Last Known Eruption
2h 15m ago
Predicted Next Eruption
Today at 2202 ± 25 minutes

Latest Eruptions

Eruption DurationInterval
12 Aug 2025 @ 16026h 19m
12 Aug 2025 @ 094312h 16m
11 Aug 2025 @ 2127 ie6h 18m
11 Aug 2025 @ 15096h 36m
11 Aug 2025 @ 083313h 22m
10 Aug 2025 @ 19116h 33m
10 Aug 2025 @ 1238 ie6h 4m
10 Aug 2025 @ 0634 ns12h 40m
09 Aug 2025 @ 1754 wc6h 38m
09 Aug 2025 @ 111620m 6h 25m
09 Aug 2025 @ 0451 ns wc6h 42m
08 Aug 2025 @ 2209 wc6h 44m
08 Aug 2025 @ 1525 wc6h 43m
08 Aug 2025 @ 084213h 19m
07 Aug 2025 @ 1923 wc6h 39m
07 Aug 2025 @ 12446h 34m
07 Aug 2025 @ 0610 A1d 8h 32m
05 Aug 2025 @ 2138 wc6h 6m
05 Aug 2025 @ 15326h 38m
05 Aug 2025 @ 0854 wc1d 1h 43m
04 Aug 2025 @ 0711 ie wc11h 54m
03 Aug 2025 @ 1917 ie5h 52m
03 Aug 2025 @ 13255h 55m
03 Aug 2025 @ 073012h 1m
02 Aug 2025 @ 19296h 42m
02 Aug 2025 @ 1247 ns6h 2m
02 Aug 2025 @ 0645 ns wc12h 26m
01 Aug 2025 @ 1819 ns6h 44m
01 Aug 2025 @ 11356h 13m
01 Aug 2025 @ 0522 wc6h 9m
31 Jul 2025 @ 231319m 33s 6h 9m
31 Jul 2025 @ 1704 wc20h 3m
30 Jul 2025 @ 21016h 40m
30 Jul 2025 @ 1421 ns6h 34m
30 Jul 2025 @ 0747 ie wc12h 59m
29 Jul 2025 @ 1848 ie wc13h 15m
29 Jul 2025 @ 0533 wc1d 56m
28 Jul 2025 @ 0437 ie wc6h 40m
27 Jul 2025 @ 2157 wc6h 33m
27 Jul 2025 @ 15246h 6m
27 Jul 2025 @ 0918 ns12h 43m
26 Jul 2025 @ 2035 wc6h 35m
26 Jul 2025 @ 140018m 6h 39m
26 Jul 2025 @ 0721 ns wc13h 16m
25 Jul 2025 @ 1805 wc6h 35m
25 Jul 2025 @ 113013h 12m
24 Jul 2025 @ 2218 wc1d 1h 58m
23 Jul 2025 @ 2020 ie wc5h 51m
23 Jul 2025 @ 1429 ie wc17h 35m
22 Jul 2025 @ 205412h 52m
22 Jul 2025 @ 0802 wc16h 45m
21 Jul 2025 @ 15176h 32m
21 Jul 2025 @ 084512h 12m
20 Jul 2025 @ 2033 wc6h 11m
20 Jul 2025 @ 14226h 31m
20 Jul 2025 @ 0751 ie wc13h 14m
19 Jul 2025 @ 1837 ie6h 30m
19 Jul 2025 @ 1207 ie6h 37m
19 Jul 2025 @ 0530 wc18h 13m
18 Jul 2025 @ 11176h 28m
18 Jul 2025 @ 0449 ie wc6h 55m
17 Jul 2025 @ 2154 wc6h 33m
17 Jul 2025 @ 15216h 5m
17 Jul 2025 @ 0916 wc13h 11m
16 Jul 2025 @ 20056h 11m
16 Jul 2025 @ 1354 ie6h 35m
16 Jul 2025 @ 0719 wc6h 9m
16 Jul 2025 @ 011019m 20s 6h 29m
15 Jul 2025 @ 18416h 4m
15 Jul 2025 @ 12376h 32m
15 Jul 2025 @ 0605 wc13h 8m
14 Jul 2025 @ 1657 min3m 6h 12m
14 Jul 2025 @ 1045~19m 13h 15m
13 Jul 2025 @ 21306h 31m
13 Jul 2025 @ 14596h 9m
13 Jul 2025 @ 0850 wc12h 41m
12 Jul 2025 @ 2009 wc6h 36m
12 Jul 2025 @ 133313h 27m
12 Jul 2025 @ 0006 ie6h 19m
11 Jul 2025 @ 174719m 6h 34m
11 Jul 2025 @ 11136h 35m
11 Jul 2025 @ 0438 wc11h 59m
10 Jul 2025 @ 1639 ie wc5h 36m
10 Jul 2025 @ 11036h 32m
10 Jul 2025 @ 0431 ie wc6h 42m
09 Jul 2025 @ 2149 wc6h 37m
09 Jul 2025 @ 15126h 27m
09 Jul 2025 @ 084519h 26m
08 Jul 2025 @ 13196h 40m
08 Jul 2025 @ 0639 wc13h 19m
07 Jul 2025 @ 1720 wc12h 49m
07 Jul 2025 @ 0431 ie wc12h 28m
