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
22113 25 Jun 2022 @ 1103 --- cb CS is in copious overflow on all sides with a 6" vigorous blooping boil.
22105 24 Jun 2022 @ 0804 --- bbev CS in copious overflow in all directions with strong, 6" blooping boil.
22093 23 Jun 2022 @ 1827 --- cb overflowing in all directions. clear with moderate boil
22097 23 Jun 2022 @ 0802 --- bbev CS appears to have recently began overflow to the north, towards Veteran, upper catch basins filling. Overflowing out back channel with trickle into muddy pool.
22065 22 Jun 2022 @ 1329 --- cb CS water is just within sight down in the inner tube. ~6' from inner tube rim (at the base of the cave). Vigorous boil. refilling. ** @ 2025 2D5H Cistern Spring is ~1' below the inner tube rim. it has a vigorous boil and water is clear blue.
21980 13 Jun 2022 @ 2000 --- Dan A 3D8.5H PE cistern is overflowing in all directions with a nice big boil
21947 12 Jun 2022 @ 0956 --- cb D22.5H. 48° raining steadily. Cistern Spring is empty. A father put his young son on his shoulders to see if there was any visable water. No visable water in the vent according to this smart young lad!
21916 11 Jun 2022 @ 0849 --- cb water is ~5' below the inner tube rim, or just at the "cave" in the tube. color is blueish green.
21905 10 Jun 2022 @ 1315 --- novakg Cistern was out of overflow, but had not dropped much
21788 06 Jun 2022 @ 1130 --- cb moderate boil, water level just a hair below the scalloped overflow rim & only overflowing out the established channel.
21635 01 Jun 2022 @ 1400 --- cb CS is only overflowing out the established channel toward Echinus. water is clear and has a moderate boil
21540 27 May 2022 @ 1841 --- cb pool is high & overflowing into the muddy pool & out the established channel to the south and MAYBE some is dribbling out the backside toward Tantalus via wind pushed waves. Nothing out of the side toward Veteran or the boardwalk. It has a weak boil. water is clear & blue.
21515 26 May 2022 @ 1413 --- cb 3D5.5H PE. 1' BELOW the inner rim with a vigorous 2 point boil
21476 25 May 2022 @ 0925 --- TSBryan empty
21468 24 May 2022 @ 1904 --- cb Cistern Spring has drained. no water or steam observed
21436 23 May 2022 @ 1636 --- cb 8HR IE. down ~2' calm clear and blue
21435 23 May 2022 @ 1247 --- cb 4H into eruption, CS has dropped ~1' below overflow & is calm, clear and blue
21395 20 May 2022 @ 2105 --- ypcaribou Per SB post: CS is only flowing out the back channel that I can tell.
21348 17 May 2022 @ 0800 17 May 2022 @ 2000 ypcaribou Per SB entry: Cistern Spring overflowing out the established back channel only with a moderate boil.
21326 16 May 2022 @ 1350 --- Tara Overflowing out the back channel, blooping boil in center of pool.
21277 14 May 2022 @ 1200 --- cb Cistern Spring is only overflowing out the established channel on the south end of its pool. (toward Echinus) It has a weak boil.
21244 11 May 2022 @ 0900 --- MAB overflowing every which way
21213 07 May 2022 @ 1415 --- cb CS is filling. Water is ~4 - 5' below the rim of the inner tube. (right at the "cave" in the inner tube.) It has a substantial boil. It was difficult to see with my 1 good eye and through the snow squall & steam. I just waited for the wind direction to change and got a good view.
21199 06 May 2022 @ 1430 --- MAB empty per maramom
21175 05 May 2022 @ 1144 --- cb pool is empty, no visable water or steam
21166 04 May 2022 @ 1419 --- bbev 10hrs PSBE: pool is down 3', cloudy, no boil.
21139 30 Apr 2022 @ 1430 --- bbev Cistern low, with only light runoff out back channel. All areas around spring are dry with water level ~1/2" below rim. Pool is clear with moderate boil.
