Last Known Eruption
45y 48d 4h 16m ago

Latest Eruptions

Eruption DurationInterval
06 Sep 1974 @ 121548d 19h 41m
19 Jul 1974 @ 16345h 36m
19 Jul 1974 @ 1058

Interval Statistics

Interval Count2
Min5h 36m
Max48d 19h 41m
Mean24d 12h 38m
Median24d 12h 38m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
13429 27 Aug 2019 @ 1324 --- Betty Boiling from a low muddy pool
13249 14 Aug 2019 @ 1522 --- cb pool is up a bit since last observation. Up to the stick on the south edge. Color is muddy brown; think hot chocolate. boiling in 2 areas on the west edge.
13047 05 Aug 2019 @ 0905 --- MAB low churning light water
12894 31 Jul 2019 @ 1030 --- cb vigorous boil. clay light brown in color. pool is higher than last observed by about 6"
12841 28 Jul 2019 @ 0622 --- ypcaribou Water low in pool. Gray and muddy. Roiling to about a foot periodically.
12442 11 Jul 2019 @ 1636 --- cb Congress pool water level is low and down 8' from the rockwork below the bw. color is a brownish green with 2 bubbling points.
12036 29 Jun 2019 @ 1405 --- cb About 6" above the inner tube rim closest to the boardwalk. Blue green in color with 2 areas producing bubbles 1 - 2" in diameter
11826 16 Jun 2019 @ 1026 --- cb water level is up 18" from the inner tube rim. ( side closest to the boardwalk) Color is turquoise blue and a bit cloudy. 2 areas with slight bubbles > center and southwest edge.
11620 07 Jun 2019 @ 1032 --- CrisG Water level about 5' below shoreline. Turquoise with a milky haze. very light bubbling.
11158 03 May 2019 @ 1941 --- cb Low water level. 10 - 12' below overflow. Muddy water with 2 areas that have a significant boil
11144 02 May 2019 @ 0952 --- MAB low brown fairly strong boil in 2 spots
11018 20 Apr 2019 @ 1007 --- MAB Low, brown.
10720 04 Nov 2018 @ 1026 --- MAB Dropped a few more inches since 10-28. Snow encircles the crater except for the east side towards Locomotive/Vermillion area. A very pretty last view.
10675 28 Oct 2018 @ 1725 --- MAB Water level dropped along the shore line about one foot since last Monday. It is now in the steeper part of the crater and may be harder to track the receding, but I'll keep watching it. Still a pretty blue color.
10626 19 Oct 2018 @ 1222 --- MAB Blue color, water level is 2 feet lower on the shoreline {below the white pointy rock} from a month ago.
10617 17 Oct 2018 @ 1120 --- Kent Clear. Steam but calm. Two feet below last month.
10510 30 Sep 2018 @ 1720 --- MAB Congress Pool is on the rise again! Comparative photos from 23rd and today show a rise of about a linear foot along the shoreline closest to the walk. Still a pretty blue color. Water level remained the same today from 0930-1720
10445 25 Sep 2018 @ 1151 --- bbev Down from last week, maybe 4.5 to 5' from " tiny tree" marker. Remains clear blue with some bubbles.
10416 23 Sep 2018 @ 1800 --- MAB water level dropped around 3 inches since 22nd
10350 22 Sep 2018 @ 1000 22 Sep 2018 @ 1600 MAB Comparison photos show Congress water level dropped .5 inch during that time. Still a pretty blue color.
10289 18 Sep 2018 @ 1129 --- bbev Down some from last week, maybe 3.5 to 4' below overflow, 2' from "tiny tree". Still clear with sume bubbles.
10275 17 Sep 2018 @ 1733 --- MAB Still a pretty blue color, water level dropped an inch since the 15th.
10206 14 Sep 2018 @ 1600 --- MAB Still a beautiful blue, Congress is dropping. At 1600 water level was about 2 feet from the road/trail rockwork. At its highest level, water had reached those rocks. The poor little lodgepole sapling that was half submerged is out of the water, the lower half with dead needles.
10166 12 Sep 2018 @ 1154 --- bbev Down maybe 2-3' below overflow, 14" from "tiny tree" next to boardwalk. Still blue and clear, small bubbles in center of pool.
