steamboat – putting out copious amounts of steam, but no water. {morning - no time noted}
6554 11 Jul 1971 @ 1800 --- MAB 07/11/1971 Mrs Decker came in this P.M. to look at Steamboat.
7025 20 Sep 1965 @ 1015 --- MAB 09/20/1965 Steamboat – Kind of quiet this morning H2O in N. vent is only down about 5 ft. Good burst from N. vent at 10:15 am. S. vent still not as active as it has been.
7024 19 Sep 1965 @ 0800 19 Sep 1965 @ 1800 MAB 09/19/1965 Steamboat – Very active in A.M. - Some very good minor eruptions. Has quieted down some this P.M. - Minor eruptions are less frequent.
7023 18 Sep 1965 @ 0830 18 Sep 1965 @ 1800 MAB 09/18/1965 Steamboat – Good minor plays this A.M. - N. vent is splashing H2O occasionally. H2O is still down in N. vent at 8:30 am - Still down in PM.
7022 17 Sep 1965 @ 0800 17 Sep 1965 @ 1430 MAB 09/17/1965 Steamboat – Water has returned today, but none has gone down the channel yet. So. Vent playing 15-20 ft. every few minutes. H2O down channel at 2:30 pm.
7021 16 Sep 1965 @ 1800 --- MAB 09/16/1965 Steamboat – No H2O visible in A.M. - Still no H2O present in P.M. - It can be heard in the N. vent, but it is still way down in the tube.
7020 15 Sep 1965 @ 1800 --- MAB 09/15/1965 Steamboat – Still no H2O visible in either vent – Steam under good pressure – roaring intermittently. South vent appears to be putting out fine mist (may be rain which has collected in vent & being thrown out)
6997 14 Sep 1965 @ 0800 --- MAB 09/14/1965 Steamboat – H2O still down in N. vent – occasional fine mist sprays fm. S. vent (AM)
7018 13 Sep 1965 @ 0800 13 Sep 1965 @ 1550 MAB 09/13/1965 Steamboat – Billowing steam, S. vent very quiet. N. vent – faint or muffled sloshing sound way down. Steam under slight pressure. At 3:50 pm Activity is much the same as this morning.
7016 12 Sep 1965 @ 0800 12 Sep 1965 @ 1630 MAB 09/12/1965 Steamboat 8am Both vents billowing steam under pressure, roaring noise has diminished to a low muffled sound. N. vent is sending up at good deal of spray yet Observation platform is coated with sand & grit. 430Pm: steam billowing gently, out at the vents there is occasional a sound like the wind blowing through a tunnel.
7015 11 Sep 1965 @ 0820 11 Sep 1965 @ 1650 MAB 09/11/1965 Steamboat 8:20 am S vent: Strong 25’ plays every 2-5 min. No. vent water just below ledge – splashing constantly sometimes 10-15’ beyond the vent. 2:45 pm Drainage channel rather dry. S. vent has considerable water but not very active. N. vent water level at or below ledge – very active- makes level determination very difficult. At times it seems to be almost be explosive 4:50 pm water highest in both vents that I’ve seen all summer – Every 10 min or so S. vent plays up to 40’ - wind blowing it back however.
7014 10 Sep 1965 @ 0830 10 Sep 1965 @ 1630 MAB 09/10/1965 Steamboat – S. vent strong minor plays every few minutes. N. vent water at same level as yesterday but almost completely agitated (8:30 am) with splashing several feet above surface 430pm: N. vent water up to ledge, very agitated.
7011 09 Sep 1965 @ 0800 09 Sep 1965 @ 1645 MAB 09/09/1965 Steamboat – Still putting out copious amts of H2O down S. channel. - N. vent had several 15-20’ bursts fm N. vent at 8:35am. At 4:45p water in N. vent still only 3’ below ledge.
7012 08 Sep 1965 @ 1800 --- MAB 09/08/1965 Steamboat – 25’ eruption fm S. vent every minute or two. N. vent 4-5’ below ledge, occasional splashing some 10’ high – H2O level had risen to 2-3’ fm top (N. vent) {generic afternoon time} Railing crew laying boardwalk by Steamboat overlook.
