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Musselshell River near Roundup

Highest listed crest 14.78 ftFlood stage 10.0 ft70 crests since 1946

The Musselshell River near Roundup crested at major flood stage 9 times among the 70 crests the National Weather Service lists from 1946 to 2024. The highest, 14.78 ft on May 26, 2011, was major flooding, 4.78 feet above flood stage. 4 other gauges on the Musselshell River crested above flood stage within a week of it, 3 at their own highest listed crest.

The gauge

Highest listed crest
14.78 ft
May 26, 2011; 15,000 cubic feet per second
Flood stage
10.0 ft
Major flooding from 11.0 ft
Crests at major
9
4th of 93 gauges in Montana
Most recent flood crest
June 9, 2023
10.23 ft, minor flooding
Location
Musselshell County
Montana

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Musselshell River near Roundup
Flood stage (minor)10.01Jun 9, 2023Minimal or no property damage, but possibly some public threat
Moderate flood stage10.50—Some inundation of structures and roads near the stream
Major flood stage11.09Jun 1, 2018Extensive inundation of structures and roads

Every listed crest

70 crests from 1946 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Musselshell River near Roundup, 1946 to 2024 051015ft Flood stage 10.0 ftMajor 11.0 ft Jul 4, 1946: 4.08 ft, below flood stage; 1,310 cubic feet per secondMar 20, 1947: 4.76 ft, below flood stage; 1,800 cubic feet per secondJun 18, 1948: 11.00 ft, major flooding; 7,460 cubic feet per secondJun 19, 1950: 6.23 ft, below flood stage; 2,960 cubic feet per secondAug 30, 1951: 7.20 ft, below flood stage; 3,840 cubic feet per secondMay 29, 1952: 4.86 ft, below flood stage; 1,880 cubic feet per secondJun 16, 1953: 4.17 ft, below flood stage; 1,420 cubic feet per secondAug 5, 1954: 2.77 ft, below flood stage; 532 cubic feet per secondJul 20, 1955: 3.30 ft, below flood stage; 870 cubic feet per secondJun 22, 1957: 5.64 ft, below flood stage; 2,270 cubic feet per secondJul 19, 1958: 3.91 ft, below flood stage; 1,160 cubic feet per secondAug 1, 1961: 2.48 ft, below flood stage; 366 cubic feet per secondJun 10, 1964: 5.83 ft, below flood stage; 2,030 cubic feet per secondMay 14, 1966: 3.65 ft, below flood stage; 925 cubic feet per secondJun 18, 1967: 12.45 ft, major flooding; 9,610 cubic feet per secondMar 20, 1969: 9.35 ft, below flood stage; 2,300 cubic feet per secondMay 25, 1970: 6.34 ft, below flood stage; 1,780 cubic feet per secondFeb 13, 1971: 12.78 ft, major flooding; 3,000 cubic feet per secondJun 10, 1972: 6.95 ft, below flood stage; 2,160 cubic feet per secondAug 24, 1973: 4.37 ft, below flood stage; 738 cubic feet per secondJun 2, 1974: 4.29 ft, below flood stage; 738 cubic feet per secondJun 22, 1975: 12.89 ft, major flooding; 7,240 cubic feet per secondMay 7, 1976: 6.64 ft, below flood stage; 2,410 cubic feet per secondJun 21, 1977: 5.17 ft, below flood stage; 1,200 cubic feet per secondMar 23, 1978: 12.50 ft, major flooding; 7,520 cubic feet per secondJun 23, 1979: 9.13 ft, below flood stage; 4,480 cubic feet per secondJun 19, 1980: 5.89 ft, below flood stage; 2,260 cubic feet per secondMay 18, 1981: 9.52 