Last Known Eruption
4h 39m ago
Predicted Next Eruption
Today at 0452 ± 25 minutes

Latest Eruptions

Eruption DurationInterval
21 Feb 2024 @ 2252 wc6h 8m
21 Feb 2024 @ 1644 wc6h 5m
21 Feb 2024 @ 1039 ie wc11h 17m
20 Feb 2024 @ 2322 wc6h 32m
20 Feb 2024 @ 1650 wc6h 18m
20 Feb 2024 @ 1032 wc5h 57m
20 Feb 2024 @ 0435 wc6h 19m
19 Feb 2024 @ 2216 wc5h 25m
19 Feb 2024 @ 1651 wc6h 25m
19 Feb 2024 @ 1026 ns12h 59m
18 Feb 2024 @ 2127 wc6h 9m
18 Feb 2024 @ 1518 ie wc6h 27m
18 Feb 2024 @ 0851 ie wc11h 48m
17 Feb 2024 @ 2103 wc6h 26m
17 Feb 2024 @ 1437 ns wc6h 14m
17 Feb 2024 @ 0823 ie wc6h 11m
17 Feb 2024 @ 0212 wc6h 28m
16 Feb 2024 @ 1944 wc6h 28m
16 Feb 2024 @ 1316 wc18h 55m
15 Feb 2024 @ 1821 ie wc23h 50m
14 Feb 2024 @ 1831 wc6h 31m
14 Feb 2024 @ 1200 wc19h 23m
13 Feb 2024 @ 1637 wc6h 22m
13 Feb 2024 @ 101519h 29m
12 Feb 2024 @ 1446 wc6h 1m
12 Feb 2024 @ 0845 ie wc15h 45m
11 Feb 2024 @ 1700 wc6h 4m
11 Feb 2024 @ 105618h 54m
10 Feb 2024 @ 1602 ie wc1d 10m
09 Feb 2024 @ 1552 wc5h 47m
09 Feb 2024 @ 1005 ns wc5h 25m
09 Feb 2024 @ 0440 A12h 43m
08 Feb 2024 @ 1557 ie wc6h 41m
08 Feb 2024 @ 091616h 55m
07 Feb 2024 @ 1621 wc6h 13m
07 Feb 2024 @ 1008 ns17h 51m
06 Feb 2024 @ 1617 ie wc11h 22m
06 Feb 2024 @ 0455 A11h 13m
05 Feb 2024 @ 1742 ie wc5h 55m
05 Feb 2024 @ 1147 ? wc6h 32m
05 Feb 2024 @ 0515 A wc12h 39m
04 Feb 2024 @ 1636 ie wc6h 41m
04 Feb 2024 @ 0955 wc18h 33m
03 Feb 2024 @ 1522 wc5h 52m
03 Feb 2024 @ 0930 A19h 28m
02 Feb 2024 @ 1402 wc6h 5m
02 Feb 2024 @ 0757 ie wc17h 41m
01 Feb 2024 @ 1416 wc6h 22m
01 Feb 2024 @ 0754 wc6h 26m
01 Feb 2024 @ 0128 wc13h 3m
31 Jan 2024 @ 1225 A5h 49m
31 Jan 2024 @ 0636 wc17h 54m
30 Jan 2024 @ 1242~19m 6h 11m
30 Jan 2024 @ 0631 wc5h 10m
30 Jan 2024 @ 0121 wc11h 8m
29 Jan 2024 @ 1413 wc6h 10m
29 Jan 2024 @ 0803 ie wc5h 20m
29 Jan 2024 @ 0243 wc12h 34m
28 Jan 2024 @ 14096h 1m
28 Jan 2024 @ 0808 wc6h 21m
28 Jan 2024 @ 0147 wc12h 18m
27 Jan 2024 @ 1329 ie wc6h 19m
27 Jan 2024 @ 0710 wc6h 27m
27 Jan 2024 @ 0043 wc6h 28m
26 Jan 2024 @ 1815 wc6h 17m
26 Jan 2024 @ 1158 wc6h 36m
26 Jan 2024 @ 0522 wc6h 29m
25 Jan 2024 @ 2253 wc6h 23m
25 Jan 2024 @ 1630 ns wc6h 5m
25 Jan 2024 @ 1025 wc6h 25m
25 Jan 2024 @ 0400 wc6h 25m
24 Jan 2024 @ 2135 wc6h 9m
24 Jan 2024 @ 1526 wc5h 53m
24 Jan 2024 @ 0933 ie6h 36m
24 Jan 2024 @ 0257 wc6h 6m
23 Jan 2024 @ 2051 wc6h 15m
23 Jan 2024 @ 1436 wc5h 15m
23 Jan 2024 @ 0921 wc5h 20m
23 Jan 2024 @ 0401 wc6h 29m
22 Jan 2024 @ 2132 wc7h 32m
22 Jan 2024 @ 1400 A1d 30m
21 Jan 2024 @ 1330 A6h 25m
21 Jan 2024 @ 0705 A19h 13m
20 Jan 2024 @ 11524h 27m
20 Jan 2024 @ 0725 A19h 31m
19 Jan 2024 @ 1154 ns12h 59m
18 Jan 2024 @ 2255 wc6h 35m
18 Jan 2024 @ 16206h 31m
18 Jan 2024 @ 0949 ns6h 39m
18 Jan 2024 @ 0310 A13h 3m
17 Jan 2024 @ 14076h 24m
17 Jan 2024 @ 0743 ie wc12h 47m
16 Jan 2024 @ 1856 wc6h 26m
16 Jan 2024 @ 12306h 30m
16 Jan 2024 @ 0600 A wc12h 24m
15 Jan 2024 @ 1736 ie wc6h 34m
15 Jan 2024 @ 1102 ie wc6h 17m
15 Jan 2024 @ 0445 A1d 13h 26m
13 Jan 2024 @ 1519 wc6h 26m
13 Jan 2024 @ 0853 ns wc19h 43m

Interval Statistics

Interval Count100
Min4h 27m
Max1d 13h 26m
Mean9h 41m
Median6h 28m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
33891 20 Jan 2024 @ 0726 --- K.Cooper quiet
33788 14 Jan 2024 @ 1528 --- K.Cooper started overflow very recently
33786 14 Jan 2024 @ 1457 --- K.Cooper dry.
