| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 39308 |
24 May 2025 @ 1218 |
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Stephen_Gemar |
Ledge Spring is down to the inner funnel of its crater. Occasional strings of bubbles issuing from a couple of different spots. |
| 38976 |
10 May 2025 @ 1105 |
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Janet Jones |
Clear, blue water filled the crater about half way. Lazy bubbles rising. |
| 37784 |
27 Oct 2024 @ 1440 |
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Janet Jones |
Fairly recent eruption - both side channels were 90% damp. Water was murky - not as clear as it was last week when I saw it. |
| 37563 |
13 Oct 2024 @ 1454 |
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Janet Jones |
Ledge was clear, blue and overflowing when I arrived. Damp spots in the overflow channel on the side indicate it's still active. No standing water though, and checking on it again at about 1545 showed no change. |
| 37265 |
29 Sep 2024 @ 1517 |
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Janet Jones |
Arrived at Ledge to find it heavily overflowing and looking like it was ready to erupt, but giving it 5 minutes, I decided to continue documenting the basin through photos. It appears Ledge is still active based on dampness in the runoff channels. When I checked on it again at 1603, the water level was still at the same point, but overflow had lessened. |
| 37111 |
21 Sep 2024 @ 1148 |
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Janet Jones |
While I did not wait for it to erupt, the dampness and standing water in small depressions in the overflow channel indicate it is still active. |
| 36853 |
07 Sep 2024 @ 1657 |
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kc |
Quick rise to overflow with vigorous boiling, pool dropped |
| 36852 |
07 Sep 2024 @ 1525 |
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kc |
Quick rise to overflow with vigorous boiling, pool dropped |
| 36851 |
07 Sep 2024 @ 1137 |
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kc |
Pool was erupting 1 to 2 feet for 40 seconds but runoff didn't reach back left runoff channel |
| 36708 |
02 Sep 2024 @ 1450 |
02 Sep 2024 @ 1715 |
Janet Jones |
I didn't really take any specific times as I was sharing information about West Thumb with a friend. The times listed here are an estimate of about when I was walking through the area, or in the area for 15-20 minute stretches. But...in three or four times that I went by, the runoff channel was sometime quite wet and the water level ranged from overflowing to below overflow. Everything indicates it was active today and my guess would be every 1-2 hours. |
| 36639 |
30 Aug 2024 @ 1654 |
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steve |
Runoff seen coming down the hill by Lakeshore from Ledge Spring |
| 36629 |
30 Aug 2024 @ 1053 |
30 Aug 2024 @ 1330 |
Graham |
In overflow with continuous bubbling over main vent. Eruption channels dry. There was no noticeable change in activity for 2h and no eruption. 1330 still no eruption as I left the basin. |
| 36472 |
19 Aug 2024 @ 1425 |
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Craigmon99 |
Overflow stage 1: 1425
Eruptive vent showing signs of life 1431
Overflow stage 2: 1436
Overflow stage 3: 1443 “glass ceiling level”
Eruptive vent was calm and nonexistent but came back 1444
After some fumbling around by the eruptive vent, eruption 1504 |
| 36471 |
19 Aug 2024 @ 1256 |
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Craigmon99 |
Eruptive vent boiling vigorously |
| 35752 |
06 Jul 2024 @ 1435 |
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Janet Jones |
Ledge appears to still be active based on damp areas in the runoff channel where it would only be wet with an eruption. |
| 35652 |
30 Jun 2024 @ 1102 |
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Janet Jones |
Standing water in the overflow channels that could only have water in them from an eruption. Still active. |
| 35526 |
24 Jun 2024 @ 1730 |
24 Jun 2024 @ 2035 |
Craigmon99 |
Walked up to heavy overflow and eruptive vent boiling.
1739 boiling ceased. Still in heavy overflow
1740 boiling over eruptive vent back on and strong.
1742 bowling ball diameter boil
1746 boil has weakened but pool level still looks good. Heavy overflow continues
1748 eruptive vent ceased. Central vent gently boiling. Heavy overflow continues
1752 eruptive vent boiling begins again. Overflow unchanged
1755 eruptive vent bowling ball sized and strong
1759 EV boil weakened substantially. Pool remains at good overflow.
1800 boil gone. Extremely windy out. Maybe effecting? Cannot say though
1803 EV on
1806 bowling ball sized heavy boil from EV
1810 EV boiling decrease drastically since heavy wind. Pool level still does increase with each push however.
1814 EV back on after blooping from central vent
1821 EV boil off. CV beginning gentle boil. For context, helicopter strong winds are in basin. One of the main directions however, is directly against the flooding action that starts at the beginning of an eruption.
1829 EV boil begins. Wind is lighter.
1831 Subaudible thumping sounds from Collapsing Pool
1835 EV Fail. Runoff remains heavy from main channel
1841 EV on.
1853 ev still on. Strong. Good push. Signs look good
1856 ev off. Spoke too soon!
