Last Known Eruption
42y 34d 23h 10m ago

Latest Eruptions

Eruption DurationInterval
25 May 1982 @ 2000 A352d 19h 47m
07 Jun 1981 @ 00137m 15s 34d 14h 43m
03 May 1981 @ 09302y 80d 18h 50m
12 Feb 1979 @ 1340 ie246d 2h 0m
11 Jun 1978 @ 124012m 59d 11h 40m
13 Apr 1978 @ 0000 A34d 14h 14m
09 Mar 1978 @ 09464m 194d 13h 15m
26 Aug 1977 @ 213119d 11h 46m
07 Aug 1977 @ 094548d 14h 15m
19 Jun 1977 @ 19305m 300d 9h 55m
23 Aug 1976 @ 093521d 9h 48m
01 Aug 1976 @ 234749d 3h 2m
13 Jun 1976 @ 20454d 17h 45m
09 Jun 1976 @ 0300 A12d 13h 6m
27 May 1976 @ 13544d 18h 54m
22 May 1976 @ 1900 A339d 2h 0m
18 Jun 1975 @ 1700 A11d 6h 59m
07 Jun 1975 @ 10014d 22h 36m
02 Jun 1975 @ 11254d 4h 20m
29 May 1975 @ 07054d 8h 5m
24 May 1975 @ 2300 A293d 14h 15m
04 Aug 1974 @ 08455m 50d 17h 0m
14 Jun 1974 @ 15458m 2d 22h 45m
11 Jun 1974 @ 1700 A11d 19h 5m
30 May 1974 @ 21558d 7h 25m
22 May 1974 @ 14305y 274d 23h 30m
21 Aug 1968 @ 15001y 44d 15h 0m
09 Jul 1967 @ 0000 A16d 1h 35m
22 Jun 1967 @ 2225 ie9d 7h 10m
13 Jun 1967 @ 1515 A284d 2h 25m
02 Sep 1966 @ 125014d 22h 1m
18 Aug 1966 @ 14494d 4h 49m
14 Aug 1966 @ 10004d 18h 10m
09 Aug 1966 @ 15501y 47d 4h 30m
23 Jun 1965 @ 1120 min1y 35d 11h 5m
18 May 1964 @ 2315 ?

Interval Statistics

Interval Count35
Min2d 22h 45m
Max5y 274d 23h 30m
Mean188d 33m
Median34d 14h 14m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
28293 17 Sep 2023 @ 0826 --- SantaFe108 Steaming and grumbling, air temp ~35° F.
27277 28 Jul 2023 @ 1240 --- SantaFe108 Quietly steaming.
26496 20 Jun 2023 @ 0656 --- SantaFe108 Steaming with low grumbling. Air temp 37° F.
21036 18 Apr 2022 @ 0929 --- MAB quiet steam - 32° air temp
16952 28 Apr 2021 @ 0923 --- MAB steamy- audible grumbles
5377 01 Feb 1995 @ 1800 --- research-mab 02/01/1995 Harding geyser is full of water and boiling heavily all along the vent. Temp is 100ºC. Occasionally it will surge and overflow slightly. It will be interesting to see if this activity is just disturbance related or an indication of increasing activity.
30703 09 Jul 1989 @ 1200 --- research-mab 7/9/1989 - no time noted - Harding Geyser behaving like a fumerole. Subsurface boiling is audible.
30840 14 Aug 1988 @ 1200 --- research-mab 8/14/1988 - no time noted - Harding Geyser continues to be a gently steaming fumerole in the trees this summer. An alarmed visitor mistook it for a beginning forest fire last week.
33469 02 May 1987 @ 1200 --- research-mab May 2, 1987 - no time noted - Harding Geyser– No change.
33463 26 Apr 1987 @ 1200 --- research-mab 04/26/1987 – no time noted - .Harding Geyser– The pool in Harding was about 15 inches below overflow, and a loud and extremely vigorous boil was 1 – 2 feet above the basin. Some small surges could be seen from the paved trail.
33462 12 Apr 1987 @ 1200 --- research-mab 04/12/1987 – no time noted - ..brief stop at Norris- Harding Geyser– No change except for no overflow.
