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
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.
13548 04 Sep 2019 @ 2007 --- CrisG Cave fully covered. Water maybe 2 ft below the inner rim with a very nice rolling 2 point boil.
13547 04 Sep 2019 @ 1532 --- CrisG Cave about 1/2 full with vigorous boiling.
13538 04 Sep 2019 @ 0754 --- bbev 1D, 5hrs post SB: Cistern empty, light steam, no sight or sound of water.
13527 03 Sep 2019 @ 1615 --- cb Cistern Spring is down 2.5' from the inner tube rim, calm and deep blue in color.
13508 03 Sep 2019 @ 0801 --- bbev 5hrs, 20min post SB: Cistern down 16-18" below overflow.
13602 02 Sep 2019 @ 1652 --- Polly Cistern is overflowing in all directions. It is bubbling in the center.
13487 01 Sep 2019 @ 0820 --- cb Cistern Spring pool is high with good overflow and a 2 point boil.
13472 31 Aug 2019 @ 0817 --- cb 3D 21 H post eruptive. Cistern Spring is still high, overflowing in all directions, with a mediocre boil.
13469 30 Aug 2019 @ 1645 --- cb Cistern Spring is in copious overflow out all sides + the pool in between the boardwalk and CS. It has a mediocre boil.
13461 30 Aug 2019 @ 0811 --- bbev 2D, 21hrs post SB: Overflowing in all directions from opalescent pool, very light boil.
13450 29 Aug 2019 @ 1300 --- bbev 2D, 2hrs post SB: Cistern is 11-13" below overflow.
13445 29 Aug 2019 @ 0755 --- bbev 1D, 21hrs post SB: 12" below rim of inner tube, which makes it 40-48" below overflow. Quiet boil in clear, steamy pool
13443 28 Aug 2019 @ 1742 --- bbev 1D 7hrs post SB: no sight, no sound of water, liquid or vapor.
13435 28 Aug 2019 @ 0803 --- cb 21H 20m post eruptive. empty, no steam, no water, no sounds.
13428 27 Aug 2019 @ 1200 --- cb @ 1200 Cistern Spring dropped a few inches, is blue and clear and still has a 2 point point boil! * 1600 Cistern Spring is down 2', clear and no boil.
13384 25 Aug 2019 @ 0752 --- ypcaribou Not overflowing into muddy pool. Full and clear blue.
13374 24 Aug 2019 @ 0743 24 Aug 2019 @ 0817 cb 3D 19.5H post eruptive. Cistern Spring pool is high, clear and in good overflow. (trickle of water into the muddy pool)
13359 23 Aug 2019 @ 0827 --- CraigC full and quiet, occasional light boiling observed, slight overflow
13351 21 Aug 2019 @ 1740 --- bbev 1D,5hrs post SB: No sight or sound of water, no steam.
13307 18 Aug 2019 @ 0710 --- bbev 5D, 9.5 hrs: Cistern is very high, overflowing into muddy pool.
13300 17 Aug 2019 @ 1654 --- cb 4D18.5H post eruptive. Cistern Spring is a cloudy, milky, opalescent blue pool. The pool is high & in good overflow with a moderate boil.
13288 16 Aug 2019 @ 1754 --- cb 3D19H post eruptive. Cistern Spring pool is high and in good overflow with a moderate boil.
13280 16 Aug 2019 @ 0759 --- bbev 3D, 9.5 hrs post SB: Cistern overflowing from clear, blue pool, gentle boil.
13270 15 Aug 2019 @ 1730 --- bbev Overflowing in all directions.
13264 15 Aug 2019 @ 0756 --- bbev 2D, 9.5hrs post SB: 24-28" below overflow! Moderate 2 point boil in clear pool.
13258 14 Aug 2019 @ 1644 --- cb 1D 18.5H post eruptive. It is on the fill. Just the tips of the water splashes can be seen from right in front on boardwalk. audible vigorous boil and lots of steam. visitor just called CS a "looser puddle, not worthy of a National Park". oh the things i hear!
13228 14 Aug 2019 @ 0757 --- bbev 1D, 9.5hrs post SB: Completely drained. Light steam, no sound or sight of water.
13219 13 Aug 2019 @ 1708 --- cb 18.5 H post eruptive. crater is empty, no water, no steam, no sounds
13217 13 Aug 2019 @ 1130 --- cb Cistern Spring is 2' below the rim of the inner tube. it is very clear, calm and a beautiful deep blue color!
13214 13 Aug 2019 @ 0804 --- bbev ~9.5 hrs post SB: Cistern down 24-26" below overflow.
13158 11 Aug 2019 @ 0758 --- RMichaels Overflowing with decent boil in center.
13106 08 Aug 2019 @ 0755 --- bbev 9D, 0hrs post SB: Cistern overflow improved some, trickle of water towards muddy pool.
13086 07 Aug 2019 @ 0735 --- bbev ~8D, 0hrs post SB: Cistern lightly overflowing with moderate boil. Not much change IMO.
13073 06 Aug 2019 @ 1715 --- cb Same as this morning, weak boil and in overflow.
13064 06 Aug 2019 @ 0750 --- bbev 7D, 0hrs post SB: Barely overflowing and moderate boil.
13040 05 Aug 2019 @ 0800 --- KarlH Seems to have light overflow off the back down the terraces. Light bubbling in the center. Maybe a bit milky, but I have no reference point.