9936 29 Aug 2018 @ 1138 --- bbev Wateri2' below overflow. Water clear, blue, unchanged from yesterday
9915 28 Aug 2018 @ 1127 --- bbev Nearly clear, blue, water level up from last week, "tiny tree" now half submerged. Some bubbling in center.
9876 25 Aug 2018 @ 0708 --- bbev Water level maybe 24-30" from overflow, 1" up the rock wall at boardwalk. Mostly clear, blue, lightly bubbling.
9862 24 Aug 2018 @ 0955 --- MAB Comparative photos = Fail. Water level either stabilized or dropped a tad. Did not see a marked increased from 0955-1657 as I had in recent observations.
9838 22 Aug 2018 @ 1015 --- MAB The poor little lodgepole sapling on the west edge is now under water. Water is now near the bottom of the old road rockwork. Pretty and blue.
9808 21 Aug 2018 @ 1132 --- bbev Water level high, at the base of the "tiny tree" near the boardwalk. Clear beautiful, turquoise blue pool, slightly boiling.
9756 17 Aug 2018 @ 1000 17 Aug 2018 @ 1615 MAB Congress rose 1 inch during these 6 hours. (Comparative rock photos)
9730 15 Aug 2018 @ 0940 15 Aug 2018 @ 1740 MAB Based on the small lodgepole sapling 12" west of the pool and a nearly submerged rock, Congress rose 1.5 inches between 0940 and 1740. Color is blue, water level about a meter below overflow on the south rim.
9720 14 Aug 2018 @ 1945 --- bbev High, somewhat clear, blue, edge of pool is damp 4-6" above water level, light bubbling. Large pool, maybe 500-600' to the NE(?) of Congress, on side of hill below old road, has began to overflow. It had been empty since June and noticed it near full last week. Porcelain springs putting out more water and basin appears to be getting wetter.
9709 13 Aug 2018 @ 0930 --- Kent Pool full to top of old ring, about 18 inches below overflow. Very blue.
9609 10 Aug 2018 @ 1000 10 Aug 2018 @ 1800 MAB Still opaque green with higher water level. Comparison photos show it rising about 1 inch during the day
9584 09 Aug 2018 @ 1120 --- bbev Higher than 2 days ago
9559 08 Aug 2018 @ 1823 --- MAB Water level higher than 2 days ago; per Byron it had risen more since this morning. Changed from blueish to an opaque sea green w/light bubbles from two places.
9518 07 Aug 2018 @ 1134 --- bbev Water level is 2' above level observed last week. No longer boiling vigorously, only a few bubbles over closest vent.
9501 06 Aug 2018 @ 1530 --- MAB Congress Pool has transformed from ugly dark chocolate low boil with water level up about two feet higher and a pretty blue! I will grill the staff and try to pin down when this occurred
3664 12 Sep 2016 @ 1050 --- Kent Pool clear, not muddy or turquoise and at about the same level as observed on July 5, 2016
3552 26 Aug 2016 @ 1215 --- Kent Water level near where it has been all summer. Water turquoise not gray or brown.
3386 28 Jul 2016 @ 1515 --- MAB Water is CLEAR blue since my last wander by there (too much Vixen, it's been a while. I will find out from staff when it cleared up)
1528 17 Apr 2015 @ 0910 --- Kent Pool a nice shade of turquoise. Level about the same as closing weekend 2014
5379 01 Feb 1995 @ 1800 --- research-mab 02/01/1995 The water level in Congress is up about 3 feet since 1/19. Carnegie remains cold.
4704 11 Jun 1990 @ 1800 --- research-mab 6/11/1990 Congress pool is drained. First time I’ve seen that – small amt of water visible & audible deep in its throat.
7640 26 Jun 1986 @ 1800 --- research-mab 6-26-1986 Congress Pool – opaque dark gray muddy caldron. Water level down ~2m with 2 points of boil up to 1m high. Slight pyrite film on surface. T=199º
5115 19 Aug 1977 @ 1800 --- research-mab 08/19/1977 Congress is murky again instead of blue.
5114 11 Aug 1977 @ 1800 --- research-mab 08/11/1977 The water level in Congress Pool has risen some and is getting bluer again.
4954 22 Sep 1976 @ 1800 --- research-mab 09/22/1976 Congress Pool was erupting, could see the column of water over its edge. Estimate some eruptions at 6-7’. This is a great increase over the activity of the past week.
5550 11 Jul 1976 @ 1800 --- research-mab 07/11/1976 Congress Pool has begun to boil up to 18” high every few minutes.
