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Saint Mary River at International boundary

Highest listed crest 13.46 ftFlood stage 7.5 ft46 crests since 1968

The Saint Mary River at International boundary crested at major flood stage 4 times among the 46 crests the National Weather Service lists from 1968 to 2022. The highest, 13.46 ft on June 21, 1975, was major flooding, 5.96 feet above flood stage.

The gauge

Highest listed crest
13.46 ft
June 21, 1975; 23,300 cubic feet per second
Flood stage
7.5 ft
Major flooding from 9.5 ft
Crests at major
4
11th of 93 gauges in Montana
Most recent flood crest
June 14, 2022
7.54 ft, minor flooding
Location
Glacier County
Montana

Flood stages

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

Flood categories, Saint Mary River at International boundary
Action stage6.514May 15, 2013The level at which the NWS or its partners begin to take action
Flood stage (minor)7.515Jun 14, 2022Minimal or no property damage, but possibly some public threat
Moderate flood stage8.51Jun 19, 2014Some inundation of structures and roads near the stream
Major flood stage9.54May 28, 2019Extensive inundation of structures and roads

Every listed crest

46 crests from 1968 to 2022. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Saint Mary River at International boundary, 1968 to 2022 468101214ft Flood stage 7.5 ftMajor 9.5 ft Jun 7, 1968: 6.82 ft, action stage; 2,520 cubic feet per secondJun 27, 1969: 7.87 ft, minor flooding; 4,140 cubic feet per secondJun 10, 1973: 6.78 ft, action stage; 2,560 cubic feet per secondJun 21, 1975: 13.46 ft, major flooding; 23,300 cubic feet per secondMay 13, 1976: 6.78 ft, action stage; 3,210 cubic feet per secondJun 9, 1977: 5.09 ft, below flood stage; 1,380 cubic feet per secondJun 10, 1978: 7.11 ft, action stage; 4,090 cubic feet per secondMay 28, 1979: 7.58 ft, minor flooding; 5,080 cubic feet per secondMay 26, 1980: 7.43 ft, action stage; 4,950 cubic feet per secondMay 22, 1981: 6.93 ft, action stage; 3,770 cubic feet per secondMay 28, 1982: 6.92 ft, action stage; 3,610 cubic feet per secondMay 31, 1983: 5.87 ft, below flood stage; 2,150 cubic feet per secondJun 29, 1984: 5.49 ft, below flood stage; 1,840 cubic feet per secondJun 10, 1985: 6.33 ft, below flood stage; 2,870 cubic feet per secondJun 1, 1986: 7.64 ft, minor flooding; 4,920 cubic feet per secondJul 23, 1987: 6.25 ft, below flood stage; 2,600 cubic feet per secondMay 14, 1988: 5.63 ft, below flood stage; 1,850 cubic feet per secondJun 11, 1989: 7.92 ft, minor flooding; 5,470 cubic feet per secondJun 27, 1990: 6.57 ft, action stage; 3,050 cubic feet per secondJun 21, 1991: 8.22 ft, minor flooding; 5,950 cubic feet per secondJun 15, 1992: 5.70 ft, below flood stage; 1,810 cubic feet per secondMay 20, 1993: 7.74 ft, minor flooding; 2,080 cubic feet per secondMay 20, 1994: 6.05 ft, below flood stage; 2,200 cubic feet per secondJun 7, 1995: 10.99 ft, major flooding; 15,200 cubic feet per secondJun 10, 1996: 7.79 ft, minor flooding; 4,540 cubic feet per secondJun 2, 1997: 8.29 ft, minor flooding; 5,650 cubic feet per secondJun 17, 1998: 6.85 ft, action stage; 3,060 cubic feet per secondJun 4, 1999: 6.52 ft, action stage; 2,620 cubic feet per secondNov 16, 1999: 6.52 ft, action stage; 3,160 cubic feet per secondJun 4, 2001: 5.68 ft, below flood stage; 2,120 cubic feet per secondJul 1, 2002: 8.30 ft, minor flooding; 7,240 cubic feet per secondMar 13, 2003: 9.96 ft, major floodingMay 31, 2003: 6.35 ft, below flood stage; 2,890 cubic feet per secondJun 7, 2004: 5.61 ft, below flood stage; 1,820 cubic feet per secondJun 3, 2005: 6.95 ft, action stage; 3,980 cubic feet per secondJun 18, 2006: 7.54 ft, minor flooding; 5,270 cubic feet per secondNov 9, 2006: 7.75 ft, minor flooding; 5,780 cubic feet per secondMay 26, 2008: 7.58 ft, minor flooding; 5,350 cubic feet per secondJun 1, 2009: 6.26 ft, below flood stage; 2,740 cubic feet per secondJun 17, 2010: 7.77 ft, minor flooding; 5,660 cubic feet per secondJun 9, 2011: 7.80 ft, minor flooding; 5,800 cubic feet per secondJun 27, 2012: 7.12 ft, action stage; 4,170 cubic feet per secondMay 15, 2013: 6.82 ft, action stage; 3,620 cubic feet per secondJun 19, 2014: 9.00 ft, moderate flooding; 9,500 cubic feet per secondMay 28, 2019: 12.02 ft, major flooding; 15,251 cubic feet per secondJun 14, 2022: 7.54 ft, minor flooding; 5,100 cubic feet per second Highest, 13.46 ft, Jun 21, 1975 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Saint Mary River at International boundary 1960s: 1 1970s: 2 1980s: 2 1990s: 5 5 2000s: 5 2010s: 4 2020s: 1 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.
  3. 8 crests measured on an earlier gauge datum are left out: 12.75 ft on Jun 5, 1908; 8.59 ft on Jun 20, 1965; 8.60 ft on Jun 4, 1966; 8.75 ft on May 30, 1967; 8.75 ft on Jun 13, 1970; 8.44 ft on May 31, 1971; and more.