06 Jul 2025 @ 16036h 37m
06 Jul 2025 @ 092613h 22m
05 Jul 2025 @ 2004 wc6h 8m
05 Jul 2025 @ 13566h 35m
05 Jul 2025 @ 0721 ns wc20h 1m
04 Jul 2025 @ 1120 A6h 38m
04 Jul 2025 @ 0442 ie wc6h 40m
03 Jul 2025 @ 2202 wc12h 46m

Interval Statistics

Interval Count100
Min5h 36m
Max1d 8h 32m
Mean9h 40m
Median6h 38m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
41028 12 Aug 2025 @ 1443 --- gmapel In overflow
40903 08 Aug 2025 @ 0811 --- EmilyW In overflow
40775 03 Aug 2025 @ 1225 --- Geyser Guy700 In overflow with boils over the vent
40755 02 Aug 2025 @ 1855 --- bhoppe Just had a false start/minor/whatever nomenclature you prefer. Copious amounts of steam at 1855 as viewed from Rocket. Lasted approx 2 minutes. No water in Cone at 1858
40721 01 Aug 2025 @ 1127 --- bhoppe Big boil in main vent followed by 2 large splashes out of the Old Window which stopped overflow. Overflow resumed at 1129
40439 17 Jul 2025 @ 0745 --- rbwhitaker Currently in overflow. (Not the start.)
40404 14 Jul 2025 @ 1721 --- rbwhitaker back in overflow after the minor earlier
40403 14 Jul 2025 @ 1711 --- rbwhitaker water back in the main vent after the minor. not in overflow yet.
40304 09 Jul 2025 @ 1325 --- Delta4Heavy85 In overflow
40276 07 Jul 2025 @ 0936 --- BrandonC In overflow
40153 30 Jun 2025 @ 0728 --- CraigC started overflow within last 10 minutes
40138 29 Jun 2025 @ 0634 --- CraigC already in overflow
40066 26 Jun 2025 @ 0650 --- CraigC went into overflow within last 10 minutes
39543 31 May 2025 @ 0910 --- CraigC in overflow
39520 30 May 2025 @ 0932 --- CraigC in overflow
39518 30 May 2025 @ 0856 --- CraigC no overflow yet
39459 29 May 2025 @ 0858 --- CraigC in overflow
39425 28 May 2025 @ 0801 --- CraigC in overflow
39420 28 May 2025 @ 0750 --- CraigC no overflow yet
39404 27 May 2025 @ 1300 --- CraigC in overflow
39388 27 May 2025 @ 0635 --- CraigC in overflow
39272 23 May 2025 @ 0744 --- SteveO In overflow.
38879 08 May 2025 @ 0926 --- ghost842 In overflow
38649 27 Apr 2025 @ 0640 --- ghost842 Overflow started around 0640
38635 26 Apr 2025 @ 1122 --- DanS Not in overflow yet
38238 05 Feb 2025 @ 1549 --- Pholli in overflow:]
38031 18 Dec 2024 @ 1252 --- K.Cooper already in overflow
37985 11 Dec 2024 @ 1034 --- mwolf In overflow
37694 23 Oct 2024 @ 1649 --- DaveM Riverside eruption was 1649wc. The 1622 event did not produce enough steam to be seen on the webcam. the 1649 steam cloud was quite large.
37461 09 Oct 2024 @ 1304 --- mrsteed overflow resumed
37455 09 Oct 2024 @ 1115 --- mrsteed In overflow. Overflow began around 11:10AM
37276 30 Sep 2024 @ 0856 --- ddshepard In overflow
37275 30 Sep 2024 @ 0815 --- ddshepard No overflow; Bison to left of geyser.
