Last Known Eruption
2h 24m ago
Predicted Next Eruption
Today at 1430 ± 25 minutes

Latest Eruptions

Eruption DurationInterval
20 Sep 2021 @ 0832 ie wc1d 13h 21m
18 Sep 2021 @ 1911 ie6h 16m
18 Sep 2021 @ 1255 ie6h 9m
18 Sep 2021 @ 06465h 59m
18 Sep 2021 @ 0047 wc6h 19m
17 Sep 2021 @ 18286h 20m
17 Sep 2021 @ 12086h 16m
17 Sep 2021 @ 0552 ie wc6h 18m
16 Sep 2021 @ 2334 wc6h 23m
16 Sep 2021 @ 1711 ns6h 19m
16 Sep 2021 @ 105220m 18h 50m
15 Sep 2021 @ 16026h 15m
15 Sep 2021 @ 0946:1918h 45m
14 Sep 2021 @ 1501 A5h 11m
14 Sep 2021 @ 095012h 43m
13 Sep 2021 @ 2107 wc6h 26m
13 Sep 2021 @ 14416h 20m
13 Sep 2021 @ 082112h 35m
12 Sep 2021 @ 1946 ie wc1d 1h 16m
11 Sep 2021 @ 1829:286h 21m
11 Sep 2021 @ 120818h 52m
10 Sep 2021 @ 17166h 11m
10 Sep 2021 @ 110518h 59m
09 Sep 2021 @ 16061d 1h 7m
08 Sep 2021 @ 14596h 20m
08 Sep 2021 @ 0839 wc12h 37m
07 Sep 2021 @ 2002 wc6h 3m
07 Sep 2021 @ 13596h 17m
07 Sep 2021 @ 074212h 40m
06 Sep 2021 @ 190220m 6h 16m
06 Sep 2021 @ 124620m 5h 43m
06 Sep 2021 @ 0703 ie12h 36m
05 Sep 2021 @ 18276h 16m
05 Sep 2021 @ 12116h 20m
05 Sep 2021 @ 0551 wc12h 42m
04 Sep 2021 @ 1708:0919m 29s 1d 1h 8m
03 Sep 2021 @ 1600 ie1d 7h 30m
02 Sep 2021 @ 0829:2312h 33m
01 Sep 2021 @ 1956 wc6h 4m
01 Sep 2021 @ 1351:386h 15m
01 Sep 2021 @ 0736 ns1d 47m
31 Aug 2021 @ 0649 ns wc12h 39m
30 Aug 2021 @ 18106h 3m
30 Aug 2021 @ 120718h 46m
29 Aug 2021 @ 17216h 7m
29 Aug 2021 @ 111418h 36m
28 Aug 2021 @ 16385h 54m
28 Aug 2021 @ 10446h 13m
28 Aug 2021 @ 0431 ns wc12h 20m
27 Aug 2021 @ 16116h 13m
27 Aug 2021 @ 095818h 29m
26 Aug 2021 @ 1529 ie wc6h 20m
26 Aug 2021 @ 09096h 1m
26 Aug 2021 @ 0308 ns wc12h 4m
25 Aug 2021 @ 15046h 14m
25 Aug 2021 @ 085018h 11m
24 Aug 2021 @ 14396h 21m
24 Aug 2021 @ 081812h 37m
23 Aug 2021 @ 19415h 0m
23 Aug 2021 @ 1441 ns5h 10m
23 Aug 2021 @ 09316h 14m
23 Aug 2021 @ 0317 ns wc6h 20m
22 Aug 2021 @ 2057 wc6h 8m
22 Aug 2021 @ 14496h 16m
22 Aug 2021 @ 08336h 18m
22 Aug 2021 @ 0215 wc6h 14m
21 Aug 2021 @ 20015h 50m
21 Aug 2021 @ 14116h 13m
21 Aug 2021 @ 0757:5118h 50m
20 Aug 2021 @ 13076h 10m
20 Aug 2021 @ 0656:596h 16m
20 Aug 2021 @ 0040 wc6h 17m
19 Aug 2021 @ 1823 ie wc6h 19m
19 Aug 2021 @ 12041d 19h 55m
17 Aug 2021 @ 16096h 14m
17 Aug 2021 @ 0954:4818h 32m
16 Aug 2021 @ 1522 ns6h 10m
16 Aug 2021 @ 0911:3612h 23m
15 Aug 2021 @ 20486h 6m
15 Aug 2021 @ 1442 ie6h 15m
15 Aug 2021 @ 0827 ie17h 21m
14 Aug 2021 @ 15065h 4m
14 Aug 2021 @ 100217h 26m
13 Aug 2021 @ 16366h 19m
13 Aug 2021 @ 101721m 18h 39m
12 Aug 2021 @ 15386h 8m