33460 04 Apr 1987 @ 1200 --- research-mab 04/04/1987 – no time noted - Harding Geyser– No change from March 15 observation.
33451 15 Mar 1987 @ 1200 --- research-mab March 15, 1987 - no time noted - Harding Geyser– As I was approaching the museum, I could hear a large splashing coming from Harding. The pool was full and very, very slightly overflowing. A rather vigorous boil over the main vent was reaching 2-3 feet high. When I returned 6 ½ hours later, the crater was still acting this way.
31069 20 May 1983 @ 1200 --- research-mab May 20 1983 - no time noted - Disturbance!... Harding – water 2-2 ½ feet down in the vent boiling vigorously
31066 15 May 1983 @ 1200 --- research-mab May 15 1983 - no time noted - Harding - no definite signs of an eruption but the water is down about a foot from the top of the vent. Down considerably from May 12.
31064 12 May 1983 @ 1200 --- research-mab (May 12 83) - no time noted - Harding- Full and splashing 1-2 feet.
31260 18 May 1982 @ 1200 --- research-mab May 18 1982 - no time - Harding full & bubbling 1 ½ ft
4662 14 May 1982 @ 0000 --- research-mab 5/14/1982 - no time - Harding Geyser – very full bubbling 1-2 ft
31258 20 Feb 1982 @ 1200 --- research-mab February 20 1982 - no time noted - Harding Geyser 200º Marker 4’ from where it has been placed so possibly Harding has had an eruption in the past month. Light blue, slightly turbid H20 splashing 1 ½-2 feet.
31192 15 Jan 1982 @ 1200 --- research-mab January 15th, 1982 - no time noted - Harding Geyser – 198º water level 6” from overflow point, blue-gray H20 splashing vigorously 2-3’
31587 11 Dec 1981 @ 1200 --- research-mab Dec 11 1981 - no time noted - Harding Geyser 202º water level down 3 ½’ from vent. Marker is still in place so it has been since early July since an eruption occurred… ever since they stopped blasting….
31790 22 Sep 1980 @ 1200 --- research-mab Monday Sept 22, 1980 - no time noted - One week following the disturbance, some porcelain basin observations: Harding Geyser – boiling about 3 feet down, 203ºF
31717 23 Aug 1980 @ 1200 --- research-mab Saturday August 23 - no time noted - Harding Geyser- Fetid odor, boiling out of sight down vent. 203°F. Marker stick placed over vent.
31661 17 Jul 1980 @ 1200 --- research-mab July 17, 1980 - no time noted - Harding Geyser – Boiling with a rumble deep within its crater. Bad smell (sewage seepage?) 203ºF
31628 09 Jun 1980 @ 1200 --- research-mab June 9 1980 - no times - observations made over the week, entered on 9th - Harding Geyser – Full of water and chugging the last few days, 20xºF
32250 14 Dec 1978 @ 1200 --- research-mab Thursday December 14 1978 - no time noted - Rick H - Harding Geyser dormant, water level down 60 cm & boiling vigorously
4957 19 Jul 1978 @ 2327 --- research-mab 07/19/1978 Harding – boiling hard 2327!
32076 02 Apr 1978 @ 1200 --- research-mab April 2 1978 - no time noted - Temp. of Harding Geyser – 204º- lots of water boiling.
32041 10 Mar 1978 @ 0730 --- research-mab March 10 1978 - Water can be heard (barely) at depth in Harding Geyser at 730.
5524 21 May 1976 @ 0900 --- research-mab 05/21/1976 Marker placed on Harding washed away, must have erupted during the night.
5718 19 Jul 1974 @ 1800 --- research-mab 07/19/1974 Harding – very active , water splashing to near top of vent {no specific time}
32702 23 Jun 1974 @ 0900 --- research-mab 06/23/1974 - presumed morning time - Harding marker OK, boiling violently
32701 22 Jun 1974 @ 0855 --- research-mab 06/22/1974 Harding quite active water spouting near top of vent 0855
5976 29 Apr 1973 @ 1800 --- research-mab 04/29/1973 Harding Geyser – water level covered rocks in vent with up to 2 inches of vigorous boiling – highest it has been all spring.
