| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 39591 |
31 May 2025 @ 1811 |
--- |
mhreed |
Water not quite at overflow, bubbling in both vents. Water has greenish tint. Water dropped out of sight and was thunking two minutes later. During Corporal eruption. |
| 39551 |
31 May 2025 @ 0701 |
--- |
ypcaribou |
Empty, steaming, gurgling below. Hearing thumping from multiple directions around me |
| 37654 |
19 Oct 2024 @ 1820 |
--- |
MAB |
water in both vents a strange hot chocolate color - Corporal water was clear |
| 35416 |
21 Jun 2024 @ 1427 |
21 Jun 2024 @ 1441 |
nails |
Both vents bubbling, 2 inches below overflow. Water level dropped 1432, some gurgling at depth. Full and bubbling 1441. Starting to drop at 1442 as back bubbling starts in Corporal. |
| 34268 |
19 Apr 2024 @ 1627 |
--- |
MAB |
Resting water level high just an inch below high water mark - See Corporal entry for drain and refill info |
| 29038 |
22 Oct 2023 @ 0956 |
--- |
SantaFe108 |
Full and bubbling in both vents on arrival. Dropped at 1003. Made a weird sort of bathtub drain noise right as Corporal ended. Water visible again at 1009 with Corporal resuming bubbling in the back. Dog's Leg full at 1010 and bubbling resumed. |
| 27178 |
23 Jul 2023 @ 1441 |
--- |
mhreed |
Small bubbles in both vents. Water level 2 inches below rim. |
| 26671 |
25 Jun 2023 @ 1457 |
--- |
steve |
Water rising and falling but that’s all I saw. |
| 23316 |
21 Aug 2022 @ 0745 |
--- |
ypcaribou |
Water in both vents to about 1" from top. Bubbling in both vents, though random. |
| 22384 |
07 Jul 2022 @ 1106 |
--- |
steve |
I could see steam rising from the vent and hear water bubbling but no water. A few minutes later the vents filled with bubbling water. |
| 22246 |
30 Jun 2022 @ 1347 |
--- |
cb |
Deep deep grumbling growling gurgling sounds! 1349 water a rising |
| 21342 |
17 May 2022 @ 0850 |
--- |
mhreed |
Clunking noises at depth. During Corporal eruption. Two minutes later, water slowly filled with ~3 inch splashing. |
| 21279 |
14 May 2022 @ 1632 |
--- |
mhreed |
Water one inch below overflow. |
| 20089 |
22 Oct 2021 @ 0906 |
--- |
MAB |
water level same - down about 6in but visible |
| 20025 |
17 Oct 2021 @ 0917 |
--- |
MAB |
still 6in down but water is visible |
| 19950 |
10 Oct 2021 @ 1652 |
--- |
MAB |
resting water level up ~1in from Tuesday- still low about 5in below rim |
| 19905 |
05 Oct 2021 @ 0857 |
--- |
MAB |
visible water 6in down - with blurpy noises as Corporal began |
| 19550 |
08 Sep 2021 @ 1015 |
--- |
CrisG |
No water noted in spring before, during, or after eruption of Corporal. Vents do steam in cooler conditions. |
| 14674 |
18 Jun 2020 @ 1838 |
--- |
jkgood |
Water visible- several inches below surface |
| 14672 |
18 Jun 2020 @ 1014 |
--- |
jkgood |
No water visible |
| 11327 |
22 May 2019 @ 0703 |
--- |
Kyle |
no water visible in either vent. audible gurgling sounds at depth |
| 11319 |
21 May 2019 @ 0908 |
--- |
Kyle |
water visible in vent approx 3-4 in below rim, calm |
| 11330 |
20 May 2019 @ 0821 |
--- |
Kyle |
water on both vents, calm, 3 in below over flow |
| 9711 |
13 Aug 2018 @ 1118 |
--- |
Kent |
Dog Leg @ Norris - Water in pools but down two inches. No activity. |
| 29602 |
21 Sep 2016 @ 1148 |
--- |
research-mab |
9/21/2016 Dog’s Leg Springs vents are filled with water almost to the brim 1148 |
| 37623 |
01 Jan 2014 @ 0000 |
--- |
research-mab |
If you see this let me know, and the date. If you don't know my email address feel free to flag it and I'll get a notification that way. MAB |
