Last Known Eruption
29y 137d 7h 35m ago

Latest Eruptions

Eruption DurationInterval
07 Aug 1990 @ 13402m 3y 340d 23h 50m
01 Sep 1986 @ 135034d 22h 7m
28 Jul 1986 @ 15433h 50m
28 Jul 1986 @ 115321h 20m
27 Jul 1986 @ 14336m
27 Jul 1986 @ 1427338d 17h 57m
22 Aug 1985 @ 20305h 41m
22 Aug 1985 @ 14492d 18h 27m
19 Aug 1985 @ 20221.5m 5h 6m
19 Aug 1985 @ 15162.5m 3h 26m
19 Aug 1985 @ 11502.5m 5h 0m
19 Aug 1985 @ 0650 ie11d 16h 9m
07 Aug 1985 @ 144130d 18h 10m
07 Jul 1985 @ 20312m 3h 31m
07 Jul 1985 @ 17002m 3h 31m
07 Jul 1985 @ 13292m 3h 31m
07 Jul 1985 @ 09582m 10d 14h 47m
26 Jun 1985 @ 19114h 21m
26 Jun 1985 @ 14502h 25m
26 Jun 1985 @ 1224:245d 19h 22m
20 Jun 1985 @ 1702 ie4h 16m
20 Jun 1985 @ 1246324d 14h 24m
30 Jul 1984 @ 2221:373d 1h 1m 37s
27 Jul 1984 @ 2120:002m 30s 4h 32m 10s
27 Jul 1984 @ 1647:502m 59s 4h 40m 13s
27 Jul 1984 @ 1207:372m 38s 4h 51m 25s
27 Jul 1984 @ 0716:122m 20s 5d 15h 16m
21 Jul 1984 @ 16004m 311d 21h 42m
13 Sep 1983 @ 1818 min5h 18m
13 Sep 1983 @ 130024d 23h 29m
19 Aug 1983 @ 1330:523m 7s 6h 2m
19 Aug 1983 @ 072818h 23m
18 Aug 1983 @ 13051d 20h 35m
16 Aug 1983 @ 16305h 52m
16 Aug 1983 @ 103820h 13m
15 Aug 1983 @ 14253d 15m
12 Aug 1983 @ 14105d 2h 38m
07 Aug 1983 @ 11327d 23h 2m
30 Jul 1983 @ 12302d 4h 14m
28 Jul 1983 @ 0816 ie22h 36m
27 Jul 1983 @ 094020h 3m
26 Jul 1983 @ 1337 ie1d 23h 1m
24 Jul 1983 @ 14362m 3h 51m
24 Jul 1983 @ 104564d 54m
21 May 1983 @ 09513m 32s 12h 46m
20 May 1983 @ 2105 ie223d 2h 10m
09 Oct 1982 @ 18554d 2h 26m
05 Oct 1982 @ 1629 ie5d 1h 54m
30 Sep 1982 @ 143527d 19h 37m
02 Sep 1982 @ 18582h 48m
02 Sep 1982 @ 161021h 8m
01 Sep 1982 @ 19025h 37m
01 Sep 1982 @ 13256d 16h 20m
25 Aug 1982 @ 21053d 6h 30m
22 Aug 1982 @ 14352m 24s 4d 17h 29m
17 Aug 1982 @ 21061d 4m
16 Aug 1982 @ 21022h 34m
16 Aug 1982 @ 18282h 23m
16 Aug 1982 @ 1605 ie1d 22h 33m
14 Aug 1982 @ 17322h 56m
14 Aug 1982 @ 14363h 59m
14 Aug 1982 @ 10372d 1h 3m
12 Aug 1982 @ 093410d 17h 9m
01 Aug 1982 @ 16251h 47m
01 Aug 1982 @ 14383h 39m
01 Aug 1982 @ 10597d 19h 38m
24 Jul 1982 @ 15212h 49m
24 Jul 1982 @ 12322h 38m
24 Jul 1982 @ 095416d 2h 59m
08 Jul 1982 @ 06551d 22h 58m
06 Jul 1982 @ 075719h 34m
05 Jul 1982 @ 122317h 37m
04 Jul 1982 @ 18463h 39m
04 Jul 1982 @ 15073h 52m
04 Jul 1982 @ 111520h 48m
03 Jul 1982 @ 14273h 39m
03 Jul 1982 @ 104815h 13m
02 Jul 1982 @ 1934:233d 3h 54m
29 Jun 1982 @ 15406d 23h 18m
22 Jun 1982 @ 16225d 18h 49m
16 Jun 1982 @ 21331d 1h 45m
15 Jun 1982 @ 19481m 36s 3h 31m
15 Jun 1982 @ 16173m 17s 1d 7h 37m
14 Jun 1982 @ 08403d 20h 18m
10 Jun 1982 @ 12222d 17h 42m
07 Jun 1982 @ 184022h 15m
06 Jun 1982 @ 2025272d 5h 55m
07 Sep 1981 @ 14307d 18h 32m
30 Aug 1981 @ 195810d 3h 12m
20 Aug 1981 @ 1646 ie6h 40m
20 Aug 1981 @ 10062m
20 Aug 1981 @ 10046d 1h 24m
14 Aug 1981 @ 0840 A10d 34m
04 Aug 1981 @ 08066d 14h 6m
28 Jul 1981 @ 1800 ie10h 0m
28 Jul 1981 @ 0800 ie1d 11h 51m
26 Jul 1981 @ 20091d 2h 27m
25 Jul 1981 @ 17421d 20h 42m
23 Jul 1981 @ 21005d 16h 54m
18 Jul 1981 @ 040612h 25m