12 Aug 2021 @ 0929:1718h 45m
11 Aug 2021 @ 14446h 0m
11 Aug 2021 @ 084412h 27m
10 Aug 2021 @ 2017 ie6h 15m
10 Aug 2021 @ 14026h 13m
10 Aug 2021 @ 0748:5012h 36m
09 Aug 2021 @ 19126h 13m
09 Aug 2021 @ 1258:206h 21m 25s
09 Aug 2021 @ 0636:5517h 24m
08 Aug 2021 @ 1312 ie5h 4m
08 Aug 2021 @ 0808 ie12h 23m
07 Aug 2021 @ 19456h 17m
07 Aug 2021 @ 132818h 32m
06 Aug 2021 @ 1856 ie6h 14m

Interval Statistics

Interval Count100
Min5h 0m
Max1d 19h 55m
Mean10h 45m
Median6h 19m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
19632 17 Sep 2021 @ 0946 --- CrisG no overflow yet. no water visible in crater.
19600 16 Sep 2021 @ 1037 --- aferrara First splash in upper vent
19598 16 Sep 2021 @ 0955 16 Sep 2021 @ 1000 aferrara Keyhole started in this time range
19553 14 Sep 2021 @ 0717 --- CrisG not in overflow yet
19431 10 Sep 2021 @ 1425 --- RLJones Riverside is not in overflow. The sign is updated and is calling for an eruption at 1700 +\- 30
19235 01 Sep 2021 @ 1159 --- Barbara Lasseter Start of overflow
18955 18 Aug 2021 @ 0939 --- aferrara Bubbler behind main vent on.
18954 18 Aug 2021 @ 0925 --- aferrara In overflow, no bubbler
18873 09 Aug 2021 @ 0619 --- JimS Already in overflow.
18859 07 Aug 2021 @ 1211 --- aferrara In overflow, bubbler on.
18857 07 Aug 2021 @ 0815 --- Suzanne well past eruptive
18856 07 Aug 2021 @ 0605 --- JimS Already in overflow.
18845 06 Aug 2021 @ 0618 --- JimS Already in overflow.
18490 18 Jul 2021 @ 0535 --- SteveO In overflow
18338 10 Jul 2021 @ 0810 --- User34 Early overflow
18310 08 Jul 2021 @ 0836 --- JimS Start of overflow at 0836. Eruptions have been between 80 and 120 minutes from start of overflow. I recommend a prediction of 1010.
18236 02 Jul 2021 @ 0653 --- JimS Already in overflow at this time.
18215 01 Jul 2021 @ 0651 --- JimS Start of overflow. Eruptions have been about 80 to about 120 min after start of overflow. Suggest prediction of 0830.
18197 30 Jun 2021 @ 0723 --- JimS Overflow started 0723. Predict eruption at 0920.
18124 28 Jun 2021 @ 0640 --- JimS Overflow started about 0640. Predict eruption at about 0830.
18110 27 Jun 2021 @ 0605 --- JimS Start of overflow at 0605.
18098 26 Jun 2021 @ 0546 --- JimS Already in overflow at this time.
18080 25 Jun 2021 @ 0556 --- JimS In overflow.
18057 23 Jun 2021 @ 1134 --- JimS Overflow started at 1134.
18006 22 Jun 2021 @ 1108 --- K.Cooper Already in overflow
17935 20 Jun 2021 @ 0538 --- JimS Already in overflow.
17899 19 Jun 2021 @ 0553 --- JimS Already in overflow.