| 4721 |
08 Sep 1998 @ 1800 |
--- |
research-mab |
9/8 Dog leg looked odd today. Instead of filling quietly after Corp’s eruption, it had rapid boiling out of 2 vents. Hmmm |
| 30024 |
19 Jun 1996 @ 1200 |
--- |
research-mab |
6/19/1996 - no time noted - Dog Leg is very low but Corporal and Veteran seem about normal. |
| 30297 |
06 Sep 1993 @ 1515 |
--- |
research-mab |
9/6/1993 Also the small vents with yellow sulfur near Veteran/Corporal has changed. This AM the vents were empty as they have been since the disturbance. This afternoon around 3:15 the two vents had hot water to the rim of the vents. |
| 7594 |
05 Feb 1989 @ 0000 |
05 Feb 1989 @ 2359 |
JSJ |
Dog's Leg Spring - no recent (last month) runoff. Water level varies. |
| 4842 |
14 Aug 1988 @ 1800 |
--- |
research-mab |
8/14/1988 Dog’s Leg is overflowing more, but not erupting |
| 30828 |
06 Aug 1988 @ 1200 |
--- |
research-mab |
8/6/1988 - no time noted - Dog’s Leg- no noticeable change from earlier in the season |
| 30884 |
17 Aug 1987 @ 1200 |
--- |
research-mab |
8/17/1987 - no time noted - Dog’s Leg ph 4, T 166ºF * This geyser erupts to about 6”-12” periodically
Corporal ph4, T 157ºF |
| 30879 |
04 Aug 1987 @ 1200 |
--- |
research-mab |
Aug 4 (1987) - no time noted - Dog Leg & Corporal Geyser are quiet. |
| 30874 |
02 Aug 1987 @ 1200 |
--- |
research-mab |
August 2, 1987 - no time noted - Dog Leg was not erupting at last observation- |
| 30868 |
28 Jul 1987 @ 1200 |
--- |
research-mab |
7-28-1987 - no time noted - Dog’s Leg is spouting perpetually to 3 ft and overflowing into Corporal Geyser. |
| 33455 |
15 Mar 1987 @ 1200 |
--- |
research-mab |
March 15, 1987 - no time noted - Corporal Geyser and Private (or Dog’s Leg) Geyser– The mystery geyser was in a calm boil around 6-9 inches high. Corporal is impossible to [tell] if it is in or not in eruption because of the overflow into its crater. Corporal may not even be active! |
| 30938 |
03 Jul 1985 @ 1200 |
--- |
research-mab |
July 3 1985 – no time noted - Dog Leg 197ºF boiling continuously & overflowing into Corporal |
| 31073 |
20 May 1983 @ 1200 |
--- |
research-mab |
May 20 1983 - no time noted - Disturbance!... Dog’s Leg- Little change. Splashing several inches and overflowing into Corporal. Corporal itself is clear and quiet. |
| 31068 |
19 May 1983 @ 1200 |
--- |
research-mab |
May 19 1983 - no time noted - Dog’s Leg – Full and splashing 6-8 inches. |
| 31062 |
12 May 1983 @ 1200 |
--- |
research-mab |
(May 12 83) - no time noted - Dog’s Leg – Continuously overflowing into Corporal. Dog’s Leg’s vent is coated with sulfur, and at the point where Dog’s Leg’s water entered Corporal’s crater, there is a yellow patch of sulfur also. |
| 31039 |
08 Jan 1983 @ 1200 |
--- |
research-mab |
January 8 1983 - no time noted - Dog’s Leg sulphur lined & bubbling 188º overflowing into Corporal |
| 31361 |
31 Jul 1982 @ 1200 |
--- |
research-mab |
7/31/1982 - no time noted - Dog’s Leg 176° clear calm H2O
Corporal 176° dark green slightly turbid H2O, calm |
| 31324 |
10 Jul 1982 @ 1515 |
--- |
research-mab |
7/10/1982 Dog Leg Spring: boiling @ 1515 -
Corporal: boiling @ 1515, splashing 4-6” no overflow |
| 31312 |
08 Jul 1982 @ 1200 |
--- |
research-mab |
7/8/1982 - “About 1200” - Corporal - down with no overflow but channel still has running water
Dog Leg Spring – full to 2 inches below sinter platform, boiling
Wet area for Dog Leg along edge of Corporal onto trail. Dog Leg major?