Interval Statistics

Interval Count100
Min2m
Max3y 340d 23h 50m
Mean33d 1h 53m
Median1d 54m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
4847 19 Aug 1985 @ 2100 --- research-mab Bear Den 8/19/1985: Interesting Note: Bear Den would always make deep rumbling soon before it erupts & the water (greenish looking) in Ebony Geyser would come to the surface. On the long intervals 5 hours or so- Bear Den Geyser would rumble & so forth first would not erupt – always 3 to 3 ½ hours from the previous eruption.
4845 07 Jul 1985 @ 0818 --- research-mab BEAR DEN 7/7/1985 Also at 8:18 a.m. - water shot out briefly in one spurt/burst to 5 to 10 feet then back in its hole. Most of the eruptions, the first bursts were smaller while the middle and later ones were bigger. The height in the bursts were up to 50 to 70 feet. About 1 minute or so before the eruption, there was a loud brief gurgling sound from deep within the Geyser.
4667 30 May 1983 @ 1800 --- research-mab 5/30/1983 V.R. (reliable geyser gazer) that Bear Den had all the normal preliminary signs of a typical eruption except that all that happened was one, 1’ splash.
4619 27 Sep 1980 @ 1800 --- research-mab 9/27/1980 Bear Den Geyser – has been erupting turbid gray water
4852 07 Aug 1980 @ 1800 --- research-mab 08/07/1980 (NOTE: not dated in log) BEAR DEN SUMMARY - (TV) Average duration: 2:10 Average # bursts: 11 Maximum # bursts: 18 Minimum # bursts: 7 Maximum duration: 2:28 Minimum duration: 0:56 Avg. Intr. Between bursts: 9:49 Minimum variance: +15.5, -7.5 Avg intr between eruptions: 2:34:50 Maximum variance +0:06:01, -3:28 Avg Intr between steam: 2:36:54 Max. Variance: +3:54, -4.57 Avg Intr. Steam-erupt: 1:15:17 Max Variance +1:20, - 2:01 Avg Intr Erupt-steam: 1:17:49 Max variance +2:31, -1:15
4594 04 Aug 1980 @ 1100 --- research-mab Aug 4 1980 Ebony NOTE: after an eruption of Bear Den Ebony Geyser is quiet and then slowly builds up, making a chug[g]ing noise. This noise grows stronger and slows down from as high as 8’s a minute to 4-5 minutes before an eruption of Bear Den, Ebony will become totally quiet. Before a steam puff Ebony stops later, and not so completely 10-15 seconds before a steam puff Ebony may start to splash heavily inside the crater like a small eruption, and emit more steam
4975 12 Jun 1980 @ 1045 --- research-mab 06/12/1980 NOTE- there is conflicting info in Log: “Bear Den went again, sometime around 10:30-11:00 producing a interval between 1 ½ hrs to 2 hrs.” 1008 was inserted later from a different observer- with burst count seemed like a solid time. mab
5001 10 Sep 1979 @ 1800 --- research-mab 09/10/1979 Bear Den is apparently a more complicated geyser than we think. While standing at the vent dangling the thermometer into the cavern inside, Bear Den began a bubbling sound. I immediately ran away from the vent just in time to avoid a single 10’ splash. No other play, no water apparent even 10’ down. Perhaps it doesn’t like getting its throat tickled.
5007 25 May 1979 @ 1800 --- research-mab May 25 1979 Bear Den Seems quite active with eruptions maybe 3-4 hours apart.
5746 11 Aug 1974 @ 1800 --- research-mab 08/11/1974 Bear Den: active today