37229 28 Sep 2024 @ 1908 --- User34 Series of heavy splashing and jetting from left vent that lasted a little over a minute. Overflow ceased early on during this activity and then resumed at 1921 (p=13m)
37203 28 Sep 2024 @ 0948 --- Pholli still no overflow
37201 28 Sep 2024 @ 0829 --- ddshepard Not in overflow
37163 26 Sep 2024 @ 0845 --- Borg In moderate overflow
37161 26 Sep 2024 @ 0733 --- Borg Dry, no overflow
37152 25 Sep 2024 @ 1319 --- Negh Started boiling over
37134 24 Sep 2024 @ 1129 --- Borg Overflow began at 1129
36939 12 Sep 2024 @ 1630 12 Sep 2024 @ 1648 Borg In light overflow, began within last 15 min
36897 11 Sep 2024 @ 0839 --- Lizzysa In overflow
36814 06 Sep 2024 @ 1530 06 Sep 2024 @ 1600 Borg Overflow began at 345
36765 05 Sep 2024 @ 0905 --- CraigC started overflow within last 12 mins
36737 04 Sep 2024 @ 0817 --- CraigC started overflow
36724 03 Sep 2024 @ 1617 --- Borg Post-eruptive
36715 03 Sep 2024 @ 0923 --- CraigC in overflow already
36667 01 Sep 2024 @ 1234 --- SantaFe108 In overflow.
36655 31 Aug 2024 @ 0717 --- CraigC started overflow again after false start
36653 31 Aug 2024 @ 0700 --- CraigC false start, huge splashing from keyhole for 2 mins, then shut off
36651 31 Aug 2024 @ 0643 --- CraigC already in overflow
36623 30 Aug 2024 @ 1041 --- ge start of overflow
36609 29 Aug 2024 @ 0905 --- CraigC already in overflow
36607 29 Aug 2024 @ 0756 --- CraigC no overflow yet
36595 28 Aug 2024 @ 0631 --- CraigC already in overflow, very light
36564 27 Aug 2024 @ 0639 --- CraigC already in overflow
36551 26 Aug 2024 @ 0645 --- CraigC heavy steam plume, no overflow, probably post-eruptive
36524 24 Aug 2024 @ 0702 --- BrianR Already in overflow
36434 17 Aug 2024 @ 0947 --- RMichaels In overflow as I passed by.
36373 11 Aug 2024 @ 1327 --- mwolf in overflow
36363 11 Aug 2024 @ 0743 --- CraigC in overflow
36343 10 Aug 2024 @ 0646 --- CraigC in overflow
36342 10 Aug 2024 @ 0620 --- CraigC no overflow
36323 08 Aug 2024 @ 0944 --- CraigC in overflow
36322 08 Aug 2024 @ 0843 --- CraigC no overflow
36312 07 Aug 2024 @ 0752 --- CraigC in overflow
36311 07 Aug 2024 @ 0730 --- CraigC no overflow
36297 06 Aug 2024 @ 0617 --- CraigC started overflow within last 15 minutes
36289 05 Aug 2024 @ 1040 --- CraigC in overflow
36288 05 Aug 2024 @ 1024 --- CraigC no overflow yet
36242 03 Aug 2024 @ 0742 --- CraigC in overflow
36233 02 Aug 2024 @ 2015 --- bhoppe first boiling water visible in MV at 2008. crater is gradually filling with water again. overflow began again at 2015
36232 02 Aug 2024 @ 2002 --- bhoppe Riverside's "Old Main Vent" put out quite a bit of water nonstop for about 75 seconds and totally killed any overflow from the real Main Vent. Almost like it would during a real eruption of Riverside just without the actual eruption of Riverside. Will upload video within a couple days
36100 25 Jul 2024 @ 1054 --- EmilyW In overflow
36091 25 Jul 2024 @ 0643 --- PamM Not in overflow
36069 24 Jul 2024 @ 0931 --- Polly Already in overflow
36038 22 Jul 2024 @ 1923 --- sierrarx overflow stopped for ~30 seconds
36037 22 Jul 2024 @ 1909 22 Jul 2024 @ 1911 sierrarx splashes out of "back" of chair followed by a surge out of main vent. Overflow completely stopped for 2 minutes before restarting
35853 11 Jul 2024 @ 1433 --- Delta4Heavy85 Start of Overflow 1433, 1st Boils 1445
35697 03 Jul 2024 @ 0820 --- CraigC in light overflow
35672 02 Jul 2024 @ 0709 --- CraigC started overflow within 5 mins
35629 30 Jun 2024 @ 0637 --- CraigC in overflow
35616 29 Jun 2024 @ 1022 --- Dave from B Overflow started in the last 10 minutes
35585 27 Jun 2024 @ 0703 --- CraigC in overflow
35566 26 Jun 2024 @ 0608 --- CraigC in light overflow
35508 24 Jun 2024 @ 0834 --- CraigC in overflow
35443 22 Jun 2024 @ 1250 --- CraigC in overflow
35305 18 Jun 2024 @ 1240 --- aferrara Boiling, overflowing, weak and intermittent keyhole
35255 16 Jun 2024 @ 1547 --- Forestbewithyou In overflow and doing some small splashing at times but variable.