21068 24 Apr 2022 @ 1307 --- DanS Overflowing only through back channel
21056 23 Apr 2022 @ 1304 --- DanS Below overflow for all but far runoff channel.
21005 18 Apr 2022 @ 1820 --- MAB Clear blue w a 2 pt boil- not in overflow except the deep channel that points towards Echinus - zero on west terraces
20949 06 Apr 2022 @ 1120 --- SteveO Overflowing and light boil in the center.
20270 03 Nov 2021 @ 0915 --- cb In copious overflow in all directions! With a vigorous boil. muddy pool is very full and now has 2 outflow channels toward Echinus @ 1700 it is still the same, in crazy overflow!
20267 03 Nov 2021 @ 0211 --- Tsunami *sighs* First off Park Rangers said I could be in the basin. Anyways, was noticeably down.
20233 30 Oct 2021 @ 1200 --- bbev CS has been in heavy overflow for past two days, more water in every direction than l remember ever seeing, other than possibly during the last interval. There is a new,, bright green channel flowing into the "muddy pool" from Cistern. The muddy pool is no longer muddy, but clear and growing green algae on the bottom, and is establishing a new runoff, closer to the boardwalk and steerage.
20144 27 Oct 2021 @ 1224 --- cb in overflow on all sides with a very, hardly noticeable, boil. boil is not audible either. Pool is a milky, opalescent blue color
20122 25 Oct 2021 @ 1247 --- cb CISTERN SPRING @ 1247 has dropped 3' below overflow (water level is right at the intersection of the crossed logs. No boil, clear & blue.
20072 21 Oct 2021 @ 1349 --- mwolf clear, blue, boilin, overflowin
20060 19 Oct 2021 @ 1504 --- cb In copious overflow in all directions with a vigorous boil. Muddy pool is full & overflowing.
20022 17 Oct 2021 @ 1635 --- MAB steamy but clear blue - overflowing every which way
20003 16 Oct 2021 @ 1717 --- cb 3D4.5H PE.. Cistern Spring is just barely in overflow out the established channel toward Echinus & off the backside into the bobbysock trees. not yet overflowing toward Veteran. Pool is deep blue with a weak boil.
19996 16 Oct 2021 @ 1136 --- cb CISTERN SPRING is ~1.5' below overflow with a nice boil and clear pool.
19981 15 Oct 2021 @ 1250 --- cb CISTERN SPRING is down 2' below the inner tube rim. no boil. no steam. Water is a still, beautiful blue color. (still draining).
19935 07 Oct 2021 @ 1750 --- cb CISTERN SPRING is still in overflow.
19892 05 Oct 2021 @ 1832 --- cb 7D5H.. CISTERN SPRING Is still in overflow with a VERY vigorous goil
19882 04 Oct 2021 @ 0900 --- cb CISTERN SPRING is still in COPIOUS overflow in all directions.
19829 01 Oct 2021 @ 1459 --- bbev 3D,1hr PSBE: Overflowing in all directions with moderate boiling, clear blue pool.
19818 30 Sep 2021 @ 1757 --- cb water level is 5' below the inner rim and rising with a fairly vigorous boil. color is milky blue.
19805 30 Sep 2021 @ 1153 --- cb 1D 22H PE. 1153 CISTERN SPRING is filling, water level way down in the vent and just barely visible at this time. ( below the 2 "holes" on the east side) Audible churning with a lot of steam.
19780 29 Sep 2021 @ 0900 --- cb 19.5 Hours PE. CISTERN SPRING is completely drained with no visible water & barely steaming. Vent & bottom was easily visible on this chilly morning.
19749 26 Sep 2021 @ 1600 --- cb throughout the day Cistern was in copious overflow in all directions with a good, broad roiling boil.
19578 15 Sep 2021 @ 0858 --- cb CISTERN SPRING water is ~ 1' below the rim of the inner tube and has a audible boil. To steamy to accurately view.
