| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 21288 |
15 May 2022 @ 1410 |
15 May 2022 @ 1420 |
mwolf |
small bursts every few minutes |
| 21205 |
06 May 2022 @ 1054 |
--- |
MAB |
channel green |
| 20180 |
28 Oct 2021 @ 0844 |
--- |
MAB |
channel below Pinwheel a striking dark green - a few white stripes immediately below small features but green returns asap and continues til it meets Whirligig runoff at the BW bridge just above the logger |
| 20001 |
16 Oct 2021 @ 1338 |
--- |
cb |
Run off channel is back to mostly green color |
| 19232 |
01 Sep 2021 @ 0902 |
--- |
MAB |
more green returning in center of channels not just edges - still very dark green upstream of Pinwheel's vent |
| 18761 |
31 Jul 2021 @ 1500 |
--- |
MAB |
After a heavy rain Pinwheel runoff changed to pea soup color - then to pistachio ice cream color - then to bad 2% milk color - during the deluge these colors were visible above Pinwheel - after waters went down more pronounced below Pinwheel |
| 18769 |
31 Jul 2021 @ 0845 |
--- |
MAB |
dark green above Pinwheel vent - more green growing on edges of channel farther down - center channels still white with tiny flecks of green |
| 18667 |
25 Jul 2021 @ 1819 |
--- |
cb |
Edges of the pool are not green, they are muddy gray and pool is low by 4". Runoff channels are basically still white with more green algae on the sides than last observed. |
| 18472 |
14 Jul 2021 @ 1720 |
--- |
MAB |
Channel still white with faint green developing in some spots along edges and past the boardwalk - very green above Pinwheel's vent area - nothing upstream has pushed out hot water |
| 17861 |
16 Jun 2021 @ 0850 |
--- |
novakg |
Pinwheel runoff continues to be scoured white. |
| 17839 |
15 Jun 2021 @ 0840 |
--- |
novakg |
Laurie reports that Pinwheel's runoff channel has been scoured of the green stuff and is now white. |
| 17543 |
07 Jun 2021 @ 0903 |
--- |
MAB |
channel still green above and below Pinwheel - but there are some whitish spots farther down |
| 14544 |
05 Jun 2020 @ 0903 |
--- |
bbev |
Tall, billowing, steam column coming from Pinwheel area. Normally green runoff channel coming from that area, now a brilliant white. Runoff under boardwalk mostly white, having taken even some of the red out of Whirligig's channel. |
| 12926 |
01 Aug 2019 @ 1230 |
01 Aug 2019 @ 1530 |
cb |
copious discharge coming from the pinwheel area and above it that is starting to change the runoff channel color to a pockmarked light green. No eruption seen. |
| 11586 |
04 Jun 2019 @ 1321 |
04 Jun 2019 @ 1517 |
novakg |
From at least 1321 until 1517 when we left, the area near Pinwheel was "blooping," for lack of a better word. These could be seen above the bern from the Constant bench and would slightly increase the runoff from that direction. |
| 11027 |
20 Apr 2019 @ 0930 |
--- |
MAB |
Water in runoff channel slightly murky, probably from features upstream of Pinwheel but worth mentioning. |
| 10722 |
04 Nov 2018 @ 0954 |
--- |
MAB |
Definite convection over the vent. Earlier this summer noticed the white below Pinwheel never grew back after the July eruption - now with the algae dark dark dark DARK green the white stripe is is very pronounced. Water entering from above is green. |
| 3308 |
14 Jul 2016 @ 1040 |
--- |
MAB |
Runoff continues in formerly dry 3rd (west) channel. 60C and green is not returning until downstream of Splutterpot. The increased flow may be from Sand Spring but that channel above Pinwheel's crater is still dark green. |
| 3017 |
08 Jun 2016 @ 1500 |
08 Jun 2016 @ 2000 |
MAB |
Pinwheel runoff brighter white, twigs wet and moved, some water in 3rd (west) runoff channel. Basin had been closed due to thermal death incident, but I will ask staff if they had seen anything out of Pinwheel since the 5th when things are calmer. |
| 2484 |
05 Oct 2015 @ 1055 |
--- |
MAB |
Steamy morning. Upon arrival 1030 water was flowing in the 3rd (west) runoff channel and the flat sinter spot was half-wet and debris moved to the east. Just before 1055 I noticed increased steam and runoff, and saw the flat sinter spot was submerged. A push from Pinwheel, or something else upstream? Too steamy to tell, but it's worth watching. Though I saw that flow increase, green is growing back in the 2 easterly channels. |
| 2399 |
21 Sep 2015 @ 0940 |
--- |
MAB |