ft, below flood stage; 4,810 cubic feet per secondJun 17, 1982: 7.05 ft, below flood stage; 3,030 cubic feet per secondJun 15, 1983: 3.15 ft, below flood stage; 532 cubic feet per secondMay 29, 1985: 2.16 ft, below flood stage; 265 cubic feet per secondFeb 27, 1986: 6.21 ft, below flood stage; 2,350 cubic feet per secondJul 19, 1987: 2.77 ft, below flood stage; 469 cubic feet per secondMay 10, 1988: 2.02 ft, below flood stage; 241 cubic feet per secondMar 28, 1989: 2.20 ft, below flood stage; 278 cubic feet per secondAug 20, 1990: 5.81 ft, below flood stage; 2,060 cubic feet per secondJun 8, 1991: 6.25 ft, below flood stage; 2,340 cubic feet per secondJun 19, 1992: 5.39 ft, below flood stage; 1,650 cubic feet per secondJul 28, 1993: 5.19 ft, below flood stage; 1,700 cubic feet per secondApr 28, 1994: 3.68 ft, below flood stage; 847 cubic feet per secondJun 10, 1995: 5.52 ft, below flood stage; 1,860 cubic feet per secondMay 30, 1996: 5.39 ft, below flood stage; 1,780 cubic feet per secondJun 14, 1997: 11.31 ft, major flooding; 6,500 cubic feet per secondJun 23, 1998: 3.86 ft, below flood stage; 784 cubic feet per secondJun 2, 1999: 3.54 ft, below flood stage; 661 cubic feet per secondJul 10, 2000: 2.40 ft, below flood stage; 311 cubic feet per secondJun 28, 2001: 2.84 ft, below flood stage; 510 cubic feet per secondJun 5, 2002: 2.48 ft, below flood stage; 342 cubic feet per secondJun 12, 2003: 2.91 ft, below flood stage; 554 cubic feet per secondJun 14, 2004: 2.47 ft, below flood stage; 338 cubic feet per secondJun 29, 2005: 4.71 ft, below flood stage; 971 cubic feet per secondJun 13, 2006: 3.20 ft, below flood stage; 657 cubic feet per secondMay 23, 2007: 2.71 ft, below flood stage; 469 cubic feet per secondMay 26, 2008: 4.28 ft, below flood stage; 954 cubic feet per secondJul 3, 2009: 3.60 ft, below flood stage; 673 cubic feet per secondJun 22, 2010: 5.07 ft, below flood stage; 1,330 cubic feet per secondMay 26, 2011: 14.78 ft, major flooding; 15,000 cubic feet per secondMay 30, 2012: 2.97 ft, below flood stage; 280 cubic feet per secondJun 3, 2013: 3.56 ft, below flood stage; 438 cubic feet per secondMar 10, 2014: 13.24 ft, major flooding; 11,000 cubic feet per secondJun 6, 2015: 6.57 ft, below flood stage; 2,480 cubic feet per secondJul 10, 2016: 2.12 ft, below flood stage; 260 cubic feet per secondFeb 11, 2017: 8.22 ft, below flood stage; 2,750 cubic feet per secondJun 1, 2018: 11.58 ft, major flooding; 7,320 cubic feet per secondMay 29, 2019: 8.18 ft, below flood stage; 3,890 cubic feet per secondMay 23, 2020: 5.94 ft, below flood stage; 1,580 cubic feet per secondJun 10, 2021: 2.94 ft, below flood stage; 360 cubic feet per secondJun 4, 2022: 2.94 ft, below flood stage; 390 cubic feet per secondJun 9, 2023: 10.23 ft, minor flooding; 3,900 cubic feet per secondFeb 25, 2024: 4.33 ft, below flood stage; 205 cubic feet per second Highest, 14.78 ft, May 26, 2011 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Musselshell River near Roundup 1940s: 1 1950s: 0 1960s: 1 1970s: 3 3 1980s: 0 1990s: 1 2000s: 0 2010s: 3 2020s: 1 1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

The 50 highest of 70 listed crests.