5968 17 Apr 1973 @ 1800 --- research-mab 04/17/1973 Harding Geyser – the boiling from its vent (east of the museum) can easily be heard from the door of the living quarters. Intermittent bursts in the form of a light spray are frequently playing up to 4 feet in height.
6503 15 May 1972 @ 1800 --- research-mab 05/15/1972 Harding Geyser – water level up to surface but very little runoff, boiling vigorously, clear water 198º
33146 15 May 1972 @ 1200 --- research-mab 1972 – May 15 - no time - 198F No water from the vent, just steam.
6570 11 Sep 1971 @ 1800 --- research-mab 09/11/1971 Harding Geyser 196º (down 4º 7/31/71) churning water 3’ below top of vent {temps taken 1430-1700}
33145 31 Jul 1971 @ 1200 --- research-mab 1971 July 31 - no time -No change – just steam (200F)
33144 22 Jun 1969 @ 1200 --- research-mab 1969- June 22 Harding has had no geyser activity at all this spring. The drainage from Harding looks like it has not been used since last summer water down about a foot – 200°F
7409 22 Aug 1968 @ 1800 --- research-mab 08/22/1968 Water running down channels of Harding, but Harding wasn’t overflowing when I walked up to check on it. {no specific time noted}
7400 18 Jun 1968 @ 1800 --- research-mab 06/18/1968 Harding played sometime today.
7431 08 Jun 1968 @ 1145 --- research-mab 06/08/1968 Harding overflowing at 11:45 am
7374 27 Oct 1967 @ 0800 --- research-mab 10/27/1967 Harding – no eruption since last notation. Water down 2 ft and very active.
7370 10 Oct 1967 @ 0800 --- research-mab 10/10/1967 Harding – may have played. Both markers gone – some erosion uphill. H2O is way down, doesn’t smell quite as bad.
7310 02 Aug 1967 @ 0945 --- research-mab 08/02/1967 Harding water level back below vent about 1 ft. All marker intact 945
7309 01 Aug 1967 @ 0800 --- research-mab 08/01/1967 Harding did not erupt during night. Water level back down.
7302 31 Jul 1967 @ 2025 --- research-mab 07/31/1967 At 8:25 pm Harding was full to the point of overflowing and quite active.
7391 31 Jul 1967 @ 2025 --- research-mab July 31 8:25pm Water level high - near overflowing – active.
7393 24 Jul 1967 @ 0915 --- research-mab July 24 915a, Water has dropped down – still boiling hard but no eruption.
7392 19 Jul 1967 @ 1345 --- research-mab July 19 Vent boiling over – heavily agitated, marker intact 811am 202º at 1:45p
7280 18 Jul 1967 @ 1845 --- research-mab 07/18/1967 Harding full and active at 6:45 pm – water puddled in rocks just above the geyser vent may be left over from rain.
7278 06 Jul 1967 @ 0815 --- research-mab 07/06/1967 Harding H2O level down out of sight – sounded like a steam phase but markers were intact 8:15 am
33143 29 Jun 1967 @ 1200 --- research-mab June 29, - no time - 202°F and a ph of 5 at 110°F
7267 22 Jun 1967 @ 0800 --- research-mab 06/22/1967 Harding vent full & active but marker intact.
7303 19 Jun 1967 @ 0800 --- research-mab 06/19/1967 Harding vent full and active; placed marker.
7390 18 Jun 1967 @ 0800 --- research-mab June 18 placed marker – vent full & active
33142 13 Jun 1967 @ 0800 --- research-mab June 13, 1967 At 8:00 the water was up into the basin. Harding played about 3:15 pm. I did not see the water. Located East of the museum. The vent is about 8 to 11” wide and 3/5 feet long. The water is a light white in color. The water drains down into the Valentine alcove.
7249 07 Sep 1966 @ 0800 --- research-mab 09/07/1966 Harding Splashing to surface
7242 04 Sep 1966 @ 0800 --- research-mab 09/04/1966 Harding Water splashing visible 3’ below surface.
