Last Known Eruption
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Latest Eruptions

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Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
9276 23 Jul 2018 @ 0944 --- cb Cistern Spring is up to the edge of the inner tube.
9274 22 Jul 2018 @ 2114 22 Jul 2018 @ 2121 bbev Cistern Springs appears to have drained and is now vigorously boiling, grey and murky, unlike the clear pool of this morning. 4' below rim of inner "tube".
9272 22 Jul 2018 @ 0930 --- bbev Cistern Springs nearly drained, clear, no bubling/boiling seen, water barely disable from deck above.
9267 21 Jul 2018 @ 2040 --- bbev Cistern Springs is down 20-22" from overflow with occasional bubble in center. Most remarkable is that most of overflow area has turned completely white,
9251 20 Jul 2018 @ 0801 --- udo Overflowing into all runoff channels as best as I can see thru the steam. (Cool quiet morning.)
9208 15 Jul 2018 @ 1825 15 Jul 2018 @ 1950 MAB (1825-1950 observations from CB-separated by request:) Cistern Spring still high, clear, blue & overflowing w a 1.5 diameter weak boil. Overflow is starting to reach the muddy pool by the boardwalk.
9186 14 Jul 2018 @ 2021 --- cb Cistern Spring is high, blue, clear and in overflow. It has a 2 vent boil about 2' in diameter.
9181 14 Jul 2018 @ 0645 --- cb Cistern Spring pool is high and overflowing from all sides.
9164 12 Jul 2018 @ 1642 --- buczek Cistern appears to be at the same level as yesterday, a couple of feet below the top of the rim or a few inches below the thick log.
9159 12 Jul 2018 @ 1050 --- cb Cistern is still at the same level as yesterday. approximately 38" down from the rim. it is not as yellow as yesterday but has a yellow/blue hue to the pool.
9143 11 Jul 2018 @ 1850 --- cb Cistern Spring fill is at the same level as this morning (at the end of the thick log) and is the same yellowish color with a very aggressive 2 vent boil. Boil at times reaches 6 - 8" in height. Rocks and sticks in Cisterns pool are becoming coated in yellow.
9128 11 Jul 2018 @ 0905 --- Tara Down about 2 feet from upper rim, a few inches above top of lower tube. Boiling vigorously to 4-6" from center of pool with yellow water. No change when I checked again at 1030.
9102 10 Jul 2018 @ 0855 --- udo Quiet. Barely bubbling. About 3 feet below overflow.
9047 06 Jul 2018 @ 1440 --- udo About an inch below overflow an hour after Steamboat start.
9045 06 Jul 2018 @ 1306 --- udo Doming vigorous boil about 4 feet diameter.
9044 06 Jul 2018 @ 0730 --- udo Overflowing in all normal directions. Too steamy to see boiling but it is audible.
8945 29 Jun 2018 @ 1808 --- cb Cistern Spring water level is a tad fuller and sending convection waves into the runoff catch basins on the edge of the pool. Still blue/green and fairly clear.
8881 21 Jun 2018 @ 0900 --- Polly Cistern Spring has some overflow and I can hear some boiling (steamy).
8825 20 Jun 2018 @ 2015 --- udo Overflowing, 3 foot diameter vigorous boil in center.
8777 19 Jun 2018 @ 0710 --- cb Cistern Spring is in overflow with a 2' diameter boil in the center.
8771 18 Jun 2018 @ 1940 18 Jun 2018 @ 2038 Tara At 1940, about 1 foot below rim and boiling to 4-6 inches from an area about 3 feet in diameter in the center of the pool. Slightly higher water level upon return at 2038.
8768 18 Jun 2018 @ 1828 --- udo About 18" below overflow. Murky and having steady upwelling with occasional doming to about a foot max.
8764 18 Jun 2018 @ 1720 --- cb Cistern has still not reached overflow. It is approximately 24" below overflow. At the intersection of the 2 crossed logs.
8756 18 Jun 2018 @ 0938 --- bbev Vigorously boiling(at times 12" high), grey, murky. 12" below rim of inner "tube", 4-4.5' below overflow.