19558 14 Sep 2021 @ 0941 --- cb 3D3H .. Cistern spring is filling. No visable water yet but it has a VERY audible roiling boil with heavy steam.
19527 13 Sep 2021 @ 1019 --- cb CISTERN SPRING @1019 has no visable water or audible sounds but has a fair amount of steam coming from deep down in its vent.
18741 30 Jul 2021 @ 0555 --- ypcaribou Just below overflow. Right shoulder dry. Muddy Pool is more of a mud pit with a puddle of water in the center.
18577 22 Jul 2021 @ 0930 --- Tara Milky blue, weak boil. Water level ~1cm below rim, overflow out back and west channels
17614 09 Jun 2021 @ 1807 --- Craigmon99 Has become noticeably less opalescent and more clear in my 1.5 hours at Norris
17601 09 Jun 2021 @ 0940 --- Tara Full, milky blue, light boil.
17579 08 Jun 2021 @ 1009 --- cb pool is high with a weak boil and weak overflow to the south and a little over the backside. @ 1200 overflow has improved. A bit into the muddy pool, better flow out the established runoff channel to the south and catch basins are full and overflowing
17537 07 Jun 2021 @ 1647 --- novakg Gorgeous off blue, gently boiling and in overflow in several places. Sorry, I didn't make careful notes.
17513 06 Jun 2021 @ 0837 --- bbev 5D, 20.5 hr PSBE; CS is high and overflowing out back channel, and has yet to reach overflow to the NW terraces or into muddy pool. Light, 3 point boil in opalescent light blue pool
17478 05 Jun 2021 @ 1443 --- steve About a foot or slightly more below overflow and bubbling. Opalescent light blue color.
17473 05 Jun 2021 @ 0924 --- cb 4D22.5H PE. Water is up to the rim of the inner tube. it has a blopping boil. @1002 it's filling fast this morning! In a half hours time water has come up ~ 4" to past the rim
17444 04 Jun 2021 @ 1620 --- cb 4D 4.5H PE Cistern Spring water level has only come up a few inches since this morning observation. It is just covering (lapping over) the 2 holes inside the cave on the south side. Still has a vigorous boil.
17445 04 Jun 2021 @ 0943 --- cb 3D22H PE. Cistern spring is filling. water is at the 2 holes near the Cave about 6' from the inner rim.with a vigorous boil.
17448 04 Jun 2021 @ 0804 --- bbev 3D, 20hrs PSBE: water heard, and vigorous boiling seen, by standing on railing, deep in crater. Appears to be refilling, very steamy on warm morning.
17400 03 Jun 2021 @ 0730 --- cb Cistern spring is lightly steaming. no visible or audible signs of water in the pool.
17388 02 Jun 2021 @ 1420 --- Tara Empty and quiet, water not visible yet.
17385 02 Jun 2021 @ 0955 --- Tara Completely dry, no water visible, light steam.
17315 31 May 2021 @ 1342 --- molliepope Cistern has dropped about 2-3 inches. Small amount of bubbles reaching surface in center of pool.
17192 26 May 2021 @ 0830 --- Suzanne Full and overflowing in all directions, with a good boil.
17084 14 May 2021 @ 0930 --- cb Cistern spring pool is high and overflowing in all directions, especially out of the established runoff channel to the south.
17046 11 May 2021 @ 1120 --- cb Cistern spring is overflowing in all directions. Can't see boil through the steam.
17032 09 May 2021 @ 1146 --- bbev 4D, 12hrs PSBE, full and overflowing in all directions. Pool is clear with steady roiling boil.
17005 06 May 2021 @ 1934 --- bbev 1D, 19.5 hrs PSBE; slightly steamy which is only sight of water.
17003 06 May 2021 @ 0928 --- MAB Completely empty-very light steam for the cool morning- no sound
16924 26 Apr 2021 @ 1042 --- DanS Full overflowing all directions with 2 point boil.