33025 18 Dec 2023 @ 1123 --- mhreed Empty. Erupted sometime before 1050.
33019 18 Dec 2023 @ 0918 --- mhvogel In overflow as I walked up.
32937 16 Dec 2023 @ 1015 --- aferrara Overflow, keyhole on
32847 15 Dec 2023 @ 0955 --- Pholli in overflow
29166 26 Oct 2023 @ 0942 --- nomadruss In overflow, not vigorous. I’d guess it will erupt around 10:30 so be watching for it.
29063 23 Oct 2023 @ 0951 23 Oct 2023 @ 0952 mhvogel Post eruptive. Heavy steam from both vents with no water.
28940 21 Oct 2023 @ 0750 --- User34 In overflow
28708 08 Oct 2023 @ 1523 --- Darcie In overflow
28526 28 Sep 2023 @ 0827 --- CraigC in overflow
28439 24 Sep 2023 @ 1025 --- CraigC started overflow within last 10 mins
28419 23 Sep 2023 @ 0830 --- CraigC started overflow within the last 10 mins
28361 20 Sep 2023 @ 1130 --- CraigC in overflow
28340 19 Sep 2023 @ 1015 --- MJL Overflow started 10:15.
28319 18 Sep 2023 @ 0850 --- Darcie Was not in overflow at 0845, but was at 0852
28221 11 Sep 2023 @ 1143 --- Darcie In overflow
28209 11 Sep 2023 @ 0915 --- Colin_W Quietly steaming. No overflow or splashing yet.
28193 10 Sep 2023 @ 1620 --- SantaFe108 In overflow.
28191 10 Sep 2023 @ 1546 --- Colin_W No overflow yet.
28115 08 Sep 2023 @ 1111 --- CP No steam phase.
28082 07 Sep 2023 @ 0938 --- CraigC overflow began
28050 06 Sep 2023 @ 0807 --- CraigC started overflow since check at 0800
27988 04 Sep 2023 @ 0655 --- SteveO In overflow.
27953 02 Sep 2023 @ 1630 --- SantaFe108 In overflow.
27865 30 Aug 2023 @ 1151 --- CraigC in overflow
27825 28 Aug 2023 @ 1059 --- CraigC in overflow already
27752 24 Aug 2023 @ 0936 --- RLJones Start of overflow
27718 22 Aug 2023 @ 0938 --- BrianR In overflow, was not in overflow half hour earlier per ranger
27708 21 Aug 2023 @ 0909 --- Colin_W Overflow with splashing in lower vent.
27487 10 Aug 2023 @ 0830 --- aferrara Dry, very weakly steaming
27379 02 Aug 2023 @ 0605 --- JimS Already in overflow
27349 30 Jul 2023 @ 2202 --- RMichaels Jetted water out of the top vent for a solid three minutes then quit without initiating the eruption. Afterward overflow completely stopped and Riverside fell silent. I've never seen Riverside behave this way before. Resumed overflow at 2225. Did not stay to see if this significantly delayed the eruption.
27130 20 Jul 2023 @ 0627 --- rbwhitaker in overflow
26704 28 Jun 2023 @ 0615 --- JimS Already in overflow
26691 27 Jun 2023 @ 0555 --- JimS Already in overflow
26392 17 Jun 2023 @ 0710 --- JimS Already in overflow
26332 15 Jun 2023 @ 0729 --- JimS Already in overflow
26255 12 Jun 2023 @ 0530 --- Darcie In overflow
26206 10 Jun 2023 @ 0631 --- JimS In overflow
26128 07 Jun 2023 @ 1547 --- SantaFe108 In overflow with good boiling.
26078 06 Jun 2023 @ 1000 --- Darcie Post-eruptive at 10:00, in overflow at 9:15
25999 04 Jun 2023 @ 0647 --- K.Cooper Large and 30s sustained 6ft surge from Upper vent. pool dropped.