8754 17 Jun 2018 @ 1850 --- bbev Cistern Spring is boiling vigorously, murky green and refilling, 3' below rim of inner "tube".
8745 17 Jun 2018 @ 0945 17 Jun 2018 @ 1009 cb drained with a small amount of visable water in the very bottom of the pool
8709 15 Jun 2018 @ 2055 --- cb Cistern Spring is down 6 - 8 inches from the rim.
8699 15 Jun 2018 @ 1745 --- udo Stopped overflowing. Steamboat began steam phase about 13 minutes ago.
8647 12 Jun 2018 @ 1947 --- cb 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.
8645 12 Jun 2018 @ 0900 --- cb Empty with a wisp of steam that was barely visable
8625 10 Jun 2018 @ 1120 10 Jun 2018 @ 1200 underarockphoto Cistern dropped enough to stop overflow on east channel. Resumed by 12:00.
8545 07 Jun 2018 @ 1225 --- bbev Overflowing from both sides of pool. still gently boiling.
8524 07 Jun 2018 @ 1043 --- CrisG Pool full and overflow has started to the northeastern parts of the pool. Bubbling to center of pool.
8548 07 Jun 2018 @ 0855 --- bbev 2" below overflow, gently boiling.
8505 06 Jun 2018 @ 1815 --- CrisG Filling continues. Cave on left side fully covered.
8484 06 Jun 2018 @ 1324 --- novakg Water refilling. Roiling boil. Tree is still visible. Crater is dark grey and not the yellow-green of years past. Water nearly covering the lower "caves."
8489 06 Jun 2018 @ 0948 --- CrisG Empty crater. No audible splashing or filling.
8483 06 Jun 2018 @ 0939 --- novakg Empty. No water visible from top overlook or from below.
8445 04 Jun 2018 @ 1915 --- MAB Cistern down 1 foot
8440 04 Jun 2018 @ 1306 --- novakg Cistern had dropped 3 to 4 inches. Gentle, small boiling from one vent only.
8569 04 Jun 2018 @ 1108 --- Siegmund Water now calm, and ~3cm below overflow.
8568 04 Jun 2018 @ 0959 --- Siegmund Still boiling, but ~1cm below overflow. Sinter rim showing around edge of pool like Grand on a bad Turban cycle.
8371 31 May 2018 @ 1249 --- cb 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.
8349 30 May 2018 @ 0903 30 May 2018 @ 1015 bbev Empty, steamy, no water seen at first, but can hear splashing. Saw splash from middle deck at 0907, Seeing continuous splashing at bottom of crater from middle deck at 0918. Much larger splashing from crater at 0933. Water seen at back of crater from middle deck at 0940, assume that water is rising in Cistern Spring.
8333 28 May 2018 @ 1950 --- Kathy Down @ 3 ft from overflow. Off and on bubbling. Pool would go quiet for few seconds then stronger bubbling but not strong boiling - approx 4 min cycle. Appeared to still be draining but not a marked difference between 19:04 and 19:50
8323 28 May 2018 @ 1148 --- udo About 16 inches below overflow and bubbling / doming continuously.
8322 28 May 2018 @ 0948 --- udo Has dropped about 2 more inches in the last hour.
8321 28 May 2018 @ 0852 --- udo Down about a foot.
8320 28 May 2018 @ 0631 --- udo Cistern is down about a foot and gently bubbling / doming.
8308 25 May 2018 @ 2230 25 May 2018 @ 2245 jazzknick Heavy steam billows noted from steamboat platform. Inspection showed heavy boiling to indeterminate height, flooding of areas outside crater
8283 23 May 2018 @ 1645 --- cb Cistern Spring is in overflow and is boiling in the center of the pool. No visible water from Steamboat.
8280 23 May 2018 @ 0800 23 May 2018 @ 0809 bbev 2.5-3' below overflow, boiling gently in middle of pool.
8274 22 May 2018 @ 1917 --- cb see notes on Steamboat. Cistern is filling. Water level is approximately 3ft below the steep vent within its crater. It has a vigorous boil in the center and is a grey murky color.
8276 22 May 2018 @ 1430 --- sfavor Water level barely visible from platform and boiling vigorously.