7008 07 Sep 1965 @ 1800 --- MAB 09/07/1965 Steamboat – Continues to put out lots of H2O down S. channel. {generic time}
7005 06 Sep 1965 @ 1800 --- MAB 09/06/1965 Steamboat – Many frequent eruptions fm. S. vent – 30-40’ in ht. {no specific times}
7003 05 Sep 1965 @ 0800 05 Sep 1965 @ 1700 MAB 09/05/1965 Steamboat – Putting out lots of H2O from S. vent. N. vent is splashing periodically too. (AM) Minor eruptions improving during PM - ~~ 50-60 ft.
7001 04 Sep 1965 @ 0800 04 Sep 1965 @ 1600 MAB 09/04/1965 Steamboat S. vent – Minor eruptions 10’ infrequently. A small amount of drainage extends to about halfway down the channel. N. vent Hard to see the water – continually splashing probably way down below the ledge. At times there is a roar of steam just for several seconds. 440Pm Copious minor eruptions – not enough water yet to go completely down channel. N. vent – water visible 6-8’ below ledge & active.
7000 03 Sep 1965 @ 0800 03 Sep 1965 @ 1700 MAB 09/03/1965 Steamboat – Water in S. vent occasionally erupting 2’ high as a fine spray. Considerable steam pressure in both vents. Splashing audible in N. vent but water still not visible. Drainage channel still dry. At noon – no spraying observed. 5pm- water barely visible in N. vent – Not as much steaming. Locomotive puffing sound.
6999 02 Sep 1965 @ 0800 02 Sep 1965 @ 1700 MAB 09/02/1965 Steamboat – S. vent still rather quiet N. vent: Hot steam still billowing. Splashing sound way down – at times seems to surge closer but it still not visible. 5Pm looks much the same as this morning. Sound of water in N. vent does seem closer however but still not visible.
6998 01 Sep 1965 @ 0815 01 Sep 1965 @ 1730 MAB 09/01/1965 Steamboat – H2O present at 8:15am in N. vent – Still way down. 5:30 pm S. vent rather quiet. Little steam. No. vent – Hot steam- observation difficult. No water visible but muffled splashing sound way down can be heard.
7042 31 Aug 1965 @ 0815 31 Aug 1965 @ 1615 MAB 08/31/1965 Steamboat – Water still gurgling in No. vent at 8:15 am, but none splashing. H2O could be heard in No. vent (way down there) at 4:15pm.
7038 30 Aug 1965 @ 0735 30 Aug 1965 @ 0830 MAB 08/30/1965 Steamboat – Quietly steaming at 7:35 am. Water can be heard gurgling in No vent at 8:30 am.
7037 28 Aug 1965 @ 1500 --- MAB 08/28/1965 Steamboat – N. vent water 8’ below ledge moderately active. S. vent- Minor 20’ plays every few min. Considerable yellow algae in runoff channel. 3pm- Drainage channel quite dry: strong wind is blowing good S vent plays back into both vents.
7036 27 Aug 1965 @ 1800 --- MAB 08/27/1965 Steamboat- N. vent water nearly to ledge, receiving considerable splashing over from S. vent; occasionally active. S. vent rather powerful 30’ plays every few minutes. Appears to be a greater than usual amount of water going down drainage channel.
7033 26 Aug 1965 @ 0820 --- MAB 08/26/1965 Steamboat – at 8:20 N vent water back down 2-3’ below ledge, slightly active. S. vent Strong 30-40’ plays every several minutes – considerable runoff. Very quiet in between.
6991 25 Aug 1965 @ 0845 25 Aug 1965 @ 1730 MAB 08/25/1965 Steamboat – Some good bursts from S. vent at 8:45a. Has been putting out lots of H2O again this morning. 5:30p Very good S vent plays every 10 min very quiet otherwise. N vent – water up to ledge but violent wind is bringing S vent plays into it.
