| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 15695 |
23 Aug 2020 @ 0640 |
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ypcaribou |
Water level has dropped noticeably. I am not good with estimating but it is noticeably lower. And kinda.. blue. Root Pool also down maybe a foot and is milky blue. |
| 15547 |
13 Aug 2020 @ 1019 |
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cb |
both root pool and Tantalus pools are low. Root is a lime green color with an occational bubble in the north pool. Tantalus is a muddy green color with a slight boil in the center and random small bubblers scattered throughout the pool. It is barely in overflow! |
| 15657 |
03 Aug 2020 @ 1052 |
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Tara |
With Steamboat just into steam phase, Tantalus had brown-gray water with foam on it from the intake of Steamboat runoff. Its pool was at a "normal" level with several points of boiling. |
| 14951 |
10 Jul 2020 @ 1520 |
--- |
cb |
pool is very low, quiet, barely overflowing into the creek, no bubbles or boils in the pool & is a murky green/brown color. Root pool was very high, light green in color and both pools are connected by a broad water channel with a weak boil in the center of the north pool. |
| 14611 |
12 Jun 2020 @ 0903 |
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ypcaribou |
Full, almost clear blue/green on top of beige muddy edges and bottom with bubbling in several spots. Root pool milky green and maybe a foot below top rim. |
| 14525 |
03 Jun 2020 @ 1308 |
--- |
cb |
Tantalus pool is low but still flowing into the creek. The pool is slightly murky greenish in color with a few random golf ball sized bubbles breaking the surface. One small vent on the south west side of the pools edge has some constant convection waves. Root pool is low, greenish in color, the 2 pools are connected and the North pool has some occasional tennis ball to dime sized bubbles that break the surface. very calm compared to last year. |
| 14501 |
01 Jun 2020 @ 1800 |
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ypcaribou |
Full, bubbling here and there, murky greenish-gray water but not muddy. |
| 13933 |
13 Oct 2019 @ 1550 |
--- |
cb |
Root pool is mostly clear, green in color, with occasional ball sized bubbles in the north pool. Both pools are connected with the water level ~10" below the high water mark on the stick in the channel. Tantalus is mostly clear, greenish, and barely in overflow with mild boil over the center (main) vent, the shoreline vent and the channel vent. |
| 13926 |
12 Oct 2019 @ 1225 |
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cb |
pool is fairly clear and greenish in color. (I can see the sand bar under water) water level is low but still in overflow. Very slight boil in the center & the west shoreline (channel) Root pools are high and the channel full. no bubbles or boil in either pool. |
| 13889 |
05 Oct 2019 @ 1201 |
--- |
cb |
pool is in overflow and water is fairly clear and greenish in color. boiling in the center and in the overflow channel. Root pool both pools are clear and faintly green in color. north pool is 2' below the channel and has a vigorous boil. South pool is 1' below the channel with 3 areas with golf ball sized bubbles. |
| 13844 |
30 Sep 2019 @ 1845 |
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Ben VL |
Root pool is clearer than I've noted it all summer. Can actually see down in it, and the vents on the southern pool are easily visible. Water level around a foot below the topmost part of the land bridge. |
| 13740 |
07 Sep 2019 @ 1432 |
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Polly |
Calm pool |
| 13390 |
25 Aug 2019 @ 0733 |
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ypcaribou |
Full and bubbling in several spots. Too steamy to see color or clarity. Water in Tantalus Creek near Vixen had gray mud in it. Root pool empty except splashing deep in crater on left side. |
| 13380 |
24 Aug 2019 @ 0939 |
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MAB |
Maybe not Tantalus, but something upstream from the Vixen bridge. Tantalus Creek at the bridge was muddy at 0939, and less muddy but not clear at end of day. |
