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Table of computed runoff by water-year for Montana
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Region

Year

Runoff
(mm)

Runoff
(in)

Rank

Percentile

MT

1901

121.44

4.78

81

34.68

MT

1902

127.40

5.02

70

43.55

MT

1903

167.89

6.61

22

82.26

MT

1904

159.18

6.27

31

75.00

MT

1905

108.16

4.26

101

18.55

MT

1906

113.03

4.45

91

26.61

MT

1907

184.44

7.26

8

93.55

MT

1908

189.49

7.46

5

95.97

MT

1909

178.88

7.04

13

89.52

MT

1910

158.52

6.24

32

74.19

MT

1911

156.23

6.15

36

70.97

MT

1912

162.02

6.38

26

79.03

MT

1913

163.16

6.42

24

80.65

MT

1914

128.80

5.07

69

44.35

MT

1915

135.60

5.34

58

53.23

MT

1916

201.14

7.92

2

98.39

MT

1917

180.68

7.11

11

91.13

MT

1918

157.25

6.19

33

73.39

MT

1919

108.96

4.29

99

20.16

MT

1920

144.38

5.68

46

62.90

MT

1921

151.01

5.95

37

70.16

MT

1922

143.54

5.65

48

61.29

MT

1923

146.42

5.76

43

65.32

MT

1924

144.26

5.68

47

62.10

MT

1925

182.06

7.17

9

92.74

MT

1926

109.88

4.33

97

21.77

MT

1927

197.00

7.76

3

97.58

MT

1928

172.77

6.80

19

84.68

MT

1929

118.01

4.65

85

31.45

MT

1930

107.65

4.24

103

16.94

MT

1931

79.10

3.11

121

2.42

MT

1932

118.76

4.68

83

33.06

MT

1933

140.53

5.53

53

57.26

MT

1934

140.80

5.54

52

58.06

MT

1935

106.50

4.19

105

15.32

MT

1936

98.12

3.86

113

8.87

MT

1937

82.77

3.26

119

4.03

MT

1938

123.46

4.86

78

37.10

MT

1939

107.96

4.25

102

17.74

MT

1940

82.88

3.26

118

4.84

MT

1941

76.90

3.03

122

1.61

MT

1942

132.56

5.22

63

49.19

MT

1943

173.08

6.81

18

85.48

MT

1944

106.33

4.19

106

14.52

MT

1945

110.98

4.37

94

24.19

MT

1946

125.72

4.95

72

41.94

MT

1947

162.99

6.42

25

79.84

MT

1948

181.54

7.15

10

91.94

MT

1949

123.56

4.86

77

37.90

MT

1950

161.26

6.35

27

78.23

MT

1951

177.00

6.97

15

87.90

MT

1952

150.44

5.92

39

68.55

MT

1953

138.55

5.45

54

56.45

MT

1954

148.62

5.85

42

66.13

MT

1955

131.60

5.18

66

46.77

MT

1956

156.65

6.17

35

71.77

MT

1957

133.61

5.26

61

50.81

MT

1958

117.10

4.61

87

29.84

MT

1959

159.22

6.27

30

75.81

MT

1960

135.28

5.33

59

52.42

MT

1961

111.15

4.38

93

25.00

MT

1962

137.13

5.40

57

54.03

MT

1963

125.99

4.96

71

42.74

MT

1964

150.96

5.94

38

69.35

MT

1965

179.95

7.08

12

90.32

MT

1966

122.72

4.83

79

36.29

MT

1967

164.83

6.49

23

81.45

MT

1968

141.58

5.57

50

59.68

MT

1969

160.60

6.32

28

77.42

MT

1970

149.31

5.88

40

67.74

MT

1971

177.12

6.97

14

88.71

MT

1972

176.74

6.96

16

87.10

MT

1973

103.46

4.07

108

12.90

MT

1974

172.36

6.79

20

83.87

MT

1975

174.79

6.88

17

86.29

MT

1976

170.79

6.72

21

83.06

MT

1977

80.91

3.19

120

3.23

MT

1978

148.88

5.86

41

66.94

MT

1979

125.41

4.94

74

40.32

MT

1980

110.78

4.36

95

23.39

MT

1981

133.27

5.25

62

50.00

MT

1982

146.19

5.76

44

64.52

MT

1983

119.69

4.71

82

33.87

MT

1984

125.67

4.95

73

41.13

MT

1985

107.15

4.22

104

16.13

MT

1986

133.67

5.26

60

51.61

MT

1987

95.34

3.75

114

8.06

MT

1988

83.42

3.28

117

5.65

MT

1989

110.09

4.33

96

22.58

MT

1990

129.33

5.09

67

45.97

MT

1991

140.88

5.55

51

58.87

MT

1992

88.64

3.49

116

6.45

MT

1993

116.43

4.58

89

28.23

MT

1994

99.39

3.91

111

10.48

MT

1995

124.68

4.91

75

39.52

MT

1996

185.63

7.31

7

94.35

MT

1997

195.83

7.71

4

96.77

MT

1998

129.14

5.08

68

45.16

MT

1999

132.52

5.22

64

48.39

MT

2000

106.02

4.17

107

13.71

MT

2001

73.47

2.89

123

0.81

MT

2002

111.41

4.39

92

25.81

MT

2003

98.70

3.89

112

9.68

MT

2004

90.48

3.56

115

7.26

MT

2005

101.94

4.01

109

12.10

MT

2006

117.56

4.63

86

30.65

MT

2007

108.86

4.29

100

19.35

MT

2008

132.12

5.20

65

47.58

MT

2009

124.65

4.91

76

38.71

MT

2010

116.48

4.59

88

29.03

MT

2011

215.37

8.48

1

99.19

MT

2012

142.12

5.60

49

60.48

MT

2013

118.28

4.66

84

32.26

MT

2014

156.82

6.17

34

72.58

MT

2015

114.37

4.50

90

27.42

MT

2016

101.72

4.00

110

11.29

MT

2017

160.41

6.32

29

76.61

MT

2018

187.60

7.39

6

95.16

MT

2019

137.48

5.41

56

54.84

MT

2020

145.26

5.72

45

63.71

MT

2021

109.74

4.32

98

20.97

MT

2022

138.50

5.45

55

55.65

MT

2023

122.72

4.83

80

35.48

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