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
10334 21 Sep 2018 @ 1920 --- cb Cistern Spring has better overflow from this mornings observation.
10340 21 Sep 2018 @ 1714 --- udo The following comments may only be used for personal, private, non-commercial purposes by registered users of Geyser Times and may not be reproduced, rebroadcast, or paraphrased in any form on any media without my written consent. 3 to 4 foot diameter boil hits 6 to 10 inches at times. H2S odor still present.
10336 21 Sep 2018 @ 1458 --- udo The following comments may only be used for personal, private, non-commercial purposes by registered users of Geyser Times and may not be reproduced, rebroadcast, or paraphrased in any form on any media without my written consent. Cistern has a heavy roiling boil & is overflowing in all directions. Muddy pit is a few inches below overflow.
10321 21 Sep 2018 @ 0757 --- bbev Cistern is overflowing, but not as heavily as in past few SB intervals, only slightly flowing into muddy pool.
10312 20 Sep 2018 @ 1727 --- cb Cistern Spring is overflowing but not into the muddy pool. There is a 3 vent boil in the center and it's blue in color.
10307 20 Sep 2018 @ 0847 --- cb Cistern Spring pool is high and is in overflow. Color is milky blue with a mild boil.
10305 19 Sep 2018 @ 1820 --- cb Cistern Spring is approximately 2.5' below overflow and is milky blue with a 2' diameter boil.
10309 19 Sep 2018 @ 1155 --- bbev Cistern Springs up from this morning, 3-3.5" below rim of inner tube, vigorously boiling, water appears milky.
10295 19 Sep 2018 @ 0804 --- bbev Cistern Springs just refilling, grey, boiling water can just be seen from lower boardwalk, 5-6' below rim of inner "tube".
10291 18 Sep 2018 @ 1900 --- cb Cistern Spring is still empty. No sign of water. (61°) No audible bubbling sounds, no steam, nada. . .
10282 18 Sep 2018 @ 0948 --- cb Cistern Spring has drained. no water or steam visible (32°)
10268 17 Sep 2018 @ 1100 --- udo The following comments may only be used for personal, private, non-commercial purposes by registered users of Geyser Times and may not be reproduced, rebroadcast, or paraphrased in any form on any media without my written consent. Down about 1 inch below overflow.
10211 15 Sep 2018 @ 1140 --- cb Cistern Spring is overflowing with a 3' diameter boil and is a milky blue color. No water at the bridge.
10203 14 Sep 2018 @ 1334 --- bbev Cistern Springs overflowing from all sides, including into muddy pool.
10194 14 Sep 2018 @ 0944 --- cb Cistern Spring has not reached overflow yet. water level is about 6 - 8" below overflow. CS pool is very steamy this morning. (40°) I can't hear or see any boil.
10201 14 Sep 2018 @ 0800 --- bbev Cistern Springs 12-14" below overflow, light boil in middle of clear pool.
10186 13 Sep 2018 @ 1839 --- cb Cistern Spring is filling. Water level is about 5' below the inner tube. (just visible) It has a vigorous roiling boil and is a muddy gray color.
10179 13 Sep 2018 @ 1215 --- cb Cistern Spring has drained and is empty with just a thin wisp of steam
10171 12 Sep 2018 @ 1834 --- bbev Down 20-24" below overflow, clear, no bubbles at all.
10167 12 Sep 2018 @ 1209 --- bbev 8-12" below overflow. Some bubbles.
10156 11 Sep 2018 @ 1901 --- bbev Cistern was still overflowing heavily, apparently unaffected by Steamboats earlier strong minors, which has been the case in at least the past 2 eruptions.
10142 10 Sep 2018 @ 1830 --- bbev Cistern Springs continues heavy overflow, gently boiling in center of somewhat milky, blue pool.
10131 10 Sep 2018 @ 0812 --- bbev Overflowing from all sides. Reliable report is that Cistern was 4" below overflow at about 1500 yesterday.
10109 08 Sep 2018 @ 1316 --- bbev Empty with no sight or sound of water...honest.
10115 08 Sep 2018 @ 0822 --- WillBoekel Cistern Spring has completely drained WHICH IS TO BE EXPECTED AFTER SB QUITS!
10106 07 Sep 2018 @ 1935 --- bbev Cistern Springs down 14-16" below overflow, clear with occasional bubbles in center. S
10070 06 Sep 2018 @ 1715 --- novakg Cistern is crazy full, overflow and has a gentle boil.
10046 05 Sep 2018 @ 1122 --- bbev Heavy overflow in all directions
10028 04 Sep 2018 @ 1201 --- novakg Cistern is full and overflowing. No boiling yet.
10022 04 Sep 2018 @ 0905 --- cb Is in heavy overflow in all directions and the muddy pool is WAY high! To steamy to see a boil but I can hear a faint bubbling sound and can see convection waves at the edge of the pool.
10018 03 Sep 2018 @ 1800 --- MAB A walk-by so my fill level is an approximation ~ 1/3 to even 1/2 full with spouting visible over the rim seen from the lower boardwalk
9999 03 Sep 2018 @ 0917 --- cb Empty. completely drained but steamy with some audible bubbling deep down. (34 degrees this morning)
9988 02 Sep 2018 @ 1727 --- novakg Cistern is down a solid six feet.
9969 31 Aug 2018 @ 1941 --- udo Vigorously boiling 3' diameter. Muddy pit is totally full and overflowing.
9963 31 Aug 2018 @ 0724 --- bbev Cistern Springs still overflowing into muddy pool, enough that it is now overflowing into the trees in several places.
9952 30 Aug 2018 @ 1154 --- bbev Cistern Spring in strong overflow on all sides. Overflow has filled muddy pool. Lightly boiling in middle of pool.