Highest listed crests, Musselshell River near Roundup
1May 26, 201114.78+4.78Major15,000
2Mar 10, 201413.24+3.24Major11,000
3Jun 22, 197512.89+2.89Major7,240
4Feb 13, 197112.78+2.78Major3,000
5Mar 23, 197812.50+2.50Major7,520
6Jun 18, 196712.45+2.45Major9,610
7Jun 1, 201811.58+1.58Major7,320
8Jun 14, 199711.31+1.31Major6,500
9Jun 18, 194811.00+1.00Major7,460
10Jun 9, 202310.23+0.23Minor3,900
11May 18, 19819.52−0.48Below flood stage4,810
12Mar 20, 19699.35−0.65Below flood stage2,300
13Jun 23, 19799.13−0.87Below flood stage4,480
14Feb 11, 20178.22−1.78Below flood stage2,750
15May 29, 20198.18−1.82Below flood stage3,890
16Aug 30, 19517.20−2.80Below flood stage3,840
17Jun 17, 19827.05−2.95Below flood stage3,030
18Jun 10, 19726.95−3.05Below flood stage2,160
19May 7, 19766.64−3.36Below flood stage2,410
20Jun 6, 20156.57−3.43Below flood stage2,480
21May 25, 19706.34−3.66Below flood stage1,780
22Jun 8, 19916.25−3.75Below flood stage2,340
23Jun 19, 19506.23−3.77Below flood stage2,960
24Feb 27, 19866.21−3.79Below flood stage2,350
25May 23, 20205.94−4.06Below flood stage1,580
26Jun 19, 19805.89−4.11Below flood stage2,260
27Jun 10, 19645.83−4.17Below flood stage2,030
28Aug 20, 19905.81−4.19Below flood stage2,060
29Jun 22, 19575.64−4.36Below flood stage2,270
30Jun 10, 19955.52−4.48Below flood stage1,860
31Jun 19, 19925.39−4.61Below flood stage1,650
32May 30, 19965.39−4.61Below flood stage1,780
33Jul 28, 19935.19−4.81Below flood stage1,700
34Jun 21, 19775.17−4.83Below flood stage1,200
35Jun 22, 20105.07−4.93Below flood stage1,330
36May 29, 19524.86−5.14Below flood stage1,880
37Mar 20, 19474.76−5.24Below flood stage1,800
38Jun 29, 20054.71−5.29Below flood stage971
39Aug 24, 19734.37−5.63Below flood stage738
40Feb 25, 20244.33−5.67Below flood stage205
41Jun 2, 19744.29−5.71Below flood stage738
42May 26, 20084.28−5.72Below flood stage954
43Jun 16, 19534.17−5.83Below flood stage1,420
44Jul 4, 19464.08−5.92Below flood stage1,310
45Jul 19, 19583.91−6.09Below flood stage1,160
46Jun 23, 19983.86−6.14Below flood stage784
47Apr 28, 19943.68−6.32Below flood stage847
48May 14, 19663.65−6.35Below flood stage925
49Jul 3, 20093.60−6.40Below flood stage673
50Jun 3, 20133.56−6.44Below flood stage438

The worst floods along the Musselshell River

For this gauge's highest crests, the other gauges on the Musselshell River that crested above flood stage within a week.

May 26, 2011: 14.78 ft here, major flooding

  • MosbyMT · May 23, 2011 · 16.00 ft · Major
  • MusselshellMT · May 27, 2011 · 13.23 ft · Major · its highest
  • HarlowtonMT · May 25, 2011 · 10.25 ft · Minor · its highest
  • ShawmutMT · May 26, 2011 · 9.27 ft · Minor · its highest

March 10, 2014: 13.24 ft here, major flooding

  • MusselshellMT · Mar 11, 2014 · 12.23 ft · Major
  • MosbyMT · Mar 12, 2014 · 11.35 ft · Minor
  • LavinaMT · Mar 10, 2014 · 10.47 ft · Minor
  • HarlowtonMT · Mar 7, 2014 · 9.84 ft · Minor

June 22, 1975: 12.89 ft here, major flooding

Gauges on the Musselshell River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Musselshell River
HarlowtonMT7.010.25 ft, May 25, 20110
ShawmutMT8.09.27 ft, May 26, 20110
LavinaMT9.511.15 ft, Jun 21, 20180
Roundup this gaugeMT10.014.78 ft, May 26, 20119
MusselshellMT11.013.23 ft, May 27, 20113
MosbyMT10.017.70 ft, Jul 27, 199310

Other gauges in Musselshell County

Flood gauges in Musselshell County
Musselshell11.013.23 ft, May 27, 20113

Musselshell County: every hazard · River floods across the country · Montana

NOAA National Water Prediction Service, gauge RUPM8, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.