13034 04 Aug 2019 @ 1918 --- bbev Steady rolling boil in mostly clear pool. Just at overflow, with barely a trickle out the SE side. West side has just filled the terrace below which is not yet overflowing.
13014 04 Aug 2019 @ 0735 --- cb 5D, Cistern Spring is ~2' below overflow and has a vigorous boil that is churning the pool.
13012 03 Aug 2019 @ 1918 --- Stephen_Gemar Cistern appears to have risen since earlier today. The water level is now approx. 1 foot below the rim of the inner tube, with a roiling boil of about 1-2’. Still a murky beige color.
13002 03 Aug 2019 @ 1720 --- cb 4D, 10hr post SB eruption: Cistern rising to ~18" below rim of inner tube. Still erupting 2' inside the tube.
12991 03 Aug 2019 @ 0801 03 Aug 2019 @ 1245 cb 4D 0H post eruptive 45°. Cistern water level is 4' below the rim of the inner tube. Still a crazy vigorous boil 2 - 3' in height. Very steamy. light brown/beige in color. ** @ 1245 CS is 2.5' below the inner tube rim. still murky beige in color and a VIGOROUS ROILING BOIL!
12960 02 Aug 2019 @ 1701 --- cb 3D 10H post eruptive. water is still 5' below the rim of the inner tube. water is a beige color and it has one of the most vigorous boils I've seen! Some bursts 4' high!
12956 02 Aug 2019 @ 1148 --- cb water & boil just visable. 6' down inner tube.
12949 02 Aug 2019 @ 0754 --- bbev 3D post SB: Just able to see vigorous boil, 5-6' below rim of inner tube. Water appears grey and milky. Overall, ~10' below overflow.
12929 01 Aug 2019 @ 1739 --- bbev 2D, 10 hrs: Completely empty, no sound, no steam no water.
12920 01 Aug 2019 @ 1010 --- cb 2D2H post eruption. empty. no sounds, steam.
12886 31 Jul 2019 @ 0750 --- cb Cistern Spring pool has no visable water in it. no water, steam or sounds! (surprising with how cold and foggy the basin is this morning)
12876 30 Jul 2019 @ 1645 --- cb Cistern Spring is down 4'. (to the end of the crossed logs on the west end of the pool)
12807 26 Jul 2019 @ 1000 --- cb 2D 18H. just reached overflow. channels on both sides just starting to flow into catch basins. weak boil.
12802 26 Jul 2019 @ 0754 --- bbev 2D, 6hrs post SB: Cistern is 8-10" below overflow, clear, steamy.
12796 25 Jul 2019 @ 1637 --- cb water just barely visible. down 6 - 8' from inner tube. has a vigorous boil!
12814 25 Jul 2019 @ 1100 --- Scott H Completely drained and quiet. Light steam.
12547 20 Jul 2019 @ 1348 --- cb 2D 14H post eruption. in overflow with a 2 point boil.
12536 20 Jul 2019 @ 0808 --- bbev 2D, 2hrs post SB: 18-20" below overflow, very steamy, clear, 2 point boil.
12529 19 Jul 2019 @ 1653 --- cb water is barely visable from the boardwalk directly in front of Cistern Spring IF i stand on tiptoes I can see splashing from a vigorous boil 6+' down the inner tube along the SW wall. I can clearly hear the refill boil and it is VERY steamy.
12523 19 Jul 2019 @ 1025 --- cb Cistern Spring is empty and dry. no steam & no sounds.
12518 18 Jul 2019 @ 1430 --- cb pool has dropped 3' below overflow
12465 13 Jul 2019 @ 0800 --- bbev ~2D, 13 hrs post SB: overflowing on west side, east side dry. light boil.
12451 12 Jul 2019 @ 1727 --- bbev ~1D, 22hrs post SB: Vigorously boiling, opalescent, 3' below rim of inner tube.
12448 12 Jul 2019 @ 0802 --- bbev 1D, 13hrs post SB: Can hear water returning, splashing barely seen from lower boardwalk.
12440 11 Jul 2019 @ 1600 --- cb Cistern empty, no steam or sounds.
12435 11 Jul 2019 @ 0803 --- bbev ~13 H post SB eruption: Cistern down 32-36" into "tube" with 2" ring of moisture above water line. No steam, no boil.
12395 07 Jul 2019 @ 0926 --- cb Is very steamy, in overflow with a 2 point boil.
12428 01 Jul 2019 @ 2035 --- Ben VL 2d 20h 51m in. Overflowing into the muddy pool. Boiling enough to agitate the entire surface.
12427 01 Jul 2019 @ 0745 --- Ben VL 2d 8h 1m in. Full and overflowing with a boil in the center.
12426 30 Jun 2019 @ 2020 --- Ben VL 1d 20h 36m in. About 1' below overflow, with a boil in the center. Rose about 1" in the following 20 or 30 minutes. Milky blue in color.
12035 29 Jun 2019 @ 0808 29 Jun 2019 @ 1500 cb Cistern Spring has dropped 2' from overflow @ 0800. ** @ 1214 Cistern Spring has dropped to 1' below the inner tube and is a beautiful turquoise blue color. **1500 Cistern Spring water level is down 3' from the rim of the inner tube and it has some bubbles (not boil) breaking the surface of the water and causing convection waves.
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