| 13302 |
17 Aug 2019 @ 1713 |
--- |
cb |
Tantalus pool is relatively calm and clear compared to past observations. Only the center area has some small bubbles breaking the surface and sending out convection waves. color is grayish brown but clear at the bridge. No activity in the surrounding area of the pool. Root pools north pool is down 8' from the high water mark. it has a small pool of water in the bottom of the pool that has a vigorous boil. South root pool is empty but the mud is moist! |
| 13255 |
14 Aug 2019 @ 1623 |
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cb |
basicly pool is calm, has a small boil in the center of the pool. water under the bridge by Vixen is clear. ** Dishwater spring is clear, blue and slightly overflowing. ** Root pool's North pool has water in the bottom with a vigorous 1-2' boil. The South pool is empty. |
| 13160 |
11 Aug 2019 @ 0830 |
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RMichaels |
High and boiling muddy water up to a few inches. |
| 13124 |
09 Aug 2019 @ 0816 |
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cb |
Root pool water level is high again - 6" below high water mark on the east side of the north pool. North pool has a 4 point boil. Channel is completely covered with water and both pools are again connected and at the same level. water is a cloudy clay color. Tantalus is the ever changing feature! Today the main pool is mostly calm, 4" lower, with a few areas that have very low bubbles breaking the surface. However, On the NE side, 2' away from the runoff channel, there are 2 pools that are constantly and vigorously boiling, throwing water 1' - 1.5'. Dishwater spring is in overflow again. |
| 13088 |
07 Aug 2019 @ 0750 |
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bbev |
Very steamy, appears full. could not see or hear anything due to heavy steam. |
| 13076 |
06 Aug 2019 @ 1730 |
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cb |
Tantalus is flat and mostly calm. 2 small areas with bubbles. Root pools north pool is about 4' below high water mark with a vigorous 1' boil, south pool was mostly empty with a small pool of water in the base ~ 2' in diameter. |
| 13016 |
04 Aug 2019 @ 0752 |
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cb |
Root pool, south pool is empty and the north pool has water low in the crater with a vigorous boil to ~ 8". Tantalus is 1' below the high water mark with a light boil in the center. |
| 12994 |
03 Aug 2019 @ 0825 |
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cb |
Root pool water level is at the channel and is on the rise. Tantalus pool is high and very steamy. Low level bubblers, 1 - 2", in the same areas of the pool as previous days. ** @ 1300 Root pool structure changed at some point between this mornings observation and 1300. A large clump of soil and debris sluffed off the north pool channel, clogging the channel and changing how the 2 pools exchange water. @1300 Tantalus is one large pool with 1 large boil in the center. water level is high. color is similar to dark chocolate. |
| 12961 |
02 Aug 2019 @ 1723 |
--- |
cb |
arrived this afternoon to find Root pool down to below the channel but appears to be filling. Found Tantalus about 1.5 - 2' below the rim of the pool. Did something big! No obvious sign of an eruption: no splatter spray marks or debris. It is filling from Tantalus creek with multiple boiling areas in the main pool and one in the south runoff channel. I find this fascinating! |
| 12957 |
02 Aug 2019 @ 1201 |
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cb |
root poot is draining out. pool to the north water level is down 5' from high water mark with a roiling boil. south pool is empty. Tantalus is the every changing feature. This afternoon it is erupting in what looks like a crack or fisure in the south runoff channel. small boil in the center where yesterday it was the HUGE boil. Another small boil toward the east. pool is high and thick chocolaty brown in appearance. There is a 3' in diameter yellow sulfurous pool on the north end of Tantalus pool that is steaming and had some runoff into Tantalus. The putrid smell is back! |