17888 18 Jun 2021 @ 1724 --- Art Already in overflow
17877 18 Jun 2021 @ 0548 --- JimS Already in overflow.
17850 16 Jun 2021 @ 1212 --- PamW In overflow when I walked up.
17335 01 Jun 2021 @ 1230 --- ge In overflow on arrival
17271 30 May 2021 @ 1529 --- Stephen_Gemar Another failed push. It stopped overflow for a few seconds.
17270 30 May 2021 @ 1525 --- Stephen_Gemar A failed push that stopped overflow for a few seconds.
17177 25 May 2021 @ 1643 --- User34 Another push and crash, no overflow for 90 seconds
17176 25 May 2021 @ 1625 --- User34 Huge push, afterwards overflow stopped for 1 1/2 to 2 minutes
16984 05 May 2021 @ 0927 --- mhvogel In overflow
16981 04 May 2021 @ 0858 --- nomadruss Riverside in overflow and broiling
16807 13 Jan 2021 @ 0942 --- mhvogel In overflow
16805 12 Jan 2021 @ 0956 --- mhvogel Riverside in overflow at 0956
16802 06 Jan 2021 @ 1003 --- mhvogel Currently in overflow.
16455 26 Oct 2020 @ 1426 --- nomadruss Beautiful eruption today.
16443 19 Oct 2020 @ 1156 --- am Not in overflow at this time
16425 14 Oct 2020 @ 1702 --- jonp In overflow
16415 12 Oct 2020 @ 0945 --- William in overflow, no water in back bubbler yet.
16328 04 Oct 2020 @ 1530 --- User34 Just below overflow
16244 24 Sep 2020 @ 1001 --- PamW In overflow
16239 23 Sep 2020 @ 1215 --- PamW An observer indicated Riverside had just finished.
15972 05 Sep 2020 @ 1132 --- jkgood In overflow & back vents on
15960 04 Sep 2020 @ 1855 --- William post eruptive, crater dry
15953 04 Sep 2020 @ 1209 --- TheHikingDude in overflow
15762 28 Aug 2020 @ 0930 28 Aug 2020 @ 0950 B**2 Start of overflow
15107 26 Jul 2020 @ 0805 --- William post eruptive, dry
14885 05 Jul 2020 @ 1224 --- William first observed splash from keyhole vent
14594 11 Jun 2020 @ 1036 --- William post eruptive, dry.
14162 03 Apr 2020 @ 1954 --- JarnoO (wc) Some steam appears to be originating from the Riverside area already, ~1h40m after the previous eruption.
14153 18 Mar 2020 @ 1907 --- JarnoO (wc) Some light steam appearing every so often from roughly its place (probably late ie). Interval until here (about 12h10m) would indicate a double interval assuming ~6h intervals.
14133 22 Feb 2020 @ 1032 --- Art In overflow
13969 24 Oct 2019 @ 1331 --- steve Riverside is in overflow
13859 03 Oct 2019 @ 1540 03 Oct 2019 @ 1728 underarockphoto BVS = back vent splash BVT = back bent thump I sat down at riverside at 15:40. It reached overflow at 15:45. The cone was totally dry so I’m assuming this was first overflow. I took notes of the following surges. The surges had increased boiling, and overflow, specifically enough to put water out over the lip of the cone behind and to the right of the main overflow channel. Surges noted as “+” indicate heavy overflow off the right ledge. “++” indicate overflow off all sides of the cone. 1545: overflow start 1610 1618 1624 1630 1635 1639 1644 1646 1647 1648 1648+ 1650 1652 1700 1703 1703 1704 1707 1707 1710++ BVT, BVS, heavy surging. Pool drained entirely for two minutes. 1712 1713 1716+ 1717+ 1718 1718 1719 1720 BVT 1721 1721+BVS 1725 1725+BVS 1728 1728++BVS 1728 Start
13858 03 Oct 2019 @ 1546 --- underarockphoto Overflow
13857 03 Oct 2019 @ 1542 --- underarockphoto Pool has filled crater and is blurping but has not hit overflow yet.