5686 13 Sep 1975 @ 1800 --- research-mab 09/13/1975 Congress Pool is now about 4 ½ below high water mark and is erupting. Highest bursts last seen were about 3’.
5698 06 Sep 1975 @ 1800 --- research-mab 09/06/1975 Congress now down 3 ½ – 4’
5694 05 Sep 1975 @ 1800 --- research-mab 09/05/1975 Congress Pool continuing to drop, boiling more vigorously.
5665 31 Aug 1975 @ 1800 --- research-mab 08/31/1975 Congress Pool – level in Congress has dropped to all-time low for the summer. Water level is approximately 3 ft below the high water mark.
5658 26 Aug 1975 @ 1800 --- research-mab 08/26/1975 Congress Pool – continuing to drop in water level - approximately 3’ down from overflow level.
5656 24 Aug 1975 @ 1800 --- research-mab 08/24/1975 Congress Pool – 178º Water level is down two feet. Eruptive activity noted last week has ceased; pool is turbid.
5640 20 Aug 1975 @ 1800 --- research-mab 08/20/1975 Congress Pool – vigorous bubbling at center of feature, water has turned turbid. Temp 178º {no time}
5635 18 Aug 1975 @ 1800 --- research-mab 08/18/1975 Congress Pool – water level has dropped approximately 1 foot.
5624 26 Jul 1975 @ 1800 --- research-mab 07/26/1975 Congress Pool is quite blue appears to be clearing. This feature is the bluest its been all summer.
5619 22 Jul 1975 @ 1800 --- research-mab 07/22/1975 Congress Pool – full, clearing and no overflow. Much steam being emitted.
5606 15 Jul 1975 @ 1800 --- research-mab 07/15/1975 Congress Pool has refilled to its level previous to earthquake. Overflow was noted for the first time since quake.
5596 30 Jun 1975 @ 1800 --- research-mab 06/30/1975 Congress turned Grey – no change otherwise – little runoff {post quakes}
5847 24 Sep 1974 @ 1800 --- research-mab 09/24/1974 Congress- Still full & overflowing – but more gray than black in color. Activity pattern is very weak.
5843 22 Sep 1974 @ 0900 22 Sep 1974 @ 1500 research-mab 09/22/1974 Congress Pool – about 1” below overflow, 1500, just beginning a slight overflow
5839 21 Sep 1974 @ 1800 --- research-mab 09/21/1974 Congress Pool – almost up to overflow and quiet
5834 20 Sep 1974 @ 1800 --- research-mab 09/20/1974 Congress Pool- quiet water, level less than 1’ below overflow
5829 19 Sep 1974 @ 1800 --- research-mab 09/19/1974 Congress- Continuing to rise- activity is much subdued.
5822 14 Sep 1974 @ 1800 --- research-mab 09/14/1974 Congress Pool – still having rather violent eruptions (to !6’ max) but water level now down only ~3 feet.
5850 13 Sep 1974 @ 1800 --- research-mab 09/13/1974 Congress- activity as before, water level certainly on the way up.
5819 12 Sep 1974 @ 1800 --- research-mab 09/12/1974 Congress- H20 level about 6” higher- activity not quite as vigorous as it has been
5820 10 Sep 1974 @ 1800 --- research-mab 09/10/1974 Congress- Still down & active as it has been the past several days
5818 09 Sep 1974 @ 1800 --- research-mab 09/09/1974 Congress – today like yesterday, bursts sometimes very sudden and massive. Water level appears to have stabilized.
5816 08 Sep 1974 @ 1800 --- research-mab 09/08/1974 Congress Pool – about the same as yesterday. Mud had reached the guardrail and boardwalk sometime during the night.
5809 07 Sep 1974 @ 1800 --- research-mab 09/07/1974 Congress Pool – much like yesterday, perhaps somewhat more violent. Water level down ~9” - now 5-5 ½ ‘ down. Down another 3-4” this pm.
