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Musselshell River near Mosby

Highest listed crest 17.70 ftFlood stage 10.0 ft58 crests since 1964

The Musselshell River near Mosby crested at major flood stage 10 times among the 58 crests the National Weather Service lists from 1964 to 2025. The highest, 17.70 ft on July 27, 1993, was major flooding, 7.70 feet above flood stage.

The gauge

Highest listed crest
17.70 ft
July 27, 1993; 11,600 cubic feet per second
Flood stage
10.0 ft
Major flooding from 14.0 ft
Crests at major
10
2nd of 93 gauges in Montana
Most recent flood crest
February 25, 2025
10.28 ft, minor flooding
Location
Petroleum 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 Mosby
Action stage8.011Mar 20, 2019The level at which the NWS or its partners begin to take action
Flood stage (minor)10.014Feb 25, 2025Minimal or no property damage, but possibly some public threat
Moderate flood stage12.05May 11, 2011Some inundation of structures and roads near the stream
Major flood stage14.010Aug 25, 2014Extensive inundation of structures and roads

Every listed crest

58 crests from 1964 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Musselshell River near Mosby, 1964 to 2025 05101520ft Flood stage 10.0 ftMajor 14.0 ft Jun 21, 1964: 10.00 ft, minor flooding; 4,920 cubic feet per secondFeb 19, 1965: 15.17 ft, major floodingJun 16, 1965: 11.27 ft, minor flooding; 5,990 cubic feet per secondJun 18, 1967: 13.57 ft, moderate flooding; 11,900 cubic feet per secondJun 10, 1968: 12.05 ft, moderate flooding; 9,530 cubic feet per secondJul 7, 1969: 11.57 ft, minor flooding; 8,680 cubic feet per secondMay 12, 1970: 8.40 ft, action stage; 4,550 cubic feet per secondFeb 13, 1971: 14.51 ft, major flooding; 11,600 cubic feet per secondJun 9, 1972: 9.65 ft, action stage; 6,070 cubic feet per secondApr 26, 1973: 4.90 ft, below flood stage; 1,260 cubic feet per secondMay 21, 1974: 6.68 ft, below flood stage; 1,620 cubic feet per secondMay 7, 1975: 13.20 ft, moderate flooding; 11,600 cubic feet per secondMay 9, 1976: 6.57 ft, below flood stage; 2,300 cubic feet per secondJul 26, 1977: 6.25 ft, below flood stage; 1,960 cubic feet per secondMar 27, 1978: 14.10 ft, major flooding; 16,100 cubic feet per secondMar 12, 1979: 15.10 ft, major flooding; 13,000 cubic feet per secondMay 24, 1981: 9.45 ft, action stage; 5,680 cubic feet per secondFeb 16, 1982: 11.11 ft, minor floodingJan 9, 1984: 8.55 ft, action stageFeb 24, 1985: 7.15 ft, below flood stageSep 25, 1986: 14.02 ft, major flooding; 15,400 cubic feet per secondMay 28, 1987: 8.20 ft, action stage; 3,870 cubic feet per secondMay 8, 1988: 6.22 ft, below flood stage; 1,710 cubic feet per secondMar 9, 1989: 10.97 ft, minor floodingMay 25, 1990: 7.45 ft, below flood stage; 2,950 cubic feet per secondJun 10, 1991: 8.01 ft, action stage; 3,310 cubic feet per secondJun 16, 1992: 6.84 ft, below flood stage; 2,200 cubic feet per secondJul 27, 1993: 17.70 ft, major flooding; 11,600 cubic feet per secondMar 3, 1994: 14.83 ft, major flooding; 10,000 cubic feet per secondJun 11, 1995: 6.55 ft, below flood stage; 1,980 cubic feet per secondMay 25, 1996: 8.02 ft, action stage; 3,570 cubic feet per secondJun 18, 1997: 11.01 ft, minor flooding; 6,510 cubic feet per secondJun 17, 1998: 5.38 ft, below flood stage; 1,580 cubic feet per secondJan 12, 1999: 7.09 ft, below flood stageJun 14, 2001: 5.26 ft, below flood stage; 1,650 cubic feet per secondJun 22, 2002: 6.29 ft, below flood stage; 2,240 cubic feet per secondMar 15, 2003: 8.23 ft, action stageMar 9, 2004: 6.35 ft, below flood stageJun 29, 2005: 6.22 ft, below flood stage; 2,030 cubic feet per secondJan 22, 2006: 4.71 ft, below flood stageApr 7, 2006: 4.68 ft, below flood stage; 1,220 cubic feet per secondJun 1, 2007: 7.00 ft, below flood stage; 2,480 cubic feet per secondMay 25, 2008: 9.61 ft, action stage; 5,077 cubic feet per secondJun 18, 2010: 10.07 ft, minor floodingFeb 15, 2011: 13.37 ft, moderate floodingMar 12, 2011: 10.71 ft, minor floodingMay 11, 2011: 13.95 ft, moderate flooding; 9,840 cubic feet per secondMay 23, 2011: 16.00 ft, major flooding; 26,280 cubic feet per secondJun 10, 2011: 15.60 ft, major flooding; 23,911 cubic feet per secondJun 3, 2013: 11.72 ft, minor flooding; 6,891 cubic feet per secondMar 12, 2014: 11.35 ft, minor floodingAug 25, 2014: 14.36 ft, major flooding; 16,883 cubic feet per secondFeb 13, 2017: 9.49 ft, action stageMar 22, 2018: 11.52 ft, minor floodingJun 1, 2018: 11.11 ft, minor flooding; 9,042 cubic feet per secondMar 20, 2019: 9.93 ft, action stageJun 3, 2023: 11.71 ft, minor flooding; 13,172 cubic feet per secondFeb 25, 2025: 10.28 ft, minor flooding Highest, 17.70 ft, Jul 27, 1993 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Musselshell River near Mosby 1960s: 6 1970s: 4 1980s: 3 1990s: 3 2000s: 0 2010s: 11 11 2020s: 2 1960s1970s1980s1990s2000s2010s2020s
  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 58 listed crests.