| 12950 |
02 Aug 2019 @ 0801 |
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bbev |
Difficult to see in dense geyser fog, but appears quiet and flat in a fairly high pool. May be some boil in center. Root pool gently boiling at north end ~10" below high water mark. |
| 12931 |
01 Aug 2019 @ 1751 |
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bbev |
Gently boiling in center and eastside of a high pool. Root pool separated and boiling ~40" below high water mark. |
| 12923 |
01 Aug 2019 @ 1026 |
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cb |
Root pool is completely drained/empty! I can hear at boiling low in the crater. Tantalus is to 2' - 4' and is VIGOROUSLY BOILING the entire width of the pool in 2 areas. Tantalus is a very muddy, brown black, roiling pool! hum. . . ! Tantalus Creek at the bridge is a thick, dark brown/black, muddy creek. zero clarity. |
| 12900 |
31 Jul 2019 @ 1626 |
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cb |
this afternoons observation has Root pool high with vigorous boil in both pools and Tantalus low with many areas of roiling muddy brown boiling. areas are in the main one in the middle of the pool, 1 on the edge toward Crater Spring, 2 + 1 small, very low almost mud pot*ish (drier area) on the NE edge and 2 in each of the runoff channels toward the bridge. whew. The longer i watch, the more small bubblers i see! |
| 12888 |
31 Jul 2019 @ 0841 |
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cb |
Root pool us low. water just barely in the channel between the 2 pools. moderate boil in both pools. light green in color. Tantalus is more active. 3 main areas with a vigorous roiling wide boil that bloops to 5" in height. muddy brown in color. Runoff water at the bridge is a muddy brown color. |
| 12840 |
28 Jul 2019 @ 0732 |
28 Jul 2019 @ 0745 |
ypcaribou |
Full, calm with some tiny bubbles. Hard to see with steam but looked a bit brown. |
| 12808 |
26 Jul 2019 @ 1021 |
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cb |
Tantalus pool is low. Has 2 areas within the pool, 1 is a light murky green color and the other is a muddy brown. It is mostly a calm flat pool with 5 very small areas that have bubblers. The inflow stream has 2 frying pan springs and 3 areas with small geyser features that reach heights of 3 - 5". Root pool is low, calm and a muddy green in color. no areas that have a boil just a few small bubbles. No putrid smell today! |
| 12797 |
25 Jul 2019 @ 1645 |
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cb |
low pool. water appears clearer than last observed. greenish yellowy (? weird) in color. 2 areas with bubbles not a boil. |
| 12568 |
23 Jul 2019 @ 1120 |
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cb |
Pool is low, light brown in color and really calm. It has 2 areas with a minimal (2") boil. Root pool as a weak boil on the south end and is filling. |
| 12546 |
20 Jul 2019 @ 1332 |
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cb |
much like yesterday except pool is lower. 2 main boiling areas that are only inches high. A dozen or so bubblers in a variety of areas within the main pool. color is opalescent/milky green. (water at the bridge is clear) Root pool is low, (but coming up) it is just above the channel between the 2 pools. it is a murky yellow/green color. putrid smell is barely detectable. |
| 12535 |
20 Jul 2019 @ 0812 |
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bbev |
2D, 2hrs post SB: pool appears low and flat as observed from steerage. |
| 12530 |
19 Jul 2019 @ 1708 |
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cb |
both Root and Tantalus are pretty much the same as this morning except the pools are clearer and a lighter shade of green. |
| 12524 |
19 Jul 2019 @ 1035 |
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cb |
pool is low with 15+ small bubblers and 4 areas with significant boiling. The boil on the south end is a roiling boil to 5". pool color is a light brownish green color. Root pool is on the fill with a 2 point rolling boil on the north end with small bubblers on the west end. color is also greenish brown. It has a slight odor today but not as pungent as it has been this past few weeks. |