25944 01 Jun 2023 @ 1220 --- ge 1st overflow
25942 01 Jun 2023 @ 0710 --- SteveO In overflow
25891 29 May 2023 @ 1420 29 May 2023 @ 1430 Tara Water burbling up in main vent. Occasional low whumping sounds from cone vent. Overflow resumed at 1429.
25890 29 May 2023 @ 1409 --- Tara Episode of huge splashes from upper/cone vent, height 5 to 15 feet above the cone and dumping water into the river. When this started the main/pool vent had strong overflow and was splashing to a foot, water level dropped pretty quickly and then all water disappeared. The epsidode lasted about 2 minutes, after which both vents were very quiet and showed no water.
25641 21 May 2023 @ 1002 --- Brando In overflow
25299 30 Apr 2023 @ 1645 --- SantaFe108 In overflow.
25215 23 Apr 2023 @ 0910 23 Apr 2023 @ 0925 aferrara Overflowing, but no keyhole vent yet
25073 05 Mar 2023 @ 1442 --- Colin_W No overflow
25070 04 Mar 2023 @ 1002 --- Colin_W In overflow with splashing
25040 27 Feb 2023 @ 1007 --- Colin_W Overflow and splashing
25025 20 Feb 2023 @ 1010 --- Colin_W In overflow with splashing.
24977 05 Feb 2023 @ 1054 --- Colin_W No splashing or overflow. Light steam from upper vent. Erupted earlier in the window.
24956 28 Jan 2023 @ 1546 --- Colin_W Steamy, no overflow. Post-eruption.
24437 18 Oct 2022 @ 1516 --- mwolf overflowing
24418 16 Oct 2022 @ 1240 --- User34 Trickling overflow, barely boiling from main vent
24365 14 Oct 2022 @ 1654 --- mwolf in overflow
23886 18 Sep 2022 @ 0729 --- RLJones riverside is in overflow. start time of overflow unknown
23876 17 Sep 2022 @ 1047 --- RLJones start of overflow
23851 16 Sep 2022 @ 0930 --- RLJones first overflow
23704 10 Sep 2022 @ 1150 --- BobInSLC in overflow
23409 26 Aug 2022 @ 0635 --- JimS Quiet.
23027 04 Aug 2022 @ 0940 --- dandersen In overflow
22847 26 Jul 2022 @ 0856 --- mhvogel In overflow
22691 19 Jul 2022 @ 1045 --- JimS Start of overflow at 1045.
22296 03 Jul 2022 @ 0746 --- JimS Already in overflow at this time.
22280 02 Jul 2022 @ 0708 --- EmilyW In overflow at this time
22253 01 Jul 2022 @ 0607 --- JimS Already in overflow at 0608
22189 29 Jun 2022 @ 0526 --- JimS Post eruptive at this time.
21873 09 Jun 2022 @ 1518 --- Forestbewithyou In overflow
21857 09 Jun 2022 @ 0825 --- RLJones In overflow at 0825, was not in overflow at 0740
21737 05 Jun 2022 @ 0820 --- Graham Gentle steam, post eruptive. 07xx report was Riverside, not F&M. Riverside had a very short interval, which it can do.
21679 03 Jun 2022 @ 0609 --- JimS Already in overflow.
21655 02 Jun 2022 @ 1018 --- JimS Start of overflow.
21630 01 Jun 2022 @ 0850 --- JimS Start of overflow.
21593 31 May 2022 @ 0700 --- JimS Overflow started at 0700.
21573 29 May 2022 @ 1411 --- aferrara Keyhole flipped off, off for about a minute
21472 25 May 2022 @ 0942 --- Colin_W Splashing in main vent and draining off to the side.
21337 17 May 2022 @ 1006 --- aferrara After >20 minutes of activity, keyhole turned off
21283 15 May 2022 @ 1326 --- aferrara First overflow
21282 15 May 2022 @ 1323 --- aferrara No overflow, no keyhole. Water just visible and boiling
21208 07 May 2022 @ 0939 --- Colin_W No pool or slashing. Steam gently wafting from both vents.
21162 04 May 2022 @ 0932 --- Colin_W Splashing in main vent and overflow.
21131 30 Apr 2022 @ 0936 --- Colin_W Splashing and overflow around the main cone.
20881 11 Mar 2022 @ 0925 --- aferrara Empty, lightly steam from both vents
20782 04 Feb 2022 @ 0924 --- aferrara keyhole on
20766 30 Jan 2022 @ 0941 --- aferrara Keyhole start
20704 16 Jan 2022 @ 0915 16 Jan 2022 @ 0940 aferrara Keyhole on, nothing from upper vent in this time.
20319 06 Nov 2021 @ 0859 --- aferrara In overflow
20235 31 Oct 2021 @ 0916 --- cb in overflow
20217 30 Oct 2021 @ 0952 --- Brando In overflow with boiling. Ranger prediction 10:30-10:45
20158 28 Oct 2021 @ 1355 --- DanS In overflow
20032 18 Oct 2021 @ 1013 --- cb in overflow
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
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.