→ New hot spot on trail directly across from Corporal. Ground is also wet there. |
| 31243 |
20 Feb 1982 @ 1200 |
--- |
research-mab |
February 20 1982 - no time noted - Corporal Geyser 142º green algae lined. Receiving Dog’s Leg’s runoff & causing it to overflow slightly. I don’t think that it is erupting anymore.=
Dog’s Leg 188º Yellow sulfur around vent & in runoff with filamentous bacteria waving in the H20. (A week later, it was boiling vigorously along the vent.) |
| 31186 |
14 Jan 1982 @ 1200 |
--- |
research-mab |
January 14th 1982 - no time noted - Corporal Geyser – 138º calm, still overflowing periodically.
Dog’s Leg now has its own 4’ pool. A new vent has been formed & the water level is up~4”. There is constant overflow into Corporal but it still seems to be erupting. Occasional gentle boil & pool) has a sulphur lining. 184º |
| 31573 |
15 Nov 1981 @ 1200 |
--- |
research-mab |
Nov 15 1981 – no time noted – {post-quake check} Corporal 164° between eruptions, dark green clear H2O
= Dog’s Leg 174° between eruptions |
| 31492 |
09 Aug 1981 @ 1200 |
--- |
research-mab |
Sunday August 9, 1981 - no time noted - Corporal & Dog’s Leg are back to behaving normally again with Dog’s Leg draining as Corporal’s water level rises. After Corporal’s overflow & subsequent lowering of water Dog’s Leg is filling back up again. |
| 31482 |
05 Aug 1981 @ 1623 |
--- |
research-mab |
August 5, 1981 - inferred time - Dog’s Leg has blown out a new vent! Now is ~3 ½’ by 1’ (tiny sketch) splashing to 3’ in left vent & 2’ in right. 200º Board walk moved. |
| 31785 |
20 Sep 1980 @ 1200 |
--- |
research-mab |
Saturday September 20 1980 - no time noted - Dog’s Leg – filled 2/3 and bubbling 163º, following drain, then fill up 170ºF
= Corporal Geyser – slightly murky 161ºF before eruption 172 at vent during eruption |
| 31693 |
16 Aug 1980 @ 1200 |
--- |
research-mab |
Sat Aug 16 - no time noted - Corporal Geyser- Slightly murky, not in eruption. Temp. 170°F
= Dogs Leg – Full of clear water – 176°F |
| 31669 |
17 Jul 1980 @ 1200 |
--- |
research-mab |
July 17, 1980 - no time noted - Corporal Geyser 170°F not ie, 179°F while ie
= Dogs Leg – 176°F when full pool, 181°F while refilling following a Corporal eruption |
| 31635 |
09 Jun 1980 @ 1200 |
--- |
research-mab |
June 9 1980 - no times - observations made over the week and entered on 9th - Corporal Geyser – 164ºF before eruption, 181ºF during eruption
= Dog’s Leg Spring 179ºF before and after drain during Corporal’s eruption |
| 31959 |
20 Sep 1979 @ 1800 |
--- |
research-mab |
Thursday Sept 20 1979 - Disturbance check after 1730 - Corporal Geyser and The Dog’s Leg – The trail south of these two features was found to be very wet. Foot prints covering water flowing makes point towards the possibility of a major eruption last night. Dogs Leg (170ºF) bubbling hard before Corporal eruption. As Corporal erupts, Dogs Leg drained with loud gurgling. Corporal temp ie 176ºF.