9945 30 Aug 2018 @ 0757 --- cb Pool is high but has not reached overflow. About 6" below overflow. Color is blue and cloudy with a VERY light boil (bubble?) in the center
9934 29 Aug 2018 @ 1838 --- cb Cistern Spring is filling. Water is just visible about 3+' down the inner tube and it has a nice roiling boil.
9937 29 Aug 2018 @ 1152 --- bbev Cistern Spring water level is 5-6' below rim of inner tube. Water can just be seen boiling vigorously from boardwalk. Appears to be refilling.
9924 29 Aug 2018 @ 0855 --- cb Empty! no visible water or gurgling sounds from either deck but there is a column of steam rising from its depths.
9913 28 Aug 2018 @ 1824 --- cb Cistern Spring is down approximately 2.5' - 3' from the rim. Milky blue/green in color with NO boil or bubbles.
9916 28 Aug 2018 @ 1142 --- bbev 12-14" below overflow. Very little bubbling.
9907 28 Aug 2018 @ 0920 --- cb down 18+". calm and blue green in color.
9890 26 Aug 2018 @ 0805 --- bbev Cistern Spring in strong overflow into muddy pool and surrounding areas. Rolling boil in middle of pool.
9879 25 Aug 2018 @ 0726 --- bbev Water level 48-50" below rim of inner "tube", rolling boil. Appears to be refilling.
9860 24 Aug 2018 @ 1720 --- MAB EMPTY - water is out of sight from all views. NPS Geology reports visible water at the very bottom, estimated 4 meters down.
9857 24 Aug 2018 @ 1317 --- bbev Cistern Springs is completely drained, no sign or sound of water, entire crater is dry and white. I have not seen Cistern this quiet and dry all year, not to say that it has not looked this way in recent past.
9855 24 Aug 2018 @ 0717 --- bbev Drained down to just below inner "tube", 32-34"(?) below overflow Water is nearly clear enough to see the stick about 6" below surface. No bubbling at all.
9852 23 Aug 2018 @ 1150 23 Aug 2018 @ 1220 bbev Cistern Springs down 12 - 14" below overflow.
9829 22 Aug 2018 @ 1740 --- cb Cistern Spring has dropped approximately 12" below overflow with a very small boil near center.
9827 22 Aug 2018 @ 1530 --- Tom C. Down about 4".
9822 22 Aug 2018 @ 1300 --- udo NPS measured Steamboat water and Cistern pH both at 5 during steam phase. Perhaps 1st time measured DURING an eruption?
9809 21 Aug 2018 @ 1910 --- udo Still in overflow on all sides. 3 foot diameter boil continues. Mud pit is fuller than Sunday or Saturday or Friday or . . . Ho-hum. Yawn.
9705 13 Aug 2018 @ 1825 --- bbev Overflowing from all sides, down some from this morning. Muddy pool is full of water.
9700 13 Aug 2018 @ 1412 --- udo 3-4 foot diameter x 6-10 inch tall roiling boil with clear water overflowing in all directions. Muddy pit is wet.
9712 13 Aug 2018 @ 1122 --- Kent Pool full, very blue, boiling and overflowing. Totally beautiful
9694 12 Aug 2018 @ 1832 --- bbev Cistern Spring is boiling vigorously and overflowing, filling muddy pool on the left side. Appears clear and blue
9633 11 Aug 2018 @ 0739 --- bbev Cistern Springs clear, blue and runoff filling muddy pool near boardwalk.
9585 09 Aug 2018 @ 1158 --- bbev Overflowing on both sides of pool. Rolling boil, cloudy light blue pool.
9538 08 Aug 2018 @ 0736 --- bbev Appears to be at same level as last night, 16-18" below overflow. Continues to boil. Clear, pale green.
9524 07 Aug 2018 @ 1919 --- bbev Cistern Springs may have risen 1" since this morning, boiling more vigorously, and water appears to be clearing.
9522 07 Aug 2018 @ 1210 --- bbev Cistern Springs up maybe 2" from 27 hours ago, green, cloudy, moderate boil (refilling?).
9509 07 Aug 2018 @ 1116 --- Stephen_Gemar Water just below the log highest up on the back right slope. Can barely see the inner tube. Water is a murky olive-greenish color, with some light roiling in the center.
9491 06 Aug 2018 @ 0908 --- bbev Cistern Springs is 18-20" below overflow, down another 2-3" from last night.
9484 05 Aug 2018 @ 2030 --- bbev Cistern Springs 16-18" below overflow, down 2-3" from this morning, same bubbling in center of pool.
9475 05 Aug 2018 @ 0910 --- bbev Cistern Springs is 12-14" below overflow and clear enough to make out inner tube. Very quiet, dry small bubbles in middle of pool.
9439 03 Aug 2018 @ 1000 --- cb overflow is weak on both the back side toward bobbysock trees and toward Veteran.
9445 03 Aug 2018 @ 0743 --- bbev Water level up ever so slightly, some runoff on left side that is trickling toward the muddy pool.
9397 02 Aug 2018 @ 0804 --- udo Overflowing into all runoff channels. Decently boiling with audible blips. Too steamy to see boil.
9386 01 Aug 2018 @ 0939 --- MAB Clear - wide flat boil
9286 24 Jul 2018 @ 1940 --- cb Cistern Spring is a milky blue color and overflowing in all directions! All overflow catch basins are full.
9287 24 Jul 2018 @ 1145 --- bbev Overflowing into muddy pool by boardwalk.
9278 23 Jul 2018 @ 1905 --- Tara Full and overflowing to the south and west. Gentle boiling from one spot in center of pool. Water murky blue gray.
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.
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