Highest listed crests, Musselshell River near Mosby
1Jul 27, 199317.70+7.70Major11,600
2May 23, 201116.00+6.00Major26,280
3Jun 10, 201115.60+5.60Major23,911
4Feb 19, 196515.17+5.17Major—
5Mar 12, 197915.10+5.10Major13,000
6Mar 3, 199414.83+4.83Major10,000
7Feb 13, 197114.51+4.51Major11,600
8Aug 25, 201414.36+4.36Major16,883
9Mar 27, 197814.10+4.10Major16,100
10Sep 25, 198614.02+4.02Major15,400
11May 11, 201113.95+3.95Moderate9,840
12Jun 18, 196713.57+3.57Moderate11,900
13Feb 15, 201113.37+3.37Moderate—
14May 7, 197513.20+3.20Moderate11,600
15Jun 10, 196812.05+2.05Moderate9,530
16Jun 3, 201311.72+1.72Minor6,891
17Jun 3, 202311.71+1.71Minor13,172
18Jul 7, 196911.57+1.57Minor8,680
19Mar 22, 201811.52+1.52Minor—
20Mar 12, 201411.35+1.35Minor—
21Jun 16, 196511.27+1.27Minor5,990
22Feb 16, 198211.11+1.11Minor—
23Jun 1, 201811.11+1.11Minor9,042
24Jun 18, 199711.01+1.01Minor6,510
25Mar 9, 198910.97+0.97Minor—
26Mar 12, 201110.71+0.71Minor—
27Feb 25, 202510.28+0.28Minor—
28Jun 18, 201010.07+0.07Minor—
29Jun 21, 196410.000.00Minor4,920
30Mar 20, 20199.93−0.07Action—
31Jun 9, 19729.65−0.35Action6,070
32May 25, 20089.61−0.39Action5,077
33Feb 13, 20179.49−0.51Action—
34May 24, 19819.45−0.55Action5,680
35Jan 9, 19848.55−1.45Action—
36May 12, 19708.40−1.60Action4,550
37Mar 15, 20038.23−1.77Action—
38May 28, 19878.20−1.80Action3,870
39May 25, 19968.02−1.98Action3,570
40Jun 10, 19918.01−1.99Action3,310
41May 25, 19907.45−2.55Below flood stage2,950
42Feb 24, 19857.15−2.85Below flood stage—
43Jan 12, 19997.09−2.91Below flood stage—
44Jun 1, 20077.00−3.00Below flood stage2,480
45Jun 16, 19926.84−3.16Below flood stage2,200
46May 21, 19746.68−3.32Below flood stage1,620
47May 9, 19766.57−3.43Below flood stage2,300
48Jun 11, 19956.55−3.45Below flood stage1,980
49Mar 9, 20046.35−3.65Below flood stage—
50Jun 22, 20026.29−3.71Below flood stage2,240

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 23, 2011: 16.00 ft here, major flooding

  • RoundupMT · May 26, 2011 · 14.78 ft · Major · its highest
  • 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

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
RoundupMT10.014.78 ft, May 26, 20119
MusselshellMT11.013.23 ft, May 27, 20113
Mosby this gaugeMT10.017.70 ft, Jul 27, 199310

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

NOAA National Water Prediction Service, gauge MSBM8, 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.