6988 24 Aug 1965 @ 0830 --- MAB 08/24/1965 Steamboat – Not quite as much H2O down drainage this AM. 20’ burst from No. vent at 8:30 am. Water below ledge and constantly agitated at 8:30am.
6985 23 Aug 1965 @ 0800 --- MAB 08/23/1965 Steamboat – Good eruptions from So. Vent in AM. Lots ofH2O down drainage channel. Water below ledge in No. vent.
6983 22 Aug 1965 @ 0800 --- MAB 08/22/1965 Steamboat – H2O in No. vent is continuously agitated. Lots of H2O down drainage this AM.
6981 21 Aug 1965 @ 0800 --- MAB 08/21/1965 Steamboat – N vent water 2-3’ below ledge, very active occasional splashing to surface. S. vent 15-20’ spouting, considerable water going down channel.
6980 20 Aug 1965 @ 0820 --- MAB 08/20/1965 Steamboat 820am N vent – Very active Level 2-3 below ledge but splashing frequently, occasionally 15’ high. S. Vent copious minor eruptions as usual 10-15’ high.
6977 19 Aug 1965 @ 0830 19 Aug 1965 @ 1215 MAB 08/19/1965 Steamboat 830am N.Vent water 4-5’ below ledge but intermittently active with splashing to surface. S. vent plays about 10-15’ frequently with lots of runoff. N. vent very active at 12:15p – H2O splashes out of N. vent for 5 min.
6979 18 Aug 1965 @ 0800 --- MAB 08/18/1965 Steamboat – S. vent having frequent plays in AM – Lots of H2O down channel.
6976 17 Aug 1965 @ 0815 --- MAB 08/17/1965 Steamboat – frequent strong plays from So vent at 8:15a.m. Water below ledge in No. vent & splashing above rim 3-4’ now & then. Copious water down drainage channel.
6975 16 Aug 1965 @ 0850 --- MAB 08/16/1965 Steamboat – Putting out lots of H2O this AM – N. vent had a good burst at 8:50AM
6971 14 Aug 1965 @ 0820 14 Aug 1965 @ 1700 MAB 08/14/1965 Steamboat 8:20AM: Very much like yesterday N. vent water at ledge & active. S. vent copious eruptions but more water down drainage channel than yesterday. At 920am S vent plays 50’ every 5 min. At 2:45 N vent water 2’ lower than this AM. Water below ledge at 4:30pm & continuously agitated. Am’t of H2O going down drainage decreased during PM.
6969 13 Aug 1965 @ 0820 13 Aug 1965 @ 1230 MAB 08/13/1965 Steamboat - At 8:20 am: N. Vent : water up to ledge, moderately active . S. vent 20 sec, fountain type plays 15-20’ high every min or so. Water visible in vents. Not much going down drainage channel, mostly draining back into S and N vent. Water down about 4’ at 11:30 am. At 12:30 pm a good 75’ burst from So vent. No. vent splashed after each strong play from So vent.
6968 12 Aug 1965 @ 0830 12 Aug 1965 @ 1630 MAB 08/12/1965 Steamboat – AT 8:30 AM N. Vent water visible 12’ down & very active. S. Vent during several min of obsvtn, was very active plays only 10-15’ high but 15’sec of duration – looked more explosive with lots of steam than high spouting of a few days ago. At 2PM water in N Vent nearly up to ledge and active. Water plainly visible in S. vent by 430PM. S vent minor eruptions of 20-40’ & splashing from N.Vent followed by 15 minutes of relative quiet.
6967 11 Aug 1965 @ 0845 11 Aug 1965 @ 1800 MAB 08/11/1965 Steamboat – Fairly quiet early – began putting out lots of H2O at 8:45am. Had several good plays from N. vent in P.M.
6966 10 Aug 1965 @ 0905 --- MAB 08/10/1965 Steamboat – 40’ burst out of No vent at 9:05 am. Water below ledge & very agitated early a.m.