It seemed to me that the odor of H2S was stronger in the basin this evening. |
| 31887 |
29 Jul 1979 @ 1200 |
--- |
research-mab |
July 29 1979 - no time noted - Dog’s Leg – 182ºF, ph 4.3, Corporal before eruption 164ºF, ph 4.3 |
| 31864 |
05 Jul 1979 @ 1200 |
--- |
research-mab |
July 5 1979 - no time noted - Corporal Geyser 167ºF as it was starting an “eruption”
= Dog Leg 177ºF |
| 32217 |
15 Sep 1978 @ 1200 |
--- |
research-mab |
09/15/1978 - no time noted - ...basin wide disturbances continue! - Corporal Geyser – 163º when not ie
= Dog’s Leg – 167º filled with water |
| 32106 |
12 Jun 1978 @ 0845 |
--- |
research-mab |
06/12/1978 Corporal Geyser 0845 ie a few inches high. It’s neighbor Dog’s Leg was draining. |
| 32419 |
14 Jul 1976 @ 1720 |
--- |
research-mab |
July 14 1976 - inferred approx time - Dog’s Leg - - acts in sympathy with the eruptive phase of Corporal. Near the end of Corporal’s most vigorous eruptive activity Dog’s Leg is devoid of water. Immediately after the eruption ceased in Corporal Dog’s Leg filled. Dog’s Leg remained at least partially filled until Corporal again resumed its vigorous eruption some 18 minutes later. |
| 32933 |
28 Sep 1972 @ 1200 |
--- |
research-mab |
09/28/1972 - no time noted - Watched another exciting eruption of Corporal. I’ll only add that while pool is draining, the “Dogleg” makes a gurgling sound. |
| 32927 |
07 Sep 1972 @ 1200 |
--- |
research-mab |
09/07/1972 - no time noted - ...many of the features in the Back Basin (ie Mud, Mystic, Yellow Funnel and Dishwater springs, corporal geyser & Dog Leg) are still low, turbulent and muddy. |
| 32916 |
31 Aug 1972 @ 1949 |
--- |
research-mab |
08/31/1972 - At 7:49 PM Corporal Geyser had bubbling activity & overflowed for approximately 1 minute while at this time the Dog’s Leg was completely dry. The bubbling in Corporal stopped, its water level quickly dropped 4-4½ inches & the Dog’s Leg had refilled by 7:51 with the water level pulsating 1 inch. |
| 32917 |
31 Aug 1972 @ 1949 |
--- |
research-mab |
08/31/1972 - At 7:49 PM Corporal Geyser had bubbling activity & overflowed for approximately 1 minute while at this time the Dog’s Leg was completely dry. The bubbling in Corporal stopped, its water level quickly dropped 4-4½ inches & the Dog’s Leg had refilled by 7:51 with the water level pulsating 1 inch. |
| 33208 |
16 May 1972 @ 1201 |
--- |
research-mab |
Corporal Geyser 1972 – May 16 - no time - 153F “Dog Leg” 188F
Bubbling action from the Dog Leg, no action in the main spring. Most of the water coming up from the Dog Leg is going back down in the main spring, very little over flow. |
| 32888 |
16 May 1972 @ 1200 |
--- |
research-mab |
05/16/1972 - no time noted - Corporal Geyser – Pool= 153º
Spring 188 much sulfur coming out of spring and being deposited {dog leg} |
| 32954 |
12 Sep 1971 @ 1500 |
--- |
research-mab |
09/12/1971- {afternoon temps 2-4pm} - Corporal 147° receives more H2O from Dog’s Leg than it gives |
| 33214 |
17 Aug 1969 @ 1200 |
--- |
research-mab |
Aug 17 1969 - no time - No activity from the “dog leg” crater to the east last or this year |