Flat sinter area in westerly runoff channel, my visual 'marker' (not the formerly green and not with water currently flowing) was wet upon arrival, and dried off and remained dry the rest of the day. Convection seen in the pool later in the warmth of day at 1352 and 1625 (the times I looked, not implying that's the only time it had convection) |
| 2376 |
18 Sep 2015 @ 1151 |
--- |
MAB |
Slight convection in the vent observed all day when visiting this spot. I left to go watch Graceful and get the end. Upon my return the runoff was cloudy, and a previously dry area in the most westerly runoff channel (not the ones usually green) was wet. It was dry again by afternoon. Unknown if this came from a Pinwheel push or from that thing upstream around the corner. I include the time here in case we see it on YVO, but (!) Whirligig started right after that, so will probably be indistinguishable. |
| 2355 |
15 Sep 2015 @ 0948 |
15 Sep 2015 @ 1748 |
MAB |
Lots of water coming through the pool from above on a rainy steamy day. Slight convection in the vent and a few blips were observed in late afternoon 1548,1735. I will observe the spouter around the corner and watch for lulls to see how the Pinwheel pool looks then. No sign of green regrowth in the runoff channel. |
| 7627 |
11 Feb 1984 @ 1800 |
--- |
research-mab |
02/11/1984
Pinwheel Geyser - Slowly being filled with sediment, slightly turbid, dark green algae present. |
| 4621 |
29 Sep 1980 @ 1800 |
--- |
research-mab |
9/29/1980 Pinwheel Geyser was likewise drained and considerably hotter- water level was down 16 inches temp 195 -There was absolutely no water flowing into or out of Pinwheel |
| 4613 |
22 Sep 1980 @ 1800 |
--- |
research-mab |
9/22/1980 Pinwheel Dark gray, turbid, and gently bubbling from close to a dozen locations, small amount of water flowing in and out at 10:30. By 11:10 Pinwheel had drained serving as a receptacle for water flowing from northern portions of Porcelain Basin. |
| 5023 |
17 Jun 1979 @ 1400 |
--- |
research-mab |
06/17/1979 By 1400 this afternoon Pinwheel had cleared up considerably and was no longer boiling up. Blue Geyser back in operation by 1345 |
| 5022 |
17 Jun 1979 @ 1015 |
--- |
research-mab |
06/17/1979 Pinwheel may be reactivating. The pool is very muddy, with increased overflow and periodic boiling several inches high. Must keep an eye on Pinwheel. Periodically splashing up to 2’ |
| 5120 |
06 Sep 1977 @ 1200 |
06 Sep 1977 @ 1730 |
research-mab |
09/06/1977 The drain-fill cycle of Pinwheel is related to the drain-fill-erupt pattern of Blue Geyser. At ~1200 Blue was erupting & Pinwheel was full. At 1730 Blue was drained & Pinwheel was losing water. |
| 5127 |
29 Aug 1977 @ 1800 |
--- |
research-mab |
08/29/1977 Pinwheel Geyser is drained down about a foot or so that there is no runoff and only a small amount of incoming water. |
| 5118 |
21 Aug 1977 @ 1800 |
--- |
research-mab |
08/21/1977 After the influx of water comes the lack of water in Sand Spring is no longer overflowing so less water is draining into Pinwheel. More water flows out of Pinwheel than is flowing in. |
| 5558 |
21 Jul 1976 @ 1520 |
21 Jul 1976 @ 1600 |
research-mab |
07/21/1976 Pinwheel shows increased activity this p.m. Large splashes witnessed from 3:20 to nearly 4:00. |
| 5561 |
14 Jul 1976 @ 1800 |
--- |
research-mab |
07/14/1976 Pinwheel geyser was bubbling to a height of 2’. It seems to be loosing its algal bed. Also rocks have been thrown in this area. |
| 5541 |
06 Jul 1976 @ 1800 |
--- |
research-mab |
07/06/1976 Pequito has been acting in its usual pattern while Pinwheel has been ejecting more silt & rather vigorous bubbling. |
| 5539 |
30 Jun 1976 @ 0845 |
--- |
research-mab |
06/30/1976 {Pequito erupting....} Eroded channels near boardwalk were dry, but Pinwheel was splashing away and emitting loud popping sounds. |
| 5532 |
25 Jun 1976 @ 1230 |
--- |
research-mab |
06/25/1976 Pinwheel -- renewed activity. Small eruptions were coming from main vent during Little Whirligig 1230 (Time approximately 1230) |
| 5701 |
07 Sep 1975 @ 1800 |
--- |
research-mab |
09/07/1975
Pinwheel continues to fluctuate, sometimes overflowing other times not. |
| 5692 |
31 Aug 1975 @ 1800 |
--- |
research-mab |
08/31/1975 Runoff channel from Pinwheel full of water at 0845 but dry about noon. |
| 5663 |
29 Aug 1975 @ 1800 |
--- |
research-mab |
08/29/1975 Noticeable decrease in amount of runoff from Porcelain Basin.