7238 03 Sep 1966 @ 0800 --- research-mab 09/03/1966 Harding Very quiet this morning.
7236 02 Sep 1966 @ 0800 --- research-mab 09/02/1966 Harding Very much agitated @ 8am.
7234 01 Sep 1966 @ 0800 --- research-mab 09/01/1966 Harding Water level above surface slightly & splashing vigorously.
7226 30 Aug 1966 @ 0800 --- research-mab 08/30/1966 Harding vent level one foot down & active
7222 29 Aug 1966 @ 0930 --- research-mab 08/29/1966 Harding full and boiling excitedly at 9:30 am
7215 26 Aug 1966 @ 0800 --- research-mab 08/26/1966 Harding – Splashing vigorously
7213 25 Aug 1966 @ 0800 --- research-mab 08/25/1966 Harding – nothing during night – H2O down 3 ft.
7206 24 Aug 1966 @ 0920 --- research-mab 08/24/1966 Harding – H2O down 2 feet – splashing as high as vent at 9:20 am.
7203 23 Aug 1966 @ 1155 --- research-mab 08/23/1966 Harding – Splashing out of vent, H2O down about one foot. Temp 202º @ 11:55am – splashing.
7202 22 Aug 1966 @ 0000 --- research-mab 08/22/1966 Feisty – 1025a Temperatures 212ºF, the hottest I have measured on any feature in Norris in 3 years except for Harding which was once checked out at 215ºF {First mention of Feisty in this log - mab}
7201 21 Aug 1966 @ 0830 --- research-mab 08/21/1966 Harding – Marker intact at 8:30a. No H2O visible.
7197 20 Aug 1966 @ 1030 20 Aug 1966 @ 1320 research-mab 08/20/1966 Harding – Vent full of muddy water – slight fluctuation. Temp 178º, @ 10:30 water level still up boiling vigorously. Temp 201º, 1:20 pm water down below surf. but splashing wildly.
7194 19 Aug 1966 @ 0800 --- research-mab 08/19/1966 Harding Marker replaced. Very quiet this morning.
7191 18 Aug 1966 @ 1130 --- research-mab 08/18/1966 Harding – boiling heavily – water one to two feet out of vent 11:30am. Erupted 2:49 (in rain)
7188 17 Aug 1966 @ 0810 --- research-mab 08/17/1966 Harding – violent sloshing inside; nothing visible. 8:10 a.m.
7185 16 Aug 1966 @ 1445 --- research-mab 08/16/1966 Harding – Quiet {a.m.}. Gurgling strongly @ 245pm
7183 15 Aug 1966 @ 0800 --- research-mab 08/15/1966 Harding – Quiet & serene. No H2O audible.
7175 12 Aug 1966 @ 0950 --- research-mab 08/12/1966 Harding Water splashing to just below vent opening – and occasionally above. Temp 201º 950am
7167 11 Aug 1966 @ 0800 --- research-mab 08/11/1966 Harding - No action during night. Sound of water splashing nearer surface- smell of cooking wood still very strong in area. Steam from Harding smells of it.
6641 04 Jun 1964 @ 0800 --- research-mab 06/04/1964 Water level in Harding down. Pool NE of Ledge milky, overflow has stopped. {AM-no time}
6642 03 Jun 1964 @ 0800 --- research-mab 06/03/1964 Harding Geyser Crater filled during the night. {AM -no time}
6636 31 May 1964 @ 1800 --- research-mab 05/31/1964 Harding Geyser low – lost most water.
6633 17 May 1964 @ 1200 --- research-mab 05/17/1964 Harding Geyser may have erupted few feet at at some time. Temp at 12:00 pm was 200ºF. Water level still up
6632 17 May 1964 @ 0800 --- research-mab 05/17/1964 Temperature at Harding Geyser 202ºF. Water level up. {am}
6635 16 May 1964 @ 1800 --- research-mab 05/16/1964 Harding Geyser water level dropped on 9 May. Has filled up again today to point of about overflowing.
No attachments for this geyser.
Baseline does not exist.