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
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"
14117 10 Feb 2020 @ 1305 --- Micah Kipple Full. Light boil in the center to maybe 6 inches but not really breaking the surface. Fresh tan colored sinter still rapidly building new Terraces on right (west) side. Pool itself is a beautiful royal blue.
14107 31 Jan 2020 @ 1003 --- Micah Kipple Full. Weak roiling boil. Overflow on all sides. Depositing beautiful tan/cream colored sinter Terraces.
14060 31 Dec 2019 @ 1100 31 Dec 2019 @ 1230 ypcaribou Cistern in "slight overflow" (was not flowing into muddy pool). Reported to Bob Cash who told me. Time is approximate - was mid day.
14001 03 Nov 2019 @ 0852 --- MAB in overflow all directions- easy to see the snowmelt
13995 01 Nov 2019 @ 1701 --- MAB in between steam blasts water was visible with vigorous boil
13993 01 Nov 2019 @ 1025 --- MAB can hear violent boil deep in crater. when steam briefly cleared could not see water
13972 25 Oct 2019 @ 0935 --- MAB In overflow. At 15 deg too steamy to see south and east channels but NW is flowing down the formation steps w good trickling noises
13957 18 Oct 2019 @ 1003 --- MAB Slight overflow South with light steam. Southeast w visible pushes but not heavy. Northwest overflowing lightly but not down the 2nd step. By 1737 NW strongly flowing with that loud trickle noise.
13923 11 Oct 2019 @ 1315 --- underarockphoto In overflow in two directions. Light runoff. Lower than yesterday. Very light boil.
13918 10 Oct 2019 @ 1530 --- underarockphoto Overflowing. Light boil. Overflow in three directions. Runoff seems higher a tad than overflows I’m used to seeing. Specifically there’s trickling water to the northern channels and it’s going into the muddy pool to the southeast.
13917 10 Oct 2019 @ 0900 --- underarockphoto Reports cistern was “full but not overflowing this morning”
13887 05 Oct 2019 @ 1149 --- cb Cistern Spring is high and overflowing in 3 directions with a vigorous 2point boil.
13871 04 Oct 2019 @ 1300 --- underarockphoto 3D 0H. Water finally returning. Saw one spritz from North Vent. Nothing from South. No water in SV channel. Logger shows no water. Cistern is blue, clear, and overflowing with a light boil. Emerald is overflowing and clear.
13862 04 Oct 2019 @ 0756 --- bbev 2D, 19hrs post SB: Opalescent pool, overflowing with light boil heard, very steamy.
13867 03 Oct 2019 @ 1350 --- cb 2D 1H PE. water is ~5' below the inner tube rim. vigorous boil
13851 03 Oct 2019 @ 0759 --- bbev 1D, 19hrs post SB: Splashes deep in crater just visible from in front of Cistern. Plenty of steam on 13°F morning. Water in trough frozen.
13847 02 Oct 2019 @ 0800 --- bbev 19 hrs post SB: Cistern completely drained, no sight or sound of any form of H2O.
13819 27 Sep 2019 @ 1549 --- bbev 2D, 15.5hrs post SB: Just in overflow, lower terrace on west side just getting water. South and east side barely overflowing. Overflow began within past 1-2 hours IMO.
13816 27 Sep 2019 @ 1152 --- SteveO 2D, 5.5hrs post Steamboat: 12-16" below overflow. Clear and moderately boiling pool.
13810 27 Sep 2019 @ 0753 --- bbev 2D, 1.5hrs post SB: 26-30" below overflow. Clear, moderately boiling pool.
13805 26 Sep 2019 @ 1420 --- cb 1D8H PE. 54° Cistern Spring has no visible water that i can see but it does have steam coming up from down deep. No gurgling sounds.
13790 24 Sep 2019 @ 0700 24 Sep 2019 @ 1700 cb Cistern Spring on the other hand was interesting! VIGOROUSLY boiling and blooping to - 6" in 2 places. The boil is sending out large waves which by late afternoon dropped the pool level so that overflow was only only in the 3 established runoff channels and being push out the stong waves
13765 20 Sep 2019 @ 0747 --- bbev 2D, 8hrs post SB: Cistern overflowing in all directions.
13761 19 Sep 2019 @ 1648 --- cb 1D 17H PE. water is ~4' below the inner tube rim. vigorous boil and beautiful blue color
13747 19 Sep 2019 @ 0800 --- bbev 1D, 8hrs post SB: Cistern steaming, can just see water 6+' below rim of inner tube and can hear light boil.
13742 18 Sep 2019 @ 1752 --- cb 17H PE. Cistern Spring has drained. no water, no steam, no sounds. bone dry
13733 18 Sep 2019 @ 0753 --- bbev 8hrs post SB: Clear pool down 20-24" below overflow.
13726 17 Sep 2019 @ 0830 --- bbev Cistern pool is high with a good boil and in overflow.
13717 16 Sep 2019 @ 1300 --- Polly Cistern has a center boil, & it is full and overflowing in several spots (but not into the muddy pool).
13704 15 Sep 2019 @ 1755 --- cb 3D 20H PE. Cistern Spring is high. Overflowing in 4 directions including the muddy pool. nice boil. sorry for no morning report, we went on a hike.
13689 14 Sep 2019 @ 1019 --- cb 2D 12.5 H PE. Cistern Spring is in overflow in all 3 directions. (not into the muddy pool)and all its overflow catch basins are full, steamy and overflowing. The pool is milky and a brilliant blue color. Nice boil.
13681 13 Sep 2019 @ 1633 --- cb 1D 18H post eruptive. Cistern Spring is ~5' below the inner tube rim. water for this observer is just at visibility level. SB is quiet. All channels dry.
13675 13 Sep 2019 @ 0900 --- cb 1D 11.5 H post eruptive. Cistern Spring water level is down at the bottom of the inner tube. The pool is not visable yet but i can see the top of an occational splash. Audible boil. Very steamy.
13666 12 Sep 2019 @ 1723 --- cb Cistern drained. no steam, no sounds, no water.
13664 12 Sep 2019 @ 1530 --- bbev Visitors report Cistern empty, no water seen. Will confirm at 1730.
13659 12 Sep 2019 @ 0830 12 Sep 2019 @ 0840 William water level sunk below the rim of the inner tube.
13657 12 Sep 2019 @ 0751 --- bbev 10hrs post SB: 36-38" below overflow, few inches above rim of inner tube, calm and clear. "Great Wall of Cistern" needs repair.
13616 07 Sep 2019 @ 1420 --- Polly Beautiful turquoise. Pool has strong overflow to the right with a 2 point moderate boil.
13591 06 Sep 2019 @ 0806 --- bbev 3D, 5+hrs: Cistern overflowing in all directions, with light boil.
13571 05 Sep 2019 @ 0905 --- cb Cistern Spring is in overflow on 3 sides with what seems like a gentle boil. To steamy to really see but i cant hear it. Just see small convection waves.
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