5813 06 Sep 1974 @ 1215 07 Sep 1974 @ 1315 research-mab 09/06/1974 Congress Pool: times in seconds observed from 1215 to 1315 Interval Duration Heights* (max) i=27s d=151s h=10’, i=32s d=145s h=4’, i=37s d=173s h=6’, i=18s d=167s h=10’, i=46s d=165s h=6’, i=51s d=117s h=8’, i=65s d=118s h=8’, i=63s d=88s h=12’, i=27s d=100s h=4’, i=10s d=152s h=8’, i=28s d=255s h=8’, i=33s d=97s h=10’, i=46s d=147s h=8’, i=52s d=71s h=4’, i=49s d=76s h=12’, i=51s d=75s h=15’, i=29s d=212s h=8’, i=51s d=113s h=6’, i=56s d=106s h=15’, i=46s d=262s h=4’, i=67s d=57s h=6’, * Heights are approx, figuring my eye level while standing on the boardwalk to be ~11’ above the water level. TSB
5805 06 Sep 1974 @ 1200 --- research-mab 09/06/1974 Congress Pool – is geysering – beautifully periodic; completely quiet intervals of ~50 sec, violent boiling & surging to 6 or 8’, durations ~100 sec. I will get pictures. See next page for data taken in PM [TSB]
5802 05 Sep 1974 @ 1800 --- research-mab 09/05/1974 Congress Pool Has dropped another foot – down therefore about 4 ½ ft – boiling vigorously up to 3ft every few seconds.
5799 01 Sep 1974 @ 1800 --- research-mab 09/01/1974 Congress Pool – down 3 ½ feet, some heavy boiling
5795 29 Aug 1974 @ 1800 --- research-mab 08/29/1974 Congress Pool – H20 level down about 3 vertical feet
5776 26 Aug 1974 @ 1800 --- research-mab 08/26/1974 Congress Pool – H20 still down about 2- 2 ½ ft.
5774 24 Aug 1974 @ 1800 --- research-mab 08/24/1974 Congress Pool – H20 now down ~2’
5770 23 Aug 1974 @ 1800 --- research-mab 08/23/1974 Congress Pool water level now down ~18”, heavy surging
5763 15 Aug 1974 @ 1800 --- research-mab 08/15/1974 Congress violent surging H20 level down ~6” , no o’flow
5734 25 Jul 1974 @ 1800 --- research-mab 07/25/1974 Congress Pool : boiling vigorously, murky grey, with slight overflow
5733 22 Jul 1974 @ 1800 --- research-mab 07/22/1974 Congress Pool – still boiling vigorously – murky w/ some overflow
5717 19 Jul 1974 @ 1800 --- research-mab 07/19/1974 Congress Pool still heavy boiling, murky=grey with some overflow.
5730 17 Jul 1974 @ 1800 --- research-mab 07/17/1974 Congress Pool – still murky (gray) & boiling heavily- there has been some run-off recently.
5728 16 Jul 1974 @ 1800 --- research-mab 07/16/1974 Congress Pool heavier boiling over 2? vent. Water now very murky bluish-gray.
6187 29 Sep 1973 @ 1800 --- research-mab 09/29/1973 Congress Pool still clear, deep blue.
6192 28 Sep 1973 @ 1500 --- research-mab 09/28/1973 1500 Congress Pool very clear blue color.
6183 26 Sep 1973 @ 1800 --- research-mab 09/26/1973 Congress Pool is back to normal water level & is very blue.
6178 22 Sep 1973 @ 1800 --- research-mab 09/22/1973 Congress blue color. Jetsam - clear & green
6176 21 Sep 1973 @ 1800 --- research-mab 09/21/1973 Congress Pool up couple of inches and bluer.
6169 20 Sep 1973 @ 1800 --- research-mab 09/20/1973 Congress Pool is quieter now & shows more color (bluish tint) instead of its recent churning grey. Water level is still low.
6157 18 Sep 1973 @ 1800 --- research-mab 09/18/1973 Congress pool still very low
6144 14 Sep 1973 @ 1640 --- research-mab 09/14/1973 4:40 pm Porcelain Basin Congress Pool water level is the lowest that has ever been noted at that spring, down about 2’
6088 27 Aug 1973 @ 1800 --- research-mab 08/27/1973 Congress Pool dropped at least an inch more;
6086 26 Aug 1973 @ 1800 --- research-mab 08/26/1973 Congress still grey & drop of water level a couple of inches; Scummy Pool has settled
6076 22 Aug 1973 @ 1800 --- research-mab 08/22/1973 Congress Pool still murky grey.
6064 19 Aug 1973 @ 1800 --- research-mab 08/19/1973 Congress is murky grey today.
No attachments for this geyser.
Baseline does not exist.


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