Channel from Pinwheel Geyser almost dry. |
| 5766 |
16 Aug 1974 @ 0830 |
--- |
research-mab |
08/16/1974 Pinwheel 0830 bubbling w/ runoff from Blue. |
| 5759 |
15 Aug 1974 @ 1800 |
--- |
research-mab |
08/15/1974 Pinwheel erupting to 6’ in pm |
| 6100 |
05 Sep 1973 @ 1845 |
--- |
research-mab |
09/05/1973 P.B. at 6:45 - runoff extending from Sieve Lake into Pinwheel G |
| 6095 |
04 Sep 1973 @ 1000 |
--- |
research-mab |
09/04/1973 Blue Geyser still sending off much runoff which increases runoff into/out of Pinwheel (which shows more runoff into than yesterday-) also a little more drainage from the N ← not from Sand Spring. |
| 6061 |
29 Aug 1973 @ 1800 |
--- |
research-mab |
08/29/1973 Pinwheel→ no runoff into it. |
| 6103 |
28 Aug 1973 @ 1800 |
--- |
research-mab |
08/28/1973 Water once again draining into Pinwheel G. & quite a bit (though not normal) of water in its runoff channels. |
| 6085 |
26 Aug 1973 @ 1800 |
--- |
research-mab |
08/26/1973 – still no runoff into Pinwheel |
| 6083 |
25 Aug 1973 @ 1800 |
--- |
research-mab |
08/25/1973 No water draining into Pinwheel-→ still it is not erupting. Sign Change !! |
| 6078 |
22 Aug 1973 @ 1800 |
--- |
research-mab |
08/22/1973 Sand Spring, north of Pinwheel Geyser ceased runoff water (probably) this afternoon, its runoff channel is dry red-iron; this change has markedly decreased the runoff water into Pinwheel. |
| 6062 |
19 Aug 1973 @ 1800 |
--- |
research-mab |
08/19/1973 Pinwheel bubbling somewhat more violently than yesterday. |
| 6447 |
02 Sep 1972 @ 1800 |
--- |
research-mab |
09/02/1972
Pinwheel Geyser – is now full with most bubbling action ended
-a very little is continuing from a couple of the cracks in the bottom. Runoff through Pinwheel from Sand Spring & the small springs to the NE is almost completely back up to normal. |
| 6442 |
31 Aug 1972 @ 1800 |
--- |
research-mab |
08/31/1972
Water flowing back into Pinwheel Geyser |
| 6441 |
26 Aug 1972 @ 1800 |
--- |
research-mab |
08/26/1972
Water level down to lowest observed level so far in the Whale’s Mouth, while the pool of Pinwheel Geyser is almost refilled. (Bubbling action is present in 17 points in the base of the pool.) |
| 6421 |
23 Aug 1972 @ 1800 |
--- |
research-mab |
08/23/1972
Water is re entering Pinwheel Geyser again from springs to the N & NE but not from Sand Spring. |
| 6439 |
23 Aug 1972 @ 1800 |
--- |
research-mab |
08/23/1972
Water is re entering Pinwheel Geyser again from springs to the N & NE but not from Sand Spring. |
| 6419 |
20 Aug 1972 @ 1630 |
--- |
research-mab |
08/20/1972
Pinwheel empty at 4:30 |
| 6427 |
19 Aug 1972 @ 0800 |
--- |
research-mab |
08/19/1972
Water level in Porcelain Basin is continuing to drop-off
Pinwheel Geyser’s water level was down 12-13 inches at 8:00 as there was no water coming into it from Sand Spring. |
| 6438 |
18 Aug 1972 @ 1800 |
--- |
research-mab |
08/18/1972
Pinwheel at lowest level ever observed water level down 10-15” with absolutely no water running either in or out! {no specific time} |
| 6437 |
17 Aug 1972 @ 0940 |
--- |
research-mab |
08/17/1972
By 9:40 Pinwheel geyser full w/runoff. |
| 6436 |
17 Aug 1972 @ 0830 |
17 Aug 1972 @ 0930 |
research-mab |
08/17/1972
Pinwheel G with absolutely no runoff 8:30-9:30, however the small frying pans N of the enclosure at Pinwheel contain more water than has been observed there for the last three days. Temp=78.5º (when drained) |
| 6414 |
16 Aug 1972 @ 1530 |
16 Aug 1972 @ 1640 |
research-mab |
08/16/1972
Pinwheel – empty at 3:30 (no run off) – at least 4:40 |
| 6479 |
15 Aug 1972 @ 0800 |
15 Aug 1972 @ 1545 |
research-mab |
08/15/1972 Pinwheel G – full with normal discharge 8:00 AM {Down 1 inch 3:45pm) |
| 6390 |
13 Aug 1972 @ 1000 |
--- |
research-mab |
08/13/1972 By 10:00 Pinwheel was again full with almost normal amount of water flowing into and out of the pool. |
| 6380 |
11 Aug 1972 @ 1730 |
--- |
research-mab |
08/11/1972
Pinwheel Geyser had completely drained by 5:30 pm. |
| 6471 |
02 Oct 1971 @ 1800 |
--- |
research-mab |
10/02/1971 Pinwheel Geyser – water clear but only around 60% normal runoff. |
| 6515 |
26 Sep 1971 @ 1800 |
--- |
research-mab |
09/26/1971
The water levels and thermal activities are continuing to fluctuate abnormally. Pinwheel Geyser has drained again with the water level this morning 2 inches below the overflow point. In addition there is not as much water flowing into it as yesterday.