| 12502 |
17 Jul 2019 @ 0750 |
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bbev |
Tantalus has slight increase in boil from last evening, relatively clear, in low pool. |
| 12503 |
16 Jul 2019 @ 0815 |
16 Jul 2019 @ 1830 |
bbev |
Remained flat, with light boil, low pool, for most of the day as observed from steerage. |
| 12514 |
15 Jul 2019 @ 1800 |
15 Jul 2019 @ 2115 |
bbev |
Tantalus mostly flat, with low water level, light boil at south end of pool. |
| 12441 |
11 Jul 2019 @ 1615 |
--- |
cb |
calm and pool is high. 2 spots with a 2" boil. water is clearer than yesterday not brackish & muddy. |
| 12396 |
07 Jul 2019 @ 0932 |
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cb |
pool is high again and water is clearer. The mud pot in the south end of the pool is again spouting white water insteady of muddy brackish water. |
| 12111 |
04 Jul 2019 @ 0850 |
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Ben VL |
Tantalus is no longer acting as a mudpot like it was yesterday. The pool is quiet. I observed a small hole immediately east of tantalus after yesterday's 1726 SB push that was bubbling clear water to a couple inches. That hole has since enlarged and is now sitting inside a small crater with a raised edge. It is now perpetually blooping mud or muddy water to a few inches, accompanied by a steam locomotive chugging noise. |
| 12096 |
03 Jul 2019 @ 1000 |
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cb |
water level in the pool is MUCH lower and has morphed into a black/gray sputtering mud pot splashing 1' in height from 2 vents. water in Tantalus Creek at the bridge is clear again. |
| 12023 |
29 Jun 2019 @ 0815 |
29 Jun 2019 @ 1230 |
cb |
Tantalus spring is calm and no longer erupting. root pool is refilling and the "land bridge" connecting the 2 sides of the pool now has a water channel connecting the 2. The icky H2S smell that permeated this area for the past 3 days has greatly diminished! **1230 > Tantalus has one small boil (2 - 3") on the edge closest to the walkway and the water color is not so muddy brown as the last 2 days. On the Northern edge of the pool there are 2 areas that have sizzling blippy mud features in addition to a sulfurous yellow sizzler about 5' N of the pool and in a runoff channel that was first observed yesterday by TC. |
| 12005 |
28 Jun 2019 @ 0745 |
28 Jun 2019 @ 1015 |
ypcaribou |
As seen from boardwalk nearest Tantalus Geyser, it was spouting/splashing dark, muddy water ftom two spots in muddy spring continuously. Lovely aroma wafted my way while I sat nearby watching Steamboat minor play. CB told me she saw it doing muddy splashes on 6-27-19 too. Tantalus Creek water muddy at bridge near Vixen. Collected gray mud at edges and high spots in creek. |
| 12024 |
26 Jun 2019 @ 1730 |
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cb |
Noticed Tantalus Creek was a murky, muddy brown color at the bridge. He walked up toward Echinus to find out the origin of the color change and found Tantalus a muddy brown roiling pool with 3 areas that were erupting. 1 area to height of 3'. |
| 4996 |
21 Sep 1979 @ 1800 |
--- |
research-mab |
09/21/1979 Disturbance “Decker Geyser” increase in activity, erupting 1 to 3 feet with muddy gray water. Bubble brigades of this summer are gone. |
| 5242 |
07 Sep 1976 @ 1800 |
--- |
research-mab |
09/07/1976 Decker Geyser has several actively boiling spots and an active crack vent at the SW edge that is noisily splashing muddy water 4’ high. |
| 7378 |
27 Oct 1967 @ 1800 |
--- |
research-mab |
10/27/1967 Decker – full, quiet and clear green. Activity north of the geyser has virtually died out. |
| 7367 |
27 Sep 1967 @ 1800 |
--- |
research-mab |
09/27/1967 Decker and Root – quiet and full. Virtually all the activity north of Decker has quit. |
| 7364 |
20 Sep 1967 @ 0800 |
20 Sep 1967 @ 1615 |
research-mab |
09/20/1967 Decker Geyser and Root Spring are both drained this morning.
Decker was drained down 2½ feet but showed no signs of an eruption.