5732 20 Jul 1974 @ 1800 --- research-mab 07/20/1974 Bear Den active today.
6034 10 Jul 1973 @ 1800 --- research-mab 07/10/1973 Runoff channel from Bear Den was wet -- apparently it resumed eruptive activity without a large eruption of Ebony (or so it appears) {no time}
6011 12 Jun 1973 @ 1800 --- research-mab 06/12/1973 {no time} Bear Den had some warm H20 in run-off channel played only several minutes previous
6018 24 Apr 1973 @ 1500 --- research-mab 04/24/1973 Observations were ended after 300pm due to the poor visibility and wet conditions. The large rock which is now lying in front of the vent has seriously altered the style or character of Bear Den’s eruptions. They seem to be of shorter durations & less height. Boiling at depth could be heard from the vent for well over a minute after the last bursts- which is an unusually long time. Angle of play of the water bursts varied between 40 and 50º)
6016 23 Apr 1973 @ 0800 --- research-mab 04/23/1973 Bear Den Geyser played during the night, thus ending a period of about 50 hours of inactivity. {general a.m. time}
6205 22 Apr 1973 @ 0000 --- research-mab 04/22/1973 Bear Den has not played since Friday. {no time}
5972 21 Apr 1973 @ 0800 --- research-mab 04/21/1973 Bear Den: From the snow in the runoff channel it was apparent that Bear Den Geyser did not play at all last night. In addition its runoff channel remained dry all day today. This was due to the activity of Ebony. {no time-morning check}
5926 24 Mar 1973 @ 1800 --- research-mab 03/24/1973 Since it has been established during the previous weeks that Bear Den (except briefly while Ebony was active) and Feisty Geysers (currently) have intervals between eruptions which are normally no more than 8 hours – at the very most, it is no longer deemed necessary to replace markers in their runoff channels. Normal observations will be maintained on them with the other features to detect if their eruptive pattern changes however.
6485 11 Sep 1972 @ 1200 --- research-mab 09/11/1972 Bear Den, Dark Cavern, Africa. L. Whirligig, Blue, Fireball & Arsenic all have been observed in eruption this morning. {generic a.m. time}
6480 25 Jul 1972 @ 1100 --- research-mab 07/25/1972 BEAR DEN “No eruption until at least 11”
6355 24 Jul 1972 @ 1800 --- research-mab 07/24/1972 Bear Den erupted with 13 bursts – Ebony filled but no run-off {no time noted}
6348 08 Jul 1972 @ 1200 --- research-mab 07/08/1972 {No time- around noonish} Two visitors reported seeing Bear Den go off. In both cases they were watching Ebony build up then they noticed Bear Den began to play.
6319 08 Jun 1972 @ 1548 --- research-mab 06/08/1972 Africa, Bear Den, Ledge, L. Whirligig, Arsenic and Possibly Blue (crossed out “Iris”) were all erupting at the same time at 3:48
6500 15 May 1972 @ 1800 --- research-mab 05/15/1972 Bear Den – erupts as last year, several times daily, temp of steam in fissure 192º
6558 16 Jul 1971 @ 1005 16 Jul 1971 @ 1835 research-mab 07/16/1971 {markers replaced} Bear Den and Valentine 5:55p, Bear Den replaced 10:05, also at 6:35p
6550 30 Jun 1971 @ 0915 --- research-mab NOTE: Logs have frequent and specific daily or hourly notes of replacing markers - Ledge, Valentine, Guardian, Ebony and Bear Den. I will include only those that might indicate intervals. MAB 06/30/1971 Replaced Bear Den at 9:15 all others ok. Replaced Bear Den 1230