By afternoon Pinwheel was overflowing again since there is more discharge from the Sand Geyser area. |
| 6569 |
25 Sep 1971 @ 1800 |
--- |
research-mab |
09/25/1971
Pinwheel has regained its status of being “drowned” although the water level is still 1½ to 2” below normal; Sand spring to the north of it has runoff again and as a result so does Pinwheel, but not the full normal amount. RH |
| 6508 |
18 Sep 1971 @ 0900 |
--- |
research-mab |
09/18/1971 The water level in Pinwheel rose during the night and it is almost completely full now. {assumed morning time} |
| 6507 |
16 Sep 1971 @ 1800 |
--- |
research-mab |
09/16/1971 Since there is very little water draining into Pinwheel Geyser it has become almost empty. |
| 6512 |
14 Sep 1971 @ 1800 |
--- |
research-mab |
09/14/1971
Some new changes noted in Porcelain:
Pinwheel now acts like a drain, almost all water flowing into it’s basin disappears down vent, very little run-off, also has gray clay deposits. |
| 6584 |
09 Sep 1971 @ 1800 |
--- |
research-mab |
09/09/1971 At Pinwheel there was also an increase in the bubbling action but t was limited to a small (10 inch) area away from the deepest part of the submerged geyser. {evening obs} |
| 6868 |
07 Jun 1965 @ 1800 |
--- |
research-mab |
06/07/1965
H20 (cold) is running into both Constant & Pinwheel – it is doubtful that they are erupting. It seems to me that the activity in the Porcelain Basin is much increased from last year. Could be due to increased H20 supply. |
| 6802 |
30 Oct 1964 @ 1800 |
--- |
research-mab |
10/30/1964
Pinwheel has developed either a green mineral deposit or a green algal growth within the past few days. |
| 6799 |
24 Oct 1964 @ 1800 |
--- |
research-mab |
10/24/1964 Pinwheel & Constant are inactive. |
| 6782 |
23 Oct 1964 @ 1800 |
--- |
research-mab |
10/23/1964 Pinheel is overflowing but cold. |
| 6780 |
18 Oct 1964 @ 1800 |
--- |
research-mab |
10/18/1964 Pinwheel has dropped again. |
| 6769 |
16 Oct 1964 @ 1800 |
--- |
research-mab |
10/16/1964 Pinwheel is now overflowing. |
| 6755 |
10 Oct 1964 @ 1800 |
--- |
research-mab |
10/10/1964
Pinwheel is overflowing a very little. |
| 6742 |
09 Oct 1964 @ 1800 |
--- |
research-mab |
10/09/1964 Pinwheel is all but dry – no overflow – temperature 128º |
| 6713 |
05 Oct 1964 @ 1800 |
--- |
research-mab |
10/05/1964
Porcelain Basin observed from 3:30 pm to 4:30 pm
Pinwheel is unchanged from yesterday afternoon. |
| 6703 |
04 Oct 1964 @ 1800 |
--- |
research-mab |
10/04/1964 Pinwheel has gained a little was but is only 121ºF. |
| 6698 |
03 Oct 1964 @ 0800 |
--- |
research-mab |
10/03/1964
Pinwheel Geyser was drained at 8AM and remained that way all day. |
| 6832 |
06 Aug 1964 @ 1200 |
--- |
research-mab |
08/06/1964 Blue – erupted in morning. Therefore there was no activity out of Pinwheel or Splutter Pot. {generic AM time} |
| 6659 |
13 Jul 1964 @ 0800 |
13 Jul 1964 @ 1231 |
research-mab |
07/13/1964 The overflow water from Blue was emptying into Pinwheel, causing it to be very inactive. |
| 10807 |
01 Jul 1933 @ 0000 |
--- |
research-mab |
June 1933 Report: Pinwheel Geyser – no observed eruptions {NOTE first mention of Pinwheel found in the literature -mab} |