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
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!
16276 26 Sep 2020 @ 1650 --- cb 6H15M into the eruption CS pool has dropped 2' below overflow. pool is calm, clear and no boil.
16262 26 Sep 2020 @ 1147 --- cb 1H 12M in CS has dropped just 1" and is no longer overflowing from the south channel. platform mostly dry
16264 26 Sep 2020 @ 0800 --- DanS Reported that Cistern was higher this AM prior to SB eruption.
16254 25 Sep 2020 @ 0830 25 Sep 2020 @ 1745 cb Cistern Spring is still VERY low and overflowing only out of the established channel to the south. The scalloped edges and biscuits are WAY exposed. (1.5") Very chilly and windy day.
16248 24 Sep 2020 @ 0730 24 Sep 2020 @ 1900 cb Cistern Spring water level is very low. It is only overflowing from the established channels to the south and on the backside. Most of the platform is dry where is is normally wet with overflow. Scalloped edges and biscuits around the edge of the pool are exposed. hum....
16191 19 Sep 2020 @ 0915 --- cb 2D21.5H PE. Cistern Spring is overflowing to the south, backside and into the muddy pool but not toward Veteran. (looks to be in early overflow.)
16115 13 Sep 2020 @ 1800 --- cb Cistern Spring is the same as this morning.
16088 12 Sep 2020 @ 1125 --- cb 2D20.5H PE. Cistern Spring is in overflow on all sides with a moderate boil.
16052 11 Sep 2020 @ 0850 --- cb 1D17H PE. Cistern Spring is rising. Just starting to refill. water level still WAY down in the tube. Not visable because of steam and water depth so far down in the tube but I can hear the boil.
16045 06 Sep 2020 @ 0721 08 Sep 2020 @ 2121 underarockphoto With the exception of 17:30 Monday to 11:30 Tuesday. Cistern was generally calm with a lgith boil. Overflow on Sunday morning was heavy on three sides, dropping to just one overflow (back channel) point in the afternoon. Cistern slowly rose back to heavier overflow on two sides with slightly increased boiling Monday morning and dropped again (about a half inch) Tuesday through the afternoon while boiling stayed generally high.
15987 05 Sep 2020 @ 1914 --- cb 3D22h40M PE. Cistern Spring is overflowing on all sides with a weak (flooded) boil.
15962 04 Sep 2020 @ 1934 --- cb 2D23H PE. Cistern Spring is overflowing on all sides.
15943 03 Sep 2020 @ 1834 --- cb 1D22H PE. Cistern Spring is filling and the water level ~1.5' below the inner tube rim. It has a 1 point blue-ping :) (blooping) boil!
15897 30 Aug 2020 @ 1025 --- cb 3D16.5H PE. Cistern Spring is overflowing on all sides with a vigorous boil. It is an opalescent turquoise blue color.
15796 29 Aug 2020 @ 1336 --- cb 2D19H PE. CS is overflowing on the south end (toward Echinis) and over the backside. Just BARELY a trickle over NW side (toward Veteran). Pool is clear blue in color with a moderate boil.
15765 28 Aug 2020 @ 1136 --- cb 1D18H PE. Cistern Spring is on the rise. water level is not visable yet, (~9' below the rim of the inner tube.) It is very steamy and has an audible roiling, vigorous boil that is putting up an impressive steam cloud.
15684 22 Aug 2020 @ 1555 --- cb 2D13H PE. Cistern Spring is in overflow with a weak boil
15661 20 Aug 2020 @ 1731 --- cb 14H 32M PE. Spring's pool is down ~1.5' from the rim of the inner tube. The pool is calm and a opalescent steel blue color.
15631 17 Aug 2020 @ 1933 --- cb 3D4H PE. Cistern Spring is overflowing in all directions with a vigorous boil
15613 16 Aug 2020 @ 1856 --- cb 2D 3.5H PE. Cistern Spring is in overflow with average boil and it is a cloudy turquoise color.
15614 16 Aug 2020 @ 0840 --- cb 1D17H PE. Cistern Spring is refilling and the pool is ~1' below the inner tube rim. It has a vigorous boil.
15349 03 Aug 2020 @ 1200 --- Tara Down 1-2", mostly clear and calm.
15350 03 Aug 2020 @ 1114 --- Tara Down 1/2", 18"-wide boil in center of pool.
15140 01 Aug 2020 @ 1837 --- cb 2D17H PE. Cistern Spring is in overflow on all sides with a mediocre boil. It is a opalescent, cloudy, turquoise color
15101 25 Jul 2020 @ 1301 --- cb 1D PE. Drained (pool empty). No water, no sounds, no steam.
15095 24 Jul 2020 @ 1852 --- cb 5H 50M in the eruption. Cistern Spring has dropped ~2' below overflow. pool is clear and calm.
15091 21 Jul 2020 @ 0810 --- cb Cistern Spring is in overflow. To steamy to see the pool.