6549 24 Jun 1971 @ 1200 --- research-mab 06/24/1971 Bear Den channel clean in front of tile under trail, channel was full of water from an eruption sometime during the previous 15 minutes. {morning-no time}
6599 30 Aug 1970 @ 1800 --- research-mab 08/30/1970 Bear Den {markers} replaced 820, 1455, 1830
6615 21 Aug 1970 @ 1400 --- research-mab 08/22/1970 Bear Den and Ebony markers replaced – visitor reported seeing Ebony and Bear Den go early in afternoon 8-21 {time not noted}
6600 09 Aug 1970 @ 1800 --- research-mab 08/09/1970 Bear Den {markers} replaced 0820, 1115
6601 08 Aug 1970 @ 1800 --- research-mab 08/08/1970 Bear Den marker replaced 1105, 1545, 1835
6616 03 Aug 1970 @ 0810 03 Aug 1970 @ 1435 research-mab 08/03/1970 Ebony and Bear Den markers replaced 8:10. Ebony run-off channel still wet. Bear Den replaced 2:35pm
6602 26 Jul 1970 @ 1800 --- research-mab 07/26/1970 Bear Den markers replaced 0830, 1220, 1420, 1820
6591 26 Jun 1970 @ 1800 --- research-mab 06/26/1970 Bear Den {markers} replaced 8:45, 5:50
6592 25 Jun 1970 @ 1800 --- research-mab 06/25/1970 Bear Den replaced 08:20, 3:45, 6:35
6604 21 Jun 1970 @ 1800 --- research-mab 06/21/1970 Replaced Bear Den marker 0910, 1455
6603 18 Jun 1970 @ 1800 --- research-mab 06/18/1970 Bear Den markers replaced 0830, 1000, 1430, 1700
6586 03 Jun 1970 @ 1030 --- research-mab 06/03/1970 Bear Den replaced 10:30 and 4:30 NOTE: Markers checked several times a day – I will only include some that might have interval information -mab
7479 19 Sep 1968 @ 1530 --- research-mab 09/19/1968 Replaced markers on Ebony & Bear Den 3:30p Bear Den erupts several times a day. Most eruptions completely remove the marker below the Y formed by the runoff of Ebony & Bear Den. I think Ebony has been erupting less frequently than we have been led to believe this summer. We were under the impression that one marker would suffice, believing that Bear Den did not produce enough water to remove the large marker below the Y.
7109 10 Jul 1966 @ 1800 --- research-mab 07/10/1966 All afternoon Bear Den went after each interval of Ebony without fail (B.L.)
6888 21 Jun 1965 @ 1800 --- research-mab 06/21/1965 Bear Den – 15-25 minutes between intervals (25 ft)
6835 03 Aug 1964 @ 1800 --- research-mab 08/03/1964 Ebony had its first minor eruption today without Unnamed {Bear Den} playing Height 4 ft. duration 2 min {no specific time noted}
No attachments for this geyser.
Baseline does not exist.


All data is shown in US/Mountain timezone unless specified otherwise.

GeyserTimes.org is not affiliated with the National Park Service, but it is "for the benefit and enjoyment of the people".

If you have any questions or comments please contact: webmaster@geysertimes.org

Support open geyser data: Patreon Page

© Copyright 2011-2019

Facebook Page Telegram Channel Get it on Google Play Download on the App Store

Google Play and the Google Play logo are trademarks of Google LLC.

Apple and the Apple logo are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc., registered in the U.S. and other countries.