8264 22 May 2018 @ 1100 --- cb Empty. No water visible but SLIGHT steam coming from deep within the crater.
8255 21 May 2018 @ 1830 --- cb Cistern is 3 - 3.5 ft below overflow with gentle bubbling in the center of the pool.
8224 17 May 2018 @ 1108 --- bbev Overflowing, bubbling from at least two areas in center of pool.
8239 16 May 2018 @ 1700 16 May 2018 @ 2000 MAB via NPS trail cam: near brim full at 2000 (visible on cam from 1700 on)
8219 16 May 2018 @ 1400 --- Tara Cistern Spring about 2 feet below rim, water level was just where the crater widens to the edges.
8213 16 May 2018 @ 0756 --- bbev Drained, can see some water bubbling at the bottom through the steam I would guess it's starting to refill.
8209 15 May 2018 @ 0945 15 May 2018 @ 1900 MAB Cistern several feet low at 0945. Completely Empty with no water visible from either platform by 1900.
8200 15 May 2018 @ 0725 --- bbev 1.5' lower than last night's observation.
8197 14 May 2018 @ 1822 --- bbev 3' from overflow. lightly bubbling.
8180 13 May 2018 @ 1329 --- Tara Beginning to drop, about 4-5 inches (maybe a bit more) below rim and bubbling gently from center of pool with murky gray water.
8187 13 May 2018 @ 1152 --- Janet White https://instagram.com/p/BivT6n1HEAx/ - Heard many interpretations of how far down this was, so am just including a link to a photo. 8” down???
8181 13 May 2018 @ 0717 --- sfavor just below over flow
8158 11 May 2018 @ 0740 --- ypcaribou Full, overflowing, clear, blue.
8144 10 May 2018 @ 1000 --- Tom C. In overflow at 1000 and had been for some time.
8125 08 May 2018 @ 1927 --- Tara Water level just barely visible standing on the boardwalk platform and constantly boiling to 6-18 inches.
8121 08 May 2018 @ 0950 --- cb empty.
8111 07 May 2018 @ 1915 07 May 2018 @ 1940 RLJones Cistern Spring has dropped 6 inches since we last viewed it at 0900 this morning
8095 07 May 2018 @ 1113 --- udo Approx 4 feet below overflow.
8080 05 May 2018 @ 1427 --- udo At 15 hours after Steamboat start Cistern is down about 15-16 inches.
2358 15 Sep 2015 @ 1040 --- MAB Cistern continues to overflow in 4 places, first noted by staff on the 12th
1840 05 Jul 2015 @ 2027 --- JSJ Roiling pool.
1428 16 Sep 2014 @ 0000 16 Sep 2014 @ 2359 MAB Cistern completely refilled
1447 12 Sep 2014 @ 1232 --- novakg 1232 ie:  Roiling, muddy boil as it refilled after the Steamboat eruption.
7103 06 Jul 1996 @ 0815 --- research-mab 07/06/1966 Cistern – 202º 8:15a
7634 14 Jun 1984 @ 1100 --- research-mab 6-14-84 At 11:00 MDT today Cistern was drained to a depth of 3.28m 10’9” & at 1153 had a temperature of 78ºC.
7632 25 May 1984 @ 1130 --- research-mab 5-25-84 Cistern ~1130 MDT Temp=68ºC, crater empty down to vent following yesterday’s eruption of Steamboat Geyser at ~0445 MDT. The major eruption of Steamboat awakened employees in the Norris housing area at ~0500 AM who quickly threw coats over their sleep wear (pj’s etc) & came over to witness early portions of the steam phase.
7652 10 Sep 1983 @ 1800 --- research-mab 9-10-83 Cistern Spring T=87ºC Field pH 5.9 Discharge still seems just slightly down from the rate of the first 7 months of this year. Steamboat has not yet recovered in minor play from its last eruption. {not a specific time}
7680 10 Oct 1982 @ 0800 --- research-mab 10/10/82 Cistern down ~23cm turbid gray- brown due to runoff from Steamboat.