Water from Echinus raised the level about 2 or 3 inches. This leaves several questions, 1) when did the drain down occur? 2) How far down had it drained? 3) was there an eruption someplace? Decker filled again at 4:15 pm. |
| 7354 |
18 Sep 1967 @ 1800 |
--- |
research-mab |
09/18/1967 Decker Geyser – quiet – no new activity on north side for over two weeks. |
| 7327 |
11 Sep 1967 @ 1800 |
--- |
research-mab |
09/11/1967 Decker – steam vents have quit. Much of the activity has quieted down on the north side of the pool. |
| 7325 |
30 Aug 1967 @ 1800 |
--- |
research-mab |
08/30/1967
Decker Steam Vent still active. Can be heard from Echinus and Cistern. |
| 7323 |
29 Aug 1967 @ 1800 |
--- |
research-mab |
08/29/1967
A new and powerful steam vent has opened on the north side of Decker Geyser. It can be heard from the lower stage at Steamboat while the big one is quiet. Steam is jetting under high pressure from a crack 2 ft long and ¼ inch wide. Temp 202º |
| 7318 |
23 Aug 1967 @ 1800 |
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research-mab |
08/23/1967
Root Spring and the two green pools west of Arch Steam Vent have drained down about 4 inches. All are still green – no sign of eruption in these or at Decker Geyser. |
| 7312 |
08 Aug 1967 @ 1300 |
--- |
research-mab |
08/08/1967
Decker Geyser – rift vent was playing 1 ft high at 1pm. |
| 7311 |
03 Aug 1967 @ 1200 |
03 Aug 1967 @ 1500 |
research-mab |
08/03/1967
R.H. vent at the new geyser played during afternoon. About 3:00 the water level of the pool dropped and the activity ceased. |
| 7289 |
30 Jul 1967 @ 1800 |
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research-mab |
07/30/1967 Decker Geyser began boiling water to a height of 1½ ft from a new vent near the rift vent. This is a rift about 4 ft long following the curve of the pool. It is in the same position as a small vent that developed during the first eruption but never amounted to much. |
| 7291 |
30 Jul 1967 @ 1100 |
30 Jul 1967 @ 1525 |
research-mab |
07/30/1967 Boiling activity of new vent of Decker Geyser started about 11:00 and ceased a little after 3:10. Water level in the pool began to drop, it fell 5 or 6 inches as activity ceased. Then vent in the middle of the pool began to boil vigorously and the water level rose at 3:18. By 3:25 the pool was almost full; activity was high. Then Echinus dumped into it and cooled it down. The temperature of the new vent was 200º At the same time Echinus measured only 184º about five minutes before an eruption. |
| 7287 |
28 Jul 1967 @ 1245 |
--- |
research-mab |
07/28/1967
Decker Geyser was boiling some water on the south side some 12 to 14” at 12:45 |
| 7301 |
27 Jul 1967 @ 0800 |
--- |
research-mab |
07/27/1967
New Geyser (Decker Geyser) 138º this am, No further excitement. |
| 7308 |
26 Jul 1967 @ 0800 |
--- |
research-mab |
07/26/1967
The new geyser is discharging a little gas from the main vent. Aside from that, all is quiet down there. I’d like to propose the geyser be named for Mrs. Decker – perhaps “Mrs Decker’s Geyser” or “Decker’s Geyser” Temperature in main vent 135ºF |
| 7259 |
25 Jul 1967 @ 1535 |
--- |
research-mab |
07/25/1967 New Geyser began boiling again over the main vent at 3:35 pm. |
| 7286 |
25 Jul 1967 @ 1300 |
--- |
research-mab |
07/25/1967
At 1:00 July 25 the pool was full and clearing with no action (no unusual activity) to be seen. (See more complete report appended to back of this book or on file in Norris Records.) |
| 7285 |
25 Jul 1967 @ 0630 |
--- |
research-mab |
07/25/1967
New Geyser refilled after having drained down 2 feet at 6:30 am. |