1902 ev on
1912 ev off
1919 ev on
1925 ev off
1932 ev on
1930 ev off
1944 ev on
2021 ev still on variable. No eruption yet
2034 ev still on from last note. Heading out due to bugs and general hunger. Of note: Collapsing Pool’s overflow channel has water almost to boardwalk now. |
| 35515 |
24 Jun 2024 @ 0917 |
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Craigmon99 |
Pooling raising after last eruption. No overflow yet. Pool is pulsing upwards
0923 boiling has calmed, but pool continues to rise
0925: almost at overflow. Rolling boil in center occasionally
0927: overflow begins into main channel. Heavy push this time. No hesitance.
0929: heavy large splashy boil. Thought this was going to start eruption. Pool level dropped below overflow.
0931: pool continues bowling ball diameter boil. Still below overflow
0935: boil is still strong as if preeruptive but still below overflow
0940: boil weakening substantially over eruptive vent. Boil over central vent beginning and intermittent.
0956: in overflow. Light overflow
1000: medium overflow
1005: medium heavy overflow
1007: heavy overflow (both sides of far rock have flow) Occasional rolling boil from center continues. Nothing from eruptive vent since last mention
1010: convection from eruptive vent
1024: central vent more rolling boils. Eruptive vent a few bubbles seen but convection mostly
1029: central vent upwelling and rolling boil stronger
1034: eruptive vent boiling strong
1036: bowling ball size boil over eruptive vent |
| 35490 |
23 Jun 2024 @ 1043 |
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Janet Jones |
Ledge still below overflow. I left to document the lower section of the basin. |
| 35489 |
23 Jun 2024 @ 1029 |
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Janet Jones |
Ledge was below overflow, however water stood in many places in the wide area where water overflows when an eruption occurs - indicating it's possibly active. I went to finish photo documentation of the upper half with a plan to check back before documenting the lower half. |
| 34761 |
30 May 2024 @ 0909 |
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Graham |
In steady overflow and hot. No indication of eruption recently, washbarea is dry and lots of small decayed sinter. |
| 34501 |
10 May 2024 @ 1305 |
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Janet Jones |
Steady overflow with microbes growing in the overflow channel. Blue, clear water and bubbles rising steadily. Was there for five minutes with no change in behavior. |
| 26928 |
08 Jul 2023 @ 1556 |
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nails |
Many feet below overflow. Water is brown with some green color. Occasional bubbles. |
| 24243 |
05 Oct 2022 @ 1317 |
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WillBoekel |
not active has green bacteria growing around edge |
| 23357 |
23 Aug 2022 @ 0830 |
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Craigmon99 |
Bench in between collapsing spring and ledge spring wet. Rest of boardwalk dry |
| 16104 |
13 Sep 2020 @ 1205 |
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Graham |
Very low water level. inactive |
| 13721 |
16 Sep 2019 @ 1009 |
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Janet Jones |
Rangers at West Thumb reported that Ledge's water level started to drop last week and is now down further. When I arrived there today, it was still a clear hot blue color with bubbles rising, but the water level was about half full - a level it has been at often in the past. I did not stay to observe whether or not it might still be erupting from a lower pool. Percolating Spring was still overflowing and percolating away. Thermal features across the boardwalk (Thumb Geyser, "Waterfall," etc) had fewer microbes and slightly elevated water levels as compared to my last visit. |
| 13599 |
06 Sep 2019 @ 1320 |
06 Sep 2019 @ 1520 |
Graham |
In overflow with very small rise and fall in the pool level. No eruption. |
| 12531 |
19 Jul 2019 @ 1837 |
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User34 |
First overflow |
| 11475 |
01 Jun 2019 @ 1320 |
01 Jun 2019 @ 1530 |
Graham |
Starting overflow with periodic boiling about every 10 min. Still in overflow with slightly stronger boils at 1530. |
| 11201 |
10 May 2019 @ 1237 |
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Janet Jones |
It’s alive! Hot, full, boiling, and overflow channel is damp. |
| 10915 |
26 Jan 2019 @ 0945 |
26 Jan 2019 @ 1105 |
Graham |
Runoff area is washed. Pool rose from below overflow to overflow and boiling over the vent started after 1040. Could erupt any time. |
| 4537 |
25 Jul 2017 @ 1844 |
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JSJ |
Damp runoff areas. Didn't stay to watch for eruptions (boardwalk closed for construction). |
| 4123 |
23 May 2017 @ 0842 |
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Janet Jones |
Hot, full, boiling and the runoff channel is wet. Runoff channel carved all the way to the lower boardwalk. |
| 4101 |
19 May 2017 @ 1805 |
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Tara |
Looked post eruptive. |
| 15277 |
26 Aug 1996 @ 0000 |
26 Aug 1996 @ 2359 |
JarnoO |
erupted today |