7669 11 Mar 1982 @ 0800 --- research-mab 3-11-82 Drained 231 cm from 5th Steamboat eruption of __ 3-10-82.
5322 31 Aug 1978 @ 0900 --- research-mab 08/31/1978 Cistern’s back to blue this a.m. Lots of run-off
5323 30 Aug 1978 @ 1130 --- research-mab 08/30/1978 Cistern is back up to about normal overflow. Water is clearing up too. ! Water splashing from steamboat ~ 1120! Again to 5 feet at 1500
5324 29 Aug 1978 @ 1800 --- research-mab 08/29/1978 Cistern filling rapidly – almost full and overflowing
5325 28 Aug 1978 @ 1500 --- research-mab 08/28/1978 1500 hrs. Cistern has started to refill slightly after dropping almost 2 feet or more. It was not measured Sunday, but looked like it had dropped more from Saturday. Water in Cistern is boiling at 201ºF out of the N end of pool.
5326 26 Aug 1978 @ 0910 --- research-mab 08/26/1978 The level in Cistern Spring continues to drop slowly. It is now down 21.5 inches. Water color is a murky brown with a white scum on top – 9:10 a.m. Steamboat continues to puff steam gently- no splashing.
5327 25 Aug 1978 @ 1000 --- research-mab 08/25/1978 Steamboat steam phase has about finished. Between 9:15 and 9:45 there was a considerable decrease in the forcefulness of the steam. The boardwalk this morning had ¼ inch of ice on it. Cistern Spring has only drained 18 inches. There is a good bit of scum on top of the water. When I went down to steamboat at 8 a.m. all sorts of people were out there expecting it to go off again. The rumor has circulated through the park that Steamboat will erupt each morning at 8.
5331 24 Aug 1978 @ 1800 --- research-mab 08/24/1978 Cistern hasn’t changed much since yesterday.
5329 23 Aug 1978 @ 1200 23 Aug 1978 @ 2320 research-mab 08/23/1978 Cistern 1200 (~ 8-10 splashes 20’) At 2320 Cistern spring had only dropped 16 inches. A good amount of runoff was coming from Steamboat’s channels – all from rain mist falling out of the steam cloud in 35ºF air.
5330 23 Aug 1978 @ 1000 23 Aug 1978 @ 1220 research-mab 08/23/1978 Cistern splashing 3-4 ft, 2 inches below overflow at 1000; 4 ½ in at 1100, 1 ½ – 3 ft, nearly constant at 1100. 5 inches below overflow at 1130 intermittent splashing 1 ½ -3 Temp during heavy surging 93ºC – at 1100, at 1220 while 8 inches down during long quiet periods & gentle intermittent bubbling temp was 92ºC
7664 29 Mar 1978 @ 1600 --- research-mab 03/29/1978 Cistern Spring at 1600 MST has water level down 7’6” Depth of water remaining over vent is 5’7” Shallow sinter lined pools on terraces are drained- indicating that they are very soft & porous
7662 09 Mar 1978 @ 1800 --- research-mab 03/23/1978 Thermal changes observed from 3/6-9/1978 Cistern Spring runoff shifted from west to SE side, killing new trees.
5648 21 Aug 1975 @ 1530 21 Aug 1975 @ 1630 research-mab 08/21/1975 What’s Going On? Monarch is spouting steam bubbles from its quiet side as much as it does from its active side. Cistern appears to be more violent, and Emerald has gone crazy. (Observed in Walk 6, 3:30 to 4:30)
6189 28 Sep 1973 @ 1000 --- research-mab 09/28/1973 10:00 Cistern very pretty algae has returned to it.
6182 24 Sep 1973 @ 1800 --- research-mab 09/24/1975 Yellow color returning to Cistern’s algae.
6149 16 Sep 1973 @ 1800 --- research-mab 09/16/1973 Cistern Spring Algae coloration continues to change loss of much bright yellow algae being replaced by green.
6143 14 Sep 1973 @ 1800 --- research-mab 09/14/1973 Much of the yellow algae around Cistern S has disappeared!
6040 23 Jul 1973 @ 1800 --- research-mab 07/23/1973 Cistern S murky, lot of silt in runoff temp of 204ºF
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