13674 13 Sep 2019 @ 0900 --- bhoppe Empty, quiet and no water visible. Possibly erupted round 730-8?
13587 06 Sep 2019 @ 0655 --- William empty crater.
13566 05 Sep 2019 @ 0840 --- AngelaT Overflow in process from Main Overflow Channel with splashing from Main Vent.
13323 20 Aug 2019 @ 1158 --- STS New NPS prediction of 17:45
13107 08 Aug 2019 @ 0825 --- AngelaT In overflow of with main vent splashing.
13024 04 Aug 2019 @ 1633 --- Stephen_Gemar Already in overflow, with decent play from the main vent.
12883 31 Jul 2019 @ 0955 --- rbwhitaker In overflow currently. (Did not see first overflow. Based on recent interval data, It's probably been in overflow for a while.)
12878 31 Jul 2019 @ 0815 --- adamdanski12 Mild to moderate overflow at this time with no splashing in any vents.
12862 29 Jul 2019 @ 0834 --- rbwhitaker Riverside went into overflow sometime between 816 and 834.
12834 28 Jul 2019 @ 0855 --- rbwhitaker Now in overflow. Don't know when it started
12830 28 Jul 2019 @ 0724 --- rbwhitaker Not in overflow yet
12819 27 Jul 2019 @ 0844 --- Minafuku In overflow when I arrived at 0844. Splashing in main vent is not sustained, hitting 6” to 18”. Keyhole splashing only to 6”. Posting a prediction of 0945 +/- 30.
12572 24 Jul 2019 @ 0800 --- dank Overflow and splashing in main vent
12487 14 Jul 2019 @ 2002 --- jazzknick Overflow well underway
12380 06 Jul 2019 @ 0848 --- Minafuku In overflow when I arrived at 0848
12087 03 Jul 2019 @ 0805 --- dank In overflow, light splashing in main vent
12055 01 Jul 2019 @ 0806 --- dank Steady overflow, splashing in main vent
11830 16 Jun 2019 @ 1342 --- Polly Post eruptive. Quietly steaming at 1342.
11740 12 Jun 2019 @ 0756 12 Jun 2019 @ 0806 dank Overflow and splashing in main vent, nothing in upper vent yet
11707 10 Jun 2019 @ 1614 --- Bhoffer Riverside is boiling and overflowing.
11704 10 Jun 2019 @ 1408 --- CrisG still no overflow
11701 10 Jun 2019 @ 1401 --- Bhoffer No action at riverside. Past prediction window.
11700 10 Jun 2019 @ 1300 --- Bhoffer Platform dry. Hardly any steam coming out of old vent.
11702 10 Jun 2019 @ 1250 --- CrisG no overflow. cone quietly steaming.
11598 06 Jun 2019 @ 0840 --- B**2 Definitely looks post eruption. Very Dry.
11574 04 Jun 2019 @ 1910 --- William in overflow
11179 06 May 2019 @ 0745 --- RLJones Start of overflow
11178 06 May 2019 @ 0657 --- RLJones Riverside is not in overflow
11149 03 May 2019 @ 1230 --- RLJones First overflow at 1230
11117 28 Apr 2019 @ 1933 --- ddshepard In overflow
11106 27 Apr 2019 @ 1251 --- rbwhitaker In overflow
10715 04 Nov 2018 @ 0805 --- jkgood In overflow
10661 24 Oct 2018 @ 1751 --- STS NPS prediction of 21:15
10560 05 Oct 2018 @ 0810 --- William No water visible in cone.
10342 22 Sep 2018 @ 0900 --- Minafuku Not in overflow as far as I can tell from the bike path...
10303 20 Sep 2018 @ 0807 --- STS NPS prediction of 0945
10057 06 Sep 2018 @ 1039 --- mswindle Not in overflow as of 1 hour ago, was in overflow as of 15 minutes ago. VC posting prediction of 1130.
9429 03 Aug 2018 @ 0958 --- rbwhitaker Currently in overflow
7874 23 Jan 2018 @ 0830 --- DaveM The two times posted (0315 and 0830) don't quite work. Both produced big steam clouds but the interval is too short.
EntrySourceLinkComment
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.