35161 13 Jun 2024 @ 0704 --- JimS Already in overflow at this time
35138 12 Jun 2024 @ 0721 --- Art Already in overflow
34988 08 Jun 2024 @ 1137 --- RMichaels Entered overflow at 1137.
34862 03 Jun 2024 @ 1223 --- Graham In overflow
34788 31 May 2024 @ 1609 --- Stephen_Gemar Post eruptive. Just steaming; no overflow or boiling.
34678 26 May 2024 @ 0637 --- CraigC in overflow
34650 24 May 2024 @ 0639 --- CraigC in good overflow
34565 15 May 2024 @ 1138 --- ghost842 In strong overflow
34499 10 May 2024 @ 1103 --- jkgood In overflow
34468 06 May 2024 @ 1724 --- Paul Wheeler Awesome
34309 22 Apr 2024 @ 1009 --- DanS In overflow
EntrySourceLinkComment
31 May 2025 @ 0437 Joe   https://youtu.be/FNVoOTTZTeI video
22 Jul 2020 @ 1328 JSJ https://www.youtube.com/watch?v=DD6WNhycERw 4 minute video of eruption.
17 Jul 2020 @ 0826 JSJ https://www.youtube.com/watch?v=4nQk8faybk8 Video of Riverside Geyser's morning eruption on 17 July 2020.
24 Oct 2019 @ 0825 JoeN https://youtu.be/9zd4Sn1BbIE r-side video
24 Oct 2019 @ 0825 JoeN https://i.imgur.com/yAycpXd.png picture
17 Sep 2019 @ 0807 JoeN https://i.imgur.com/qav7bhe.png one shot pic
06 Jun 2018 @ 1346 JSJ https://www.flickr.com/photos/jsjgeology/28208979037 Photo (out of 3) of Riverside Geyser's afternoon eruption on 6 June 2018.
08 Aug 2017 @ 1845 JSJ https://www.flickr.com/photos/jsjgeology/35725848423 Photo (out of 6) of Riverside Geyser's 6:45 PM-onward eruption on 8 August 2017.
02 Jul 2016 @ 1244 JSJ https://www.youtube.com/watch?v=QiSiw1FbPF0 Video compilation of Riverside Geyser's 12:44 PM-onward eruption on 2 July 2016.
03 Jul 2016 @ 1540 JSJ https://www.flickr.com/photos/jsjgeology/28303442506 Photo (1 of 6) of Riverside Geyser's 3:40 PM-onward eruption on 3 July 2016.
02 Jul 2016 @ 1244 JSJ https://www.flickr.com/photos/jsjgeology/27721214383 Photo (1 of 2) of Riverside Geyser's 12:44 PM-onward eruption on 2 July 2016.
08 Jul 2014 @ 1600 JSJ https://www.flickr.com/photos/jsjgeology/15129110278 Photo (1 of 3) of Riverside Geyser erupting at 4:00 PM-onward on 8 July 2014.
04 Aug 2013 @ 1653 JSJ https://www.flickr.com/photos/jsjgeology/13923848943 Photo (first of many) of Riverside Geyser's 4:54 to 5:16 PM eruption on 4 August 2013.
31 May 2013 @ 1528 JSJ https://www.flickr.com/photos/jsjgeology/13923982114 Photo (first of many, plus videos) of Riverside Geyser's 3:28 to 3:49 PM eruption on 31 May 2013.
28 Sep 2015 @ 0428 td http://i57.tinypic.com/1426f41.jpg Riverside?
27 Apr 2015 @ 0709 td http://tinypic.com/m/inx2eh/3 Taken 4/27/15 at 07:14 MT
01 Jul 2009 @ 1145 Micah Kipple https://www.flickr.com/photos/fback2008/16380373861 Flickr
Baseline does not exist.