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
11258 17 May 2019 @ 1340 --- cb Cistern Spring was to steamy to see clearly but was obviously overflowing.
11248 16 May 2019 @ 1241 --- bbev Full and overflowing in all directions, mostly clear and boiling.
11244 15 May 2019 @ 0915 --- cb Cistern Spring is refilling and water level is 6'' below the rim of the inner tube. It has a 2 point vigorous boil.
11240 14 May 2019 @ 1655 --- cb Cistern Spring has drained. no visible water, no sounds and no steam (65°)
11238 14 May 2019 @ 0915 14 May 2019 @ 0930 cb Cistern Spring was down 3' from the rim of the inner tube and no boil.
11221 12 May 2019 @ 0800 --- cb Cistern Spring is in overflow with a 2 point vigorous boil.
11203 10 May 2019 @ 1020 --- bbev Cistern boiling, a little milky, and overflowing out west side, very little overflow to the east.
11192 09 May 2019 @ 1125 --- cb Cistern Spring has no visible water, no audible churning sounds and the faintest of steam.
11188 08 May 2019 @ 1105 08 May 2019 @ 1627 cb Cistern Spring is down 18" from overflow @ 1135. down 2.5' @ 1500. down 3.5' - 4' @ 1625.
11183 07 May 2019 @ 1655 --- cb Cistern Spring is barely in overflow. scalloped edges on the rim are visable. Overflow areas on all side are just moist.
11173 05 May 2019 @ 0912 --- bbev Cistern is full, clear, boiling in two areas in center of pool. Overflowing in all directions as well as lightly to the east into muddy pool.
11165 04 May 2019 @ 1600 04 May 2019 @ 1832 cb Cistern Spring is filling. water level is about 1.5' below the rim of the inner tube and has a vigorous boil. @1830 Cistern Spring has Come up 3' in 2.5 hours. filling quickly!
11156 03 May 2019 @ 1907 --- cb Cistern Spring is empty. No steam or audible water sounds.
11150 03 May 2019 @ 0745 03 May 2019 @ 1000 bbev Cistern down 20-24", clear, no bubbles, no boil, little steam. 0945, Cistern dropped 4-6" since first observed this morning. Still no boil, bubble or steam.
11140 01 May 2019 @ 2041 --- ypcaribou Full and blue with continuous roiling. Left side not in overflow to the muddy catch pool.
11231 30 Apr 2019 @ 1345 --- Polly Cistern Spring is in overflow to the right and the right back. There is also a little overflow in the left back. I can hear small boils.
11114 28 Apr 2019 @ 1150 --- cb Full, in overflow, clear turquoise blue green in color with a fairly vigorous boil
11099 27 Apr 2019 @ 0848 --- bbev Cistern lightly steaming and can barely hear water deep in the well.
11108 27 Apr 2019 @ 0750 --- ypcaribou Fully drained. Low gurgle audible deep inside. Steaming a smidge.
11089 26 Apr 2019 @ 1245 --- cb Cistern Spring is 4' below the inner tube and the pool is clear and blue. It has some gentle bubbles on the west side. @1315 Cistern Spring pool has dropped another 4".
11039 21 Apr 2019 @ 1530 --- JeffL in overflow, decent boiling in center. nice and clear
11002 19 Apr 2019 @ 0955 19 Apr 2019 @ 1025 ypcaribou Not quite in overflow. Clear blue and bubbly.
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.
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