6964 09 Aug 1965 @ 0820 --- MAB 08/09/1965 Steamboat- No. vent wildly & continuously agitated at 8:20am. Spurting angularly about 15-20’ frequently. Not much H2O down runoff channel.
7034 08 Aug 1965 @ 1800 --- MAB 08/08/1965 Steamboat – Lots of water down drainage this AM. Water still below ledge & very agitated. Copious water down channel continued in PM. There were some strong surges from So. Vent in PM.
6962 07 Aug 1965 @ 0800 07 Aug 1965 @ 1715 MAB 08/07/1965 Steamboat – Water below ledge in AM. Still putting out lots of H2O in AM. Had a very strong play at 10:40 good action from N. vent. Amt. Of H2O down drainage slackened off by noon. Ten ft. play from No. vent at 12:55 pm. 4:5- - 5:15 pm: S. vent quieter than earlier.
6961 06 Aug 1965 @ 0830 06 Aug 1965 @ 1545 MAB 08/06/1965 Steamboat At 830am N Vent water down 15’ & quiet. S. vent 20’-30’ eruptions 15 sec duration every minute or so. 3:45pm Plays are less frequent but quite powerful with splashing from N. Vent. Lots of H2O down dr {word not completed mab}
6959 05 Aug 1965 @ 0820 05 Aug 1965 @ 1200 MAB 08/05/1965 Steamboat at 8:20am: N. vent water down 15’, and relatively quiet. S. vent Copious eruptions 15-20’ high. Appears to be discharging more water than yester… Noon: relatively quiet. Drainage channel fairly dry.
6957 04 Aug 1965 @ 1200 --- MAB 08/04/1965 Steamboat – still putting out lots of H2O – No shots from the N. vent were seen early this AM
6956 03 Aug 1965 @ 0750 03 Aug 1965 @ 0910 MAB 08/03/1965 Steamboat - No sustained plays from 7:50 until 9:10a – then a short, sustained play. Quite a lot of H2O had been put out during night.
6955 02 Aug 1965 @ 1800 --- MAB 08/02/1965 Steamboat – Putting out lots of H2O all AM – Several small bursts were seen from the N. vent at 12:45p, but nothing of any consequence. Big burst about 30’ high from North vent at 2:30pm. Less water down runoff channel in PM.
6954 01 Aug 1965 @ 0800 01 Aug 1965 @ 1710 MAB 08/01/1965 Steamboat – More H2O down channel than yesterday. Water in No vent still below ledge. By noon the amount of H2O down runoff channel greatly decreased. A good burst from the N. vent at 12:30 – simultaneously there was a good play from fm the S. vent. 08/01/1965 Little Whirligig Dry at 10:10am, Dry at 5:10pm
6952 31 Jul 1965 @ 0830 31 Jul 1965 @ 1720 MAB 07/31/1965 Steamboat – at 8:30 N vent water visible 10’ down & splashing occasionally. S vent minor plays (15’) of few sec. Duration every ½ to 1 min. Not as much water going out as yesterday. Good play about 5:20 pm from N. vent. More water down runoff channel than yesterday.
6950 30 Jul 1965 @ 0830 30 Jul 1965 @ 1030 MAB 07/30/1965 Steamboat – At 830 am N Vent water down 10’ & active. Occasional splashing. S vent. Minor plays every minute or so. At 10:30 eruptions were more frequent and are releasing more water. Abundance of steam (=hotter?) {different observer-->} Runoff channel relatively dry?
6947 29 Jul 1965 @ 0820 29 Jul 1965 @ 0845 MAB 07/29/1965 Steamboat – Was quiet early – 8:20 – had some good plays at 8:45. N. vent appears to be higher today.
6942 24 Jul 1965 @ 0845 --- MAB 07/24/1965 Steamboat at 8:45AM – N. vent, water down about 12-15’ but active with minor playing. S. vent minor eruption (15) for small… then withdrawal of water out of sight. About 15’ later minor eruptions of 20-30’ high began every few minutes with abundant runoff.
Baseline does not exist.


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