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
10687 29 Oct 2018 @ 1449 --- udo too steamy to see vent. very quiet but overflowing in all directions
10623 19 Oct 2018 @ 1243 --- MAB good overflow in all directions - including into the muddy pool. Two point moderate boil
10618 18 Oct 2018 @ 1330 --- MAB Steamy photos taken this afternoon sent to me show Cistern barely spilling over in two spots - south and west. Ridges on east shelf still visible. Couldn't see the center to report boil. Muddy area to NE dry.
10612 15 Oct 2018 @ 1550 --- Suzanne No longer in overflow, slight boiling, water level just below the rim.
10604 13 Oct 2018 @ 0830 --- Suzanne overflowing with small boil in center
10594 08 Oct 2018 @ 1700 --- Tom C. Down about 1'. Flat & calm.
10557 04 Oct 2018 @ 1302 --- bbev Overflowing into muddy pool.
10538 03 Oct 2018 @ 1250 --- cb Not at overflow level. 12+" Below overflow and is a muddy, greenish color with a 2 vent boil.
10531 02 Oct 2018 @ 1744 --- bbev Just barely able to see water in bottom of pool, regular splashing visible. Pool is speckled white/brown from SB runoff.
10530 02 Oct 2018 @ 1255 --- bbev No water visible in CS but can hear boiling deep in pool.
10521 01 Oct 2018 @ 1925 --- bbev Cistern drained, no sight or sound of any water.
10514 01 Oct 2018 @ 1025 --- bbev Cistern drained to 4-6" below rim of inner tube. Water is cloudy, possibly due to heavy SB runoff that was flowing into it last night.
10481 27 Sep 2018 @ 0944 --- cb Cistern Spring is in overflow with a trickle into the muddy pool
10473 26 Sep 2018 @ 1835 --- bbev Cistern Springs is 4-6" below rim of inner tube, maybe 4.5-5' below overflow.
10470 26 Sep 2018 @ 1150 --- bbev Cistern Spring is at a roiling boil 5-5.5' below rim of inner tube.
10449 25 Sep 2018 @ 1825 --- cb Cistern Spring has no visible water but I can hear a boil and splashing deep in the crater. a bit steamy too.
10446 25 Sep 2018 @ 1204 --- bbev Empty and quiet, no sound or sight of water, very little steam.
10429 25 Sep 2018 @ 1010 --- cb Cistern is empty with a small amount of steam coming from deep within the crater. (water not visible)
10334 21 Sep 2018 @ 1920 --- cb Cistern Spring has better overflow from this mornings observation.
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°)
10368 17 Sep 2018 @ 1226 --- Siegmund ~5cm below overflow, calm.
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.
10367 17 Sep 2018 @ 1013 17 Sep 2018 @ 1025 Siegmund Still overflowing (barely)
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.
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