Highest crests

Highest listed crests, Saint Mary River at International boundary
1Jun 21, 197513.46+5.96Major23,300
2May 28, 201912.02+4.52Major15,251
3Jun 7, 199510.99+3.49Major15,200
4Mar 13, 20039.96+2.46Major—
5Jun 19, 20149.00+1.50Moderate9,500
6Jul 1, 20028.30+0.80Minor7,240
7Jun 2, 19978.29+0.79Minor5,650
8Jun 21, 19918.22+0.72Minor5,950
9Jun 11, 19897.92+0.42Minor5,470
10Jun 27, 19697.87+0.37Minor4,140
11Jun 9, 20117.80+0.30Minor5,800
12Jun 10, 19967.79+0.29Minor4,540
13Jun 17, 20107.77+0.27Minor5,660
14Nov 9, 20067.75+0.25Minor5,780
15May 20, 19937.74+0.24Minor2,080
16Jun 1, 19867.64+0.14Minor4,920
17May 28, 19797.58+0.08Minor5,080
18May 26, 20087.58+0.08Minor5,350
19Jun 18, 20067.54+0.04Minor5,270
20Jun 14, 20227.54+0.04Minor5,100
21May 26, 19807.43−0.07Action4,950
22Jun 27, 20127.12−0.38Action4,170
23Jun 10, 19787.11−0.39Action4,090
24Jun 3, 20056.95−0.55Action3,980
25May 22, 19816.93−0.57Action3,770
26May 28, 19826.92−0.58Action3,610
27Jun 17, 19986.85−0.65Action3,060
28Jun 7, 19686.82−0.68Action2,520
29May 15, 20136.82−0.68Action3,620
30Jun 10, 19736.78−0.72Action2,560
31May 13, 19766.78−0.72Action3,210
32Jun 27, 19906.57−0.93Action3,050
33Jun 4, 19996.52−0.98Action2,620
34Nov 16, 19996.52−0.98Action3,160
35May 31, 20036.35−1.15Below flood stage2,890
36Jun 10, 19856.33−1.17Below flood stage2,870
37Jun 1, 20096.26−1.24Below flood stage2,740
38Jul 23, 19876.25−1.25Below flood stage2,600
39May 20, 19946.05−1.45Below flood stage2,200
40May 31, 19835.87−1.63Below flood stage2,150
41Jun 15, 19925.70−1.80Below flood stage1,810
42Jun 4, 20015.68−1.82Below flood stage2,120
43May 14, 19885.63−1.87Below flood stage1,850
44Jun 7, 20045.61−1.89Below flood stage1,820
45Jun 29, 19845.49−2.01Below flood stage1,840
46Jun 9, 19775.09−2.41Below flood stage1,380

Other gauges in Glacier County

Flood gauges in Glacier County
Four Horns Canal near Browning7.013.58 ft, Jun 19, 19750

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

NOAA National Water Prediction Service, gauge SMBM8, 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.