15054 20 Jul 2020 @ 1620 --- Yates Water is rising and visible
15053 20 Jul 2020 @ 1205 --- Yates Completely drained, no visible water.
15045 20 Jul 2020 @ 0755 --- bbev 20hrs PSBE; Drained to 6' below rim of inner tube, ledge in cave still under water. No signs of any boil at this point, light steam.
15042 19 Jul 2020 @ 1850 --- cb 7H into the eruption. Cistern Spring's pool has dropped ~2.5' below overflow. Pool is clear and mostly calm with the exception of 1 point of small ping pong ball sized bubbles that occasionally break the surface.
15010 16 Jul 2020 @ 2010 --- cb 3D PE. Cistern Spring's pool is high and in overflow with a very vigorous, blooping boil.
14978 14 Jul 2020 @ 0947 --- cb 13.5 H PE. Cistern Spring water level has dropped ~1' below the inner tube rim. Pool is a opalescent blue color and calm.
14960 12 Jul 2020 @ 0752 --- bbev 2D,21hrs PSBE; CS is high, water level over scalloped edges.
14945 11 Jul 2020 @ 0924 --- cb 1D 22.5H PE. Cistern Spring is in overflow in all directions.
14943 10 Jul 2020 @ 2108 10 Jul 2020 @ 2125 Ben VL 1D 10H 21M in. Cistern a couple inches below the rim of the inner tube. By 2125 when we walked by again it was a couple inches above the rim of the inner tube.
14930 10 Jul 2020 @ 1901 --- cb 1D 8H PE. Cistern Spring ~ 1.5' below the rim of the inner tube with a vigorous boil.
14922 10 Jul 2020 @ 1200 --- bbev 1D, 1hr PSBE; CS appears mostly drained. Water barely visible from lower boardwalk. No steam no sound. What water that is visible appears clear, light blue.
14898 06 Jul 2020 @ 1930 --- cb 3D 5H PE. Cistern Spring pool is high and overflowing in all directions. It has a vigorous blupping boil.
14891 05 Jul 2020 @ 1815 --- cb 2D 4H PE. Cistern Spring's pool is high, over the scalloped edges, and is overflowing on all sides. It has a vigorous boil and the water is clear and blue.
14883 05 Jul 2020 @ 0750 --- bbev 1D, 17.5 hrs PSBE; CS in overflow, barely covering scalloped edges, and trickling into muddy pool.
14878 04 Jul 2020 @ 1830 --- bbev 1D, 4hrs PSBE; Cistern refilling. 4.5 - 5' below inner tube. Steamy, light boil in opalescent, azure pool.
14876 04 Jul 2020 @ 1237 --- bbev 22.5 hrs PSBE: water barely visable with 6" bathtub ring. 6.5' below rim of inner tube, holes in cave exposed.
14870 04 Jul 2020 @ 1006 --- cb 19H 50M PE. Cistern Spring's pool has dropped about 5' - 6' below the inner tube rim. It has a 6" bathtub ring above the water level. Water is just at the entrance to "the cave" on the south side. color is a milky blue. The trough is mostly clear of debris. The channel is half full (empty) of small rocks.
14849 02 Jul 2020 @ 0803 --- bbev 3D, 6hrs PSBE; Pool is high, lapping over scalloped edges, with light dribble into muddy pool. Moderate boil.
14844 01 Jul 2020 @ 1915 --- cb 2D 18.5H PE. Cistern Spring is much like last night. In overflow with a average 2 point boil
14817 30 Jun 2020 @ 1943 --- cb 1D 18.5H PE. Cistern Spring is in overflow, scalloped edges are just barely covered and it has a weak boil. Pool is an opalescent blue color.
14794 29 Jun 2020 @ 1900 --- User34 17.5H P.E. Cistern about 1 1/2 feet below inner rim. Calm and beautiful opaque blue.
14772 29 Jun 2020 @ 1040 --- cb 9H PE. Cistern Spring has dropped ~2.5' below overflow. pool is calm and clear
14727 25 Jun 2020 @ 0838 --- cb Cistern Spring is in overflow. It is to steamy to see what the boil looks like.
14718 23 Jun 2020 @ 2020 23 Jun 2020 @ 2055 Ben VL 8H 38M in. About 2' below overflow.
14716 23 Jun 2020 @ 2040 --- cb 8H 45M PE. Cistern has dropped about 2' below overflow. pool is calm, no boil.
14705 21 Jun 2020 @ 0920 --- JeffL Cistern in overflow, too steamy to see boil
14702 21 Jun 2020 @ 0758 --- bbev 2D,14hrs post SB: high and overflowing, light boil in opalescent pool.
14689 20 Jun 2020 @ 0950 --- Ben VL 1D 16H 22M in. Cistern is full and in overflow with a gentile boil. Pool is a milky light blue.
14688 20 Jun 2020 @ 0758 --- bbev 1D, 14.5 hrs post SB: CS is just 1-2" below overflow. Clear pool, very steamy and difficult to see any boil, no waves or sound.