16898 20 Apr 2021 @ 1810 --- MAB in overflow - variable boil w a pretty blue color. VR of overflow in midafternoon as well
16846 06 Feb 2021 @ 1430 --- Micah Kipple Water visible way down in vent. Just starting to refill(?)
16825 24 Jan 2021 @ 1509 --- markwolf 1-2 cm below rim. good boil
16791 24 Dec 2020 @ 1443 --- Micah Kipple Full. Boiling, and overflowing on all sides.
16787 23 Dec 2020 @ 1427 --- Micah Kipple Full. Overflowing with a 2 point light roiling/boil in the center.
16489 30 Oct 2020 @ 1245 --- steve Custer is boiling strong with good overflow.
16485 29 Oct 2020 @ 1752 --- MAB In overflow east and west. Too steamy to see southward
16480 29 Oct 2020 @ 0939 --- MAB 1.5 ft below the scallops. Too steamy to see but I heard bubbles breaking
16457 26 Oct 2020 @ 1217 --- markwolf still low today
16429 15 Oct 2020 @ 1130 --- markwolf still very low (not visible from boardwalk) and very little steam on this chilly day.
16409 11 Oct 2020 @ 1905 --- cb 5D22H PE. Pool has dropped a little. Water is lapping at just below the scalloped edges of the pool. Overflowing out the established runoff channel to the south and a bit out the backside. Runoff channel toward Veteran is trickling into the catch basin but not any further.
16401 10 Oct 2020 @ 1243 --- cb pool is high and covering the scalloped edges. Overflowing on all sides and filling catch basins in front of the boardwalk, to the West, flowing into the muddy pool and a heavy flow out of the established runoff channel to the south. (like a river!) It has a mediocre boil.
16366 08 Oct 2020 @ 1022 --- bbev 2D, 13hrs PSBE: 24-30" below overflow.
16362 07 Oct 2020 @ 1835 --- cb . Cistern spring is filling. Water is ~6' below the rim of the inner tube. (cave in the tube to the south) water is clear and it has a vigorous boil.
16357 07 Oct 2020 @ 0905 --- cb 1D12H PE. Cistern Spring is beginning to refill.
16353 06 Oct 2020 @ 1018 06 Oct 2020 @ 1610 cb @ 1018 (13H15M) into the eruption. Cistern Spring is down ~1.5' below the inner tube rim. It is calm, steamy and blue! @1149 Cistern Spring is down 2' from rim of inner tube. @1551 (19 H) Cistern Spring is empty of all visable water.
16335 05 Oct 2020 @ 0815 05 Oct 2020 @ 1915 cb 9D9H PE. Cistern Spring is overflowing to the south and backside with a vigorous blooping boil.
16325 03 Oct 2020 @ 0930 03 Oct 2020 @ 1930 cb 7D9H PE. Cistern spring is low again like last interval. Only overflowing out the established channel toward the south. It has a very vigorous blooping boil 3 - 5".
16318 02 Oct 2020 @ 0930 --- cb 5D23H PE. Cistern Spring is overflowing out the established runoff to the south, minimally out the back side and to the west.
16309 29 Sep 2020 @ 1835 --- cb 3D8H PE. Cistern Spring is barely overflowing on the south, west and backside. There is a trickle of water approaching the muddy pool. It's mainly overflowing out the established channel to the south. It has a mediocre boil.
16297 28 Sep 2020 @ 1418 --- bbev Heavy boil now just visible from boardwalk in front of spring, 5-6' below rim of inner tube. Up maybe 1' from 6 hours ago.
16296 28 Sep 2020 @ 0840 --- bbev 1D, 22hrs PSBE; Cistern also steamy. Can hear water and only able to see vigorous boiling by standing on middle rail in front of the spring.
16293 27 Sep 2020 @ 1855 --- Ajw Pool is completely drained. Only a faint hint of steam from crater.
16292 27 Sep 2020 @ 1605 --- cb 1D 5.5H PE. Cistern Spring has completely drained. No sounds or steam on this chilly fall day!
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