14685 19 Jun 2020 @ 2108 --- Ben VL 1D 3H 40M in. Water level a couple feet below the top of the cave, still slightly exposing a couple of rocks in the southeast corner of the cave.
14682 19 Jun 2020 @ 1731 --- cb Cistern Spring has completely drained. No water or steam visible.
14677 19 Jun 2020 @ 1054 --- cb 17.5 H PE. Cistern Spring is ~ 2' below the rim of the inner tube and has a 3" wet bathtub ring above the water level. It has a few random ping pong ball/tennis ball sized bubbles that are breaking the surface of the pool in the center and on the side closest to the bw.
14652 16 Jun 2020 @ 1925 --- cb Cistern Spring has an increase in its activity. It has VIGOROUS boil with big blooping/roiling boils.
14648 15 Jun 2020 @ 1840 --- cb Cistern Spring is the same as this morning; high and in overflow.
14645 15 Jun 2020 @ 0931 --- cb 2D 10.5H post eruptive. Cistern Spring is overflowing with a nice boil (better than last night) and the pool is high.
14642 14 Jun 2020 @ 1915 --- cb 1D 20.5H post eruptive. Cistern Spring is in overflow, the pool is high (water level is just covering the scalloped edges.) It is a milky, opalescent blue and has a very weak boil. At the trough, debris from the last eruption has been pushed into the channel directly in front of the foot bridge and the standing water is clear.
14636 14 Jun 2020 @ 0900 14 Jun 2020 @ 0930 cb Cistern Spring water level is ~2.5' below overflow. Water is a opalescent blue, it is steaming with a weak 1 point.
14632 13 Jun 2020 @ 1810 --- cb 19.5H post eruptive. The water level in Cistern is ~3' down from the rim of the inner tube. It has a wet water, "bath tub ring", 3 - 4" wide above the water level. It is cloudy blue in color and is very lightly steaming on the North west edge of the pool. There is an occational bubble that breaks the surface and pops.
14626 13 Jun 2020 @ 0615 --- cb 7.5 H into the eruption Cistern Spring is down 2' below overflow. It is calm and clear.
14615 12 Jun 2020 @ 0617 --- ypcaribou Cistern overflowing but not much over right side deposit terraces. Was trickling onto the pools in the terraces but vertical edges not getting much runoff. At 0920-ish, observed no rippling of water into the "muddy pool" at left front. Some overflow on that side, but no rippling seen in the catch pool.
14591 11 Jun 2020 @ 0757 --- cb Cistern Spring's pool is very high and overflowing in all directions
14573 09 Jun 2020 @ 0954 --- bbev 16hrs post SB eruption; CS is low, 3' below rim of "tune", no steam, no boil. water level 3" below wet line on sides of tube, and just above the cave on south side.
14552 05 Jun 2020 @ 1955 --- cb Cistern Spring is overflowing in all directions. The pool is high and just barely lapping over the scalloped edges around its rim. (Not as full as the last interval) Color is turquoise, clear, with a mediocre 2 point boil.
14548 05 Jun 2020 @ 0752 --- bbev 1D, 16hrs post SB eruption: CS is high and overflowing in all directions. Lite boil in center of opalescent pool.
14539 04 Jun 2020 @ 1830 --- cb Cisterns pool is at about the same place it was in my earlier post. 2.5 - 3' below the inner tube rim, BUT this afternoon there is a moderate boil with steam. SB is quiet.
14532 04 Jun 2020 @ 1100 --- cb Cistern is down ~ 3' from the rim of the inner tube with no boil, steam or even slight convection. There is a 3" wet water ring along the sides, above the water level, which indicates to this observer that Cistern is in a slow drain. The pool is milky turquoise in color.
14528 03 Jun 2020 @ 1740 --- cb 1H 48M post eruptive Cistern's pool is below overflow. Since SB start it has dropped ~6". No boil but a few occasional bubbles.
14523 03 Jun 2020 @ 1021 --- cb 1020 the pool is still VERY high with copious overflow on all sides. Scalloped edges are submerged under a few inches of water. Catch basins are still white with no colored bacterial mats accumulated. Typical 2 point boil. pools color is turquoise
14509 02 Jun 2020 @ 1822 --- cb Cistern Springs pool is VERY high. The scalloped edges all along the ridge are submerged under water. Copious overflow and catch basins are stark white.
14489 02 Jun 2020 @ 0732 --- bbev 2D, 1hr post SB eruption: pool is full and overflowing as expected with gentle boil. Heavy runoff to the NW, well into the trees. Also good runoff into muddy pool and channel to the south.
14486 01 Jun 2020 @ 2008 --- hurleyintjl 3 feet below overflow
14476 01 Jun 2020 @ 1817 --- cb Cistern spring is approximately 1' below the inner tube with a moderate boil. photo taken.
14244 26 May 2020 @ 2255 --- Janet Jones Overflowing nicely - quite blue.
14128 21 Feb 2020 @ 1030 --- bburrus Already drained about 6-12"
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